MTN Prospectus Supplement

Money Market Yield

The following terms will generally apply to the medium-term senior and subordinated notes that we will sell from time to time using this prospectus supplement, the accompanying prospectus and any applicable pricing supplement, product supplement and/or other supplement. Citigroup will include information on the specific terms for each note in a pricing supplement, product supplement and/or other supplement (each of which we refer to as a “supplement”) to this prospectus supplement that Citigroup will deliver to prospective buyers of any note.

Investing in the notes involves risks. See “Risk Factors” beginning on page S-1 of this prospectus supplement.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these notes or determined if this prospectus supplement, the accompanying prospectus or any pricing supplement, product supplement or other supplement is truthful or complete. Any representation to the contrary is a criminal offense.

Our affiliate Citigroup Global Markets Inc. has agreed to use reasonable efforts to solicit offers to purchase these notes as our agent. The agent may also purchase these notes as principal at prices to be agreed upon at the time of sale. The agent may resell any notes it purchases as principal at a fixed public offering price, at prevailing market prices or at other prices, as the agent determines.

These notes are not deposits or savings accounts but are unsecured debt obligations of Citigroup Inc. These notes are not insured by the Federal Deposit Insurance Corporation or any other governmental agency or instrumentality.

We are responsible for the information contained in or incorporated by reference in this prospectus supplement, the accompanying prospectus, any other applicable supplement and in any related free writing prospectus that we prepare or authorize. We have not authorized anyone to provide you with any other information, and we take no responsibility for any other information that others may provide you. You should not assume that the information contained or incorporated by reference in this prospectus supplement or the accompanying prospectus is accurate as of any date other than the date of the applicable document. We are not making an offer of the notes in any state where the offer is not permitted.

References in this prospectus supplement to “Citigroup,” “we,” “our” or “us” are to Citigroup Inc., and not any of its subsidiaries, unless the context indicates otherwise.

Changes in Exchange Rates and Exchange Controls Could Result in a Substantial Loss to You.

An investment in foreign currency notes, which are notes denominated in a specified currency other than U.S. dollars, entails significant risks that are not associated with a similar investment in a security denominated in U.S. dollars. Similarly, an investment in an indexed note, on which all or a part of any payment due is based on one or more currencies other than U.S. dollars, has significant risks that are not associated with a similar investment in non-indexed notes. Such risks include, but are not limited to:

Such risks generally depend on factors over which Citigroup has no control and which cannot be readily foreseen, such as:

In recent years, exchange rates between the U.S. dollar and some foreign currencies in which Citigroup’s notes may be denominated, and between these foreign currencies and other foreign currencies, have been volatile. This volatility may be expected in the future. Fluctuations that have occurred in any particular exchange rate in the past are not necessarily indicative, however, of fluctuations that may occur in the exchange rate during the term of any foreign currency note. Depreciation of the specified currency of a foreign currency note against U.S. dollars may result in a decrease in the effective yield of such foreign currency note below its interest rate and could result in a substantial loss to the investor on a U.S. dollar basis.

Governments have imposed from time to time, and may in the future impose, exchange controls that could affect exchange rates as well as the availability of a specified currency other than U.S. dollars at the time of payment of principal of, or premium (if any) or interest on, a foreign currency note. There can be no assurance that exchange controls will not restrict or prohibit payments of principal, premium (if any) or interest or other amounts payable (if any) denominated in any such specified currency. Similarly, in the case of indexed notes and depending on the specific terms of the notes, fluctuations of the relevant underlying currencies could result in no return or in a substantial loss to the investor.

Even if there are no actual exchange controls, it is possible that such specified currency would not be available to Citigroup when payments on a note are due because of circumstances beyond the control of Citigroup. In this event, Citigroup will make required payments in U.S. dollars on the basis described in this prospectus supplement. You should consult your own financial and legal advisors as to the risks of an investment in notes denominated in a currency other than U.S. dollars. See “— The Unavailability of Currencies Could Result in a Substantial Loss to You” and “Description of the Notes — Payment of Principal and Interest on Non-U.S. Dollar Notes” below.

The information set forth in this prospectus supplement is directed to prospective purchasers of notes who are United States residents, except where otherwise expressly noted. We cannot advise prospective purchasers who are residents of countries other than the United States regarding any matters that may affect the purchase or holding of, or receipt of payments of principal, premium or interest on, notes. Such persons should consult their advisors with regard to these matters. Any applicable supplement relating to notes having a specified currency

other than U.S. dollars will contain a description of any material exchange controls affecting such currency and any other required information concerning such currency.

Except as set forth below, if payment on a note is required to be made in a specified currency other than U.S. dollars and such currency is —

then all payments on such note will be made in U.S. dollars until such currency is again available or so used. The amounts so payable on any date in such currency shall be converted into U.S. dollars on the basis of the most recently available market exchange rate for such currency or as otherwise indicated in the applicable supplement. Any payment on such note made under such circumstances in U.S. dollars will not constitute a default or an event of default under the indenture under which such note was issued.

Unless otherwise specified in the applicable pricing supplement, if the specified currency of a note is officially redenominated, such as by an official redenomination of any such specified currency that is a composite currency, then the payment obligations of Citigroup on such note will be the amount of redenominated currency that represents the amount of Citigroup’s obligations immediately before the redenomination. The notes will not provide for any adjustment to any amount payable under such notes as a result of:

For a description of the European Monetary Union, see “European Monetary Union” in the accompanying prospectus and any disclosure on the European Monetary Union in an applicable supplement.

Currently, there are limited facilities in the United States for conversion of U.S. dollars into foreign currencies, and vice versa. In addition, banks do not generally offer non-U.S. dollar-denominated checking or savings account facilities in the United States. Accordingly, payments on notes made in a currency other than U.S. dollars will be made from an account at a bank located outside the United States, unless otherwise specified in the applicable supplement.

The notes will be governed by, and construed in accordance with, the laws of New York State. Courts in the United States customarily have not rendered judgments for money damages denominated in any currency other than the U.S. dollar. A 1987 amendment to the Judiciary Law of New York State provides, however, that an action based upon an obligation denominated in a currency other than U.S. dollars will be rendered in the foreign currency of the underlying obligation. Any judgment awarded in such an action will be converted into U.S. dollars at the rate of exchange prevailing on the date of the entry of the judgment or decree.

Additional risks specific to particular notes will be detailed in the applicable pricing supplement, product supplement and/or other supplement.

Purchasers are required to pay for each note in a currency specified by Citigroup for such note. If requested by a prospective purchaser of a note having a specified currency other than U.S. dollars, Citigroup’s exchange rate agent may at its discretion arrange for the exchange of U.S. dollars into such specified currency to enable the purchaser to pay for such note. Each such exchange will be made by the exchange rate agent. The terms, conditions, limitations and charges that the exchange rate agent may from time to time establish in accordance with its regular foreign exchange practice shall control the exchange. The purchaser must pay all costs of exchange.

References in this prospectus supplement to “U.S. dollars,” “U.S.$,” “dollar” or “$” are to the lawful currency of the United States.

Certain statements in this prospectus supplement and the accompanying prospectus, and in other information incorporated by reference in this prospectus supplement and the accompanying prospectus, are forward-looking statements within the meaning of the rules and regulations of the SEC. Generally, forward-looking statements are not based on historical facts but instead represent only Citigroup’s and management’s belief regarding future events. Such statements may be identified by words such as believe, expect, anticipate, intend, estimate, may increase, may fluctuate, and similar expressions, or future or conditional verbs such as will, should, would and could.

Such statements are based on management’s current expectations and are subject to uncertainty and changes in circumstances. Actual results may differ materially from those included in these statements due to a variety of factors, including without limitation the precautionary statements included in this prospectus supplement and the accompanying prospectus, and the factors listed and described under “Risk Factors” in Citigroup’s most recent Annual Report on Form 10-K.

The following description of the particular terms of the Medium-Term Senior Notes, Series H and Medium-Term Subordinated Notes, Series H supplements the description of the general terms and provisions of the debt securities set forth in the accompanying prospectus. If any specific information regarding the notes in this prospectus supplement is inconsistent with the more general terms of the debt securities described in the accompanying prospectus, you should rely on the information in this prospectus supplement.

The applicable pricing supplement and any applicable product supplement or other supplement (each of which we refer to as a “supplement”) for each offering of notes will contain the specific information and terms for that offering. If any information in the applicable supplement, including any changes in the method of calculating interest on any note, is inconsistent with this prospectus supplement, you should rely on the information in the applicable supplement. The applicable supplement may also add, update or change information contained in the accompanying prospectus and this prospectus supplement. It is important for you to consider the information contained in the accompanying prospectus, this prospectus supplement and each other applicable supplement in making your investment decision.

The senior notes are a series of senior debt securities issued under Citigroup’s senior debt indenture. The subordinated notes are a series of subordinated debt securities issued under Citigroup’s subordinated debt indenture. You should review the accompanying prospectus for further information about Citigroup’s senior and subordinated indentures. The information in this section “Description of the Notes” supplements, and should be read together with, the information in the section “Description of Debt Securities” in the accompanying prospectus. Citigroup reserves the right to withdraw, cancel or modify the offer made by this prospectus supplement without notice.

Citigroup may from time to time offer indexed notes on which some or all interest payments, in the case of an indexed rate note, and/or the amount payable at stated maturity or earlier redemption or retirement, in the case of an indexed principal note, is determined based on the price or level of one or more equity securities, equity indices, commodities, commodity indices, currencies, interest rates or any other index or measure, or a basket of one or more of the foregoing, as specified in the applicable supplement (each, an “index”). Indexed principal notes will have a stated principal amount set forth in the applicable supplement. With respect to indexed principal notes, references to the payment of “principal” in this prospectus supplement or the accompanying prospectus (other than the “stated principal amount”) in the context of the amount payable at stated maturity or earlier redemption or repayment are to the amount payable on such note at stated maturity or earlier redemption or repayment, as specified in the applicable supplement, other than any interest payable at such time. Such amount may be greater than, equal to or less than the stated principal amount of such note at issuance.

A description of the index used in any determination of the payment at maturity or an interest payment, and the method or formula by which such payments will be determined based on such index, will be set forth in the applicable supplement.

If a fixed rate note, floating rate note or indexed rate note is also an indexed principal note, the amount of any interest payment will be determined based on the stated principal amount of such indexed note unless specified otherwise in connection with a particular offering of notes. If an indexed rate note is also an indexed principal note, the amount payable at stated maturity or any earlier redemption or repayment of the indexed note may be different from the stated principal amount.

Unless otherwise set forth in the applicable supplement, the regular record date for any interest payment date for an indexed note will be the business day immediately preceding the relevant interest payment date.

Unless otherwise specified in connection with a particular offering of notes, for the purpose of determining whether holders of the requisite principal amount of notes outstanding under the applicable indenture have made a demand or given a notice or waiver or taken any other action, the outstanding principal amount of indexed notes will be deemed to be the stated principal amount of such notes.

The interest rate on an indexed rate note will in no event be higher than the maximum rate permitted by applicable law. The notes will be governed by the law of the State of New York. As of the date of this prospectus supplement, the maximum rate of interest under provisions of the New York penal law, with a few exceptions, is 25% per annum on a simple interest basis. Such maximum rate of interest only applies to obligations that have an aggregate principal amount that is less than $2,500,000.

An investment in indexed notes has significant risks, including wide fluctuations in value prior to maturity and in the amounts of payments due, that are not associated with a similar investment in a conventional debt security. Such risks depend on a number of factors including supply and demand for the particular index (or the components of the index, as applicable) to which the note is linked and economic and political events over which Citigroup has no control. Fluctuations in the price or level of any index that have occurred in the past are not indicative of fluctuations that may occur during the term of any indexed notes.

Prospective investors should consult their own financial and legal advisors as to the risks of an investment in indexed notes.

The U.S. dollar equivalent of the public offering price or purchase price of a note having a specified currency other than U.S. dollars will be determined on the basis of the market exchange rate. Unless otherwise specified in connection with a particular offering of notes, this market exchange rate will be the noon buying rate in New York City for cable transfers in foreign currencies as certified for customs purposes by the Federal Reserve Bank of New York for such specified currency on the applicable issue date. Such determination will be made by Citigroup or its agent, as the exchange rate agent for the applicable offering of notes.

The applicable supplement for a note may provide that Citigroup will make one or more payments on such note in a currency other than U.S. dollars. If the applicable supplement provides for payment in a currency other than U.S. dollars and the note is held by DTC as a global security, Citigroup will, unless otherwise specified in the applicable supplement, arrange to convert all payments in respect of the note into U.S. dollars in the manner described in the following paragraph. The holder of such a note may, if stated in the applicable supplement, elect to receive all payments on the note in the specified currency by delivering a written notice to the fiscal agent and paying agent for such note not later than fifteen calendar days prior to the applicable payment date, except under the circumstances described below. Unless otherwise specified in the applicable supplement, such election will remain in effect until revoked by a written notice to the fiscal agent and paying agent that is received not later than fifteen calendar days prior to the applicable payment date. If an event of default has occurred or Citigroup has given notice of redemption of a note, no such change of election may be made.

Unless otherwise specified in connection with a particular offering of notes, the amount of any U.S. dollar payment on a note having a specified currency other than U.S. dollars that provides for payment in a currency other than U.S. dollars and that is held by DTC as a global security will be determined by the exchange rate agent:

The exchange rate agent will also determine prior to settlement the aggregate amount of the specified currency payable on a payment date for all notes denominated and payable in the specified currency. All currency exchange costs will be deducted from payments to the holders of the notes. If no such bid quotations are available, the payments will be made in the specified currency, unless the specified currency is unavailable due to the imposition of exchange controls or due to other circumstances beyond Citigroup’s control.

Except as set forth below, if payment on a note is required to be made in a specified currency other than U.S. dollars and such currency is —

If the specified currency of a note is officially redenominated, other than as a result of the European Monetary Union, such as by an official redenomination of any such specified currency that is a composite currency, then the payment obligations of Citigroup on such note will be the amount of redenominated currency that represents the amount of Citigroup’s obligations immediately before the redenomination. The notes will not provide for any adjustment to any amount payable under such notes as a result of:

For a description of the European Monetary Union, see “European Monetary Union” in the accompanying prospectus and any disclosure on the European Monetary Union in an applicable supplement.

Each note that has a specified currency of pounds sterling will mature in compliance with the regulations the Bank of England may promulgate from time to time.

If Citigroup issues notes which provide for one or more payments to be made in a non-U.S. currency, the applicable supplement may specify that such notes will be cleared through Euroclear Bank S.A./N.V. (“Euroclear”) and Clearstream Banking, société anonyme, Luxembourg (“Clearstream”), rather than through DTC. Such notes may be issued either under the New Safekeeping Structure (the “NSS”) or the Classic Safekeeping Structure (the “CSS”). Notes issued under the NSS will be registered in the name of a nominee of a common safekeeper for Euroclear and Clearstream. Notes issued under the CSS will be registered in the name of a nominee of a common depositary. Such common safekeeper or common depositary, as applicable, will be the depositary for such notes. The European Central Bank has announced that notes issued under the NSS will be in compliance with the “Standards for the use of EU securities settlement systems in ESCB credit operations” of the Eurosystem, provided that certain other criteria are fulfilled.

If such other eligibility criteria are fulfilled, notes issued under the NSS will be eligible to be pledged as collateral in Eurosystem operations (“Eurosystem eligible”). Notes issued under the CSS will not be Eurosystem eligible.

Each floating rate note will bear interest at the interest rate set forth, or otherwise described, in the applicable supplement. An interest period is the period from each interest reset date to, but not including, the following interest reset date; provided that the initial interest period is the period from the original issue date to, but not including, the first interest reset date. Unless otherwise specified in the applicable supplement, each interest payment date for a floating rate note will be an interest reset date for that note.

The interest rate for each floating rate note will be determined based on a simple per annum, interest rate basis and will be equal to, the base rate, plus or minus any spread, or multiplied by any spread multiplier. A basis point, or bp, equals one-hundredth of a percentage point. The spread is the number of basis points specified in the applicable supplement. The spread multiplier is the percentage specified in the applicable supplement. As described under “—Optional Reset Notes” below and “Description of Debt Securities — Extension of Maturity” in the accompanying prospectus, or as may otherwise be specified in the applicable supplement, the spread or spread multiplier on floating rate notes may be adjusted from time to time.

As specified in the applicable supplement, a floating rate note may have either or both of the following, which will be expressed as a rate per annum on a simple interest rate basis:

In addition to any maximum interest rate that may be applicable to any floating rate note, the interest rate on a floating rate note will in no event be higher than the maximum rate permitted by applicable law. The notes will be governed by the law of the State of New York. As of the date of this prospectus supplement, the maximum rate of interest under provisions of the New York penal law, with a few exceptions, is 25% per annum on a simple interest basis. Such maximum rate of interest only applies to obligations that have an aggregate principal amount that is less than $2,500,000.

The interest rate on each floating rate note will be reset on an interest reset date, which means that the interest rate is reset daily, weekly, monthly, quarterly, semiannually or annually, as specified in the applicable supplement.

Unless otherwise specified in the applicable supplement and except as set forth below, the rate of interest that goes into effect on any interest reset date will be determined on an interest determination date preceding such interest reset date, as further described below.

Unless otherwise specified in the applicable supplement, interest payable on floating rate notes will be the interest accrued from and including the original issue date or the last date to which interest has been paid, as the case may be, to but excluding the applicable interest payment date.

Accrued interest on a floating rate note with more than one interest reset date will be calculated by multiplying the principal amount of the note by an accrued interest factor. If the floating rate note is an indexed note, the stated principal amount of the note will be multiplied by the accrued interest factor. The accrued interest factor will be computed by adding the interest factors calculated for each day in the period for which accrued interest is being calculated. Unless otherwise specified in the applicable supplement, the interest factor for each such day will be computed by dividing the interest rate in effect on such day by 360, in the case of CD Rate notes, Commercial Paper Rate notes, Federal Funds Rate notes, LIBOR notes, Prime Rate notes, Eleventh District Cost of Funds Rate notes and EURIBOR notes. In the case of Treasury Rate notes, the interest factor for each such day will be computed by dividing such interest rate by the actual number of days in the year. The interest factor will be expressed as a decimal calculated to seven decimal places without rounding. For purposes of making the foregoing calculation, the interest rate in effect on any interest reset date will be the applicable rate as reset on such date.

For all other floating rate notes, accrued interest will be calculated by multiplying the principal amount of the note by the interest rate in effect during the period for which accrued interest is being calculated. That product is then multiplied by the quotient obtained by dividing the number of days in the period for which accrued interest is being calculated by 360, in the case of CD Rate notes, Commercial Paper Rate notes, Federal Funds Rate notes, LIBOR notes, Prime Rate notes, Eleventh District Cost of Funds Rate notes and EURIBOR notes. In the case of Treasury Rate notes, such product is multiplied by the quotient obtained by dividing the number of days in the period for which accrued interest is being calculated by the actual number of days in the year.

Upon the request of the holder of any floating rate note, the calculation agent for such note will provide the interest rate then in effect and, if determined, the interest rate that will become effective on the next interest reset date for such floating rate note.

In addition to the base rates listed in “Description of Debt Securities — Interest Rate Determination — Floating Rate Notes” in the accompanying prospectus, the applicable supplement may designate one of the following base rates as applicable to a floating rate note:

Terms used in this prospectus supplement and defined in “Description of Debt Securities – Interest Rate Determination — Floating Rate Notes” in the accompanying prospectus have the meanings given to them in the accompanying prospectus.

CD Rate Notes. Each CD Rate note will bear interest for each interest period at an interest rate equal to the CD Rate and any spread or spread multiplier specified in such note and in the applicable supplement.

The calculation agent will determine the CD Rate on each CD Rate determination date. The CD Rate determination date is the second business day prior to the interest reset date for each interest period for negotiable U.S. dollar certificates of deposit having the index maturity designated in the applicable supplement as published in H.15(519) opposite the caption “CDs (Secondary Market).”

The following procedures will be followed if the CD Rate cannot be determined as described above.

CD Rate notes, like other notes, are not deposit obligations of a bank and are not insured by the Federal Deposit Insurance Corporation.

Commercial Paper Rate Notes. Each Commercial Paper Rate note will bear interest for each interest period at an interest rate equal to the Commercial Paper Rate and any spread or spread multiplier, specified in the applicable supplement.

The calculation agent will determine the Commercial Paper Rate on each Commercial Paper Rate determination date. The Commercial Paper Rate determination date is the second business day immediately preceding the interest reset date for each interest period. The Commercial Paper Rate will be the money market yield on that date of the rate for commercial paper having the index maturity specified in the applicable supplement, as such rate published in H.15(519) opposite the heading “Commercial Paper — Nonfinancial.”

The following procedures will be followed if the Commercial Paper Rate cannot be determined as described above.

where “D” refers to the applicable per annum rate for commercial paper quoted on a bank discount basis and expressed as a decimal, and “M” refers to the actual number of days in the applicable interest period.

Federal Funds Rate Notes. Each Federal Funds Rate note will bear interest for each interest period at an interest rate equal to the Federal Funds Rate and any spread or spread multiplier specified in the applicable supplement.

The calculation agent will determine the Federal Funds Rate on each Federal Funds Rate determination date. The Federal Funds Rate determination date is the second business day immediately preceding the interest reset date for such interest period. The Federal Funds Rate will be the rate for U.S. dollar federal funds as published in H.15(519) opposite the caption “Federal Funds (Effective)” and displayed on Reuters 3000 Xtra Service (“Reuters”) (or any successor service) on Page FEDFUNDS1 or any other page as may replace such page on such service, which is commonly referred to as “Reuters page FEDFUNDS1” opposite the caption “EFFECT”.

The following procedures will be followed if the Federal Funds Rate cannot be determined as described above.

where “D” refers to the applicable per annum rate for treasury securities quoted on a bank discount basis and expressed as a decimal, “N” refers to 365 or 366, as the case may be, and “M” refers to the actual number of days in the applicable interest period.

Constant Maturity Treasury Rate Notes. Each Constant Maturity Treasury Rate note will bear interest for each interest period at an interest rate equal to the Treasury Rate and any spread or spread multiplier, specified in the applicable supplement.

If “Constant Maturity” is specified in the applicable supplement, the Treasury Rate for each interest period will be the percentage equal to the yield for United States Treasury securities at “constant maturity” having the CMT maturity index specified in the applicable supplement as the yield is displayed on Reuters (or any successor service) page FRBCMT (or any other page as may replace such page on such service) opposite the caption

“Treasury Constant Maturities” (“Reuters Page FRBCMT”) on the Constant Maturity Treasury Rate determination date.

If the Treasury Rate cannot be determined as indicated above, the following procedures will be followed in the order set forth below:

“Designated CMT maturity index” means the original period to maturity of the U.S. Treasury securities, either one, two, three, five, seven, ten, twenty or thirty years, specified in the applicable supplement for which the Treasury Rate will be calculated. If no such maturity is specified in the applicable supplement, the designated CMT maturity index will be two years.

The “Constant Maturity Treasury Rate determination date” will be the second business day prior to the interest reset date for the applicable interest period.

The CMT Rate for a Treasury security maturity as published as of any business day is intended to be indicative of the yield of a U.S. Treasury security having as of such business day a remaining term to maturity equivalent to such maturity. The CMT Rate as of any business day is based upon an interpolation by the U.S. Treasury of the daily yield curve of outstanding Treasury securities. This yield curve, which relates the yield on a security to its time to maturity, is based on the over-the-counter market bid yields on actively traded Treasury securities. Such yields are calculated from composites of quotations reported by leading U.S. government securities dealers, which may include one or more of the calculation agents or other affiliates of Citigroup. Certain constant maturity yield values are read from the yield curve. Such interpolation from the yield curve provides a theoretical yield for a Treasury security having ten years to maturity, for example, even if no outstanding Treasury security has as of such date exactly ten years remaining to maturity.

Eleventh District Cost of Funds Rate Notes. Eleventh District Cost of Funds Rate notes will bear interest at the interest rates, calculated based on the Eleventh District Cost of Funds Rate and any spread and/or spread multiplier, specified in the applicable supplement.

The calculation agent will determine the Eleventh District Cost of Funds Rate on each Eleventh District Cost of Funds Rate determination date. The Eleventh District Cost of Funds Rate determination date is the last working day of the month immediately prior to each interest reset date for each interest period on which the Federal Home Loan Bank of San Francisco publishes the Eleventh District Cost of Funds Index.

The Eleventh District Cost of Funds Rate will be the rate equal to the monthly weighted average cost of funds for the calendar month immediately preceding the month in which such Eleventh District Cost of Funds Rate determination date falls as set forth opposite the caption “11th District” on the display on Reuters (or any successor service) on page “COFI/ARMS” (or any other page as may replace such page on such service) (“Reuters Page COFI/ARMS”). Such page will be deemed to include any alternative successor page, determined by the calculation agent, as of 11:00 A.M., San Francisco time, on the Eleventh District Cost of Funds Rate determination date.

The following procedures will be followed if the Eleventh District Cost of Funds Rate cannot be determined as described above.

The “Eleventh District Cost of Funds Rate Index” will be the monthly weighted average cost of funds paid by member institutions of the Eleventh Federal Home Loan Bank District that the FHLB of San Francisco most recently announced as the cost of funds for the calendar month preceding the date of such announcement.

Inverse Floating Rate Notes. Any floating rate note may be designated in the applicable supplement as an inverse floating rate note. In such an event, unless otherwise specified in connection with a particular offering of notes, the interest rate on such floating rate note will be equal to:

However, on any inverse floating rate note, the interest rate will not be less than zero, unless otherwise specified in the applicable supplement.

The applicable supplement relating to a particular note may indicate that Citigroup has the option to reset the interest rate, or the spread, spread multiplier, or method of calculation, as the case may be, for such note. If Citigroup has the option to reset, the applicable supplement will also indicate the optional reset date or dates on which such interest rate or such spread, spread multiplier, or method of calculation, as the case may be, may be reset.

Citigroup shall notify the trustee whether or not it intends to exercise such option relating to such notes at least 45 but not more than 60 days prior to an optional reset date for such note. Not later than 40 days prior to such optional reset date, if global securities are held with DTC or any other clearing system, the trustee will provide notice as described in “Description of Debt Securities—Book-Entry Procedures and Settlement—Notices” in the accompanying prospectus, indicating whether Citigroup has elected to reset the interest rate, or the spread, spread multiplier or method of calculation, as the case may be.

If Citigroup elects to reset the interest rate, or the spread, spread multiplier or method of calculation, as the case may be, the trustee will provide notice in the manner described above indicating such new interest rate or such new spread, spread multiplier, or method of calculation, as the case may be. The notice will also indicate any provisions for redemption during the subsequent interest period. The subsequent interest period is the period from such optional reset date to the next optional reset date or, if there is no such next optional reset date, to the stated maturity of such note, including the date or dates on which or the period or periods during which and the price or prices at which such redemption may occur during such subsequent interest period.

Upon the transmittal by the trustee of a reset notice in the manner described above, such new interest rate or such new spread, spread multiplier, and/or method of calculation as the case may be, will take effect automatically. Except as modified by the reset notice and as described below, such note will have the same terms as prior to the transmittal of such reset notice.

Despite the foregoing, not later than 20 days prior to an optional reset date for a note, Citigroup may, at its option, revoke the interest rate, or the spread or spread multiplier, provided for in the reset notice relating to such optional reset date and establish a higher interest rate, or a higher spread or spread multiplier, as applicable, for the subsequent interest period commencing on such optional reset date.

Citigroup can make such revocations by causing the trustee for such note to provide notice of such higher interest rate or higher spread or spread multiplier, as the case may be, in the manner described above. Such notice shall be irrevocable. All notes for which the interest rate or spread or spread multiplier is reset on an optional

reset date will bear such higher interest rate, or higher spread or spread multiplier, as the case may be, whether or not tendered for repayment.

The holder of a note will have the option to elect repayment of such note by Citigroup on each optional reset date at a price equal to the principal amount of such note plus interest accrued to such optional reset date. In order for a note to be repaid on an optional reset date, the holder of such note must follow the procedures set forth below under “— Optional Redemption, Repayment and Repurchase” for optional repayment or in the applicable supplement. However, the period for delivery of such note or notification to the trustee for such note will be at least 25 but not more than 35 days prior to such optional reset date. Further, a holder who has tendered a note for repayment pursuant to a reset notice may, by written notice to the trustee for such note, revoke any such tender for repayment until the close of business on the tenth day prior to such optional reset date.

Citigroup may from time to time offer amortizing notes on which a portion or all of the principal amount is payable prior to stated maturity in accordance with a schedule, by application of a formula, or based on an index.

In the case of amortizing subordinated notes, once any scheduled payments of principal begin, all scheduled payments will be made at least annually and the amount repaid in each year will be no less than in the previous year. Further information concerning additional terms and conditions of any amortizing notes, including terms for repayment of such notes, will be set forth in the applicable supplement.

Unless otherwise specified in connection with a particular offering of notes, if the principal of any original issue discount note, or OID note, other than an indexed note, is declared to be due and payable immediately as a result of the acceleration of stated maturity, the amount of principal due and payable relating to the note will be limited to the aggregate principal amount of the note multiplied by the sum of (1) its issue price, expressed as a percentage of the aggregate principal amount, plus (2) the original issue discount amortized from the date of issue to the date of declaration. Amortization will be calculated using the interest method, computed in accordance with U.S. generally accepted accounting principles in effect on the date of declaration.

The applicable supplement may indicate that the holder of a senior note will have a survivor’s option, which is an option to elect repayment of such note prior to its stated maturity in the event of the death of the beneficial owner of such note. Citigroup will not issue any subordinated notes with a survivor’s option.

Pursuant to exercise of the survivor’s option, Citigroup will repay any note (or applicable portion of any note) properly tendered for repayment by the person, or on behalf of the person by a representative of such person, who has authority to act on behalf of the deceased beneficial owner of the note under the laws of the appropriate jurisdiction (including, without limitation, the personal representative, executor, surviving joint tenant or surviving tenant by the entirety of such deceased beneficial owner) at a price equal to the amortized principal amount thereof, subject to the following limitations.

Citigroup may, in its sole discretion, limit to $2,500,000 (or the approximate equivalent in other currencies) the aggregate principal amount of all notes for which exercises of the survivor’s option will be accepted in any calendar year. In the event that such limitation is applied, Citigroup may limit to $250,000 (or the approximate equivalent in other currencies) the aggregate principal amount of notes (or portions of notes) for which exercise of the survivor’s option will be accepted during a calendar year for any individual deceased beneficial owner of notes. Moreover, Citigroup will not make principal repayments due to exercise of the survivor’s option in amounts that are less than $5,000 (or the approximate equivalent in other currencies). In the event that the limitations described in the preceding sentences would result in the partial repayment of any note, the principal amount of such note remaining outstanding after repayment must be at least $5,000. Any note tendered due to exercise of the survivor’s option may be withdrawn by a written request of its holder received by the paying agent prior to its repayment.

The amortized principal amount of a note on any date shall be the amount equal to:

Each note that is tendered pursuant to valid exercise of the survivor’s option will be accepted promptly in the order all such notes are tendered, except for any note (or portion thereof) the acceptance of which, in the event Citigroup imposed either of the limits described in the preceding paragraph, would:

If at the end of any calendar year Citigroup has not imposed the annual limit, or if the aggregate principal amount of notes that have been accepted during that year due to exercise of the survivor’s option has not exceeded the annual limitation, Citigroup may accept notes from individual deceased owners in amounts that exceed the normal $250,000 per-person limit. In this case, Citigroup will accept notes or portions of notes exceeding the $250,000 limit in the order they were received, up to the annual limitation for such calendar year. Any note or portion of a note accepted for repayment due to the exercise of the survivor’s option will be repaid on the first interest payment due date that occurs 20 or more calendar days after the date of such acceptance. Each note (or any portion thereof) tendered for repayment that is not accepted in any calendar year due to the application of such annual limitation will be deemed to be tendered in the following calendar year in the order in which all such notes were originally tendered, unless any such note is withdrawn by its holder. If a note (or any portion thereof) that is tendered for repayment due to the valid exercise of the survivor’s option is not accepted, the paying agent will deliver to any affected representative a notice that states the reasons the note (or portion thereof) has not been accepted for repayment. As long as global securities are held with DTC or any other clearing system, the paying agent will provide notice as described in “Description of Debt Securities—Book-Entry Procedures and Settlement—Notices” in the accompanying prospectus.

Subject to the foregoing, in order for a survivor’s option to be validly exercised, the paying agent must receive:

If such note is represented by a global certificate, the depositary’s nominee will be the holder of such note and therefore will be the only entity that can exercise the survivor’s option for such note. To obtain repayment upon exercise of the survivor’s option for such a note, the representative must provide to the broker or other entity through which the deceased beneficial owner holds an interest in such note:

The broker or other entity will be responsible for disbursing to the appropriate representative any payments it receives due to exercise of the survivor’s option.

A representative may obtain more information regarding the survivor’s option from Citibank, N.A., the paying agent, at 388 Greenwich Street, 14th Floor, New York, New York 10013 (telephone 1-800-422-2066), during normal business hours.

Citigroup may from time to time offer renewable notes, which will mature on an initial maturity date. Such initial maturity date will be an interest payment date specified in the applicable supplement occurring in, or prior to, the twelfth month following the original issue date of such notes, unless the term of all or any portion of any such notes is renewed in accordance with the procedures described below.

The term of a renewable note may be extended to the interest payment date occurring in the twelfth month, or, if a special election interval is specified in the applicable supplement, the last month in a period equal to twice the special election interval elected by the holder after such renewal date. Such an extension may be made on the initial renewal date. That date will be the interest payment date occurring in the sixth month, unless a special election interval is specified in the applicable supplement, prior to the initial maturity date of a renewable note and on the interest payment date occurring in each sixth month, or in the last month of each special election interval, after such initial renewal date which, together with the initial renewal date, constitutes a renewal date.

If a holder does not elect to extend the term of any portion of the principal amount of a renewable note during the specified period prior to any renewal date, such portion will become due and payable on the new maturity date. Such new maturity date will be the interest payment date occurring in the sixth month, or the last month in the special election interval, after such renewal date.

A holder of a renewable note may elect to renew the term of such renewable note, or if so specified in the applicable supplement, any portion of such renewable note, by delivering a notice to such effect to the trustee or any duly appointed paying agent at the corporate trust office of the trustee or agency of the trustee in New York City. Such notice will be delivered not less than 15 nor more than 30 days prior to such renewal date, unless another period is specified in connection with a particular offering of notes, as the special election period. Such election will be irrevocable and will be binding upon each subsequent holder of such renewable note.

An election to renew the term of a renewable note may be exercised for less than the entire principal amount of such renewable note only if so specified in the applicable supplement and only in such principal amount, or any integral multiple in excess of such amount, that is specified in the applicable supplement. However, the term of the renewable notes may not be extended beyond the stated maturity specified for such renewable notes in the applicable supplement.

If the holder does not elect to renew the term, such renewable note must be presented to the trustee, or any duly appointed paying agent. The trustee, or any duly appointed paying agent, will issue in exchange for such note, in the name of such holder, a new note in a principal amount equal to the principal amount of such exchanged renewable note for which no election to renew such term was exercised, with terms identical to those specified on such renewable note. However, such note will have a fixed, nonrenewable stated maturity on the new maturity date.

If an election to renew is made for less than the full principal amount of a holder’s renewable note, the trustee, or any duly appointed paying agent, will issue in exchange for such note in the name of such holder, a replacement renewable note. The replacement renewable note will be in a principal amount equal to the principal amount elected to be renewed of such exchanged renewable note, with terms otherwise identical to such exchanged renewable note.

Unless otherwise specified in connection with a particular offering of debt securities, the notes will not be listed on any securities exchange. The section of the accompanying prospectus entitled “Description of Debt Securities — Listing” and other references to debt securities listed on the Luxembourg Stock Exchange in the accompanying prospectus do not apply to the notes, unless otherwise specified in the applicable supplement.

Unless otherwise specified in the applicable supplement, Citigroup will not be obligated to pay additional amounts to the beneficial owner of any notes that is a non-United States person, as described in the accompanying prospectus under “Description of Debt Securities — Payment of Additional Amounts.” Additionally, Citigroup will not have the right to redeem a series of notes for tax purposes as described in the accompanying prospectus under “Description of Debt Securities — Redemption for Tax Purposes,” unless otherwise specified in the applicable supplement.

If so specified in the applicable supplement, any note may be required to comply with all of the provisions, or any combination of the provisions, described herein or in the accompanying prospectus.

If so specified in the applicable supplement relating to a note, such note can be redeemed at the option of Citigroup, in whole or in part, prior to its stated maturity. If applicable, such supplement will also indicate (1) the optional redemption date or dates on which such note may be redeemed and (2) the redemption price at which such note may be redeemed on each such optional redemption date.

Unless otherwise specified in connection with a particular offering of notes, at least 30 days prior to the date of redemption, Citigroup will provide notice of such redemption to the trustee, and we or the trustee (at our request) will provide notice of such redemption to the holder of such note (which shall be the depositary for so long as the notes are held in book-entry form) in accordance with “Description of Debt Securities — Book Entry Procedures and Settlement — Notices” in the accompanying prospectus. Unless otherwise specified in connection with a particular offering of notes, Citigroup may exercise such option relating to a redemption of a note in part only by notifying the trustee for such note at least 45 days prior to any optional redemption date. In the event of redemption of a note in part only, a new note or notes for the unredeemed portion of such note or notes will be issued to the holder of such note or notes upon the cancellation of such note or notes. The

redemption of any subordinated note that is included in Citigroup’s capital may be subject to consultation with the Federal Reserve, which may not acquiesce in the redemption of such note unless it is satisfied that the capital position of Citigroup will be adequate after the proposed redemption.

If so specified in the applicable supplement relating to a note, the holder of such note will have the option to elect repayment of such note by Citigroup prior to its stated maturity. If applicable, such supplement will specify (1) the optional repayment date or dates on which such note may be repaid and (2) the optional repayment price at which such note may be repaid on each such optional repayment date.

Subject to the terms set forth in the applicable supplement, in order for a note to be repaid, the trustee must receive, at least 30 but not more than 45 days prior to an optional repayment date:

Any tender of a note by the holder for repayment, except pursuant to a reset notice or an extension notice, will be irrevocable. The repayment option may be exercised by the holder of a note for less than the entire principal amount of such note, provided, that the stated principal amount of such note remaining outstanding after repayment is an authorized denomination. Upon such partial repayment, such note will be canceled and a new note or notes for the remaining stated principal amount will be issued in the name of the holder of such repaid note.

If a note is represented by a global security, the depositary’s nominee will be the holder of such note and, therefore, will be the only entity that can exercise a right to repayment. In order to ensure that the depositary’s nominee will timely exercise a right to repayment relating to a particular note, the beneficial owner of such note must instruct the broker or other direct or indirect participant through which it holds an interest in such note to notify the depositary of its desire to exercise a right to repayment. Different firms have different cut-off times for accepting instructions from their customers. Accordingly, each beneficial owner should consult the broker or other direct or indirect participant through which it holds an interest in a note in order to ascertain the cut-off time by which such an instruction must be given in order for timely notice to be delivered to the depositary.

Except in the case of an optional redemption by Citigroup at a stated redemption price provided for in the applicable supplement, if Citigroup redeems or repays a note that is an OID note other than an indexed note prior to its stated maturity, then Citigroup will pay the amortized principal amount of the note as of the date of redemption or repayment regardless of anything else stated in this prospectus supplement or the accompanying prospectus.

These computations will be made in accordance with generally accepted United States bond yield computation principles. However, the amortized principal amount of a note will never exceed its principal amount. The bond yield to call listed in an applicable supplement will be computed on the basis of:

In the event that any such note is not redeemed on such first occurring optional redemption date, the bond yield to call that applies to such note will be recomputed on such optional redemption date on the basis of (1) the next occurring optional redemption date and (2) the amount payable on such optional redemption date. The bond yield to call will continue to be so recomputed on each succeeding optional redemption date until the note is so redeemed.

Citigroup or any of its subsidiaries may at any time purchase notes at any price in the open market or otherwise. Notes so purchased by Citigroup or any of its subsidiaries may, at the discretion of Citigroup, be held, resold or surrendered to the trustee for such notes for cancellation.

The defeasance provisions described in “Description of Debt Securities — Defeasance” in the accompanying prospectus will not apply to the notes, unless otherwise specified in the applicable supplement.

The following is a discussion of the material U.S. federal income and certain estate tax consequences of the ownership and disposition of the notes. It applies to you only if you hold the notes as capital assets within the meaning of Section 1221 of the Internal Revenue Code (the “Code”). It does not address all of the tax consequences that may be relevant to you in light of your particular circumstances or if you are a holder subject to special rules, such as:

If an entity that is classified as a partnership for U.S. federal income tax purposes holds notes, the U.S. federal income tax treatment of a partner will generally depend on the status of the partner and the activities of the partnership. If you are a partnership holding notes or a partner in such a partnership, you should consult your tax adviser as to the particular U.S. federal tax consequences of holding and disposing of notes.

This discussion is based on the Code, administrative pronouncements, judicial decisions and final, temporary and proposed Treasury regulations, all as of the date of this prospectus supplement, changes to any of which subsequent to the date of this prospectus supplement may affect the tax consequences described herein, possibly with retroactive effect. This discussion does not address the effects of any applicable state, local or foreign tax laws or the potential application of the Medicare Contribution tax. In addition, the discussion herein is subject to any further discussion contained in the applicable pricing supplement. You should consult your tax adviser concerning the application of U.S. federal income and estate tax laws to your particular situation (including the possibility of alternative treatments of the notes), as well as any tax consequences arising under the laws of any state, local or foreign jurisdictions.

This discussion applies to notes treated as debt instruments for U.S. federal income tax purposes. The U.S. federal income tax treatment of other notes will be addressed in the relevant supplement.

With respect to notes with a term of longer than one year (calculated as described below), the applicable supplement will specify whether we intend to treat these notes as “variable rate debt instruments” or as “contingent payment debt instruments” for U.S. federal income tax purposes.

This disclosure generally applies to notes that provide solely for payments in cash. Special tax consequences may apply to notes that provide for one or more payments in property other than cash, and those consequences will be addressed in the applicable supplement.

The discussion herein is subject to, and should be read in conjunction with, any discussion contained in the applicable supplement.

You are a “U.S. Holder” if, for U.S. federal income tax purposes, you are a beneficial owner of notes that is:

Stated interest on a note generally will be taxable to you as ordinary interest income at the time it accrues or is received in accordance with your method of accounting for U.S. federal income tax purposes.

Special rules governing the treatment of interest income on certain categories of notes are described below under “— Original Issue Discount,” “— Short-Term Notes,” “— Notes Treated as Variable Rate Debt Instruments,” “— Notes Treated as Contingent Payment Debt Instruments,” and “— Foreign Currency Notes.”

A note that has an “issue price” that is less than its “stated redemption price at maturity” will be considered to have been issued with original issue discount (“OID”) for U.S. federal income tax purposes (an “OID note”) unless the note satisfies a de minimis threshold under applicable Treasury regulations. Special rules governing the tax treatment of “short-term notes” and “contingent payment debt instruments” (which are not OID notes for purposes of this discussion) are described below under “—Short-Term Notes,” and “—Notes Treated as Contingent Payment Debt Instruments,” respectively. The “issue price” of a note will be the first price at which a substantial amount of the notes in an issue is sold to the public (not including sales to bond houses, brokers or similar persons or organizations acting in the capacity of underwriters, placement agents or wholesalers). The “stated redemption price at maturity” of a note generally will equal the sum of all payments required under the note other than payments of “qualified stated interest.” Qualified stated interest (“QSI”) generally includes stated interest unconditionally payable (other than in debt instruments of the issuer) at least annually at a single fixed rate, and also includes stated interest on certain floating-rate notes (as described under “—Notes Treated as Variable Rate Debt Instruments” below). If a note provides for more than one fixed rate of stated interest, interest payable at the lowest stated rate generally is QSI, with any excess included in the stated redemption price at maturity for purposes of determining whether the note was issued with OID.

If the difference between a note’s stated redemption price at maturity and its issue price is less than a de minimis amount as determined under applicable Treasury regulations, the note will not be treated as issued with OID and therefore will not be subject to the rules described below. If you hold notes with less than a de minimis amount of OID, you generally will include this OID in income, as capital gain, on a pro rata basis as principal payments are made on the note.

If you hold OID notes, you will be required to include any QSI in income when received or accrued, in accordance with your method of accounting for U.S. federal income tax purposes. In addition, you will be required to include OID in income as it accrues, in accordance with a constant-yield method based on a compounding of interest, regardless of your method of tax accounting.

You may make an election to include in gross income all interest that accrues on any note (including stated interest, OID, de minimis OID, market discount and de minimis market discount, as adjusted by any amortizable bond premium or acquisition premium as described below) in accordance with the constant-yield method based on the compounding of interest (a “constant-yield election”). This election may be revoked only with the consent of the Internal Revenue Service (the “IRS”).

A note that is subject to early redemption may be governed by rules that differ from the general rules described above for purposes of determining its yield and maturity (which may affect whether the note is treated as issued with OID and, if so, the timing of accrual of the OID). Under applicable Treasury regulations, we will generally be presumed to exercise an option to redeem a note if the exercise of the option would lower the yield on the note, and you will generally be presumed to exercise an option to require us to repurchase a note if the exercise of the option would increase the yield on the note. If such an option were not in fact exercised, the note would be treated, solely for purposes of calculating OID, as if it were redeemed and a new note were issued on the presumed exercise date for an amount equal to the note’s “adjusted issue price” on that date. A note’s

“adjusted issue price” is its issue price increased by the amount of previously includable OID and decreased by the amount of any prior payments on the note that do not constitute QSI.

If you purchase a note (other than a short-term note or CPDI) for an amount that is less than its stated redemption price at maturity or, in the case of an OID note, its adjusted issue price, the amount of the difference will be treated as market discount for U.S. federal income tax purposes, unless this difference is less than a specified de minimis amount.

You will be required to treat any principal payment (or, in the case of an OID note, any payment that does not constitute QSI) on, or any gain on the sale, exchange or retirement of, a note as ordinary income to the extent of the market discount accrued on the note at that time, unless this market discount has been previously included in income pursuant to an election to include market discount in income as it accrues (a “market discount accrual election”), or pursuant to the constant-yield election described under “— Original Issue Discount” above. If you dispose of a note in one of certain nontaxable transactions, accrued market discount will be includible as ordinary income as if you had sold the note in a taxable transaction at its then fair market value. Unless you make a market discount accrual election, you generally will be required to defer deductions for any interest paid on indebtedness incurred to purchase or carry the notes in an amount not exceeding the accrued market discount until the accrued market discount is included in income.

If you make a market discount accrual election, that election will apply to all market discount bonds acquired by you on or after the first day of the first taxable year to which that election applies. If you make a constant-yield election (as described under “— Original Issue Discount” above) with respect to a market discount note, that election will result in a deemed market discount accrual election for the taxable year in which you acquired the note and all succeeding years.

If you purchase an OID note for an amount that is greater than the note’s adjusted issue price but less than or equal to the sum of all amounts payable on the note after the purchase date, other than payments of QSI, you will be considered to have purchased the note with acquisition premium. Under the acquisition premium rules, the amount of OID that you must include in gross income with respect to the note for any taxable year will be reduced by the portion of acquisition premium properly allocable to that year.

If you purchase a note for an amount that is greater than the sum of all amounts payable on the note after the purchase date, other than payments of QSI, you generally will be considered to have purchased the note with amortizable bond premium equal to such excess. If the note is not optionally redeemable prior to its maturity date, you generally may elect to amortize this premium over the remaining term of the note using a constant-yield method. If, however, the note may be optionally redeemed prior to maturity after you have acquired it, the amount of amortizable bond premium is determined by substituting the redemption date for the maturity date and the redemption price for the amount payable at maturity but only if the substitution results in a smaller amount of premium attributable to the period before the redemption date. You may generally use the amortizable bond premium allocable to an accrual period to offset QSI required to be included in income with respect to the note in that accrual period. In addition, if you have purchased an OID note with amortizable bond premium, you will not be required to accrue any OID on such note. If you elect to amortize bond premium, you must reduce your tax basis in the note by the amount of the premium amortized in any year. An election to amortize bond premium applies to all taxable debt instruments then owned or thereafter acquired and may be revoked only with the consent of the IRS.

If you make a constant-yield election (as described under “— Original Issue Discount” above) for a note with amortizable bond premium, that election will result in a deemed election to amortize bond premium for all of your debt instruments with amortizable bond premium.

Upon the sale, exchange or retirement (including early redemption) of a note, you will recognize taxable gain or loss equal to the difference between the amount realized and your tax basis in the note. For this purpose, the amount realized does not include any amount attributable to accrued interest, which will be treated as described above under “— Payments of Interest.” Your tax basis in a note will equal its cost increased by the amounts of any OID and market discount you have previously accrued with respect to the note, if any, and decreased by any amortized premium and any principal payments you received prior to the sale, exchange or retirement of a note and by the amount of any other payments on the note that do not constitute QSI.

Gain or loss realized upon the sale or exchange of a note will be capital gain or loss and will be long-term capital gain or loss if you have held the note for more than one year. The deductibility of capital losses is subject to certain limitations. Exceptions to these general rules apply to short-term notes, notes with market discount, contingent payment debt instruments and foreign currency notes. See “— Market Discount” above, and “— Short-term Notes” and “— Notes Treated as Contingent Payment Debt Instruments” and “— Foreign Currency Notes” below.

The following discussion applies only to short-term notes, i.e., notes with a term of one year or less (from but excluding the settlement date to and including the last possible date that the notes could be outstanding pursuant to their terms). Generally, a short-term note is treated as issued at a discount equal to the sum of all payments required on the note minus its issue price.

If you are a cash-method U.S. Holder, you generally will not be required to recognize income with respect to a short-term note prior to maturity, other than with respect to the receipt of interest payments, if any, or pursuant to a sale or exchange of the note. If you are an accrual-method U.S. Holder (or a cash-method U.S. Holder who elects to accrue income on the note currently), you will be subject to rules that generally require accrual of discount on short-term notes on a straight-line basis, unless you elect a constant-yield method of accrual based on daily compounding. It is not clear whether or how any accrual should be determined prior to the relevant determination date(s) in respect of a contingent payment. You should consult your tax adviser regarding the amount and timing of any accruals on such notes.

Upon a sale, exchange or retirement of a short-term note, you will recognize gain or loss in an amount equal to any difference between the amount received and your tax basis in the note. Your tax basis in the note should equal the amount paid to acquire the note increased, if you accrue income on the notes currently, by any previously accrued but unpaid discount. The amount of any resulting loss generally will be treated as a short-term capital loss, the deductibility of which is subject to limitations. The excess of the amount received at maturity over your tax basis in the note generally should be treated as ordinary income. If you sell a short-term note providing for a contingent return at maturity prior to the time the contingent return has been fixed, it is not clear whether the gain you recognize should be treated as ordinary income, capital gain, or a combination of ordinary income and capital gain. You should consult your tax adviser regarding the treatment of short-term notes providing for contingent payments.

If you are a cash-method U.S. Holder, unless you make the election to accrue income currently on a short-term note, you will generally be required to defer deductions for interest paid on indebtedness incurred to purchase or carry the note in an amount not exceeding the accrued discount that you have not included in income. As discussed above, it is unclear whether or how accrual of discount should be determined prior to the relevant determination date(s) in respect of a contingent payment. If you make the election, that election will apply to all short-term notes acquired by you on or after the first day of the first taxable year to which that election applies. You should consult your tax adviser regarding these rules.

The following discussion applies only to floating-rate notes that are treated as variable rate debt instruments for U.S. federal income tax purposes (“VRDIs”).

Interest on VRDIs That Provide for a Single Variable Rate. Stated interest on a VRDI that provides for a single variable rate (a “Single Rate VRDI”) will be treated as QSI and will be taxable to you as ordinary interest income at the time it accrues or received, in accordance with your method of tax accounting. If the stated principal amount of a Single Rate VRDI exceeds its “issue price” by more than a specified de minimis amount, this excess will be treated as OID that you must include in income as it accrues in accordance with a constant-yield method based on compounding of interest before the receipt of cash payments attributable to this income (as described above under “— Original Issue Discount”). A VRDI that provides for stated interest at a fixed rate for an initial period of one year or less followed by a variable rate where the variable rate on the issue date is intended to approximate the fixed rate (which will be presumed if the value of the variable rate on the issue date does not differ from the value of the fixed rate by more than 0.25%) will be treated as a Single Rate VRDI.

Interest on VRDIs That Provide for Multiple Rates. We will refer to VRDIs that provide for (i) multiple variable rates or (ii) one or more variable rates and a single fixed rate as “Multiple Rate VRDIs.” Under applicable Treasury regulations, in order to determine the amount of QSI and OID in respect of Multiple Rate VRDIs, an equivalent fixed-rate debt instrument must be constructed. The equivalent fixed-rate debt instrument is constructed in the following manner: (i) first, if the Multiple Rate VRDI contains a fixed rate, that fixed rate is converted to a variable rate that preserves the fair market value of the note and (ii) second, each variable rate (including a variable rate determined under (i) above) is converted to a fixed rate substitute (which will generally be the value of that variable rate as of the issue date of the Multiple Rate VRDI) (the “equivalent fixed-rate debt instrument”). The rules discussed in “Original Issue Discount” are then applied to the equivalent fixed-rate debt instrument to determine the amount, if any, of OID and the timing of accrual of any OID. You will be required to include the OID in income for federal income tax purposes as it accrues, in accordance with a constant-yield method based on a compounding of interest, as described above under “— Original Issue Discount.” QSI on a Multiple Rate VRDI will generally be taxable to you as ordinary interest income at the time it accrues or is received, in accordance with your method of tax accounting. If a Multiple Rate VRDI is not issued with OID, all stated interest on the Multiple Rate VRDI will be treated as QSI.

If the amount you receive in a calendar year is greater than the interest assumed to be paid or accrued under the equivalent fixed-rate debt instrument, the excess is treated as additional QSI taxable to you as ordinary income. Otherwise, the difference will reduce the amount of QSI you are treated as receiving and will therefore reduce the amount of ordinary income you are required to take into income.

Sale or Other Disposition of a VRDI. Upon the sale or other taxable disposition of a VRDI, you generally will recognize capital gain or loss equal to the difference between the amount realized (other than amounts attributable to accrued QSI, which will be treated as described above) and your tax basis in the VRDI. Your tax basis in a VRDI will equal the amount you paid to purchase the VRDI, increased by the amounts of OID (if any) you previously included in income with respect to the VRDI and reduced by any payments other than QSI you received. Such gain or loss generally will be long-term capital gain or loss if you held the VRDI for more than one year at the time of disposition.

The following discussion applies only to notes that are treated as contingent payment debt instruments for U.S. federal income tax purposes (“CPDIs”).

We are required to determine a “comparable yield” for each issuance of CPDIs. The “comparable yield” is the yield at which we could issue a fixed-rate debt instrument with terms similar to those of the CPDIs, including the level of subordination, term, timing of payments and general market conditions, but excluding any adjustments for the riskiness of the contingencies or the liquidity of the CPDIs. Solely for purposes of determining the amount of interest income that you will be required to accrue, we are also required to construct a “projected payment schedule” in respect of the CPDIs representing a payment or a series of payments the amount and timing of which would produce a yield to maturity on the CPDIs equal to the comparable yield.

Neither the comparable yield nor the projected payment schedule constitutes a representation by us regarding the actual amounts that we will pay on the CPDIs.

For U.S. federal income tax purposes, you are required to use our determination of the comparable yield and projected payment schedule in determining interest accruals and adjustments in respect of the CPDIs, unless you timely disclose and justify the use of other estimates to the IRS. Regardless of your accounting method for U.S. federal income tax purposes, you will be required to accrue as interest income OID on the CPDIs at the comparable yield, adjusted upward or downward to reflect the difference, if any, between the actual and the projected payments on the CPDIs during the year (as described below).

You will be required for U.S. federal income tax purposes to accrue an amount of OID, for each accrual period prior to and including the maturity (or earlier sale, exchange or retirement) of a CPDI, that equals the product of (i) the “adjusted issue price” of the CPDI (as defined below) as of the beginning of the accrual period, (ii) the comparable yield of the CPDI, adjusted for the length of the accrual period and (iii) the number of days during the accrual period that you held the CPDI divided by the number of days in the accrual period. For U.S. federal income tax purposes, the adjusted issue price of a CPDI is its issue price increased by any interest income you have previously accrued (determined without regard to adjustments due to differences between projected and actual payments) and decreased by the projected amounts of any payments previously made on the CPDI.

In addition to interest accrued based upon the comparable yield as described above, you will be required to recognize interest income equal to the amount of any net positive adjustment (i.e., the excess of actual payments over projected payments) in respect of a CPDI for a taxable year. A net negative adjustment (i.e., the excess of projected payments over actual payments) in respect of a CPDI for a taxable year:

A net negative adjustment is not subject to the limitation imposed on miscellaneous itemized deductions under Section 67 of the Code. Any net negative adjustment in excess of the amounts described above may be carried forward to offset future interest income in respect of the CPDI or to reduce the amount realized on a sale, exchange or retirement of the CPDI.

If you purchase a CPDI for an amount that differs from its adjusted issue price, you should note that the general rules discussed above under “— Market Discount” and “— Acquisition Premium and Amortizable Bond Premium” do not apply. Instead, you must reasonably determine the extent to which the difference between the price you paid for the CPDI and its adjusted issue price is attributable to a change in expectations as to the projected payment schedule, a change in interest rates, or both, and allocate the difference accordingly.

If you purchase a CPDI for an amount that is less than its adjusted issue price, you must (i) make positive adjustments increasing the amount of interest you would otherwise accrue and include in income each year to the extent of amounts allocated to a change in interest rates as described above and/or (ii) make positive adjustments increasing the amount of ordinary income (or decreasing the amount of ordinary loss) that you would otherwise recognize upon the date of a projected payment to the extent of amounts allocated to a change in expectations as to the amount of that projected payment as described above. If you purchase a CPDI for an amount that is greater than its adjusted issue price, you must (i) make negative adjustments decreasing the amount of interest that you would otherwise accrue and include in income each year to the extent of amounts allocated to a change in interest rates as described above and/or (ii) make negative adjustments decreasing the amount of ordinary income (or increasing the amount of ordinary loss) that you would otherwise recognize upon the date of a projected payment to the extent of amounts allocated to a change in expectations as to the amount of that projected payment as described above. Adjustments allocated to the interest amount are made on the date the daily portion of interest accrues.

Upon a sale or exchange of a CPDI, you generally will recognize taxable income or loss equal to the difference between the amount received from the sale or exchange and your tax basis in the CPDI. Your tax basis in the CPDI will equal the cost thereof, increased by any interest income you have previously accrued (determined with regard to any adjustments made because you purchased the CPDI at more or less than its adjusted issue price but without regard to adjustments due to differences between projected and actual payments) and decreased by the projected amounts of any payments previously made on the CPDI. At maturity, you will be treated as receiving the projected amount for that date (reduced by any carryforward of a net negative adjustment), and any difference between the amount actually received and that projected amount will be treated as a positive or negative adjustment governed by the rules described above. You generally must treat any income as interest income and any loss as ordinary loss to the extent of previous interest inclusions (reduced by the total amount of net negative adjustments previously taken into account as ordinary losses), and the balance as capital loss. These losses are not subject to the limitation imposed on miscellaneous itemized deductions under Section 67 of the Code. The deductibility of capital losses, however, is subject to limitations. Additionally, if you recognize a loss above certain thresholds, you may be required to file a disclosure statement with the IRS. You should consult your tax adviser regarding this reporting obligation.

Special rules may apply if all the remaining payments on a CPDI become fixed substantially contemporaneously. For this purpose, payments will be treated as fixed if the remaining contingencies with respect to them are remote or incidental. Under these rules, you would be required to account for the difference between the originally projected payments and the fixed payments in a reasonable manner over the period to which the difference relates. In addition, you would be required to make adjustments to, among other things, your accrual periods and your tax basis in the CPDI. The character of any gain or loss on a sale or exchange of your CPDI also might be affected. If one or more (but not all) contingent payments on a CPDI became fixed more than six months prior to the relevant payment date(s), you would be required to account for the difference between the originally projected payment(s) and the fixed payment(s) on a present value basis. You should consult your tax adviser regarding the application of these rules.

General. The following discussion describes certain special rules applicable to a U.S. Holder of notes that are denominated in a specified currency other than the U.S. dollar or the payments of interest and principal on which are payable in (or determined by reference to) a specified currency other than the U.S. dollar, which we refer to as “foreign currency notes.” This discussion does not address currency-linked notes or foreign currency notes that provide for contingent payments or payments in or by reference to multiple currencies, which will be discussed in the relevant pricing supplement.

The rules applicable to notes that are denominated in a currency other than the U.S. dollar could require gain or loss realized upon the sale, exchange or retirement of the notes that is attributable to fluctuations in currency exchange rates (“foreign currency gain or loss”) to be recharacterized as ordinary income or loss. The rules applicable to foreign currency notes are complex, and their application may depend on your particular U.S. federal income tax situation. For example, various elections are available under these rules, and whether you should make any of these elections may depend on your particular U.S. federal income tax situation. You should consult your tax adviser regarding the U.S. federal income tax consequences of the ownership and disposition of foreign currency notes.

Payments of Interest on Foreign Currency Notes. If you use the cash method of accounting for U.S. federal income tax purposes and you receive a payment of QSI (or you receive proceeds from a sale, exchange or other disposition attributable to accrued interest) in a foreign currency with respect to a foreign currency note, you will be required to include in income the U.S. dollar value of the foreign currency payment, regardless of whether the payment is in fact converted to U.S. dollars at that time, and this U.S. dollar value will be your tax basis in the foreign currency received. A cash-method holder who receives a payment of QSI in U.S. dollars should include the amount of this payment in income upon receipt. To the extent that a cash-method holder is required to accrue OID on a foreign currency note, rules similar to the rules described in the following paragraph very generally will apply with respect to the foreign currency gain or loss.

If you use the accrual method of accounting for U.S. federal income tax purposes, you will be required to include in income the U.S. dollar value of the amount of interest income (including OID, but reduced by amortizable bond premium to the extent applicable) that has accrued and is otherwise required to be taken into account with respect to a foreign currency note during an accrual period. The U.S. dollar value of the accrued income will be determined by translating the income at an average rate of exchange for the accrual period or, with respect to an accrual period that spans two taxable years, at the average rate for the partial period within the taxable year. In addition to the interest income accrued as described above, you will recognize ordinary income or loss (which will not be treated as interest income or expense) with respect to accrued interest income on the date the interest payment or proceeds from the sale, exchange or other disposition attributable to accrued interest is actually received. The amount of ordinary income or loss recognized will equal the difference between the U.S. dollar value of the foreign currency payment received (determined based on a spot rate on the date the payment is received) in respect of the accrual period (or, where you receive U.S. dollars, the amount of the payment in respect of the accrual period) and the U.S. dollar value of interest income that has accrued during the accrual period (as determined above). You may elect to translate interest income (including OID) for an interest accrual period into U.S. dollars at the spot rate on the last day of the interest accrual period (or, in the case of a partial accrual period, the last day of the taxable year) or, if the date of receipt is within five business days of the last day of the interest accrual period, the spot rate on the date of receipt. You must apply this election consistently to all debt instruments from year to year and cannot change the election without the consent of the IRS.

Amortizable Bond Premium and Market Discount on Foreign Currency Notes. Amortizable bond premium and market discount (each as defined above) on a foreign currency note are determined in the relevant foreign currency. In general, accrued market discount is translated into U.S. dollars at the spot rate on the date of disposition of the foreign currency note. However, if you elect to include market discount in income currently, the amount of market discount will be determined for any accrual period in the relevant foreign currency and then translated into U.S. dollars on the basis of the average exchange rate during the accrual period. In that event, in addition to the income accrued as described above, you will recognize foreign currency gain or loss in accordance with the rules relating to accrued interest described above.

If you elect to amortize bond premium, amortizable bond premium taken into account on a current basis will reduce interest income (in the relevant foreign currency). You will realize foreign currency gain or loss with respect to amortized bond premium with respect to any period by treating that amortized bond premium in the same manner as a return of principal on the sale, exchange or retirement of a foreign currency note (as discussed below). Any foreign currency gain or loss will be ordinary income or loss, as described below. If the election is not made, any loss realized on the sale, exchange or retirement of a foreign currency note will be capital loss to the extent of the bond premium.

Tax Basis in Foreign Currency Notes. Your tax basis in a foreign currency note, or the amount of any subsequent adjustment to your tax basis, will be the U.S. dollar value of the foreign currency amount paid for the note, or of the foreign currency amount of the adjustment, determined on the date of the purchase or adjustment. If you purchase a foreign currency note with previously owned foreign currency, you will recognize ordinary income or loss in an amount equal to the difference, if any, between your tax basis in the foreign currency and the U.S. dollar fair market value of the foreign currency note on the date of purchase.

Sale, Exchange or Retirement of Foreign Currency Notes. Foreign currency gain or loss realized upon the sale, exchange or retirement of a foreign currency note will be ordinary income or loss, that is not treated as interest income or expense. The amount of foreign currency gain or loss generally will equal the difference between the U.S. dollar value of your purchase price (reduced by any bond premium previously amortized as described above) in the foreign currency of the note, (i) determined on the date the payment is received in exchange for the note or the note is disposed of, and (ii) determined on the date you acquired the note. Amounts attributable to accrued interest will be treated as interest as described above. Foreign currency gain or loss realized upon the sale, exchange or retirement of any foreign currency note will be recognized only to the extent of the total gain or loss realized on the sale, exchange or retirement of the foreign currency note. Any gain or loss realized in excess of the foreign currency gain or loss will be capital gain or loss (except to the extent of accrued market discount or, in the case of a short-term note, to the extent of any discount not previously included in your

income). If you recognize an ordinary loss upon a sale or other disposition of a foreign currency note above certain thresholds, you may be subject to certain reporting requirements.

If you are a cash-method taxpayer who buys or sells a foreign currency note that is traded on an established market, you will be required to translate units of foreign currency paid or received into U.S. dollars at the spot rate on the settlement date of the purchase or sale. Accordingly, no exchange gain or loss will result from currency fluctuations between the trade date and the settlement of the purchase or sale. If you are an accrual-method taxpayer, you may elect the same treatment for all purchases and sales of foreign currency obligations traded on established securities markets. This election cannot be changed without the consent of the IRS. You will have a tax basis in any foreign currency received on the sale, exchange or retirement of a foreign currency note equal to the U.S. dollar value of the foreign currency, determined at the time of sale, exchange or retirement. Any gain or loss on a sale or other disposition of foreign currency (including its exchange for U.S. dollars or its use to purchase foreign currency notes) will be ordinary income or loss.

This section applies only to Non-U.S. Holders. You are a “Non-U.S. Holder” if you are a beneficial owner of a note that is, for U.S. federal income tax purposes:

You are not a “Non-U.S. Holder” if you are (i) an individual who is present in the United States for 183 days or more in the taxable year of disposition and not otherwise a resident of the United States for U.S. federal income tax purposes or (ii) a former citizen or resident of the United States and certain conditions apply. If you are such a holder, you should consult your tax adviser regarding the U.S. federal tax consequences of an investment in the notes, including the issues discussed below, in light of your circumstances.

Subject to the discussion below regarding “FATCA” and Section 871(m), you generally will not be subject to U.S. federal withholding or income tax in respect of amounts paid to you on a note or received on the sale or exchange of a note, provided that: (i) income in respect of the note is not effectively connected with your conduct of a trade or business in the United States, and (ii) you provide an appropriate IRS Form W-8 certifying under penalties of perjury that you are not a United States person.

If you are engaged in a U.S. trade or business, and if income from the notes is effectively connected with your conduct of that trade or business (and, if required by an applicable income tax treaty, is attributable to a U.S. permanent establishment or fixed base maintained by you), you generally will be subject to regular U.S. federal income tax with respect to that income in the same manner as if you were a U.S. Holder. If you are such a holder and you are a corporation, you should also consider the potential application of a 30% (or lower treaty rate) branch profits tax.

Legislation enacted in 2010 commonly referred to as “FATCA” generally imposes a withholding tax of 30% on payments to certain foreign entities (including financial intermediaries) with respect to certain financial instruments, unless various U.S. information reporting and due diligence requirements (that are in addition to, and potentially significantly more onerous than, the requirement to deliver an IRS Form W-8) have been satisfied. Pursuant to recently published proposed Treasury regulations and guidance from the U.S. Treasury Department and the IRS, this legislation will apply to certain financial instruments issued after December 31, 2012. Furthermore, under certain transition rules, this legislation will apply to payments of interest and dividends (including payments to which Section 871(m) of the Code, as discussed below, applies) made after December 31, 2013 and to payments of gross proceeds of the sales of certain financial instruments made after December 31, 2016. If withholding applies to the notes, we will not be required to pay any additional amounts with respect to amounts withheld.

If a payment with respect to the notes is contingent on or determined by reference to a dividend from sources within the United States, it is possible, under recently proposed Treasury regulations, that Section 871(m) of the Code could apply to the notes. While significant aspects of the application of these regulations to the notes are uncertain, we or other paying agents may withhold (at a rate of 30%, subject to reduction under an applicable income tax treaty) on any payment with respect to the notes to the extent such payment is treated as contingent upon or determined by reference to a dividend from sources within the United States under these rules. If withholding applies to the notes, we will not be required to pay any additional amounts with respect to amounts withheld.

If you are an individual Non-U.S. Holder or an entity the property of which is potentially includible in such an individual’s gross estate for U.S. federal estate tax purposes (for example, a trust funded by such an individual and with respect to which the individual has retained certain interests or powers), you should note that, absent an applicable treaty benefit, a note that is treated as a debt obligation for U.S. federal estate tax purposes generally will be treated as U.S. situs property subject to U.S. federal estate tax if payments on the note, if received by the decedent at the time of death, would have been subject to U.S. federal withholding or income tax (even if the IRS Form W-8 certification requirement described above were satisfied, and not taking into account the elimination of such U.S. federal withholding tax due to the application of an income tax treaty). If you are such an individual or entity, you should consult your tax adviser regarding the U.S. federal estate tax consequences of investing in the notes.

Amounts paid on the notes, and the proceeds of a sale, exchange or other disposition of the notes, may be subject to information reporting and, if you fail to provide certain identifying information (such as an accurate taxpayer identification number, if you are a U.S. Holder) or meet certain other conditions, may also be subject to backup withholding at the rate specified in the Code. If you are a Non-U.S. Holder that provides an appropriate IRS Form W-8, you will generally establish an exemption from backup withholding. Amounts withheld under the backup withholding rules are not additional taxes and may be refunded or credited against your U.S. federal income tax liability, provided the relevant information is timely furnished to the IRS.

The notes are being offered on a continuous basis by Citigroup through Citigroup Global Markets Inc., as lead agent, and may be offered through additional or other agents named in the applicable supplement. The agent or agents participating in a particular offering of the notes and named in the applicable supplement are collectively referred to as the “agent.” The agent has agreed to use reasonable efforts to solicit orders to purchase notes. Citigroup will have the sole right to accept orders to purchase notes and may reject proposed purchases in whole or in part. The agent will also have the right to reject any proposed purchase in whole or in part. Citigroup reserves the right to withdraw, cancel or modify the offer made by this prospectus supplement, the accompanying prospectus or any other supplement without notice.

Unless otherwise specified in connection with a particular offering of notes, the agent, acting as principal, will purchase the aggregate stated principal amount of the notes offered at the public offering price stated in the applicable supplement less an underwriting discount stated in the applicable supplement. The agent may sell the notes to the public at the public offering price or to selected dealers, which may include affiliates of ours and/or the agent, at the public offering price less a selling concession described in the applicable supplement. If so specified in the applicable supplement, the agent may sell the notes to the public or to selected dealers at varying prices to be determined at the time of each sale, which may be at prevailing market prices, at prices related to such prevailing prices or at negotiated prices. After any initial public offering of notes to be resold to purchasers at a fixed public offering price, the public offering price and any concession or discount may be changed.

Citigroup reserves the right to sell notes directly to investors on its own behalf. No commission will be payable nor will a discount be allowed on any sales made directly by Citigroup.

Unless notes are issued upon the reopening of a prior offering of notes that were listed on an exchange, no note will have an established trading market when issued. Unless otherwise specified in connection with a particular offering of notes, the notes will not be listed on any securities exchange. The agent may make a market in the notes but is not obligated to do so. If the agent does make a market for a period of time, it may discontinue any market-making at any time without notice, at its sole discretion. There can be no assurance of the existence or liquidity of a secondary market for any notes.

Citigroup estimates that its printing, rating agency, trustees’ and legal fees and other expenses allocable to the offering of the notes, excluding underwriting discounts and commissions, will be approximately $4,500,000.

The agent may be deemed to be an underwriter within the meaning of the Securities Act of 1933. Citigroup has agreed to indemnify the agent against liabilities relating to material misstatements and omissions, or to contribute to payments that the agent may be required to make relating to these liabilities. Citigroup will reimburse the agent for customary legal and other expenses incurred by it in connection with the offer and sale of the notes.

Unless otherwise specified in connection with a particular offering of notes, payment of the purchase price of the notes will be required to be made in immediately available funds in New York City on the date of settlement.

Concurrently with the offering of notes through the agent as described in this prospectus supplement, Citigroup may issue other securities under the indentures referred to in the accompanying prospectus.

A portion of the net proceeds from the sale of indexed notes or floating rate notes may be used to hedge Citigroup’s obligations under the notes. Citigroup may hedge its obligations under the notes through an affiliate of Citigroup and Citigroup Global Markets Inc. or through unaffiliated counterparties, and such counterparties may profit from such expected hedging activity even if the value of the notes declines. This hedging activity could affect the level or price of the index or base rate to which such notes are linked and, therefore, the value of and your return on the notes. For more information, see the section “Use of Proceeds and Hedging” in the accompanying prospectus and the applicable Pricing Supplement.

Conflicts of Interest. Citigroup Global Markets Inc. and other broker-dealer subsidiaries of Citigroup, are members of the Financial Industry Regulatory Authority, Inc. (“FINRA”) and may participate in offerings of the notes. Accordingly, offerings of the notes in which Citigroup Global Markets Inc. or Citigroup’s other broker-dealer subsidiaries participate will conform with the requirements addressing conflicts of interest when distributing the securities of an affiliate set forth in FINRA Rule 5121. Neither Citigroup Global Markets Inc. nor any other broker-dealer subsidiary of Citigroup will sell notes to a discretionary account unless Citigroup Global Markets Inc. or such broker-dealer subsidiary has received specific written approval of the transaction from the account holder.

Any agent, underwriter or dealer that is not an affiliate of ours may presently or from time to time engage in business transactions with us, including extending loans to us.

This prospectus supplement, the accompanying prospectus and each other applicable supplement may be used by Citigroup Global Markets Inc. or other subsidiaries of Citigroup in connection with offers and sales of the notes offered by this prospectus supplement in market-making transactions at negotiated prices related to prevailing market prices at the time of sale. Citigroup Global Markets Inc. or these other subsidiaries may act as principal or agent in such transactions.

A prospectus in electronic format may be made available on the websites maintained by the agent or one or more other dealers. The agent and other dealers may agree to allocate a number of notes for sale to their online brokerage account holders. The agent and other dealers will allocate notes to the agent and dealers that may make Internet distributions on the same basis as other allocations. In addition, notes may be sold by the agent or other dealers to dealers who resell notes to online brokerage account holders.

The notes have not been and will not be registered with the Comissão de Valores Mobiliários (The Brazilian Securities Commission ) and may not be offered or sold in the Federative Republic of Brazil except in circumstances which do not constitute a public offering or distribution under Brazilian laws and regulations.

Pursuant to the Mexican Securities Market Law, the notes have not been, and will not be, registered with the Mexican National Registry of Securities and may not be offered or sold publicly in the United Mexican States.

If any notes are sold in Uruguay, the notes will be placed relying on a private placement (“oferta privada”) pursuant to section 2 of law 16,749. The notes are not and will not be registered with the Central Bank of Uruguay to be publicly offered in Uruguay. The notes do not qualify as an investment fund regulated by Uruguayan law 16,774, as amended.

The information contained in this prospectus supplement, the accompanying prospectus and any applicable pricing supplement, product supplement and/or other supplement has not been reviewed by the Comisión Nacional Supervisora de Empresas y Valores (Peru’s National Corporations and Securities Supervisory Commission or CONASEV). Neither the Regulations for Initial Offers and Sale of Securities (CONASEV Resolution 141-98-EF/94.10) nor the obligations regarding the information applicable to securities registered with the Registro Público del Mercado de Valores (Peruvian Stock Market Public Registry) apply to any notes offered in Peru.

The offshore notes are not governed by Bolivian legislation nor are they registered with or regulated by the Bolivian regulatory authorities.

The contents of this prospectus supplement, the accompanying prospectus and any applicable pricing supplement, product supplement and/or other supplement have not been reviewed by any regulatory authority in Hong Kong. Investors are advised to exercise caution in relation to the offer. If investors are in any doubt about any of the contents of this prospectus supplement, the accompanying prospectus and any applicable pricing supplement, product supplement and/or other supplement, they should obtain independent professional advice.

This offer is not being made in Hong Kong, by means of any document, other than (1) to persons whose ordinary business it is to buy or sell shares or debentures (whether as principal or agent); (2) to “professional investors” within the meaning of the Securities and Futures Ordinance (Cap. 571) of Hong Kong (the “SFO”) and any rules made under the SFO; or (3) in other circumstances which do not result in the document being a “prospectus” as defined in the Companies Ordinance (Cap. 32) of Hong Kong (the “CO”) or which do not constitute an offer to the public within the meaning of the CO.

There is no advertisement, invitation or document relating to the notes which is directed at, or the contents of which are likely to be accessed or read by, the public in Hong Kong (except if permitted to do so under the laws of Hong Kong) other than with respect to notes which are or are intended to be disposed of only to persons outside Hong Kong or only to the persons or in the circumstances described in the preceding paragraph.

This prospectus supplement, the accompanying prospectus and any applicable pricing supplement, product supplement and/or other supplement have not been registered as a prospectus with the Monetary Authority of Singapore under the Securities and Futures Act, Chapter 289 of the Singapore Statutes (the Securities and Futures Act). Accordingly, neither this prospectus supplement nor any other document or material in connection with the offer or sale, or invitation for subscription or purchase, of the notes may be circulated or distributed, nor may the notes be offered or sold, or be made the subject of an invitation for subscription or purchase, whether directly or indirectly, to the public or any member of the public in Singapore other than in circumstances where the registration of a prospectus is not required and thus only (1) to an institutional investor or other person falling within section 274 of the Securities and Futures Act, (2) to a relevant person (as defined in section 275 of the Securities and Futures Act) or to any person pursuant to section 275(1A) of the Securities and Futures Act and in accordance with the conditions specified in section 275 of that Act, or (3) pursuant to, and in accordance with the conditions of, any other applicable provision of the Securities and Futures Act. No person receiving a copy of this prospectus supplement, the accompanying prospectus and any applicable pricing supplement, product supplement and/or other supplement may treat the same as constituting any invitation to him/her, unless in the relevant territory such an invitation could be lawfully made to him/her without compliance with any registration or other legal requirements or where such registration or other legal requirements have been complied with. Each of the following relevant persons specified in Section 275 of the Securities and Futures Act who has subscribed for or purchased the notes, namely a person who is:

should note that securities of that corporation or the beneficiaries’ rights and interest in that trust may not be transferred for 6 months after that corporation or that trust has acquired the notes under Section 275 of the Securities and Futures Act pursuant to an offer made in reliance on an exemption under Section 275 of the Securities and Futures Act unless (i) the transfer is made only to institutional investors, or relevant persons as defined in Section 275(2) of that Act, or arises from an offer referred to in Section 275(1A) of that Act (in the case of a corporation) or in accordance with Section 276(4)(i)(B) of that Act (in the case of a trust); (ii) no consideration is or will be given for the transfer; or (iii) the transfer is by operation of law.

A fiduciary of a pension, profit-sharing or other employee benefit plan subject to the Employee Retirement Income Security Act of 1974, as amended (“ERISA”), including entities such as collective investment funds, partnerships and separate accounts whose underlying assets include the assets of such plans (collectively, “ERISA Plans”), should consider the fiduciary standards of ERISA in the context of the ERISA Plan’s particular circumstances before authorizing an investment in the notes. Among other factors, the fiduciary should consider whether the investment would satisfy the prudence and diversification requirements of ERISA and would be consistent with the documents and instruments governing the ERISA Plan.

Section 406 of ERISA and Section 4975 of the Internal Revenue Code of 1986, as amended, (the “Code”) prohibit ERISA Plans, as well as plans (including individual retirement accounts and Keogh plans) subject to Section 4975 of the Code (together with ERISA Plans, “Plans”), from engaging in certain transactions involving the “plan assets” with persons who are “parties in interest” under ERISA or “disqualified persons” under Section 4975 of the Code (in either case, “Parties in Interest”) with respect to such Plans. As a result of our business, we, and our current and future affiliates, may be Parties in Interest with respect to many Plans. Where we (or our affiliate) are a Party in Interest with respect to a Plan (either directly or by reason of our ownership interests in our directly or indirectly owned subsidiaries), the purchase and holding of the notes by or on behalf of the Plan could be a prohibited transaction under Section 406 of ERISA and/or Section 4975 of the Code, unless exemptive relief were available under an applicable exemption (as described below).

Certain prohibited transaction class exemptions (“PTCEs”) issued by the U.S. Department of Labor may provide exemptive relief for direct or indirect prohibited transactions resulting from the purchase or holding of the notes. Those class exemptions are PTCE 96-23 (for certain transactions determined by in-house asset managers), PTCE 95-60 (for certain transactions involving insurance company general accounts), PTCE 91-38 (for certain transactions involving bank collective investment funds), PTCE 90-1 (for certain transactions involving insurance company separate accounts) and PTCE 84-14 (for certain transactions determined by independent qualified asset managers). In addition, ERISA Section 408(b)(17) and Section 4975(d)(20) of the Code may provide a limited exemption for the purchase and sale of the notes and related lending transactions, provided that neither the issuer of the notes nor any of its affiliates have or exercise any discretionary authority or control or render any investment advice with respect to the assets of the Plan involved in the transaction and provided further that the Plan pays no more, and receives no less, than adequate consideration in connection with the transaction (the so-called “service provider exemption”). There can be no assurance that any of these statutory or class exemptions will be available with respect to transactions involving the notes.

Accordingly, the notes may not be purchased or held by any Plan, any entity whose underlying assets include “plan assets” by reason of any Plan’s investment in the entity (a “Plan Asset Entity”) or any person investing “plan assets” of any Plan, unless such purchaser or holder is eligible for the exemptive relief available under PTCE 96-23, 95-60, 91-38, 90-1 or 84-14 or the service provider exemption or there is some other basis on which the purchase and holding of the notes will not constitute a non-exempt prohibited transaction under ERISA or Section 4975 of the Code. Each purchaser or holder of the notes or any interest therein will be deemed to have represented by its purchase or holding of the notes that (a) it is not a Plan and its purchase and holding of the notes is not made on behalf of or with “plan assets” of any Plan or (b) its purchase and holding of the notes will not result in a non-exempt prohibited transaction under Section 406 of ERISA or Section 4975 of the Code.

Certain governmental plans (as defined in Section 3(32) of ERISA), church plans (as defined in Section 3(33) of ERISA) and non-U.S. plans (as described in Section 4(b)(4) of ERISA) (“Non-ERISA Arrangements”) are not subject to these “prohibited transaction” rules of ERISA or Section 4975 of the Code, but may be subject to similar rules under other applicable laws or regulations (“Similar Laws”). Accordingly, each such purchaser or holder of the notes shall be required to represent (and deemed to have represented by its purchase of the notes) that such purchase and holding is not prohibited under applicable Similar Laws.

Due to the complexity of these rules, it is particularly important that fiduciaries or other persons considering purchasing the notes on behalf of or with “plan assets” of any Plan consult with their counsel regarding the relevant provisions of ERISA, the Code or any Similar Laws and the availability of exemptive relief under PTCE 96-23, 95-60, 91-38, 90-1, 84-14, the service provider exemption or some other basis on which the acquisition

and holding will not constitute a non-exempt prohibited transaction under ERISA or Section 4975 of the Code or a violation of any applicable Similar Laws.

The notes are contractual financial instruments. The financial exposure provided by the notes is not a substitute or proxy for, and is not intended as a substitute or proxy for, individualized investment management or advice for the benefit of any purchaser or holder of the notes. The notes have not been designed and will not be administered in a manner intended to reflect the individualized needs and objectives of any purchaser or holder of the notes.

Each purchaser and holder of the notes has exclusive responsibility for ensuring that its purchase, holding and subsequent disposition of the notes does not violate the fiduciary or prohibited transaction rules of ERISA, the Code or any applicable Similar Laws. The sale of any notes to any Plan is in no respect a representation by us or any of our affiliates or representatives that such an investment meets all relevant legal requirements with respect to investments by Plans or Non-ERISA Arrangements generally or any particular Plan or Non-ERISA Arrangement, or that such an investment is appropriate for Plans or Non-ERISA Arrangements generally or any particular Plan or Non-ERISA Arrangement.

However, individual retirement accounts, individual retirement annuities and Keogh plans, as well as employee benefit plans that permit participants to direct the investment of their accounts, will not be permitted to purchase or hold the notes if the account, plan or annuity is for the benefit of an employee of Citigroup Global Markets Inc. or a family member and the employee receives any compensation (such as, for example, an addition to bonus) based on the purchase of notes by the account, plan or annuity.

Certain legal matters with respect to the validity of the notes will be passed upon for Citigroup by Michael J. Tarpley, Associate General Counsel — Capital Markets of Citigroup, Davis Polk & Wardwell LLP, special products counsel to Citigroup, and/or other counsel identified in the applicable supplement. Certain legal matters with respect to the underwriters will be passed upon by Cleary Gottlieb Steen & Hamilton LLP and/or other counsel identified in the applicable supplement. Mr. Tarpley beneficially owns, or has the right to acquire under Citigroup’s employee benefit plans, less than 1% of Citigroup’s common stock.

Citigroup will provide the specific terms of these securities in supplements to this prospectus. You should read this prospectus, the accompanying prospectus supplement and any applicable pricing supplement carefully before you invest. Citigroup may offer and sell these securities to or through one or more underwriters, dealers and agents, including Citigroup Global Markets Inc, a broker-dealer subsidiary of Citigroup, or directly to purchasers, on a continuous or delayed basis. The common stock of Citigroup Inc. is listed on the New York Stock Exchange and trades under the ticker symbol “C”.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this prospectus or any accompanying prospectus supplement is truthful or complete. Any representation to the contrary is a criminal offense.

These securities are not deposits or savings accounts but are unsecured obligations of Citigroup. These securities are not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency or instrumentality.

PROSPECTUS SUMMARY

This summary provides a brief overview of the key aspects of Citigroup and all material terms of the offered securities that are known as of the date of this prospectus. For a more complete understanding of the terms of the offered securities, before making your investment decision, you should carefully read:

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this prospectus, which explains the general terms of the securities that Citigroup may offer;

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the accompanying prospectus supplement, which (1) explains the specific terms of the securities being offered and (2) updates and changes information in this prospectus; and

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the documents referred to in “Where You Can Find More Information” on page 6 for information on Citigroup, including its financial statements.

Citigroup Inc.

Citigroup Inc. is a global diversified financial services holding company whose businesses provide a broad range of financial products and services to consumers, corporations, governments and institutions. Citigroup has approximately 200 million customer accounts and does business in more than 160 countries and jurisdictions. Citigroup’s activities are conducted through the Regional Consumer Banking, Institutional Clients Group, Citi Holdings and Corporate/Other business segments. Its businesses conduct their activities across the North America, Latin America, Asia and Europe, Middle East and Africa regions. Citigroup’s principal subsidiaries are Citibank, N.A., Citigroup Global Markets Inc. and Grupo Financiero Banamex, S.A. de C.V., each of which is a wholly owned, indirect subsidiary of Citigroup. Citigroup was incorporated in 1988 under the laws of the State of Delaware as a corporation with perpetual duration.

Citigroup’s principal executive office is at 399 Park Avenue, New York, NY 10043, and its telephone number is (212) 559-1000.

The Securities Citigroup May Offer

Citigroup may use this prospectus to offer up to $67,014,031,434 of:

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debt securities;

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common stock warrants;

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index warrants;

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preferred stock;

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depositary shares;

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stock purchase contracts;

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stock purchase units; and

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common stock.

A prospectus supplement will describe the specific types, amounts, prices and detailed terms of, and important United States federal income tax considerations in respect of, any of these offered securities.

Debt Securities

Debt securities are unsecured general obligations of Citigroup in the form of senior or subordinated debt. Senior debt includes Citigroup’s notes, debt and guarantees and any other debt for money borrowed that is not subordinated. Subordinated debt, so designated at the time it is issued, would not be entitled to interest and principal payments if interest and principal payments on the senior debt were not made.

The senior and subordinated debt will be issued under separate indentures between Citigroup and a trustee. Below are summaries of the general features of the debt securities from these indentures. For a more

detailed description of these features, see “Description of Debt Securities” below. You are also encouraged to read the indentures, which are included or incorporated by reference in Citigroup’s registration statement of which this prospectus forms a part, Citigroup’s most recent annual report on Form 10-K, Citigroup’s quarterly reports on Form 10-Q filed after the Form 10-K and Citigroup’s current reports on Form 8-K filed after the period covered by Citigroup’s most recent annual report on Form 10-K. You can receive copies of these documents by following the directions on page 6.

General Indenture Provisions that Apply to Senior and Subordinated Debt

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Neither indenture limits the amount of debt that Citigroup may issue or provides holders any protection should there be a highly leveraged transaction involving Citigroup, although the senior debt indenture does limit Citigroup’s ability to pledge the stock of any subsidiary that meets the financial thresholds in the indenture. These thresholds are described below under “Description of Debt Securities — Covenants.”

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The senior debt indenture allows for different types of debt securities, including indexed securities, to be issued in series.

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The indentures allow Citigroup to merge or to consolidate with another company, or sell all or substantially all of its assets to another company. If any of these events occur, the other company generally would be required to assume Citigroup’s responsibilities for the debt. Unless the transaction resulted in a default, Citigroup would be released from all liabilities and obligations under the debt securities when the other company assumed its responsibilities.

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The indentures provide that holders of 66²/₃% of the principal amount of the senior debt securities and holders of a majority of the total principal amount of the subordinated debt securities outstanding in any series may vote to change Citigroup’s obligations or your rights concerning those securities. However, changes to the financial terms of that security, including changes in the payment of principal or interest on that security or the currency of payment, cannot be made unless every holder affected consents to the change.

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Citigroup may satisfy its obligations under the debt securities or be released from its obligation to comply with the limitations discussed above at any time by depositing sufficient amounts of cash or U.S. government securities with the trustee to pay Citigroup’s obligations under the particular securities when due.

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The indentures govern the actions of the trustee with regard to the debt securities, including when the trustee is required to give notices to holders of the securities and when lost or stolen debt securities may be replaced.

Events of Default and Defaults

The events of default specified in the senior debt indenture and defaults under the subordinated debt indenture include:

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failure to pay principal when due;

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failure to pay required interest for 30 days;

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failure to make a required scheduled installment payment to a sinking fund for 30 days;

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failure to perform other covenants for 90 days after notice;

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certain events of insolvency or bankruptcy, whether voluntary or not; and

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any additional events as may be set forth in the applicable prospectus supplement.

Unless otherwise specified in connection with a particular offering of subordinated debt, the only events of default specified in the subordinated debt indenture are certain events of insolvency or bankruptcy, whether voluntary or not. There is no event of default, and accordingly there is no right of acceleration, in the case of

a default in the payment of principal of, premium, if any, or interest on, subordinated debt securities, the performance of any other covenant of Citigroup in the subordinated indenture or any other default which is not also an event of default.

Remedies

Senior Indenture: If there were an event of default, the trustee or holders of 25% of the principal amount of senior debt securities outstanding in a series could demand that the principal be paid immediately. However, holders of a majority in principal amount of the securities in that series could rescind that acceleration of the debt securities.

Subordinated Indenture: If there were an event of default involving certain events of insolvency or bankruptcy, the trustee or holders of 25% of the principal amount of subordinated debt securities outstanding in a series could demand that the principal be paid immediately. However, holders of a majority in principal amount of the securities in that series may rescind that acceleration of the debt securities. The occurrence of a default for any reason other than these events of insolvency or bankruptcy will not give the trustee or such holders the right to demand that the principal of the subordinated debt securities be paid immediately.

Common Stock Warrants

Citigroup may issue common stock warrants independently or together with any securities. Citigroup will issue any common stock warrants under a separate common stock warrant agreement between Citigroup and a bank or trust company. You are encouraged to read the standard form of the common stock warrant agreement, which will be filed as an exhibit to one of Citigroup’s future current reports and incorporated by reference in its registration statement of which this prospectus forms a part.

Common stock warrants are securities pursuant to which Citigroup may sell or purchase common stock. The particular terms of each issue of common stock warrants, the common stock warrant agreement relating to the common stock warrants and the common stock warrant certificates representing common stock warrants will be described in the applicable prospectus supplement.

Index Warrants

Citigroup may issue index warrants independently or together with debt securities. Citigroup will issue any series of index warrants under a separate index warrant agreement between Citigroup and a bank or trust company. You are encouraged to read the standard form of the index warrant agreement, which will be filed as an exhibit to one of Citigroup’s future current reports and incorporated by reference in its registration statement of which this prospectus forms a part.

Index warrants are securities that, when properly exercised by the purchaser, entitle the purchaser to receive from Citigroup an amount in cash or a number of securities that will be indexed to prices, yields, or other specified measures or changes in an index or differences between two or more indices.

The prospectus supplement for a series of index warrants will describe the formula for determining the amount in cash or number of securities, if any, that Citigroup will pay you when you exercise an index warrant and will contain information about the relevant underlying assets and other specific terms of the index warrant.

Citigroup will generally issue index warrants in book-entry form, which means that they will not be evidenced by physical certificates. Also, Citigroup will generally list index warrants for trading on a national securities exchange, such as the New York Stock Exchange (“NYSE”), NYSE Arca, the NASDAQ Global Market or the Chicago Board Options Exchange.

The index warrant agreement for any series of index warrants will provide that holders of a majority of the total principal amount of the index warrants outstanding in any series may vote to change their rights concerning those index warrants. However, changes to fundamental terms such as the amount or manner of

payment on an index warrant or changes to the exercise times cannot be made unless every holder affected consents to the change.

Any prospective purchasers of index warrants should be aware of special United States federal income tax considerations applicable to instruments such as the index warrants. The prospectus supplement relating to each series of index warrants will describe the important tax considerations.

Preferred Stock

Citigroup may issue preferred stock with various terms to be established by its board of directors or a committee designated by the board. Each series of preferred stock will be more fully described in the particular prospectus supplement that will accompany this prospectus, including redemption provisions, rights in the event of liquidation, dissolution or winding up of Citigroup, voting rights and conversion rights.

Generally, each series of preferred stock will rank on an equal basis with each other series of preferred stock and will rank prior to Citigroup’s common stock. The prospectus supplement will also describe how and when dividends will be paid on the series of preferred stock.

Depositary Shares

Citigroup may issue depositary shares representing fractional shares of preferred stock. Each particular series of depositary shares will be more fully described in the prospectus supplement that will accompany this prospectus. These depositary shares will be evidenced by depositary receipts and issued under a deposit agreement between Citigroup and a bank or trust company. You are encouraged to read the standard form of the deposit agreement, which is incorporated by reference in Citigroup’s registration statement of which this prospectus forms a part.

Stock Purchase Contracts and Stock Purchase Units

Citigroup may issue stock purchase contracts, including contracts obligating holders to purchase from or sell to Citigroup, and Citigroup to sell to or purchase from the holders, a specified number of shares of common stock, shares of preferred stock or depositary shares at a future date or dates. The stock purchase contracts may be issued separately or as part of stock purchase units, consisting of a stock purchase contract and any combination of debt securities, capital securities, junior subordinated debt securities or debt obligations of third parties, including U.S. Treasury securities. The applicable prospectus supplement will describe the terms of the stock purchase contracts and stock purchase units, including, if applicable, collateral or depositary arrangements.

Common Stock

Citigroup may issue common stock, par value $.01 per share. Holders of common stock are entitled to receive dividends when declared by Citigroup’s board of directors. Each holder of common stock is entitled to one vote per share. The holders of common stock have no preemptive rights or cumulative voting rights.

Use of Proceeds

Citigroup will use the net proceeds it receives from any offering of these securities for general corporate purposes, which may include funding its operating units and subsidiaries, financing possible acquisitions or business expansion and refinancing or extending the maturity of existing debt obligations. Citigroup may use a portion of the proceeds from the sale of index warrants and indexed notes to hedge its exposure to payments that it may have to make on such index warrants and indexed notes as described below under “Use of Proceeds and Hedging.”

Plan of Distribution

Citigroup may sell the offered securities in any of the following ways:

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to or through underwriters or dealers;

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by itself directly;

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through agents; or

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through a combination of any of these methods of sale.

The prospectus supplement will explain the ways Citigroup sells specific securities, including the names of any underwriters and details of the pricing of the securities, as well as the commissions, concessions or discounts Citigroup is granting the underwriters, dealers or agents.

If Citigroup uses underwriters in any sale, the underwriters will buy the securities for their own account and may resell the securities from time to time in one or more transactions, at a fixed public offering price or at varying prices determined at the time of sale. In connection with an offering, underwriters and selling group members and their affiliates may engage in transactions to stabilize, maintain or otherwise affect the market price of the securities, in accordance with applicable law.

Citigroup expects that the underwriters for any offering will include one or more of its broker-dealer subsidiaries, including Citigroup Global Markets Inc. These broker-dealer subsidiaries also expect to offer and sell previously issued offered securities as part of their business, and may act as a principal or agent in such transactions. Citigroup or any of its subsidiaries may use this prospectus and the related prospectus supplements and pricing supplements in connection with these activities. Offerings in which Citigroup’s broker-dealer subsidiaries participate will conform with the requirements set forth in Rule 5121 of the Financial Industry Regulatory Authority, Inc. addressing conflicts of interest when distributing the securities of an affiliate.

Ratio of Income to Fixed Charges and

Ratio of Income to Combined Fixed Charges

Including Preferred Stock Dividends

The following table shows (1) the consolidated ratio of income to fixed charges and (2) the consolidated ratio of income to combined fixed charges including preferred stock dividends of Citigroup for the three-month period ended March 31, 2011 and each of the five most recent fiscal years.


	Three Months Ended March 31, 2011		Year Ended December 31,
	Three Months Ended March 31, 2011		2010		2009		2008		2007		2006
Ratio of income to fixed charges (excluding interest on deposits)		2.07		1.78		NM		NM		1.01		1.81
Ratio of income to fixed charges (including interest on deposits)		1.70		1.52		NM		NM		1.01		1.51
Ratio of income to combined fixed charges including preferred stock dividends (excluding interest on deposits)		2.07		1.78		NM		NM		1.01		1.80
Ratio of income to combined fixed charges including preferred stock dividends (including interest on deposits)		1.70		1.52		NM		NM		1.01		1.50

NM: Not meaningful.

Where You Can Find More Information

As required by the Securities Act of 1933, Citigroup filed a registration statement relating to the securities offered by this prospectus with the Securities and Exchange Commission. This prospectus is a part of that registration statement, which includes additional information.

Citigroup files annual, quarterly and current reports, proxy statements and other information with the SEC. You may read and copy any document Citigroup files at the SEC’s public reference room in Washington, D.C. You can also request copies of the documents, upon payment of a duplicating fee, by writing the Public Reference Section of the SEC. Please call the SEC at 1-800-SEC-0330 for further information on the public reference room. These SEC filings are also available to the public from the SEC’s web site at http://www.sec.gov.

The SEC allows Citigroup to “incorporate by reference” the information it files with the SEC, which means that it can disclose important information to you by referring you to those documents. The information incorporated by reference is considered to be part of this prospectus. Information that Citigroup files later with the SEC will automatically update information in this prospectus. In all cases, you should rely on the later information over different information included in this prospectus or the prospectus supplement. Citigroup incorporates by reference the documents listed below and any future filings made with the SEC under Section 13(a), 13(c), 14 or 15(d) of the Securities Exchange Act of 1934 (File No. 1-09924):

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Annual Report on Form 10-K for the year ended December 31, 2010, filed on February 25, 2011;

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Quarterly Report on Form 10-Q for the quarter ended March 31, 2011, filed on May 5, 2011;

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Current Reports on Form 8-K filed on January 10, 2011, January 12, 2011, January 13, 2011, January 18, 2011 (to the extent filed with the SEC), January 20, 2011, January 21, 2011, January 25, 2011, February 1, 2011, February 17, 2011, February 18, 2011, February 28, 2011, March 7, 2011, March 21, 2011, March 29, 2011, April 1, 2011, April 4, 2011, April 18, 2011 (to the extent filed with the SEC), April 26, 2011 and May 9, 2011;

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Definitive Proxy Statement on Schedule 14A, filed on March 10, 2011, as amended;

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Registration Statement on Form 8-B, dated May 10, 1998, describing Citigroup’s common stock, including any amendments or reports filed for the purpose of updating such description; and

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Registration Statement on Form 8-A, filed on June 11, 2009, describing Citigroup’s common stock and associated rights to purchase the Series R preferred stock, including any amendments or reports filed for the purpose of updating such description.

In no event, however, will any of the information that Citigroup furnishes to, pursuant to Item 2.02 or Item 7.01 of any Current Report on Form 8-K (including exhibits related thereto) or other applicable SEC rules, rather than files with, the SEC be incorporated by reference or otherwise be included herein, unless such information is expressly incorporated herein by a reference in such furnished Current Report on Form 8-K or other furnished document.

All documents filed by Citigroup specified in Section 13(a), 13(c), 14 or 15(d) of the Exchange Act after the date of this prospectus and before the later of (1) the completion of the offering of the securities described in this prospectus and (2) the date the broker-dealer subsidiaries of Citigroup stop offering securities pursuant to this prospectus shall be incorporated by reference in this prospectus from the date of filing of such documents.

You may request a copy of these filings, at no cost, by writing or telephoning Citigroup at the following address:

Citigroup Document Services

540 Crosspoint Parkway

Getzville, NY 14068

(716) 730-8055 (tel.)

(877) 936-2737 (toll free)

You should rely only on the information provided in this prospectus, the prospectus supplement and any applicable pricing supplement, as well as the information incorporated by reference. Citigroup is not making an offer of these securities in any jurisdiction where the offer is not permitted. You should not assume that the information in this prospectus, the prospectus supplement, any applicable pricing supplement or any documents incorporated by reference is accurate as of any date other than the date of the applicable document.

Certain statements in this prospectus and in other information incorporated by reference in this prospectus are forward-looking statements within the meaning of the rules and regulations of the SEC. Generally, forward-looking statements are not based on historical facts but instead represent only Citigroup’s and management’s beliefs regarding future events. Such statements may be identified by words such as believe, expect, anticipate, intend, estimate, may increase, may fluctuate, and similar expressions, or future or conditional verbs such as will, should, would and could.

Such statements are based on management’s current expectations and are subject to uncertainty and changes in circumstances. Actual results may differ materially from those included in these statements due to a variety of factors, including without limitation the precautionary statements included in this prospectus and the accompanying prospectus supplement and the factors listed under “Forward-Looking Statements” and described under “Risk Factors” in Citigroup’s 2010 Annual Report on Form 10-K.

Citigroup is a holding company and services its obligations primarily by earnings from its operating subsidiaries. However, Citigroup may augment, and during the recent financial crisis did augment, its capital through issuances of common stock, convertible preferred stock, preferred stock, equity issued through awards under employee benefits plans, and, in the case of regulatory capital, through the issuance of subordinated debt underlying trust preferred securities. Citigroup’s subsidiaries that operate in the banking and securities businesses can only pay dividends if they are in compliance with the applicable regulatory requirements imposed on them by federal and state bank regulatory authorities and securities regulators. Citigroup’s ability to pay dividend is currently restricted due to its agreements with the U.S. government, generally for so long as the U.S. government continues to hold Citigroup’s trust preferred securities. Citigroup’s subsidiaries may be party to credit agreements that also may restrict their ability to pay dividends. Citigroup currently believes that none of these regulatory or contractual restrictions on the ability of its subsidiaries to pay dividends will affect Citigroup’s ability to service its own debt. Citigroup must also maintain the required capital levels of a bank holding company before it may pay dividends on its stock.

Under the regulations of the Board of Governors of the Federal Reserve System (the “Federal Reserve”), a bank holding company is expected to act as a source of financial strength for its subsidiary banks. As a result of this regulatory policy, the Federal Reserve might require Citigroup to commit resources to its subsidiary banks when doing so is not otherwise in the interests of Citigroup or its shareholders or creditors.

The principal office of Citigroup is located at 399 Park Avenue, New York, NY 10043, and its telephone number is (212) 559-1000.

General. Citigroup will use the proceeds it receives from the sale of the offered securities for general corporate purposes, which may include:

Citigroup expects to incur additional indebtedness in the future to fund its businesses. Citigroup or one or more subsidiaries may enter into a swap agreement in connection with the sale of the offered securities and may earn additional income from that transaction.

Use of Proceeds Relating to Index Warrants and Indexed Notes. Citigroup or one or more of its subsidiaries may use all or some of the proceeds received from the sale of index warrants or indexed notes to purchase or maintain positions in the underlying assets. Citigroup or one or more of its subsidiaries may also purchase or maintain positions in options, futures contracts, forward contracts or swaps, or options on the foregoing, or other derivative or similar instruments relating to the relevant index or underlying assets. Citigroup may also use the proceeds to pay the costs and expenses of hedging any currency, interest rate or other index-related risk relating to such index warrants and indexed notes.

Citigroup expects that it or one or more of its subsidiaries will increase or decrease their initial hedging position over time using techniques which help evaluate the size of any hedge based upon a variety of factors affecting the value of the underlying instrument. These factors may include the history of price changes in that underlying instrument and the time remaining to maturity. Citigroup or one or more of its subsidiaries may take long or short positions in the index, the underlying assets, options, futures contracts, forward contracts, swaps, or options on the foregoing, or other derivative or similar instruments related to the index or the underlying assets. These other hedging activities may occur from time to time before the index warrants and indexed notes mature and will depend on market conditions and the value of the index and the underlying assets.

In addition, Citigroup or one or more of its subsidiaries may purchase or otherwise acquire a long or short position in index warrants and indexed notes from time to time and may, in their sole discretion, hold, resell, exercise, cancel or retire such offered securities. Citigroup or one or more of its subsidiaries may also take hedging positions in other types of appropriate financial instruments that may become available in the future.

If Citigroup or one or more of its subsidiaries has a long hedge position in, or options, futures contracts or swaps or options on the foregoing, or other derivative or similar instruments related to, the index or underlying assets, Citigroup or one or more of its subsidiaries may liquidate all or a portion of its holdings at or about the time of the maturity or earlier redemption or repurchase of, or the payment of any indexed interest on, the index warrants and indexed notes. The aggregate amount and type of such positions are likely to vary over time depending on future market conditions and other factors. Since the hedging activities described in this section involve risks and may be influenced by a number of factors, it is possible that Citigroup or one or more of its subsidiaries may receive a profit from the hedging activities, even if the market value of the index warrants or indexed notes declines. Citigroup is only able to determine profits or losses from any such position when the position is closed out and any offsetting position or positions are taken into account.

Citigroup has no reason to believe that its hedging activities, as well as those of its subsidiaries, will have a material impact on the price of such options, futures contracts, forward contracts, swaps, options on the foregoing, or other derivative or similar instruments, or on the value of the index or the underlying assets. However, Citigroup cannot guarantee you that its hedging activities, as well as those of its subsidiaries, will not affect such prices or values. Citigroup will use the remainder of the proceeds from the sale of index warrants and indexed notes for the general corporate purposes described above.

The foreign currencies in which debt securities may be denominated or payments in respect of index warrants may be due or by which amounts due on the offered securities may be calculated could be issued by countries that are member states of the European Union that have adopted or adopt the single Euro currency in accordance with the Treaty establishing the European Community (as that Treaty is amended from time to time) (the “participating member states”).

The current seventeen participating member states are: Austria, Belgium, Cyprus, Estonia, Finland, France, Germany, Greece, Ireland, Italy, Luxembourg, Malta, the Netherlands, Portugal, Slovakia, Slovenia and Spain. Other member states of the European Union may also become participating member states of the single Euro currency.

The debt securities offered by this prospectus will be unsecured obligations of Citigroup and will be either senior or subordinated debt. Senior debt securities will be issued under a senior debt indenture. Subordinated debt securities will be issued under a subordinated debt indenture. The senior debt indenture and the subordinated debt indenture are sometimes referred to in this prospectus individually as an “indenture” and collectively as the “indentures.” Forms of the indentures have been filed with the SEC and are incorporated by reference or included in the registration statement on Form S-3 under the Securities Act of 1933, as amended, of which this prospectus forms a part.

The following briefly summarizes the material provisions of the indentures and the debt securities, other than pricing and related terms disclosed in the accompanying prospectus supplement or pricing supplement, as the case may be. You should read the more detailed provisions of the applicable indenture, including the defined terms, for provisions that may be important to you. You should also read the particular terms of an offering of debt securities, which will be described in more detail in the applicable prospectus supplement or pricing supplement, as the case may be. Copies of the indentures may be obtained from Citigroup or the applicable trustee. So that you may easily locate the more detailed provisions, the numbers in parentheses below refer to sections in the applicable indenture or, if no indenture is specified, to sections in each of the indentures. Wherever particular sections or defined terms of the applicable indenture are referred to, such sections or defined terms are incorporated into this prospectus by reference, and the statements in this prospectus are qualified by that reference.

As used in this prospectus, the term “supplement” means either a prospectus supplement or a pricing supplement, as applicable.

Unless otherwise specified in connection with a particular offering of debt securities, the trustee under the senior debt indenture and under the subordinated indenture will be The Bank of New York Mellon (formerly known as The Bank of New York). Citigroup has appointed Citibank, N.A. to act as paying agent under each indenture.

The indentures provide that unsecured senior or subordinated debt securities of Citigroup may be issued in one or more series, with different terms, in each case as authorized from time to time by Citigroup. Citigroup also has the right to “reopen” a previous issue of a series of debt securities by issuing additional debt securities of such series.

United States federal income tax consequences and other special considerations applicable to any debt securities issued by Citigroup at a discount or a premium will be described in the applicable supplement.

Because Citigroup is a holding company, the claims of creditors of Citigroup’s subsidiaries will have a priority over Citigroup’s equity rights and the rights of Citigroup’s creditors, including the holders of debt securities, to participate in the assets of the subsidiary upon the subsidiary’s liquidation.

The applicable supplement relating to any offering of debt securities will describe the following terms, where applicable:

The terms on which debt securities may be convertible into or exchangeable for common stock or other securities of Citigroup will be set forth in the supplement relating to such offering. Such terms will include provisions as to whether conversion or exchange is mandatory, at the option of the holder or at the option of Citigroup. The terms may include provisions pursuant to which the number of shares of common stock or other securities of Citigroup to be received by the holders of such debt securities may be adjusted.

Unless otherwise specified in connection with a particular offering of debt securities, the debt securities are not redeemable prior to maturity, except upon the occurrence of certain tax events described below under “— Redemption for Tax Purposes.” The redemption price for the debt securities upon the occurrence of certain tax events will be 100% of the principal amount thereof plus accrued interest to the date of the redemption.

Unless otherwise specified in connection with a particular offering of debt securities, the debt securities are not subject to any sinking fund.

Unless otherwise specified in connection with a particular offering of debt securities, debt securities denominated in U.S. dollars will be issued only in denominations of $1,000 and whole multiples of $1,000 in

excess thereof (Section 2.01). The supplement relating to debt securities denominated in a foreign currency will specify the denomination of such debt securities.

The currency for payment for book-entry debt securities denominated in a foreign currency will be specified in the applicable supplement. However, when interests in such debt securities are held through The Depositary Trust Company (“DTC”), all payments in respect of such debt securities will be made in U.S. dollars, unless the holder of a beneficial interest in the DTC debt securities elects to receive payment in the foreign currency specified in the applicable supplement. See “— Book-Entry Procedures and Settlement” and “Currency Conversions and Foreign Exchange Risks Affecting Debt Securities Denominated in a Foreign Currency — Currency Conversion” below.

Citigroup may, without notice to or consent of the holders or beneficial owners of a series of debt securities, issue additional debt securities having the same ranking, interest rate, maturity and other terms as the debt securities initially issued. Any such debt securities could be considered part of the same series of debt securities under the indenture as the debt securities initially issued.

The senior debt securities will be issued only in registered form. The subordinated debt securities may be issued in registered form, bearer form, or both; however, unless otherwise specified in connection with a particular offering of subordinated debt securities, the subordinated debt securities will be issued in registered form. If bearer securities are issued, the United States federal income tax consequences and other special considerations, procedures and limitations applicable to such bearer securities will be described in the applicable supplement. As currently anticipated, debt securities of a series will trade in book-entry form, and global notes will be issued in physical (paper) form, as described below under “— Book-Entry Procedures and Settlement.”

Unless otherwise specified in connection with a particular offering of debt securities, the debt securities may be presented for exchange, and debt securities other than a global security may be presented for registration of transfer, at the principal trust office of the relevant trustee in New York City. Holders will not have to pay any service charge for any registration of transfer or exchange of debt securities, but Citigroup may require payment of a sum sufficient to cover any tax or other governmental charge payable in connection with such registration of transfer. (Section 2.05) Debt securities in bearer form will be transferable by delivery. Provisions with respect to the exchange of debt securities in bearer form will be described in the applicable supplement.

Unless otherwise specified in connection with a particular offering of debt securities denominated in a foreign currency, a fiscal agency agreement will be entered into in relation to the debt securities between Citigroup and Citibank, N.A., London office, as registrar, fiscal agent and principal paying agent. The terms “registrar,” “fiscal agent,” and “principal paying agent” shall include any successors appointed from time to time in accordance with the provisions of the fiscal agency agreement, and any reference to an “agent” or “agents” shall mean any or all (as applicable) of such persons. The holders of the debt securities are bound by, and are deemed to have notice of, the provisions of the fiscal agency agreement. Unless otherwise specified in connection with a particular offering of debt securities, copies of the fiscal agency agreement are available for inspection during usual business hours at the principal office of Citibank, N.A. London office, located at Citigroup Centre, Canada Square, Canary Wharf, London, England, and at the office of Dexia Banque Internationale à Luxembourg S.A., as long as the debt securities are listed on the Luxembourg Stock Exchange.

Payments of principal and interest on debt securities issued in book-entry form will be made as described below under “— Book-Entry Procedures and Settlement.” Payments of principal and interest on debt securities issued in definitive form, if any, will be made as described below under “— Definitive Notes and Paying Agents.”

Unless otherwise specified in connection with a particular offering of debt securities, interest on the debt securities will be paid as follows:

Unless otherwise specified in connection with a particular offering of debt securities, all payments of interest on debt securities paying a fixed rate of interest (“fixed rate notes”) will be made to the persons in whose names the fixed rate notes are registered at the close of business on the first Business Day of the month in which payment is to be made, and all payments of interest on debt securities paying a floating rate of interest (“floating rate notes”) will be made to the persons in whose names the floating rate notes are registered at the close of business on the Business Day preceding an interest payment date.

If an interest payment date for a fixed rate note or the maturity date of the debt securities falls on a day that is not a Business Day, the payment due on such interest payment date or on the maturity date will be postponed to the next succeeding Business Day, and no further interest will accrue in respect of such postponement. Unless otherwise specified in connection with a particular offering of debt securities, if an interest payment date for a floating rate note falls on a day that is not a Business Day, such interest payment date will be the next following Business Day unless that day falls in the next calendar month, in which case the interest payment date will be the first preceding Business Day.

Unless otherwise specified in connection with a particular offering of debt securities, in this section, “Business Day” means any day which is a day on which commercial banks settle payments and are open for general business (a) in New York, in the case of U.S. dollar-denominated debt securities; (b) in New York, London and Tokyo, in the case of Yen-denominated debt securities; (c) in New York and London and which is also a TARGET business day (“TARGET”), in the case of Euro-denominated debt securities. A “TARGET business day” is a day on which TARGET 2 is open for the settlement of payment in Euro, and “TARGET 2” is the Trans-European Automated Real-Time Gross Settlement Express Transfer payment system which utilizes a single shared platform and which was launched on November 19, 2007. Unless otherwise specified in connection with a particular offering of debt securities, in the case of Canadian dollar-denominated debt securities, “Business Day” shall mean any Toronto business day which is a day on which commercial banks and foreign exchange markets settle payments and are open for general business (including dealings in foreign currency deposits and foreign exchange) in Toronto.

If a date for payment of interest or principal on the debt securities falls on a day that is not a business day in the place of payment, such payment will be made on the next succeeding business day in such place of payment as if made on the date the payment was due. No interest will accrue on any amounts payable for the period from and after the due date for payment of such principal or interest.

Unless otherwise specified in connection with a particular offering of debt securities, each fixed rate note will bear interest from its original issue date, or from the last interest payment date to which interest has been

paid or duly provided for, at the rate per annum stated in the applicable supplement until its principal amount is paid or made available for payment.

Unless otherwise specified in connection with a particular offering of debt securities, interest on each fixed rate note will be payable semi-annually in arrears on the dates set forth in the applicable supplement, with each such day being an interest payment date, and at maturity. Unless otherwise specified in connection with a particular offering of debt securities, interest on U.S.-dollar-denominated fixed rate notes will be calculated on the basis of a 360-day year comprised of twelve 30-day months or, in the case of an incomplete month, the number of days elapsed. The day-count for fixed rate notes denominated in any other currency will be set forth in the applicable supplement. All U.S. dollar, Canadian dollar and Euro amounts resulting from this calculation will be rounded to the nearest cent, with one-half cent being rounded upward. All Yen amounts resulting from this calculation will be rounded to the nearest Yen, with five-tenths or more of ¥1 to be rounded upwards to the nearest ¥1 per debt security. The rounding convention for any other currency will be set forth in the applicable supplement.

Each floating rate note will bear interest at the interest rate specified in the supplement relating to a particular series of debt securities. Unless otherwise specified in connection with a particular offering of debt securities, interest on each floating rate note will be payable quarterly in arrears on the dates set forth in the applicable supplement, with each such day being an interest payment date, and at maturity. Unless otherwise specified in connection with a particular offering of debt securities, interest on floating rate notes will be calculated on the basis of the actual number of days in an interest period and a 360-day year. An interest period is the period commencing on an interest payment date and ending on the day preceding the next following interest payment date.

The first interest period will commence on the day the floating rate notes are issued and will end on the day preceding the next following interest payment date.

The interest rate for each offering of floating rate notes for a particular interest period will be a per annum rate equal to the base rate specified in the applicable supplement, as determined on the relevant interest determination date (defined below for each base rate), plus or minus any spread or multiplied by any spread multiplier. A basis point, or bp, equals one-hundredth of a percentage point. The spread is the number of basis points specified in the applicable supplement and the spread multiplier is the percentage specified in the applicable supplement.

Each floating rate note will bear interest for each interest period at a rate determined by Citibank, N.A., acting as calculation agent. Promptly upon determination, the calculation agent will inform the trustee and Citigroup of the interest rate for the next interest period. Absent manifest error, the determination of the interest rate by the calculation agent shall be binding and conclusive on the holders of such floating rate notes, the trustee and Citigroup. As long as the floating rate notes are listed on the Luxembourg Stock Exchange, the Luxembourg Stock Exchange shall be notified of the interest rate, the amount of the interest payment and the interest payment date for a particular interest period not later than the first day of such interest period. Upon request from any noteholder, the calculation agent will provide the interest rate in effect on the notes for the current interest period and, if it has been determined, the interest rate to be in effect for the next interest period.

The applicable supplement will designate one of the following base rates as applicable to an offering of floating rate notes:

The “index maturity” is the period of maturity of the instrument or obligation from which the base rate is calculated.

“H.15(519)” means the publication entitled “Statistical Release H.15(519), Selected Interest Rates,” or any successor publication, published by the Federal Reserve.

“H.15 Daily Update” means the daily update of the Federal Reserve at http://www.federalreserve.gov/releases/H15/update or any successor site or publication.

Unless otherwise specified in connection with a particular offering of debt securities, in this section, business day means:

As used above, a “principal financial center” means the capital city of the country issuing the specified currency. However, for Australian dollars, Canadian dollars, New Zealand dollars and Swiss francs, the principal financial center may be specified in the applicable supplement as Sydney, Toronto, Auckland and Zurich, respectively.

Unless otherwise specified in connection with a particular offering of debt securities, each of the following base rates will be determined by the calculation agent as described below. Unless otherwise specified in connection with a particular offering of debt securities, all percentages resulting from any calculation of the rate of interest on a floating rate note will be rounded, if necessary, to the nearest 1/100,000 of 1% (.0000001), with five one-millionths of a percentage point rounded upward. All currency amounts used in, or resulting from, the calculation on floating rate notes will be rounded to the nearest one-hundredth of a unit. For purposes of rounding, .005 of a unit shall be rounded upward.

LIBOR Notes. Each LIBOR note will bear interest for each interest period at an interest rate equal to LIBOR and any spread or spread multiplier specified in the note and the applicable supplement.

The calculation agent will determine LIBOR on each interest determination date. The interest determination date is the second London business day prior to each interest period.

On an interest determination date, the calculation agent will determine LIBOR for each interest period as follows.

The calculation agent will determine the offered rates for deposits in a principal amount equal to at least $1,000,000 or the approximate equivalent in the specified currency for the period of the index maturity specified in the applicable supplement commencing on the interest determination date, which appear on the “designated LIBOR page” at approximately 11:00 a.m., London time, on that date.

If LIBOR cannot be determined on an interest determination date as described above, then the calculation agent will determine LIBOR as follows.

Treasury Rate Notes. Each Treasury Rate note will bear interest for each interest period at an interest rate equal to the Treasury Rate and any spread or spread multiplier, specified in the note and the applicable supplement.

The calculation agent will determine the Treasury Rate on each interest determination date. The interest determination date for each interest period will be the day of the week in which the beginning of that interest period falls on which treasury securities are normally auctioned. Treasury securities are normally sold at auction on Monday of each week unless that day is a legal holiday. In that case the auction is normally held on the following Tuesday, except that the auction may be held on the preceding Friday. If, as the result of a legal holiday, an auction is held on the Friday of the week preceding an interest period, that Friday will be the interest determination date pertaining to the interest period commencing in the next succeeding week. If an auction date falls on any day that would otherwise be an interest determination date for a Treasury Rate note, then that interest determination date will instead be the business day immediately following the auction date.

Unless “Constant Maturity” is specified in the applicable supplement, the Treasury Rate for each interest period will be the rate for the auction held on the Treasury Rate determination date for such interest period of treasury securities (as defined below) as such rate appears on Reuters (or any successor service) on page USAUCTION10 (or any other page as may replace such page on such service) (“Reuters Page USAUCTION10”) or page USAUCTION11 (or any other page as may replace such page on such service)

(“Reuters Page USAUCTION11” opposite the caption “INVEST RATE.” Treasury securities are direct obligations of the United States that have the index maturity specified in the applicable Note or supplement.

If the Treasury Rate cannot be determined as described above, the following procedures will be followed in the order set forth below.

Bond Equivalent Yield will be expressed as a percentage and calculated as follows:

Prime Rate Notes. Prime Rate notes will bear interest at a rate equal to the Prime Rate and any spread or spread multiplier specified in the Prime Rate notes and the applicable supplement.

The calculation agent will determine the Prime Rate for each interest period on each interest determination date. The interest determination date is the second business day prior to each interest period. The Prime Rate will

be the rate made available and subsequently published on that date in H.15(519) opposite the caption “Bank Prime Loan.”

The following procedures will be followed if the Prime Rate cannot be determined as described above.

“Reuters Screen USPRIME1 page” means the display which appears on the display on Reuters (or any successor service) as page “USPRIME1” (or any other page as may replace such page), for the purpose of displaying prime rates or base lending rates of major United States banks.

EURIBOR Notes. Each EURIBOR note will bear interest for each interest period at an interest rate equal to EURIBOR and any spread or spread multiplier specified in the note and the applicable supplement.

The calculation agent will determine EURIBOR on each interest determination date. The interest determination date is the second TARGET business day prior to each interest period.

On an interest determination date, the calculation agent will determine EURIBOR for each interest period as follows.

The calculation agent will determine the offered rates for deposits in euros for the period of the index maturity specified in the applicable supplement, in amounts of at least €1,000,000, commencing on the interest determination date, which appears on the display on Reuters (or any successor service) on EURIBOR1 (or any other page as may replace such page on such service) as of 11:00 a.m., Brussels time, on that date.

If EURIBOR cannot be determined on an interest determination date as described above, then the calculation agent will determine EURIBOR as follows.

“Euro-zone” means the region comprised of member states of the European Union that adopted the Euro as their single currency.

CDOR Rate Notes. Each CDOR note will bear interest for each interest period at an interest rate equal to the Canadian dollar three-month Banker’s Acceptance Rate (“CDOR”) and any spread or spread multiplier specified in the note and the applicable supplement.

The calculation agent will determine CDOR on each interest determination date. The interest determination date is the first day of such interest period. CDOR will be the offered rate for Canadian dollar bankers’ acceptances having a maturity of three months, as such rate appears on the Reuters Screen CDOR page, or such other replacing service or such other service that may be nominated by the person sponsoring the information appearing there for the purpose of displaying offered rates for Canadian dollar bankers’ acceptances having a maturity of three months, at approximately 10:00 a.m., Toronto time, on such interest determination date.

The following procedures will be followed if CDOR cannot be determined as described above.

Floating/Fixed Rate Notes. The applicable supplement may provide that a debt security will be a floating rate note for a specified portion of its term and a fixed rate note for the remainder of its term. In such an event, the interest rate on the debt security will be determined as if it were a floating rate note and a fixed rate note for each respective period, all as specified herein and in the applicable supplement.

Citigroup may from time to time offer dual currency debt securities on which Citigroup has the option of making all payments of principal and interest on such debt securities, the payments on which would otherwise be made in the specified currency of those debt securities, in the optional payment currency specified in the applicable supplement. This option will be exercisable in whole but not in part on an option election date, which

will be any of the dates specified in the applicable supplement. Information as to the relative value of the specified currency compared to the optional payment currency will be set forth in the applicable supplement.

The supplement for each issuance of dual currency debt securities will specify, among other things, the specified currency; the optional payment currency; and the designated exchange rate. The designated exchange rate will be a fixed exchange rate used for converting amounts denominated in the specified currency into amounts denominated in the optional payment currency. The supplement will also specify the option election dates and interest payment dates for the related issuance of dual currency debt securities. Each option election date will be a particular number of days before an interest payment date or maturity, as set forth in the applicable supplement. Each option election date will be the date on which Citigroup may select whether to make all scheduled payments due thereafter in the optional payment currency rather than in the specified currency.

If Citigroup makes such an election, the amount payable in the optional payment currency will be determined using the designated exchange rate specified in the applicable supplement. Unless otherwise specified in connection with a particular offering of debt securities, if such an election is made, notice of the election will be provided in accordance with the terms of the dual currency debt securities within two business days of the option election date. The notice will state (1) the first date, whether an interest payment date and/or maturity, on which scheduled payments in the optional payment currency will be made and (2) the designated exchange rate. Unless otherwise specified in the applicable supplement, any such notice by Citigroup, once given, may not be withdrawn. The equivalent value in the specified currency of payments made after such an election may be less, at the then current exchange rate, than if Citigroup had made the payment in the specified currency.

For United States federal income tax purposes, holders of dual currency debt securities may need to comply with rules which differ from the general rules applicable to holders of other types of debt securities offered by this prospectus. The United States federal income tax consequences of the purchase, ownership and disposition of dual currency debt securities will be set forth in the applicable supplement.

If so stated in the supplement relating to a particular offering of debt securities, Citigroup may extend the stated maturity of those debt securities for an extension period. Unless otherwise specified in connection with a particular offering of debt securities, such an extension period will be one or more periods of one to five whole years, up to but not beyond the final maturity date set forth in the supplement.

Unless otherwise specified in connection with a particular offering of debt securities, Citigroup may exercise its option for a particular offering of debt securities by notifying the trustee for that series at least 45 but not more than 60 days prior to the original stated maturity of the debt security. Not later than 40 days prior to the original stated maturity of the debt security, the trustee for the debt securities will provide notice of the extension to the holder, in accordance with “— Book-Entry Procedures and Settlement — Notices” below. The extension notice will set forth among other items: the election of Citigroup to extend the stated maturity of the debt security; the new stated maturity; in the case of a fixed rate note, the interest rate applicable to the extension period; in the case of a floating rate note, the spread, spread multiplier or method of calculation applicable to the extension period; and any provisions for redemption during the extension period, including the date or dates on which, or the period or periods during which, and the price or prices at which, a redemption may occur during the extension period.

Unless otherwise specified in connection with a particular offering of debt securities, upon the provision by such trustee of an extension notice in accordance with “Book-Entry Procedures and Settlement — Notices” below, the stated maturity of the debt security will be extended automatically, and, except as modified by the extension notice and as described in the next paragraph, the debt security will have the same terms as prior to the extension notice.

Despite the foregoing and unless otherwise specified in connection with a particular offering of debt securities, not later than 20 days prior to the original stated maturity of the debt security, Citigroup may, at its option, revoke the interest rate, or the spread or spread multiplier, as the case may be, provided for in the extension notice for the debt security and establish for the extension period a higher interest rate, in the case of a fixed rate note, or a higher spread or spread multiplier, in the case of a floating rate note. Citigroup may so act by

causing the trustee for the debt security to provide notice of the higher interest rate or higher spread or spread multiplier, as the case may be, in accordance with “— Book-Entry Procedures and Settlement — Notices” below, to the holder of the debt security. Unless otherwise specified in connection with a particular offering of debt securities, the notice will be irrevocable. Unless otherwise specified in connection with a particular offering of debt securities, all debt securities for which the stated maturity is extended will bear the higher interest rate, in the case of fixed rate notes, or higher spread or spread multiplier, in the case of floating rate notes, for the extension period, whether or not tendered for repayment.

If so stated in the supplement relating to a particular offering of debt securities, the holder of a debt security of which Citigroup elects to extend maturity may have the option of early redemption, repayment or repurchase.

Unless otherwise specified in connection with a particular offering of debt securities, application will be made to list and trade the debt securities on the regulated market of the Luxembourg Stock Exchange.

Directive 2006/43/EC of the European Parliament and of the Council of 17 May 2006 on statutory audits of annual accounts and consolidate accounts, (the “Statutory Audit Directive”) entered into force on 29 June 2006. It requires member states to take measures necessary to comply with the Statutory Audit Directive by 29 June 2008.

Amongst other things the Statutory Audit Directive requires that, where an issuer’s securities are admitted to trading on a regulated market in any member state of the European Economic Area (the “EEA”) and its auditor is from a country outside the EEA then, unless covered by an exemption or derogation, that auditor must be registered in that member state and be subject to that member state’s system of oversight, quality assurance, investigation and penalties. The Statutory Audit Directive further provides that audit reports issued by auditors from countries outside the EEA which are not so registered (or covered by an exemption or derogation) shall have no legal effect in the relevant member state.

As a result of having securities admitted to trading on the Regulated Market of the Luxembourg Stock Exchange, Citigroup will be required by Directive 2004/109/EC of the European Parliament and of the Council of 15 December 2004 on the harmonization of transparency requirements in relation to information about issuers whose securities are admitted to trading on a regulated market (the “Transparency Directive”) and implementing measures in Luxembourg to publish at the latest four months after the end of each of its financial years an annual financial report containing, amongst other things, its audited financial statements.

On May 27, 2008, the European Commission published a draft Decision proposing a period of transitional relief to run from 29 June 2008 to 1 July 2010. According to the proposal, during this period auditors from certain countries outside the EEA need not be registered in accordance with the Statutory Audit Directive provided that the auditor supplies the competent authority in the relevant member state with certain information.

As of the date of this prospectus, Citigroup’s auditors are registered pursuant to the Statutory Audit Directive and implementing measures (or covered by an exemption or derogation) in Luxembourg, but the proposed transitional relief is available to them. By the date on which Citigroup will be obliged pursuant to the Transparency Directive and implementing measures in Luxembourg to publish its first annual financial report after the date of expiration of the proposed transitional relief Citigroup may determine that, as a result of the Statutory Audit Directive, the Transparency Directive or implementing measures in Luxembourg, it has become impracticable or unduly burdensome to maintain the admission of securities to trading on the regulated market of the Luxembourg Stock Exchange. In such event Citigroup may seek an alternative admission to listing, trading and/or quotation for the Notes on a different market segment of the Luxembourg stock exchange or by such other competent authority, stock exchange and/or quotation system inside or outside the EEA as it may decide.

If such an alternative admission is not available to Citigroup or is, in Citigroup’s opinion, unduly burdensome, an alternative admission may not be obtained. Notice of any de-listing and/or alternative admission will be given as described under “— Book-Entry Procedures and Settlement — Notices” below.

Unless otherwise specified in connection with a particular offering of debt securities, Citigroup will pay additional amounts to the beneficial owner of any debt security that is a non-United States person in order to ensure that every net payment on such debt security will not be less, due to payment of U.S. withholding tax, than the amount then due and payable. For this purpose, a “net payment” on a debt security means a payment by Citigroup or a paying agent, including payment of principal and interest, after deduction for any present or future tax, assessment or other governmental charge of the United States. These additional amounts will constitute additional interest on the debt security.

Unless otherwise specified in connection with a particular offering of debt securities, Citigroup will not be required to pay additional amounts, however, in any of the circumstances described in items (1) through (13) below.

For purposes of items (1) through (4) above, “beneficial owner” means a fiduciary, settlor, beneficiary, member or shareholder of the holder if the holder is an estate, trust, partnership, limited liability company, corporation or other entity, or a person holding a power over an estate or trust administered by a fiduciary holder.

or that is not the sole beneficial owner of the debt security, or any portion of the debt security. However, this exception to the obligation to pay additional amounts will only apply to the extent that a beneficiary or settlor in relation to the fiduciary, or a beneficial owner or member of the partnership, limited liability company or other fiscally transparent entity, would not have been entitled to the payment of an additional amount had the beneficiary, settlor, beneficial owner or member received directly its beneficial or distributive share of the payment.

Except as specifically provided in this section (“Payment of Additional Amounts”) and under “— Redemption for Tax Purposes” below, Citigroup will not be required to make any payment of any tax, assessment or other governmental charge imposed by any government or a political subdivision or taxing authority of such government.

Additionally, “non-United States person” means a person who is not a United States person, and “United States” means the United States of America, including the states of the United States of America and the District of Columbia, but excluding its territories and possessions.

Unless otherwise specified in connection with a particular offering of debt securities, Citigroup may, at its option, redeem a series of debt securities as a whole, but not in part, on not less than 30 nor more than 60 days’ prior notice, only in the circumstances described in items (1) or (2) below under “— Redemption Circumstances.” To redeem, Citigroup must pay a redemption price equal to 100% of the principal amount of the debt securities, together with accrued interest to the redemption date.

Unless otherwise specified in connection with a particular offering of debt securities, there are two sets of circumstances in which Citigroup may redeem the debt securities in the manner described above under “— Redemption Procedure”:

Unless otherwise specified in connection with a particular offering of debt securities, we will issue debt securities under a book-entry system in the form of one or more global securities. We will register the global securities in the name of a depositary or its nominee and deposit the global securities with that depositary. Unless otherwise specified in connection with a particular offering of debt securities, The Depository Trust Company, New York, New York, or DTC, will be the depositary if we use a depositary.

Following the issuance of a global security in registered form, the depositary will credit the accounts of its participants with the debt securities upon our instructions. Only persons who hold directly or indirectly through financial institutions that are participants in the depositary can hold beneficial interests in the global securities. Because the laws of some jurisdictions require certain types of purchasers to take physical delivery of such securities in definitive form, you may encounter difficulties in your ability to own, transfer or pledge beneficial interests in a global security.

So long as the depositary or its nominee is the registered owner of a global security, we and the relevant trustee will treat the depositary as the sole owner or holder of the debt securities for purposes of the applicable indenture. Therefore, except as set forth below, you will not be entitled to have debt securities registered in your name or to receive physical delivery of certificates representing the debt securities. Accordingly, you will have to rely on the procedures of the depositary and the participant in the depositary through whom you hold your beneficial interest in order to exercise any rights of a holder under the indenture. We understand that under existing practices, the depositary would act upon the instructions of a participant or authorize that participant to take any action that a holder is entitled to take.

You may elect to hold interests in the global securities either in the United States through DTC or outside the United States through Clearstream Banking, société anonyme (“Clearstream”) or Euroclear Bank, S.A./N.V., or its successor, as operator of the Euroclear System, (“Euroclear”) if you are a participant of such system, or indirectly through organizations that are participants in such systems. Interests held through Clearstream and Euroclear will be recorded on DTC’s books as being held by the U.S. depositary for each of Clearstream and Euroclear, which U.S. depositaries will in turn hold interests on behalf of their participants’ customers’ securities accounts.

As long as the debt securities are represented by the global securities, we will pay principal of and interest and premium, if any, on those securities to or as directed by DTC as the registered holder of the global securities. Payments to DTC will be in immediately available funds by wire transfer. DTC, Clearstream or Euroclear, as applicable, will credit the relevant accounts of their participants on the applicable date. Neither we nor the relevant trustee will be responsible for making any payments to participants or customers of participants or for maintaining any records relating to the holdings of participants and their customers, and you will have to rely on the procedures of the depositary and its participants.

If an issue of debt securities is denominated in a currency other than the U.S. dollar, we will make payments of principal and any interest in the foreign currency in which the debt securities are denominated or in U.S. dollars. DTC has elected to have all payments of principal and interest paid in U.S. dollars unless notified by any of its participants through which an interest in the debt securities is held that it elects, in accordance with, and to the extent permitted by, the applicable supplement and the relevant debt security, to receive payment of principal or interest in the foreign currency. On or prior to the third business day after the record date for payment of interest and 12 days prior to the date for payment of principal, a participant will be required to notify DTC of (a) its election to receive all, or the specified portion, of payment in the foreign currency and (b) its instructions for wire transfer of payment to a foreign currency account. See “Currency Conversions and Foreign Exchange Risks Affecting Debt Securities Denominated in a Foreign Currency — Currency Conversion” below.

You will be required to make your initial payment for the debt securities in immediately available funds. Secondary market trading between DTC participants will occur in the ordinary way in accordance with DTC rules and will be settled in immediately available funds using DTC’s Same-Day Funds Settlement System. Secondary market trading between Clearstream customers and/or Euroclear participants will occur in the ordinary way in accordance with the applicable rules and operating procedures of Clearstream and Euroclear and will be settled using the procedures applicable to conventional eurobonds in immediately available funds.

Cross-market transfers between persons holding directly or indirectly through DTC, on the one hand, and directly or indirectly through Clearstream customers or Euroclear participants, on the other, will be effected in DTC in accordance with DTC rules on behalf of the relevant European international clearing system by U.S. depositary; however, such cross-market transactions will require delivery of instructions to the relevant European international clearing system by the counterparty in such system in accordance with its rules and procedures and within its established deadlines (based on European time). The relevant European international clearing system will, if the transaction meets its settlement requirements, deliver instructions to the U.S. depositary to take action to effect final settlement on its behalf by delivering or receiving debt securities in DTC, and making or receiving payment in accordance with normal procedures for same-day funds settlement applicable to DTC. Clearstream customers and Euroclear participants may not deliver instructions directly to their respective U.S. depositaries.

Because of time-zone differences, credits of debt securities received in Clearstream or Euroclear as a result of a transaction with a DTC participant will be made during subsequent securities settlement processing and dated the business day following the DTC settlement date. Such credits or any transactions in such debt securities settled during such processing will be reported to the relevant Clearstream customers or Euroclear participants on such business day. Cash received in Clearstream or Euroclear as a result of sales of debt securities by or through a Clearstream customer or a Euroclear participant to a DTC participant will be received with value on the DTC settlement date but will be available in the relevant Clearstream or Euroclear cash account only as of the business day following settlement in DTC.

Although DTC, Clearstream and Euroclear have agreed to the foregoing procedures in order to facilitate transfers of debt securities among participants of DTC, Clearstream and Euroclear, they are under no obligation to perform or continue to perform such procedures and such procedures may be discontinued at any time.

A beneficial owner of book-entry securities represented by a global security may exchange the securities for definitive (paper) securities only if:

Unless otherwise specified in connection with a particular offering of debt securities, any global security that is exchangeable will be exchangeable in whole for definitive securities in registered form, with the same terms and of an equal aggregate principal amount, in denominations of $100,000 and whole multiples of $1,000. Definitive notes will be registered in the name or names of the person or persons specified by the depositary in a written instruction to the registrar of the securities. The Depositary may base its written instruction upon directions it receives from its participants.

If any of the events described above occurs, then the beneficial owners will be notified through the chain of intermediaries that definitive debt securities are available and notice will be published as described below under “— Notices.” Beneficial owners of book-entry debt securities will then be entitled (1) to receive physical delivery in certificated form of definitive debt securities equal in principal amount to their beneficial interest and (2) to have the definitive debt securities registered in their names. Thereafter, the holders of the definitive debt securities will be recognized as the “holders” of the debt securities under the applicable indenture.

The applicable indenture provides for the replacement of a mutilated, lost, stolen or destroyed definitive debt security, so long as the applicant furnishes to Citigroup and the trustee such security or indemnity and such evidence of ownership as they may require.

In the event definitive debt securities are issued, the holders of definitive debt securities will be able to receive payments of principal and interest on their debt securities at the office of Citigroup’s paying agent maintained in the Borough of Manhattan (in the case of holders of U.S. dollar-denominated debt securities or holders of debt securities denominated in a foreign currency electing to receive payments in U.S. dollars) and in London (in the case of holders of debt securities denominated in a foreign currency not electing to receive payments in U.S. dollars) and, if the definitive debt securities are listed on the Luxembourg Stock Exchange, at the offices of the paying agent in Luxembourg. Payment of principal of a definitive debt security may be made only against surrender of the debt security to one of Citigroup’s paying agents. Citigroup also has the option of making payments of interest by mailing checks to the registered holders of the debt securities.

Unless otherwise specified in connection with a particular offering of debt securities, Citigroup’s paying agent in the Borough of Manhattan will be the corporate trust office of Citibank, N.A., located at 388 Greenwich Street, 14th Floor, New York, New York. Citigroup’s paying agent in London is Citibank, N.A. London office, located at Citigroup Centre, Canada Square, Canary Wharf, London, England. Citigroup’s paying agent and transfer agent in Luxembourg is Dexia Banque Internationale à Luxembourg S.A., currently located at 69, route d’Esch, L-2953 Luxembourg. As long as the debt securities are listed on the Luxembourg Stock Exchange and the rules of that exchange so require, Citigroup will maintain a paying agent and transfer agent in Luxembourg. Any change in the Luxembourg paying agent and transfer agent will be published in London and Luxembourg. See “— Notices” below.

In the event definitive debt securities are issued, the holders of definitive debt securities will be able to transfer their securities, in whole or in part, by surrendering the debt securities for registration of transfer at the office of Citibank, N.A., listed above and, so long as definitive debt securities are listed on the Luxembourg Stock Exchange, at the offices of the transfer agent in Luxembourg, duly endorsed by or accompanied by a written instrument of transfer in form satisfactory to Citigroup and the securities registrar. A form of such

instrument of transfer will be obtainable at the relevant office of Citibank, N.A. and the Luxembourg transfer agent. Upon surrender, Citigroup will execute, and the trustee will authenticate and deliver, new debt securities to the designated transferee in the amount being transferred, and a new debt security for any amount not being transferred will be issued to the transferor. Such new securities will be delivered free of charge at the relevant office of Citibank, N.A. or the Luxembourg transfer agent, as requested by the owner of such new debt securities. Citigroup will not charge any fee for the registration of transfer or exchange, except that it may require the payment of a sum sufficient to cover any applicable tax or other governmental charge payable in connection with the transfer.

So long as the global securities are held on behalf of DTC or any other clearing system, notices to holders of securities represented by a beneficial interest in the global securities may be given by delivery of the relevant notice to DTC or the alternative clearing system, as the case may be. In addition, so long as the securities are listed on the Luxembourg Stock Exchange, notices will also be made by publication in a leading newspaper of general circulation in Luxembourg, which is expected to be the Luxemburger Wort. Any notice will be deemed to have been given on the date of publication or, if published more than once, on the date of the first publication.

The senior debt indenture, the subordinated debt indenture and the debt securities for all purposes shall be governed by and construed in accordance with the laws of the State of New York.

Unless otherwise specified in connection with a particular offering of debt securities, all funds deposited with the relevant trustee or any paying agent for the payment of principal, interest, premium or additional amounts in respect of the debt securities that remain unclaimed for two years after the maturity date of the debt securities will be repaid to Citigroup upon its request. Thereafter, any right of any noteholder to such funds shall be enforceable only against Citigroup, and the trustee and paying agents will have no liability therefor.

Under New York’s statute of limitations, any legal action to enforce Citigroup’s payment obligations evidenced by the debt securities must be commenced within six years after payment is due. Thereafter Citigroup’s payment obligations will generally become unenforceable.

As of the date of this prospectus, under the European Council Directive 2003/48/EC on the taxation of savings income, Member States of the European Union are required to provide to the tax authorities of another Member State details of payments of interest (or similar income) paid by a person within its jurisdiction to an individual resident in that other Member State. However, for a transitional period, Luxembourg and Austria are instead required (unless during that period they elect otherwise) to operate a withholding system in relation to such payments (the ending of such transitional period being dependent upon the conclusion of certain other agreements relating to information exchange with certain other countries). A number of non-EU countries and territories have agreed to adopt similar measures (some of which involve a withholding system). As indicated above under “— Payment of Additional Amounts — Exceptions”, no additional amounts will be payable with respect to a debt security if a payment on a debt security is reduced as a result of any tax, assessment or other governmental charge that is required to be made pursuant to any European Union directive on the taxation of savings income or any law implementing or complying with, or introduced in order to conform to, any such directive. Holders should consult their tax advisers regarding the implications of the directive in their particular circumstances.

The senior debt securities will be issued under the senior debt indenture, will be unsecured obligations of Citigroup and will rank on an equal basis with all other unsecured senior indebtedness of Citigroup, whether existing at the time of issuance or created thereafter.

The subordinated debt securities will be issued under the subordinated debt indenture, will be unsecured obligations of Citigroup, will rank subordinated and junior in right of payment, to the extent set forth in the subordinated debt indenture, to all “Senior Indebtedness” (as defined below) of Citigroup and will rank equally with all other unsecured and subordinated indebtedness of Citigroup, whether existing at the time of issuance or created thereafter, other than subordinated indebtedness which is designated as junior to the subordinated debt securities.

If Citigroup defaults in the payment of any principal of, or premium, if any, or interest on any Senior Indebtedness when it becomes due and payable after any applicable grace period, then, unless and until the default is cured or waived or ceases to exist, Citigroup cannot make a payment on account of or redeem or otherwise acquire the subordinated debt securities. Nevertheless, holders of subordinated debt securities may still receive and retain:

If there is any insolvency, bankruptcy, liquidation or other similar proceeding relating to Citigroup, its creditors or its property, then all Senior Indebtedness must be paid in full before any payment may be made to any holders of subordinated debt securities. Holders of subordinated debt securities must return and deliver any payments received by them, other than in a plan of reorganization or through a defeasance trust as described below, directly to the holders of Senior Indebtedness until all Senior Indebtedness is paid in full. (Subordinated Debt Indenture, Section 14.01).

(1) the principal, premium, if any, and interest in respect of (A) indebtedness for money borrowed and (B) indebtedness evidenced by securities, notes, debentures, bonds or other similar instruments issued by Citigroup, including all indebtedness (whether now or hereafter outstanding) issued under the senior debt indenture, as the same may be amended, modified or supplemented from time to time;

(3) all obligations of Citigroup issued or assumed as the deferred purchase price of property, all conditional sale obligations of Citigroup and all obligations of Citigroup under any conditional sale or title retention agreement, but excluding trade accounts payable in the ordinary course of business;

(4) all obligations, contingent or otherwise, of Citigroup in respect of any letters of credit, bankers acceptance, security purchase facilities and similar credit transactions;

(5) all obligations of Citigroup in respect of interest rate swap, cap or other agreements, interest rate future or option contracts, currency swap agreements, currency future or option contracts and other similar agreements;

(6) all obligations of the type referred to in clauses (1) through (5) above of other persons for the payment of which Citigroup is responsible or liable as obligor, guarantor or otherwise; and

(7) all obligations of the type referred to in clauses (1) through (6) above of other persons secured by any lien on any property or asset of Citigroup whether or not such obligation is assumed by Citigroup;

(A) any indebtedness issued prior to July 23, 2004 under the subordinated debt indenture;

(B) any indebtedness issued by Citigroup under an indenture with Bank One Trust Company, N.A., dated as of July 17, 1998, as supplemented;

(C) any indebtedness issued to a Citigroup Trust before May 31, 2004 under the indenture, dated as of October 7, 1996, between Citigroup and JPMorgan Chase Bank, as supplemented (the “1996 junior subordinated debt indenture”);

(D) any guarantee entered into by Citigroup before May 31, 2004 in respect of any preferred securities, capital securities or preference stock of a Citigroup Trust to which Citigroup issued any indebtedness under the 1996 junior subordinated debt indenture; and

(E) any indebtedness or any guarantee that is by its terms subordinated to, or ranks equally with the subordinated debt securities and the issuance of which (x) has received the concurrence or approval of the staff of the Federal Reserve Bank of New York or the staff of the Board of Governors of the Federal Reserve System or (y) does not at the time of issuance prevent the subordinated debt securities from qualifying for Tier 2 capital treatment (irrespective of any limits on the amount of Citigroup’s Tier 2 capital) under the applicable capital adequacy guidelines, regulations, policies or published interpretations of the Board of Governors of the Federal Reserve System.

“Citigroup Trust” means each of Citigroup Capital III, Citigroup Capital VII, Citigroup Capital VIII, Citigroup Capital IX, Citigroup Capital X, Citigroup Capital XI, Citigroup Capital XII, Citigroup Capital XIII, Citigroup Capital XIV, Citigroup Capital XV, Citigroup Capital XVI, Citigroup Capital XVII, Citigroup Capital XVIII, Citigroup Capital XIX, Citigroup Capital XX, Citigroup Capital XXI, Citigroup Capital XXII, Citigroup Capital XXIII, Citigroup Capital XXIV, Citigroup Capital XXV, Citigroup Capital XXXII and Citigroup Capital XXXIII, each a Delaware statutory trust, or any other similar trust created for the purpose of issuing preferred securities in connection with the issuances of junior subordinated debt securities under the indenture, the junior subordinated debt indentures or the junior junior subordinated debt indentures.

Limitations on Liens. The senior debt indenture provides that Citigroup will not, and will not permit any Subsidiary to, incur, issue, assume or guarantee any indebtedness for money borrowed if such indebtedness is secured by a pledge of, lien on, or security interest in any shares of Voting Stock of any Significant Subsidiary, without providing that each series of senior debt securities and, at Citigroup’s option, any other senior indebtedness ranking equally with such series of senior debt securities, is secured equally and ratably with such indebtedness. This limitation shall not apply to indebtedness secured by a pledge of, lien on or security interest in any shares of Voting Stock of any corporation at the time it becomes a Significant Subsidiary, including any renewals or extensions of such secured indebtedness (Senior Debt Indenture, Section 5.04). The subordinated debt indenture does not contain a similar provision.

“Significant Subsidiary” means a Subsidiary, including its Subsidiaries, which meets any of the following conditions:

“Subsidiary” means any corporation of which securities entitled to elect at least a majority of the corporation’s directors shall at the time be owned, directly or indirectly, by Citigroup, and/or one or more Subsidiaries, except securities entitled to vote for directors only upon the happening of a contingency.

“Voting Stock” means capital stock, the holders of which have general voting power under ordinary circumstances to elect at least a majority of the board of directors of a corporation, except capital stock that carries only the right to vote conditioned on the happening of an event regardless of whether such event shall have happened (Senior Debt Indenture, Sections 1.02 and 5.04).

Limitations on Mergers and Sales of Assets. The indentures provide that Citigroup will not merge or consolidate with another corporation or sell other than for cash or lease all or substantially all its assets to another corporation, or purchase all or substantially all the assets of another corporation unless:

Limitations on Future Issuances of Subordinated Debt Securities under the Subordinated Debt Indenture. The subordinated debt indenture provides that any subordinated debt securities issued under the subordinated debt indenture shall either (x) be issued with the concurrence or approval of the staff of the Federal Reserve Bank of New York or the staff of the Federal Reserve System or (y) qualify at the time of issuance for Tier 2 capital treatment (irrespective of any limits on the amount of Citigroup’s Tier 2 capital) under the applicable capital adequacy guidelines, regulations, policies or published interpretations of the Federal Reserve System.

Other than the restrictions described above, the indentures do not contain any covenants or provisions that would protect holders of the debt securities in the event of a highly leveraged transaction.

Under the indentures, Citigroup and the relevant trustee can enter into supplemental indentures to establish the form and terms of any series of debt securities without obtaining the consent of any holder of debt securities.

Citigroup and the trustee may, with the consent of the holders of at least 66 2/3% in aggregate principal amount of the senior debt securities of a series or at least a majority in aggregate principal amount of the subordinated debt securities of a series, modify the applicable indenture or the rights of the holders of the securities of such series to be affected.

No such modification may, without the consent of the holder of each security so affected:

In addition, the subordinated debt indenture may not be amended without the consent of each holder of subordinated debt securities affected thereby to modify the subordination of the subordinated debt securities issued under that indenture in a manner adverse to the holders of the subordinated debt securities (Subordinated Debt Indenture, Section 13.02).

Events of default under the senior debt indenture and defaults under the subordinated debt indenture are:

Unless otherwise specified in connection with a particular offering of subordinated debt, the only events of default specified in the subordinated debt indenture are events of insolvency or bankruptcy, whether voluntary or not. There is no event of default, and accordingly there is no right of acceleration, in the case of a default in the payment of principal of, premium, if any, or interest on, subordinated debt securities, the performance of any other covenant of Citigroup in the subordinated indenture or any other default that is not also an event of default (Subordinated Debt Indenture, Sections 6.01 and 6.02).

If an event of default regarding debt securities of any series issued under the indentures should occur and be continuing, either the trustee or the holders of 25% in the principal amount of outstanding debt securities of such series may declare each debt security of that series due and payable (Section 6.02). Citigroup is required to file annually with the trustee a statement of an officer as to the fulfillment by Citigroup of its obligations under the indenture during the preceding year (Senior Debt Indenture, Section 5.06; Subordinated Debt Indenture, Section 5.04).

No event of default regarding one series of senior debt securities issued under the senior debt indenture is necessarily an event of default regarding any other series of senior debt securities (Senior Debt Indenture, Section 6.02).

Holders of a majority in principal amount of the outstanding debt securities of any series will be entitled to control certain actions of the trustee under the indentures and to waive past defaults regarding such series (Sections 6.02 and 6.06). The trustee generally will not be under any obligation to act at the request, order or direction of any of the holders of debt securities, unless one or more of such holders shall have offered to the trustee security or indemnity reasonably satisfactory to it (Section 10.01).

If an event of default occurs regarding a series of debt securities, the trustee may use any sums that it collects under the relevant indenture for its own reasonable compensation and expenses incurred prior to paying the holders of debt securities of such series (Section 6.05).

Before any holder of any series of debt securities may institute action for any remedy, except payment on such holder’s debt security when due, the holders of not less than 25% in principal amount of the debt securities of that series outstanding must request the trustee to take action. Holders must also offer security and indemnity reasonably satisfactory to the trustee against liabilities incurred by the trustee for taking such action (Section 6.07).

Senior Debt Indenture. Unless otherwise specified in connection with a particular offering of debt securities, after Citigroup has deposited with the trustee cash or U.S. government securities or, in the case of debt securities denominated in a currency other than U.S. dollars, after Citigroup has deposited with the trustee funds in the currency specified in the applicable supplement or securities of issuers specified in the applicable supplement issued in trust for the benefit of the holders sufficient to pay the principal of, premium, if any, and interest on the senior debt securities of such series when due, then Citigroup, at its option:

In the case of covenant defeasance, Citigroup must also deliver to the trustee an opinion of counsel to the effect that the holders of the senior debt securities of such series will have no United States federal income tax consequences as a result of such deposit.

When there is a defeasance and discharge, (1) the senior debt indenture will no longer govern the senior debt securities of such series, (2) Citigroup will no longer be liable for payment and (3) the holders of such senior debt securities will be entitled only to the deposited funds. When there is a covenant defeasance, however, Citigroup will continue to be obligated to make payments when due if the deposited funds are not sufficient.

The obligations and rights under the senior debt indenture regarding compensation, reimbursement and indemnification of the trustee, optional redemption, mandatory and optional scheduled installment payments, if any, registration of transfer and exchange of the senior debt securities of such series, replacement of mutilated, destroyed, lost or stolen senior debt securities and certain other administrative provisions will continue even if Citigroup exercises its defeasance and discharge or covenant defeasance options (Senior Debt Indenture, Sections 11.03 and 11.04).

Under current United States federal income tax law, defeasance and discharge should be treated as a taxable exchange of the senior debt securities for an interest in the trust. As a consequence, each holder of the senior debt securities would recognize gain or loss equal to the difference between the value of the holder’s interest in the trust and holder’s adjusted tax basis for the senior debt securities deemed exchanged, except to the extent attributable to accrued but unpaid interest, which will be taxable as ordinary income. Each holder would then be required to include in income his share of any income, gain and loss recognized by the trust. Even though United States federal income tax on the deemed exchange would be imposed on a holder, the holder would not receive any cash until the maturity or an earlier redemption of the senior debt securities, except for any current interest payments. Prospective investors are urged to consult their tax advisors as to the specific consequences of a defeasance and discharge, including the applicability and effect of tax laws other than the United States federal income tax law.

Under current United States federal income tax law, a covenant defeasance would not be treated as a taxable exchange of senior debt securities.

Subordinated Debt Indenture. Unless otherwise specified in connection with a particular offering of subordinated debt securities, the defeasance and discharge and covenant defeasance provisions contained in the subordinated debt indenture will apply and are substantially the same as those described above for the senior debt indenture (Subordinated Debt Indenture, Sections 11.01, 11.02, 11.03, 11.04 and 11.05).

Under the subordinated debt indenture, Citigroup must also deliver to the trustee an opinion of counsel to the effect that the holders of the subordinated debt securities will not recognize income, gain or loss for United States federal income tax purposes as a result of such deposit and defeasance and discharge or covenant defeasance and that United States federal income tax would be imposed on the holders in the same manner as if such defeasance and discharge had not occurred. In the case of a defeasance and discharge, such opinion must be based upon a ruling or administrative pronouncement of the Internal Revenue Service.

Citigroup has had and may continue to have banking relationships with the trustees in the ordinary course of business.

The following discussion of United States tax documentation requirements does not deal with all aspects of United States federal income tax withholding or reporting that may be relevant to a beneficial owner of the debt securities. Investors should consult their tax advisors for specific advice concerning the acquisition, ownership and disposition of the debt securities.

A 30% United States federal withholding tax will generally apply to payments of interest on the debt securities to a non-United States person, unless such beneficial owner of a debt security takes one of the following steps to obtain an exemption from or reduction of the tax. The 30% tax, however, may be allowed as a refund or credit against the beneficial owner’s United States federal income tax liability. In addition, if a beneficial owner of a debt security does not properly provide the required documentation, or if such documentation is not properly transmitted to and received by the United States person required to withhold United States federal income tax, the beneficial owner could, in certain circumstances, be subject to a backup withholding tax (currently at a rate of 28%) and will not be entitled to any additional amounts from Citigroup described under “Description of Debt Securities — Payment of Additional Amounts” above.

(1) Non-United States Persons. A beneficial owner of a debt security that is a non-United States person can obtain an exemption from the withholding tax by providing a properly completed Internal Revenue Service (“IRS”) Form W-8BEN. This exemption is not available to:

(2) Non-United States Persons with Effectively Connected Income. A beneficial owner of a debt security that is a non-United States person, including a non-United States corporation or bank with a United States branch, that conducts a trade or business in the United States with which the interest income on a debt security is effectively connected, can obtain an exemption from the withholding tax by providing a properly completed IRS Form W-8ECI.

(3) Non-United States Persons Entitled to Income Tax Treaty Benefits. A beneficial owner of a debt security that is a non-United States person entitled to the benefits of an income tax treaty to which the United States is a party can obtain an exemption from or reduction of the withholding tax by providing a properly completed IRS Form W-8BEN. The availability and extent of such exemption, however, will depend upon the terms of the particular income tax treaty.

(4) United States Persons. A beneficial owner of a debt security that is a United States person and is not otherwise exempt from backup withholding can obtain an exemption from the withholding tax by providing a properly completed IRS Form W-9.

Beneficial Owners. A beneficial owner of a debt security is required to submit the appropriate IRS form under applicable procedures to the person through which the owner directly holds the debt security. For example, if the beneficial owner is listed directly on the books of Euroclear or Clearstream as the owner of the debt security, the IRS form must be provided to Euroclear or Clearstream, as the case may be.

Non-United States Persons Through Which Debt Securities are Held. A non-United States person through which a debt security is held (e.g., a securities clearing organization, a bank, a financial institution, a custodian, a broker, a nominee, or any other person that acts as an agent for a beneficial owner of a debt security or otherwise holds the debt security on its behalf) generally must submit IRS Form W-8IMY to the person from which it receives payments of interest on the debt security, and may also be required to submit the IRS form of the beneficial owner of the debt security to such person and comply with other applicable procedures. Non-United States persons through which debt securities are held should consult their tax advisors regarding the tax documentation requirements applicable to them in their particular circumstances.

Special Rules May Apply if the Debt Securities are Held by a Foreign Partnership. In the event that the debt securities are held by a foreign partnership, special rules may apply in order that payments made on the debt securities will not be subject to United States federal withholding tax. Holders should consult their tax advisors with respect to the tax consequences to them of the ownership and disposition of the debt securities through a foreign partnership.

The following is a general summary of United States federal income tax considerations that may be relevant to a beneficial owner of a debt security. The summary is based on:

all of which may change, possibly with retroactive effect. This summary deals only with beneficial owners that will hold debt securities as capital assets. This summary does not address all of the United States federal income tax considerations that may be relevant to a beneficial owner of debt securities. For example, this summary does not address tax considerations applicable to investors to whom special tax rules may apply, including:

Any special United States federal income tax considerations relevant to a particular issue of debt securities, including any indexed notes, floating rate notes, dual currency notes or notes providing for contingent payments, will be provided in the applicable supplement. Purchasers of such notes should carefully examine the applicable supplement and should consult with their tax advisors with respect to such notes.

Prospective investors should consult their tax advisors in determining the tax consequences to them of purchasing, holding, and disposing of the debt securities, including the application to their particular situation of the United States federal income tax considerations discussed below, as well as the application of state, local, foreign or other tax laws.

As used in this summary, the term “United States holder” means a beneficial owner of a debt security who is a United States person. The term “non-United States holder” means a beneficial owner of a debt security who is not a United States holder.

Payments of qualified stated interest, as defined below under “Original Issue Discount,” on a debt security will be taxable to a United States holder as ordinary interest income at the time that such payments are accrued or are received, in accordance with the United States holder’s method of tax accounting.

If such payments of interest are made in foreign currency with respect to a debt security that is denominated in such foreign currency, the amount of interest income realized by a United States holder that uses the cash method of tax accounting will be the U.S. dollar value of the specified currency payment based on the spot rate of exchange on the date of receipt regardless of whether the payment is in fact converted into U.S. dollars. No exchange gain or loss will be recognized with respect to the receipt of such payment (other than exchange gain or loss realized on the disposition of the foreign currency so received, see “Transactions in Foreign Currency”, below). A United States holder of DTC debt securities that uses the cash method of tax accounting and receives a payment of interest in U.S. dollars should include in income the amount of U.S. dollars received. A United States holder that uses the accrual method of tax accounting will accrue interest income on the foreign currency debt security in the relevant foreign currency and translate the amount accrued into U.S. dollars based on:

Such election must be applied consistently by the United States holder to all debt instruments from year to year and can be changed only with the consent of the IRS. A United States holder that uses the accrual method of tax accounting will recognize foreign currency gain or loss on the receipt of an interest payment made relating to a foreign currency debt security if the spot rate of exchange on the date the payment is received differs from the rate applicable to a previous accrual of that interest income. Such foreign currency gain or loss will be treated as ordinary income or loss, but generally will not be treated as an adjustment to interest income received on the debt securities.

A United States holder’s tax basis in a debt security generally will equal the cost of such debt security to such holder

In the case of a foreign currency debt security, the cost of such debt security to a United States holder will generally be the U.S. dollar value of the foreign currency purchase price on the date of purchase calculated at the spot rate of exchange on that date. In the case of a foreign currency debt security that is traded on an established securities market, a United States holder generally should determine the U.S. dollar value of the cost of such debt security by translating the amount paid in foreign currency into its U.S. dollar value at the spot rate of exchange (i) on the settlement date of the purchase in the case of a United States holder using the cash method of tax accounting or (ii) on the trade date, in the case of a United States holder using the accrual method of tax accounting, unless such holder elects to use the spot rate applicable to cash method United States holders. The amount of any subsequent adjustments to a United States holder’s tax basis in a foreign currency debt security in respect of OID, market discount and premium will be determined in the manner described under “Original Issue Discount,” “Market Discount” and “Debt Securities Purchased at a Premium” below. The conversion of U.S. dollars to another specified currency and the immediate use of such specified currency to purchase a foreign currency debt security generally will not result in any exchange gain or loss for a United States holder.

Upon the sale, exchange, retirement or other taxable disposition (collectively, a “disposition”) of a debt security, a United States holder generally will recognize gain or loss equal to the difference between (i) the amount realized on the disposition, less any accrued qualified stated interest, which will be taxable as ordinary income in the manner described above under “Payments of Interest,” and (ii) the United States holder’s adjusted tax basis in such debt security. If a United States holder receives a specified currency other than the U.S. dollar in respect of such disposition of a debt security, the amount realized will be the U.S. dollar value of the specified currency received calculated at the spot rate of exchange on the date of disposition of the debt security.

In the case of a foreign currency debt security that is traded on an established securities market, a United States holder that receives a specified currency other than the U.S. dollar in respect of such disposition generally should determine the amount realized (as determined on the trade date) by translating that specified currency into its U.S. dollar value at the spot rate of exchange (i) on the settlement date of the disposition in the case of a United States holder using the cash method of tax accounting or (ii) on the trade date, in the case of a United States holder using the accrual method of tax accounting, unless such holder elects to use the spot rate applicable to cash method United States holders. The election available to accrual basis United States holders in respect of the purchase and sale of foreign currency debt securities traded on an established securities market, discussed above, must be applied consistently by the United States holder to all debt instruments from year to year and can be changed only with the consent of the IRS.

Except as discussed below in connection with foreign currency gain or loss, market discount and short-term debt securities, gain or loss recognized by a United States holder on the disposition of a debt security will generally be long term capital gain or loss if the United States holder’s holding period for the debt security exceeds one year at the time of such disposition.

Gain or loss recognized by a United States holder on the disposition of a foreign currency debt security generally will be treated as ordinary income or loss to the extent that the gain or loss is attributable to changes in exchange rates during the period in which the holder held such debt security.

Foreign currency received as interest on, or on a disposition of, a debt security will have a tax basis equal to its U.S. dollar value at the time such interest is received or at the time such proceeds are received. The amount of

gain or loss recognized on a sale or other disposition of such foreign currency will be equal to the difference between (i) the amount of U.S. dollars, or the fair market value in U.S. dollars of the other property received in such sale or other disposition, and (ii) the United States holder’s tax basis in such foreign currency.

A United States holder that purchases a debt security with previously owned foreign currency will generally recognize gain or loss in an amount equal to the difference, if any, between such holder’s tax basis in such foreign currency and the U.S. dollar fair market value of such debt security on the date of purchase. Any such gain or loss generally will be ordinary income or loss and will not be treated as interest income or expense. The conversion of U.S. dollars to foreign currency and the immediate use of such currency to purchase a debt security generally will not result in any exchange gain or loss for a United States holder.

In General. Debt securities with a term greater than one year may be issued with OID for United States federal income tax purposes. Such debt securities are called OID debt securities in this prospectus. United States holders generally must accrue OID in gross income over the term of the OID debt securities on a constant yield basis, regardless of their regular method of tax accounting. As a result, United States holders generally will recognize taxable income in respect of an OID debt security in advance of the receipt of cash attributable to such income.

OID generally will arise if the stated redemption price at maturity of the debt security exceeds its issue price by more than a de minimis amount of 0.25% of the debt security’s stated redemption price at maturity multiplied by the number of complete years to maturity. OID may also arise if a debt security has particular interest payment characteristics, such as interest holidays, interest payable in additional securities or stepped interest. For this purpose, the issue price of a debt security is the first price at which a substantial amount of debt securities is sold for cash, other than to bond houses, brokers or similar persons or organizations acting in the capacity of underwriters, placement agents or wholesalers. The stated redemption price at maturity of a debt security is the sum of all payments due under the debt security, other than payments of qualified stated interest. The term qualified stated interest generally means stated interest that is unconditionally payable in cash or property, other than debt instruments of the issuer, at least annually during the entire term of the OID debt security at a single fixed rate of interest or, under particular conditions, based on one or more interest indices.

For each taxable year of a United States holder, the amount of OID that must be included in gross income in respect of an OID debt security will be the sum of the daily portions of OID for each day during such taxable year or any portion of such taxable year in which such a United States holder held the OID debt security. Such daily portions are determined by allocating to each day in an accrual period a pro rata portion of the OID allocable to that accrual period. Accrual periods may be of any length and may vary in length over the term of an OID debt security. However, accrual periods may not be longer than one year and each scheduled payment of principal or interest must occur on the first day or the final day of a period.

The amount of OID allocable to any accrual period generally will equal (i) the product of the OID debt security’s adjusted issue price at the beginning of such accrual period multiplied by its yield to maturity (as adjusted to take into account the length of such accrual period), less (ii) the amount, if any, of qualified stated interest allocable to that accrual period. The adjusted issue price of an OID debt security at the beginning of any accrual period will equal the issue price of the OID debt security, as defined above, (i) increased by previously accrued OID from prior accrual periods, and (ii) reduced by any payment made on such debt security, other than payments of qualified stated interest, on or before the first day of the accrual period. The yield to maturity of an OID debt security is the discount rate (appropriately adjusted to reflect the length of accrual periods) that causes the present value on the issue date of all payments on the OID debt security to equal the issue price. In the case of an OID debt security that is a floating rate debt security, both the yield to maturity and the qualified stated interest will be determined for these purposes as though the OID debt security will bear interest in all periods at a fixed rate generally equal to the value, as of the issue date, of the floating interest rate on the OID debt security or, in the case of some floating rate debt securities, the rate that reflects the yield that is reasonably expected for the OID debt security. (Additional rules may apply if interest on a floating rate debt security is based on more than one interest index.)

Foreign Currency Debt Securities. In the case of an OID debt security that is also a foreign currency debt security, a United States holder should determine the U.S. dollar amount includible in income as OID for each accrual period by

All payments on an OID debt security, other than payments of qualified stated interest, will generally be viewed first as payments of previously accrued OID, to the extent thereof, with payments attributed first to the earliest accrued OID, and then as payments of principal. Upon the receipt of an amount attributable to OID, whether in connection with a payment of an amount that is not qualified stated interest or the disposition of the OID debt security, a United States holder will recognize ordinary income or loss measured by the difference between (i1) the amount received and (ii) the amount accrued. The amount received will be translated into U.S. dollars at the spot rate of exchange on the date of receipt or on the date of disposition of the OID debt security. The amount accrued will be determined by using the spot rate of exchange applicable to such previous accrual.

Acquisition Premium. A United States holder that purchases an OID debt security for an amount less than or equal to the remaining redemption amount, but in excess of the OID debt security’s adjusted issue price, generally is permitted to reduce the daily portions of OID by a fraction. The numerator of such fraction is the excess of the United States holder’s adjusted tax basis in the OID debt security immediately after its purchase over the OID debt security’s adjusted issue price. The denominator of such fraction is the excess of the remaining redemption amount over the OID debt security’s adjusted issue price. For purposes of this prospectus,

The debt securities may have special redemption, repayment or interest rate reset features, as indicated in the applicable supplement. Debt securities containing such features, in particular OID debt securities, may be subject to special rules that differ from the general rules discussed above. Accordingly, purchasers of debt securities with such features should carefully examine the applicable supplement, and should consult their tax advisors relating to such debt securities.

If a United States holder purchases a debt security, other than a short-term debt security, for an amount that is less than the debt security’s stated redemption price at maturity or, in the case of an OID debt security, for an amount that is less than the debt security’s revised issue price, i.e., the debt security’s issue price increased by the amount of accrued OID, the debt security will be considered to have market discount. The market discount rules are subject to a de minimis rule similar to the rule relating to de minimis OID, described above (in the second paragraph under “Original Issue Discount”). Any gain recognized by the United States holder on the disposition of debt securities having market discount generally will be treated as ordinary income to the extent of the market discount that accrued on the debt security while held by such United States holder.

Alternatively, the United States holder may elect to include market discount in income currently over the life of the debt security. Such an election will apply to market discount debt securities acquired by the United States holder on or after the first day of the first taxable year to which such election applies and is revocable only with the consent of the IRS. Market discount will accrue on a straight-line basis unless the United States holder elects to accrue the market discount on a constant-yield method. Such an election will apply to the debt security to which it is made and is irrevocable. Unless the United States holder elects to include market

discount in income on a current basis, as described above, the United States holder could be required to defer the deduction of a portion of the interest paid on any indebtedness incurred or maintained to purchase or carry the debt security.

Market discount on a foreign currency debt security will be accrued by a United States holder in the specified currency. The amount includible in income by a United States holder in respect of such accrued market discount will be the U.S. dollar value of the amount accrued. This is generally calculated at the spot rate of exchange on the date that the debt security is disposed of by the United States holder. Any accrued market discount on a foreign currency debt security that is currently includible in income will be translated into U.S. dollars at the average exchange rate for the accrual period or portion of such accrual period within the United States holder’s taxable year.

The rules set forth above also will generally apply to debt securities having maturities of not more than one year from the date of issuance. Those debt securities are called short-term debt securities in this prospectus. Modifications apply to these general rules.

First, none of the interest on a short-term debt security is treated as qualified stated interest but instead is treated as part of the short-term debt security’s stated redemption price at maturity, thereby giving rise to OID. Thus, all short-term debt securities will be OID debt securities. OID will be treated as accruing on a short-term debt security ratably, or at the election of a United States holder, under a constant yield method.

Second, a United States holder of a short-term debt security that uses the cash method of tax accounting will generally not be required to include OID in respect of the short-term debt security in income on a current basis. Such a United States holder may not be allowed to deduct all of the interest paid or accrued on any indebtedness incurred or maintained to purchase or carry such debt security until the maturity of the debt security or its earlier disposition in a taxable transaction. In addition, such a United States holder will be required to treat any gain realized on a disposition of the debt security as ordinary income to the extent of the holder’s accrued OID on the debt security, and short-term capital gain to the extent the gain exceeds accrued OID. A United States holder of a short-term debt security using the cash method of tax accounting may, however, elect to accrue OID into income on a current basis. In such case, the limitation on the deductibility of interest described above will not apply. A United States holder using the accrual method of tax accounting and some cash method holders generally will be required to include OID on a short-term debt security in income on a current basis.

Third, any United States holder of a short-term debt security, whether using the cash or accrual method of tax accounting, can elect to accrue the acquisition discount, if any, on the debt security on a current basis. If such an election is made, the OID rules will not apply to the debt security. Acquisition discount is the excess of the debt security’s stated redemption price at maturity over the holder’s purchase price for the debt security. Acquisition discount will be treated as accruing ratably or, at the election of the United States holder, under a constant-yield method based on daily compounding.

As described above, the debt securities may have special redemption features. These features may affect the determination of whether a debt security has a maturity of not more than one year and thus is a short-term debt security. Purchasers of debt securities with such features should carefully examine the applicable supplement, and should consult their tax advisors in relation to such features.

A United States holder that purchases a debt security for an amount in excess of the remaining redemption amount will be considered to have purchased the debt security at a premium and the OID rules will not apply to such holder. Such holder may elect to amortize such premium, as an offset to interest income, using a constant-yield method, over the remaining term of the debt security. Such election, once made, generally applies to all debt instruments held by the United States holder at the beginning of the first taxable year to which the election applies and to all debt instruments subsequently acquired by the United States

holder. Such election may be revoked only with the consent of the IRS. A United States holder that elects to amortize such premium must reduce its tax basis in a debt security by the amount of the premium amortized during its holding period. For a United States holder that does not elect to amortize bond premium, the amount of such premium will be included in the United States holder’s tax basis when the debt security matures or is disposed of by the United States holder. Therefore, a United States holder that does not elect to amortize premium and holds the debt security to maturity will generally be required to treat the premium as capital loss when the debt security matures.

Amortizable bond premium in respect of a foreign currency debt security will be computed in the specified currency and will reduce interest income in the specified currency. At the time amortized bond premium offsets interest income, exchange gain or loss, which will be taxable as ordinary income or loss, will be realized on the amortized bond premium on such debt security based on the difference between (i) the spot rate of exchange on the date or dates such premium is recovered through interest payments on the debt security and (ii) the spot rate of exchange on the date on which the United States holder acquired the debt security. See “Original Issue Discount — Acquisition Premium” above for a discussion of the treatment of a debt security purchased for an amount less than or equal to the remaining redemption amount but in excess of the debt security’s adjusted issue price.

Information returns may be required to be filed with the IRS relating to payments made to particular United States holders of debt securities. In addition, United States holders may be subject to a backup withholding tax on such payments if they do not provide their taxpayer identification numbers to the trustee in the manner required, fail to certify that they are not subject to backup withholding tax, or otherwise fail to comply with applicable backup withholding tax rules. United States holders may also be subject to information reporting and backup withholding tax with respect to the proceeds from a disposition of the debt securities. Any amounts withheld under the backup withholding rules will be allowed as a credit against the United States holder’s United States federal income tax liability provided the required information is timely furnished to the IRS.

Despite the above, if a non-United States holder is engaged in a trade or business in the United States (and, if certain tax treaties apply, the non-United States holder maintains a permanent establishment within the United States) and the interest on the debt securities is effectively connected with the conduct of that trade or business (and, if certain tax treaties apply, attributable to that permanent establishment), such non-United States holder will be subject to United States federal income tax on the interest on a net income basis in the same manner as if such non-United States holder were a United States holder. In addition, a non-United States holder that is a foreign corporation engaged in a trade or business in the United States may be subject to a 30% (or, such lower rates if certain tax treaties apply) branch profits tax.

Any gain realized on the disposition of a debt security generally will not be subject to United States federal income tax unless:

In general, backup withholding and information reporting will not apply to a payment of interest on a debt security to a non-United States holder, or to proceeds from the disposition of a debt security by a non-United States holder, in each case, if the holder certifies under penalties of perjury that it is a non-United States holder and neither Citigroup nor its paying agent has actual knowledge, or reason to know, to the contrary. Any amounts withheld under the backup withholding rules will be refunded or credited against the non-United States holder’s United States federal income tax liability provided the required information is timely furnished to the IRS. In certain circumstances, if a debt security is not held through a qualified intermediary, the amount of payments made on such debt security, the name and address of the beneficial owner and the amount, if any, of tax withheld may be reported to the IRS.

Unless otherwise specified in connection with a particular offering of debt securities, debt securities denominated in a foreign currency which are offered and sold in the United States (“DTC debt securities”) will be represented by beneficial interests in fully registered permanent global debt securities (“DTC global debt securities”) which will be deposited with Citibank, N.A. London office, as custodian for, and registered in the name of Cede & Co., as nominee for, DTC. While interests in the DTC debt securities are held through the DTC global debt securities, all payments in respect of such debt securities will be made in U.S. dollars, except as otherwise provided in this section, in “Description of Debt Securities — Book-Entry Procedures and Settlement” above or in the applicable supplement.

As determined by the exchange agent under the terms of the fiscal agency agreement, in accordance with reasonable market practice, the amount of U.S. dollars payable in respect of any particular payment under the DTC debt securities will be equal to the amount of the relevant foreign currency/ U.S.$ rate of exchange prevailing as of 11:00 a.m. (London time) on the day which is two Business Days prior to the relevant payment date, less any costs incurred by the exchange agent for such conversion (to be shared pro rata among the holders of DTC debt securities accepting U.S. dollar payments in the proportion of their respective holdings), all in accordance with the fiscal agency agreement. If an exchange rate bid quotation is not available, the exchange agent shall obtain a bid quotation from a leading foreign exchange bank in London selected by the exchange agent for such purpose after consultation with Citigroup. If no bid quotation from a leading foreign exchange bank is available, payment will be in the relevant foreign currency to the account or accounts specified by DTC to the exchange agent. For purposes of this paragraph, a “Business Day” is a day on which commercial banks and foreign exchange markets settle payments in each of New York City and London.

Notwithstanding the above and unless otherwise specified in connection with a particular offering of debt securities, the holder of a beneficial interest in the DTC debt securities may elect to receive payments under such DTC debt securities in the relevant foreign currency by notifying the DTC participant through which its debt securities are held on or prior to the applicable record date of (1) such investor’s election to receive all or a portion of such payment in the relevant foreign currency and (2) wire instructions to a relevant foreign currency account outside the United States. DTC must be notified of such election and wire transfer instructions on or prior to the third New York business day after such record date for any payment of interest and on or prior to the

twelfth day prior to the payment of principal. DTC will notify the fiscal agent and the paying agent of such election and wire transfer instructions on or prior to 5:00 p.m. New York City time on the fifth New York business day after such record date for any payment of interest and on or prior to 5:00 p.m. New York City time on the tenth day prior to the payment of principal. For purposes of this paragraph, “New York business day” means any day other than a Saturday or Sunday or a day on which banking institutions in New York City are authorized or required by law or executive order to close.

If complete instructions are forwarded to DTC through DTC participants and by DTC to the fiscal agent and the paying agent on or prior to such dates, such holder will receive payment in the relevant foreign currency outside DTC; otherwise, only U.S. dollar payments will be made by the fiscal agent to DTC, unless otherwise specified in connection with a particular offering of debt securities. All costs of such payment by wire transfer will be borne by holders of beneficial interests receiving such payments by deduction from such payments.

Although DTC has agreed to the foregoing procedures, it is under no obligation to perform or continue to perform these procedures, and these procedures may be modified or discontinued at any time.

Holders of the debt securities will be subject to foreign exchange risks as to payments of principal and interest that may have important economic and tax consequences to them. For further information as to such consequences, see “— Foreign Exchange Risks” below.

The debt securities will be governed by, and construed in accordance with, the laws of New York State. Courts in the United States customarily have not rendered judgments for money damages denominated in any currency other than the U.S. dollar. A 1987 amendment to the Judiciary Law of New York State provides, however, that an action based upon an obligation denominated in a currency other than U.S. dollars will be rendered in the foreign currency of the underlying obligation. Any judgment awarded in such an action will be converted into U.S. dollars at the rate of exchange prevailing on the date of the entry of the judgment or decree.

An investment in debt securities which are denominated in, and all payments in respect of which are to be made in, a currency other than the currency of the country in which the purchaser is a resident or the currency in which the purchaser conducts its business or activities (the “home currency”) entails significant risks that are not associated with a similar investment in a security denominated in the home currency. Such risks include, without limitation, the possibility of significant changes in the rates of exchange between the home currency and the relevant foreign currency and the possibility of the imposition or modification of foreign exchange controls with respect to the relevant foreign currency. Such risks generally depend on economic and political events over which Citigroup has no control. In recent years, rates of exchange for foreign currencies have been volatile and such volatility may be expected to continue in the future. Fluctuations in any particular exchange rate that have occurred in the past are not necessarily indicative, however, of fluctuations in such rate that may occur during the term of the debt securities. Depreciation of the relevant foreign currency against the relevant home currency could result in a decrease in the effective yield of such relevant foreign denominated debt security below its coupon rate and, in certain circumstances, could result in a loss to the investor on a home currency basis.

This description of foreign currency risks does not describe all the risks of an investment in debt securities denominated in a currency other than the home currency. Prospective investors should consult with their financial and legal advisors as to the risks involved in an investment in a particular offering of debt securities.

The following briefly summarizes the material terms and provisions of the common stock warrants. You should read the particular terms of the common stock warrants that are offered by Citigroup, which will be described in more detail in a supplement. The supplement will also state whether any of the general provisions summarized below do not apply to the common stock warrants being offered. The supplement may add, update or change the terms and conditions of the common stock warrants as described in this prospectus.

Citigroup may offer common stock warrants pursuant to which it may sell or purchase common stock. Common stock warrants may be issued independently or together with any securities and may be attached to or separate from those securities. The common stock warrants will be issued under common stock warrant agreements to be entered into between Citigroup and a bank or trust company, as common stock warrant agent. Except as otherwise stated in a supplement, the common stock warrant agent will act solely as the agent of Citigroup under the applicable common stock warrant agreement and will not assume any obligation or relationship of agency or trust for or with any owners of common stock warrants. A copy of the form of common stock warrant agreement, including the form of common stock warrant certificate, will be filed as an exhibit to a document incorporated by reference in the registration statement of which this prospectus forms a part. You should read the more detailed provisions of the common stock warrant agreement and the common stock warrant certificate for provisions that may be important to you.

The particular terms of each issue of common stock warrants, the common stock warrant agreement relating to the common stock warrants and the common stock warrant certificates representing common stock warrants will be described in the applicable supplement, including, as applicable:

Holders of common stock warrants will not be entitled, solely by virtue of being holders, to vote, to consent, to receive dividends, to receive notice as stockholders with respect to any meeting of stockholders for the election of directors or any other matter, or to exercise any rights whatsoever as a holder of the common stock purchasable upon exercise of the common stock warrants.

If at any time there is a merger or consolidation involving Citigroup or a sale, transfer, conveyance, other than lease, or other disposition of all or substantially all of the assets of Citigroup, then the assuming corporation will succeed to the obligations of Citigroup under the common stock warrant agreement and the related common stock warrants. Citigroup will then be relieved of any further obligation under the common stock warrant agreement and common stock warrants.

The following briefly summarizes the material terms and provisions of the index warrants, other than pricing and related terms disclosed in the accompanying supplement. You should read the particular terms of the index warrants that are offered by Citigroup, which will be described in more detail in a supplement. The supplement will also state whether any of the general provisions summarized below do not apply to the index warrants being offered.

Index warrants may be issued independently or together with debt securities and may be attached to, or separate from, any such offered securities. Each series of index warrants will be issued under a separate index warrant agreement to be entered into between Citigroup and a bank or trust company, as index warrant agent. A single bank or trust company may act as index warrant agent for more than one series of index warrants. The index warrant agent will act solely as the agent of Citigroup under the applicable index warrant agreement and will not assume any obligation or relationship of agency or trust for or with any owners of index warrants. A copy of the form of index warrant agreement, including the form of certificate or global certificate that will represent the index warrant certificate, will be filed as an exhibit to a document incorporated by reference in the registration statement of which this prospectus forms a part. You should read the more detailed provisions of the index warrant agreement and the index warrant certificate or index warrant global certificate for provisions that may be important to you.

The index warrant agreement does not limit the number of index warrants that may be issued. Citigroup will have the right to “reopen” a previous series of index warrants by issuing additional index warrants of such series.

Each index warrant will entitle the warrant holder to receive from Citigroup, upon exercise, cash or securities. The amount in cash or number of securities will be determined by referring to an index calculated on the basis of prices, yields, levels or other specified objective measures in respect of:

The supplement for a series of index warrants will describe the formula or methodology to be applied to the relevant index or indices to determine the amount payable or distributable on the index warrants.

If so specified in the supplement, the index warrants will entitle the warrant holder to receive from Citigroup a minimum or maximum amount upon automatic exercise at expiration or the happening of any other event described in the supplement.

The index warrants will be deemed to be automatically exercised upon expiration. Upon such automatic exercise, warrant holders will be entitled to receive the cash amount or number of securities due, if any, on such exercise.

You should read the supplement applicable to a series of index warrants for any circumstances in which the payment or distribution or the determination of the payment or distribution on the index warrants may be postponed or exercised early or cancelled. The amount due after any such delay or postponement, or early exercise or cancellation, will be described in the applicable supplement.

Unless otherwise specified in connection with a particular offering of index warrants, Citigroup will not purchase or take delivery of or sell or deliver any securities or currencies, including the underlying assets, other than the payment of any cash or distribution of any securities due on the index warrants, from or to warrant holders pursuant to the index warrants.

The applicable supplement relating to a series of index warrants will describe the following:

Prospective purchasers of index warrants should be aware of special United States federal income tax considerations applicable to instruments such as the index warrants. The supplement relating to each series of index warrants will describe these tax considerations. The summary of United States federal income tax considerations contained in the supplement will be presented for informational purposes only, however, and will not be intended as legal or tax advice to prospective purchasers. You are urged to consult your tax advisors before purchasing any index warrants.

Unless otherwise specified in connection with a particular offering of index warrants, the index warrants will be listed on a national securities exchange or with a self-regulatory organization, in each case as specified in the supplement. It is expected that such organization will stop trading a series of index warrants as of the close of business on the related expiration date of such index warrants.

The index warrant agreement and the terms of the related index warrants may be amended by Citigroup and the index warrant agent, without the consent of the holders of any index warrants, for any of the following purposes:

Citigroup and the index warrant agent also may modify or amend the index warrant agreement and the terms of the related index warrants, with the consent of the holders of not less than a majority of the then outstanding warrants of each series affected by such modification or amendment, for any purpose. However, no such modification or amendment may be made without the consent of each holder affected thereby if such modification or amendment:

If at any time there is a merger or consolidation involving Citigroup or a sale, transfer, conveyance, other than lease, or other disposition of all or substantially all of the assets of Citigroup, then the assuming corporation will succeed to the obligations of Citigroup under the index warrant agreement and the related index warrants. Citigroup will then be relieved of any further obligation under the index warrant agreement and index warrants.

Any warrant holder may, without the consent of the index warrant agent or any other warrant holder, enforce by appropriate legal action on its own behalf his right to exercise, and to receive payment for, its index warrants.

As of the date of this prospectus, Citigroup’s authorized capital stock consists of 6 billion shares of common stock and 30 million shares of preferred stock. The following briefly summarizes the material terms of Citigroup’s common stock and outstanding preferred stock. You should read the more detailed provisions of Citigroup’s certificate of incorporation and the certificate of designation relating to a series of preferred stock for provisions that may be important to you.

As of May 9, 2011, Citigroup had outstanding approximately 2.906 billion shares of its common stock. Each holder of common stock is entitled to one vote per share for the election of directors and for all other matters to be voted on by Citigroup’s stockholders. Except as otherwise provided by law, the holders of shares of common stock vote as one class. Holders of common stock may not cumulate their votes in the election of directors, and are entitled to share equally in the dividends that may be declared by the board of directors, but only after payment of dividends required to be paid on outstanding shares of preferred stock.

Upon voluntary or involuntary liquidation, dissolution or winding up of Citigroup, the holders of the common stock share ratably in the assets remaining after payments to creditors and provision for the preference of any preferred stock. There are no preemptive or other subscription rights, conversion rights or redemption or scheduled installment payment provisions relating to shares of common stock. All of the outstanding shares of common stock are fully paid and nonassessable. The transfer agent and registrar for the common stock is Computershare Trust Company, N.A. The common stock is listed on the NYSE under the symbol “C.”

The general terms of Citigroup’s preferred stock are described below under “Description of Preferred Stock.”

As of the date of this prospectus, Citigroup had outstanding the following series of preferred stock with the following terms:

Where the above table indicates that the holders of the preferred stock have no general voting rights, this means that they do not vote on matters submitted to a vote of the common stockholders. However, the holders of this preferred stock do have other special voting rights (1) that are required by Delaware law, (2) that apply if

there is a default in paying dividends for the equivalent of six calendar quarters, in some cases whether or not consecutive and (3) when Citigroup wants to create any class of stock having a preference as to dividends or distributions of assets over such series or alter or change the provisions of the certificate of incorporation so as to adversely affect the powers, preferences or rights of the holders of such series. These special voting rights apply to all series of preferred stock listed above.

Important Provisions of Citigroup’s Certificate of Incorporation and By-Laws

Business Combinations. The certificate of incorporation generally requires the affirmative vote of at least a majority of the votes cast affirmatively or negatively by the holders of the then outstanding shares of voting stock, voting together as a single class, to approve any merger or other business combination between Citigroup and any interested stockholder, unless (1) the transaction has been approved by a majority of the continuing directors of Citigroup or (2) minimum price, form of consideration and procedural requirements are satisfied. An “interested stockholder” as defined in the certificate of incorporation generally means a person who owns at least 25% of the voting stock of Citigroup or who is an affiliate or associate of Citigroup and owned at least 25% of the voting stock of Citigroup at any time during the prior two years. A “continuing director”, as defined in the certificate of incorporation, generally means a director who is not related to an interested stockholder and held that position before an interested stockholder became an interested stockholder.

Amendments to Certificate of Incorporation and By-Laws. The affirmative vote of the holders of at least a majority of the voting power of the shares entitled to vote is required to amend the provisions of the certificate of incorporation relating to the issuance of preferred stock or common stock. Amendments of provisions of the certificate of incorporation relating to business combinations generally require a vote of the holders of at least a majority of the then outstanding shares of voting stock. The board of directors, at any meeting, may alter or amend the by-laws upon the affirmative vote of at least 66 2/3% of the entire board of directors.

Vacancies. Vacancies on the board of directors resulting from an increase in the number of directors may be filled by a majority of the board of directors then in office, so long as a quorum is present. Any other vacancies on the board of directors may be filled by a majority of the directors then in office, even if less than a quorum. Any director elected to fill a vacancy that did not result from increasing the size of the board of directors shall hold office for a term coinciding with the predecessor director’s remaining term.

On June 9, 2009, the board of directors of Citigroup adopted a Tax Benefits Preservation Plan (the “Plan”) and on May 9, 2011, certain adjustments were made to the terms of the Plan pursuant to an adjustment mechanism set forth in the Plan. The purpose of the Plan is to protect Citigroup’s ability to utilize certain tax assets, such as net operating loss carry-forwards and tax credits, to offset future income. Citigroup’s use of such tax assets in the future could be significantly limited if it experiences an “ownership change” for U.S. federal income tax purposes.

In connection with the adoption of the Plan, Citigroup’s board of directors declared a dividend of one preferred stock purchase right (a “Right”) for each outstanding share of Citigroup’s common stock.

Each Right represents the right to purchase, for $200.00 (the “Purchase Price”), one one-millionth of a share of Series R preferred stock. Each share of Series R preferred stock, if issued, will (i) not be redeemable, (ii) entitle holders to receive, when, as and if declare by Citigroup’s board of directors, quarterly dividend payment of $1.00 per share of Series R preferred stock or an amount equal to one million times the dividend paid on one share of Citigroup’s common stock (other than dividend payable in shares of the common stock), whichever is greater, (iii) have the same voting power as one million shares of the common stock, (iv) entitle holders, upon any liquidation, dissolution or winding-up of Citigroup, to receive $1.00 per share of Series R Preferred Stock plus accrued and unpaid dividends or any amount equal to one million times the payment made on one share of common stock, whichever is greater, and (v) entitle holders to a per share payment equal to one million times the payment made one share of common stock, if shares of Citigroup’s common stock are exchanged in consolidation, merger, combination or other similar transactions.

The Rights are not exercisable until the earlier of (i) the close of business on the 10th business day after the date of the announcement that a person has become an Acquiring Person (as defined in the Plan) and (ii) the close of business on the 10th business day (or such later day as may be designated by Citigroup’s board of directors before any person has become an Acquiring Person) after the date of the commencement of a tender or exchange offer by any person which could, if consummated, result in such person becoming an Acquiring Person. The date that the Rights become exercisable is referred to as the “Distribution Date.” After any person has become an Acquiring Person, each Right (other than Rights treated as beneficially owned under certain U.S. tax rules by the Acquiring Person) generally entitles the holder to purchase for the Purchase Price a number of shares of Series R preferred stock having a market value of twice the Purchase Price.

At any time after any person has become an Acquiring Person (but before any person becomes the beneficial owner of 50% or more of the outstanding shares of Citigroup’s common stock), Citigroup’s board of directors may generally exchange all or part of the Rights (other than Rights beneficially owned under certain U.S. tax rules by an Acquiring Person) for shares of Series R preferred stock at an exchange ratio of one one-millionth of a share of Series R preferred stock per Right.

Citigroup’s board of directors may redeem all of the Rights at a price of $0.0001 per Right at any time before a Distribution Date.

Prior to the Distribution Date, the Rights are evidenced by the certificates (or current ownership statements issued with respect to uncertificated shares in lieu of certificates) for, and will be transferred with, Citigroup’s common stock, and the registered holders of Citigroup’s common stock will be deemed to be the registered holders of the Rights. After the Distribution Date, the rights agent will mail separate certificates evidencing the Rights to each record holder of Citigroup’s common stock as of the close of business on the Distribution Date, and thereafter the Rights will be transferable separately from Citigroup’s common stock. The Rights will expire on June 10, 2012, unless earlier exchanged or redeemed.

At any time prior to the Distribution Date, the Plan may be amended in any respect. At any time after the occurrence of a Distribution Date, the Plan may be amended in any respect that does not adversely affect Rights holders (other than any Acquiring Person).

A Rights holder has no rights as a stockholder of Citigroup, including the right to vote and to receive dividends.

The above summary of the Plan is qualified in its entirety by the full text of the Plan filed as Exhibit 4.1 to Citigroup’s Form 8-A filed June 11, 2009 and the Summary of Plan Adjustments filed as Exhibit 99.3 to Citigroup’s Form 8-K filed May 9, 2011, and both are incorporated herein by reference.

The following briefly summarizes the material terms of Citigroup’s preferred stock, other than pricing and related terms disclosed in the accompanying supplement. You should read the particular terms of any series of preferred stock offered by Citigroup, which will be described in more detail in any supplement relating to such series, together with the more detailed provisions of Citigroup’s restated certificate of incorporation and the certificate of designation relating to each particular series of preferred stock for provisions that may be important to you. The certificate of incorporation, as amended and restated, is incorporated by reference into the registration statement of which this prospectus forms a part. The certificate of designation relating to the particular series of preferred stock offered by the accompanying supplement and this prospectus will be filed as an exhibit to a document incorporated by reference in the registration statement. The prospectus supplement will also state whether any of the terms summarized below do not apply to the series of preferred stock being offered. For a description of Citigroup’s outstanding preferred stock, see “Description of Capital Stock.”

Under Citigroup’s certificate of incorporation, the board of directors of Citigroup is authorized to issue shares of preferred stock in one or more series, and to establish from time to time a series of preferred stock with the following terms specified:

Prior to the issuance of any series of preferred stock, the board of directors of Citigroup will adopt resolutions creating and designating the series as a series of preferred stock and the resolutions will be filed in a certificate of designation as an amendment to the certificate of incorporation. The term “board of directors of Citigroup” includes any duly authorized committee.

The rights of holders of the preferred stock offered may be adversely affected by the rights of holders of any shares of preferred stock that may be issued in the future. The board of directors may cause shares of preferred stock to be issued in public or private transactions for any proper corporate purpose. Examples of proper corporate purposes include issuances to obtain additional financing in connection with acquisitions or otherwise, and issuances to officers, directors and employees of Citigroup and its subsidiaries pursuant to benefit plans or otherwise. Shares of preferred stock issued by Citigroup may have the effect of rendering more difficult or discouraging an acquisition of Citigroup deemed undesirable by the board of directors of Citigroup.

Under existing interpretations of The Board of Governors of the Federal Reserve System, if the holders of the preferred stock become entitled to vote for the election of directors because dividends on the preferred stock are in arrears as described below, preferred stock may then be deemed a “class of voting securities” and a holder of 25% or more of the preferred stock or a holder of 5% or more of the preferred stock that is otherwise a bank holding company may then be regulated as a “bank holding company” with respect to Citigroup in accordance with the Bank Holding Company Act. In addition, at such time:

Before exercising its option to redeem any shares of preferred stock, Citigroup will obtain the approval of the Federal Reserve if then required by applicable law.

The preferred stock will be, when issued, fully paid and nonassessable. Holders of preferred stock will not have any preemptive or subscription rights to acquire more stock of Citigroup.

The transfer agent, registrar, dividend disbursing agent and redemption agent for shares of each series of preferred stock will be named in the supplement relating to such series.

Unless otherwise specified in connection with a particular offering of preferred stock, such shares will rank on an equal basis with each other series of preferred stock and prior to the common stock as to dividends and distributions of assets.

Holders of each series of preferred stock will be entitled to receive cash dividends when, as and if declared by the board of directors of Citigroup out of funds legally available for dividends. The rates and dates of payment of dividends will be set forth in the supplement relating to each series of preferred stock. Dividends will be payable to holders of record of preferred stock as they appear on the books of Citigroup or, if applicable, the records of the depositary referred to below under “Description of Depositary Shares,” on the record dates fixed by the board of directors. Dividends on a series of preferred stock may be cumulative or noncumulative.

Citigroup may not declare, pay or set apart for payment dividends on the preferred stock unless full dividends on other series of preferred stock that rank on an equal or senior basis have been paid or sufficient funds have been set apart for payment for

Partial dividends declared on shares of preferred stock and each other series of preferred stock ranking on an equal basis as to dividends will be declared pro rata. A pro rata declaration means that the ratio of dividends declared per share to accrued dividends per share will be the same for each series of preferred stock.

Similarly, Citigroup may not declare, pay or set apart for payment non-stock dividends or make other payments on the common stock or any other stock of Citigroup ranking junior to the preferred stock until full dividends on the preferred stock have been paid or set apart for payment for

The supplement for a series of preferred stock will state the terms, if any, on which shares of that series are convertible into or exchangeable for shares of Citigroup’s common stock.

If so specified in the applicable supplement, a series of preferred stock may be redeemable at any time, in whole or in part, at the option of Citigroup or the holder thereof and may be mandatorily redeemed.

Any partial redemptions of preferred stock will be made in a way that the board of directors decides is equitable.

Unless Citigroup defaults in the payment of the redemption price, dividends will cease to accrue after the redemption date on shares of preferred stock called for redemption and all rights of holders of such shares will terminate except for the right to receive the redemption price.

Upon any voluntary or involuntary liquidation, dissolution or winding up of Citigroup, holders of each series of preferred stock will be entitled to receive distributions upon liquidation in the amount set forth in the supplement relating to such series of preferred stock, plus an amount equal to any accrued and unpaid dividends. Such distributions will be made before any distribution is made on any securities ranking junior relating to liquidation, including common stock.

If the liquidation amounts payable relating to the preferred stock of any series and any other securities ranking on a parity regarding liquidation rights are not paid in full, the holders of the preferred stock of such series and such other securities will share in any such distribution of available assets of Citigroup on a ratable basis in proportion to the full liquidation preferences. Holders of such series of preferred stock will not be entitled to any other amounts from Citigroup after they have received their full liquidation preference.

The following briefly summarizes the material provisions of the deposit agreement and of the depositary shares and depositary receipts, other than pricing and related terms disclosed in the accompanying supplement. You should read the particular terms of any depositary shares and any depositary receipts that are offered by Citigroup and any deposit agreement relating to a particular series of preferred stock, which will be described in more detail in a supplement. The supplement will also state whether any of the generalized provisions summarized below do not apply to the depositary shares or depositary receipts being offered. A copy of the form of deposit agreement, including the form of depositary receipt, is incorporated by reference as an exhibit in the registration statement of which this prospectus forms a part. You should read the more detailed provisions of the deposit agreement and the form of depositary receipt for provisions that may be important to you.

Citigroup may, at its option, elect to offer fractional shares of preferred stock, rather than full shares of preferred stock. In such event, Citigroup will issue receipts for depositary shares, each of which will represent a fraction of a share of a particular series of preferred stock.

The shares of any series of preferred stock represented by depositary shares will be deposited under a deposit agreement between Citigroup and a bank or trust company selected by Citigroup having its principal office in the United States and having a combined capital and surplus of at least $50,000,000, as preferred stock depositary. Each owner of a depositary share will be entitled to all the rights and preferences of the underlying preferred stock, including dividend, voting, redemption, conversion and liquidation rights, in proportion to the applicable fraction of a share of preferred stock represented by such depositary share.

The depositary shares will be evidenced by depositary receipts issued pursuant to the deposit agreement. Depositary receipts will be distributed to those persons purchasing the fractional shares of preferred stock in accordance with the terms of the applicable supplement.

The preferred stock depositary will distribute all cash dividends or other cash distributions received in respect of the deposited preferred stock to the record holders of depositary shares relating to such preferred stock in proportion to the number of such depositary shares owned by such holders.

The preferred stock depositary will distribute any property received by it other than cash to the record holders of depositary shares entitled thereto. If the preferred stock depositary determines that it is not feasible to make such distribution, it may, with the approval of Citigroup, sell such property and distribute the net proceeds from such sale to such holders.

If a series of preferred stock represented by depositary shares is to be redeemed, the depositary shares will be redeemed from the proceeds received by the preferred stock depositary resulting from the redemption, in whole or in part, of such series of preferred stock. The depositary shares will be redeemed by the preferred stock depositary at a price per depositary share equal to the applicable fraction of the redemption price per share payable in respect of the shares of preferred stock so redeemed.

Whenever Citigroup redeems shares of preferred stock held by the preferred stock depositary, the preferred stock depositary will redeem as of the same date the number of depositary shares representing the shares of preferred stock so redeemed. If fewer than all the depositary shares are to be redeemed, the depositary shares to be redeemed will be selected by the preferred stock depositary by lot or ratably or by any other equitable method as the preferred stock depositary may decide.

Unless the related depositary shares have previously been called for redemption, any holder of depositary shares may receive the number of whole shares of the related series of preferred stock and any money or other property represented by such depositary receipts after surrendering the depositary receipts at the corporate trust office of the preferred stock depositary. Holders of depositary shares making such withdrawals will be entitled to receive whole shares of preferred stock on the basis set forth in the related supplement for such series of preferred stock.

However, holders of such whole shares of preferred stock will not be entitled to deposit such preferred stock under the deposit agreement or to receive depositary receipts for such preferred stock after such withdrawal. If the depositary shares surrendered by the holder in connection with such withdrawal exceed the number of depositary shares that represent the number of whole shares of preferred stock to be withdrawn, the preferred stock depositary will deliver to such holder at the same time a new depositary receipt evidencing such excess number of depositary shares.

Upon receipt of notice of any meeting at which the holders of any series of deposited preferred stock are entitled to vote, the preferred stock depositary will mail the information contained in such notice of meeting to the record holders of the depositary shares relating to such series of preferred stock. Each record holder of such depositary shares on the record date will be entitled to instruct the preferred stock depositary to vote the amount of the preferred stock represented by such holder’s depositary shares. The preferred stock depositary will try to vote the amount of such series of preferred stock represented by such depositary shares in accordance with such instructions.

Citigroup will agree to take all reasonable actions that the preferred stock depositary determines are necessary to enable the preferred stock depositary to vote as instructed. The preferred stock depositary will vote all shares of any series of preferred stock held by it proportionately with instructions received if it does not receive specific instructions from the holders of depositary shares representing such series of preferred stock.

The form of depositary receipt evidencing the depositary shares and any provision of the deposit agreement may at any time be amended by agreement between Citigroup and the preferred stock depositary. However, any amendment that imposes additional charges or materially and adversely alters any substantial existing right of the holders of depositary shares will not be effective unless such amendment has been approved by the holders of at least a majority of the affected depositary shares then outstanding. Every holder of an outstanding depositary receipt at the time any such amendment becomes effective, or any transferee of such holder, shall be deemed, by continuing to hold such depositary receipt, or by reason of the acquisition thereof, to consent and agree to such amendment and to be bound by the deposit agreement, which has been amended thereby. The deposit agreement automatically terminates if:

The deposit agreement may be terminated by Citigroup at any time and the preferred stock depositary will give notice of such termination to the record holders of all outstanding depositary receipts not less than 30 days prior to the termination date. In such event, the preferred stock depositary will deliver or make available for delivery to holders of depositary shares, upon surrender of such depositary shares, the number of whole or fractional shares of the related series of preferred stock as are represented by such depositary shares.

No fees, charges and expenses of the preferred stock depositary or any agent of the preferred stock depositary or of any registrar shall be payable by any person other than Citigroup, except for any taxes and other governmental charges and except as provided in the deposit agreement. If the preferred stock depositary incurs fees, charges or expenses for which it is not otherwise liable hereunder at the election of a holder of a depositary receipt or other person, such holder or other person will be liable for such fees, charges and expenses.

The preferred stock depositary may resign at any time by delivering to Citigroup notice of its intent to do so, and Citigroup may at any time remove the preferred stock depositary, any such resignation or removal to take effect upon the appointment of a successor preferred stock depositary and its acceptance of such appointment. Such successor preferred stock depositary must be appointed within 60 days after delivery of the notice of resignation or removal and must be a bank or trust company having its principal office in the United States and having a combined capital and surplus of at least $50,000,000.

The preferred stock depositary will forward all reports and communications from Citigroup that are delivered to the preferred stock depositary and that Citigroup is required to furnish to the holders of the deposited preferred stock.

Neither the preferred stock depositary nor Citigroup will be liable if it is prevented or delayed by law or any circumstances beyond its control in performing its obligations under the deposit agreement. The obligations of Citigroup and the preferred stock depositary under the deposit agreement will be limited to performance with honest intentions of their duties thereunder and they will not be obligated to prosecute or defend any legal proceeding in respect of any depositary shares, depositary receipts or shares of preferred stock unless satisfactory indemnity is furnished. Citigroup and the preferred stock depositary may rely upon written advice of counsel or accountants, or upon information provided by holders of depositary receipts or other persons believed to be competent and on documents believed to be genuine.

Citigroup may issue stock purchase contracts, including contracts obligating holders to purchase from or sell to Citigroup, and Citigroup to sell to or purchase from the holders, a specified number of shares of common stock, shares of preferred stock or depositary shares at a future date or dates. The consideration per share of common stock, preferred stock or depositary shares and the number of shares of each may be fixed at the time the stock purchase contracts are issued or may be determined by reference to a specific formula set forth in the stock purchase contracts. The stock purchase contracts may be issued separately or as part of units, often known as stock purchase units, consisting of a stock purchase contract and any combination of:

which may secure the holders’ obligations to purchase the common stock, preferred stock or depositary shares under the stock purchase contracts. The stock purchase contracts may require Citigroup to make periodic payments to the holders of the stock purchase units or vice versa, and these payments may be unsecured or prefunded on some basis. The stock purchase contracts may require holders to secure their obligations under those contracts in a specified manner.

The applicable supplement will describe the terms of the stock purchase contracts and stock purchase units, including, if applicable, collateral or depositary arrangements.

Citigroup may offer the offered securities in one or more of the following ways from time to time:

Any such underwriters, dealers or agents may include any broker-dealer subsidiary of Citigroup.

The supplement relating to an offering of offered securities will set forth the terms of such offering, including:

Any initial public offering prices, discounts or concessions allowed or reallowed or paid to dealers may be changed from time to time.

In compliance with the guidelines of the Financial Industry Regulatory Authority, Inc., the maximum discount or commission to be received by any FINRA member or independent broker-dealer may not exceed 8% of the aggregate amount of the securities offered pursuant to this prospectus and any applicable supplement; however, it is anticipated that the maximum commission or discount to be received in any particular offering of securities will be significantly less than this amount.

If underwriters are used in an offering of offered securities, such offered securities will be acquired by the underwriters for their own account and may be resold from time to time in one or more transactions, including negotiated transactions, at a fixed public offering price or at varying prices determined at the time of sale. The securities may be offered either to the public through underwriting syndicates represented by one or more managing underwriters or by one or more underwriters without a syndicate. Unless otherwise specified in connection with a particular offering of securities, the underwriters will not be obligated to purchase offered securities unless specified conditions are satisfied, and if the underwriters do purchase any offered securities, they will purchase all offered securities.

In connection with underwritten offerings of the offered securities and in accordance with applicable law and industry practice, underwriters may over-allot or effect transactions that stabilize, maintain or otherwise affect the market price of the offered securities at levels above those that might otherwise prevail in the open market, including by entering stabilizing bids, effecting syndicate covering transactions or imposing penalty bids, each of which is described below.

These transactions may be effected on the NYSE, in the over-the-counter market, or otherwise. Underwriters are not required to engage in any of these activities, or to continue such activities if commenced.

If dealers are utilized in the sale of offered securities, Citigroup will sell such offered securities to the dealers as principals. The dealers may then resell such offered securities to the public at varying prices to be determined by such dealers at the time of resale. The names of the dealers and the terms of the transaction will be set forth in the supplement relating to that transaction.

Offered securities may be sold directly by Citigroup to one or more institutional purchasers, or through agents designated by Citigroup from time to time, at a fixed price or prices, which may be changed, or at varying prices determined at the time of sale. Any agent involved in the offer or sale of the offered securities in respect of which this prospectus is delivered will be named, and any commissions payable by Citigroup to such agent will be set forth, in the supplement relating to that offering. Unless otherwise specified in connection with a particular offering of securities, any such agent will be acting on a best efforts basis for the period of its appointment.

As one of the means of direct issuance of offered securities, Citigroup may utilize the services of an entity through which it may conduct an electronic “dutch auction” or similar offering of the offered securities among potential purchasers who are eligible to participate in the auction or offering of such offered securities, if so described in the applicable supplement.

If so indicated in the applicable supplement, Citigroup will authorize agents, underwriters or dealers to solicit offers from certain types of institutions to purchase offered securities from Citigroup at the public offering price set forth in such supplement pursuant to delayed delivery contracts providing for payment and delivery on a specified date in the future. Such contracts will be subject only to those conditions set forth in the supplement and the supplement will set forth the commission payable for solicitation of such contracts.

Conflicts of Interest. The broker-dealer subsidiaries of Citigroup, including Citigroup Global Markets Inc., are members of the FINRA and may participate in distributions of the offered securities. Accordingly, offerings of offered securities in which Citigroup’s broker-dealer subsidiaries participate will conform with the requirements addressing conflicts of interest when distributing the securities of an affiliate set forth in FINRA Rule 5121.

This prospectus, together with any applicable supplement, may also be used by any broker-dealer subsidiary of Citigroup in connection with offers and sales of the offered securities in market-making transactions, including block positioning and block trades, at negotiated prices related to prevailing market prices at the time of sale. Any of Citigroup’s broker-dealer subsidiaries may act as principal or agent in such transactions. None of Citigroup’s broker-dealer subsidiaries have any obligation to make a market in any of the offered securities and may discontinue any market-making activities at any time without notice, at its sole discretion.

One or more dealers, referred to as “remarketing firms,” may also offer or sell the securities, if the supplement so indicates, in connection with a remarketing arrangement contemplated by the terms of the securities. Remarketing firms will act as principals for their own accounts or as agents. The supplement will identify any remarketing firm and the terms of its agreement, if any, with Citigroup and will describe the remarketing firm’s compensation. Remarketing firms may be deemed to be underwriters in connection with the remarketing of the securities.

Underwriters, dealers and agents may be entitled, under agreements with Citigroup, to indemnification by Citigroup relating to material misstatements and omissions. Underwriters, dealers and agents may be customers of, engage in transactions with, or perform services for, Citigroup and affiliates of Citigroup in the ordinary course of business.

Except for securities issued upon a reopening of a previous series, each series of offered securities will be a new issue of securities and will have no established trading market. Any underwriters to whom offered securities are sold for public offering and sale may make a market in such offered securities, but such underwriters will not be obligated to do so and may discontinue any market making at any time without notice. The offered securities may or may not be listed on a securities exchange. No assurance can be given that there will be a market for the offered securities.

A fiduciary of a pension, profit-sharing or other employee benefit plan governed by the Employee Retirement Income Security Act of 1974, as amended (“ERISA”), should consider the fiduciary standards of ERISA in the context of the ERISA plan’s particular circumstances before authorizing an investment in the offered securities of Citigroup. Among other factors, the fiduciary should consider whether such an investment is in accordance with the documents governing the ERISA plan and whether the investment is appropriate for the ERISA plan in view of its overall investment policy and diversification of its portfolio.

Certain provisions of ERISA and the Internal Revenue Code of 1986, as amended (the “Code”), prohibit employee benefit plans (as defined in Section 3(3) of ERISA) that are subject to Title I of ERISA, plans described in Section 4975(e)(1) of the Code (including, without limitation, retirement accounts and Keogh Plans), and entities whose underlying assets include plan assets by reason of a plan’s investment in such entities (including, without limitation, as applicable, insurance company general accounts) (collectively, “plans”), from engaging in certain transactions involving “plan assets” with parties that are “parties in interest” under ERISA or “disqualified persons” under the Code with respect to the plan or entity. Governmental and other plans that are not subject to ERISA or to the Code may be subject to similar restrictions under state, federal or local law. Any employee benefit plan or other entity, to which such provisions of ERISA, the Code or similar law apply, proposing to acquire the offered securities should consult with its legal counsel.

Citigroup has subsidiaries, including insurance company subsidiaries and broker-dealer subsidiaries, that provide services to many employee benefit plans. Citigroup and any such direct or indirect subsidiary of Citigroup may each be considered a “party in interest” and a “disqualified person” to a large number of plans. A purchase of offered securities of Citigroup by any such plan would be likely to result in a prohibited transaction between the plan and Citigroup.

Accordingly, unless otherwise provided in connection with a particular offering of securities, offered securities may not be purchased, held or disposed of by any plan or any other person investing “plan assets” of any plan that is subject to the prohibited transaction rules of ERISA or Section 4975 of the Code or other similar law, unless one of the following exemptions (or a similar exemption or exception) applies to such purchase, holding and disposition:

Unless otherwise provided in connection with a particular offering of securities, any purchaser of the offered securities or any interest therein will be deemed to have represented and warranted to Citigroup on each day including the date of its purchase of the offered securities through and including the date of disposition of such offered securities that either:

Due to the complexity of these rules and the penalties imposed upon persons involved in prohibited transactions, it is important that any person considering the purchase of the offered securities with plan assets consult with its counsel regarding the consequences under ERISA and the Code, or other similar law, of the acquisition and ownership of offered securities and the availability of exemptive relief under the class exemptions listed above.

Julie Bell Lindsay, General Counsel — Capital Markets and Corporate Reporting of Citigroup, Michael J. Tarpley, Associate General Counsel — Capital Markets and/or Skadden, Arps, Slate, Meagher & Flom LLP, New York, New York, or counsel to be identified in the applicable supplement, will act as legal counsel to Citigroup. Ms. Lindsay and Mr. Tarpley each respectively beneficially own, or have rights to acquire under Citigroup’s employee benefit plans, an aggregate of less than 1% of Citigroup’s common stock. Cleary Gottlieb Steen & Hamilton LLP, New York, New York, or other counsel identified in the applicable supplement, will act as legal counsel to the underwriters. Cleary Gottlieb Steen & Hamilton LLP has from time to time acted as counsel for Citigroup and its subsidiaries and may do so in the future.

The consolidated financial statements of Citigroup Inc. as of December 31, 2010 and 2009, and for each of the years in the three-year period ended December 31, 2010, and management’s assessment of effectiveness of internal control over financial reporting as of December 31, 2010, have been incorporated by reference herein in reliance upon the reports of KPMG LLP, independent registered public accounting firm, incorporated by reference herein, and upon the authority of said firm as experts in accounting and auditing. To the extent that KPMG audits and reports on consolidated financial statements of Citigroup at future dates and consents to the use of their reports thereon, such consolidated financial statements also will be incorporated by reference in the registration statement in reliance upon their reports and said authority. The report of KPMG LLP on the consolidated financial statements refers to changes in 2010 in Citigroup’s method of accounting for qualifying special purpose entities, variable interest entities and embedded credit derivatives and to changes in 2009 in Citigroup’s methods of accounting for other-than-temporary impairments on investment securities, business combinations, noncontrolling interests in subsidiaries, and earnings per share.


Risk Factors			S-1

Important Currency Information			S-3

Forward-Looking Statements			S-4

Description of the Notes			S-5

United States Federal Income Tax Considerations			S-22

Plan of Distribution; Conflicts Of Interest			S-31

Benefit Plan Investor Considerations			S-35

Legal Matters			S-37

Prospectus

Prospectus Summary			1

Forward-Looking Statements			7

Citigroup Inc.			7

Use of Proceeds and Hedging			7

European Monetary Union			9

Description of Debt Securities			9

United States Tax Documentation Requirements			33

United States Federal Income Tax Considerations			34

Currency Conversions and Foreign Exchange Risks Affecting Debt Securities Denominated in a Foreign Currency			41

Description of Common Stock Warrants			43

Description of Index Warrants			44

Description of Capital Stock			47

Description of Preferred Stock			49

Description of Depositary Shares			52

Description of Stock Purchase Contracts and Stock Purchase Units			54

Plan of Distribution			55

ERISA Considerations			57

Legal Matters			58

Experts			58


Bond Equivalent Yield	=	D × N	× 100
		360 – (D × M)


Interest Payment Frequency		Interest Payment Dates
Monthly		Fifteenth day of each calendar month, beginning in the first calendar month following the month the debt security was issued.

Quarterly		Fifteenth day of every third month, beginning in the third calendar month following the month the debt security was issued.

Semi-annually		Fifteenth day of every sixth month, beginning in the sixth calendar month following the month the debt security was issued.

Annually		Fifteenth day of every twelfth month, beginning in the twelfth calendar month following the month the debt security was issued.


Bond Equivalent Yield	=	D × N	×	100
		360 – (D × M)	×	100


Title of Series	Number of Shares Outstanding	Dividends Per Year	Redemption Price Per Share ($)	Date Next Redeemable by Citigroup	General Voting Rights
8.125% Non-Cumulative Preferred Stock, Series AA	3,870	8.125%	25,000	February 15, 2018	No
8.40% Fixed Rate/Floating Rate Non-Cumulative Preferred Stock, Series E	4,850	8.400%(1)	25,000	April 30, 2018	No
8.50% Non-Cumulative Preferred Stock, Series F	2,863	8.500%	25,000	June 15, 2013	No
6.5% Non-Cumulative Convertible Preferred Stock, Series T	454	6.500%	50,000	February 15, 2015	No