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0000893226FRANKLIN STRATEGIC MORTGAGE PORTFOLIO4972018-09-102018-09-102017-09-30false2018-09-10Fund SummaryInvestment GoalHigh total return (a combination of high current income and capital appreciation) relative to the performance of the general mortgage securities market.Fees and Expenses of the FundYou may qualify for sales charge discounts in Class A if you and your family invest, or agree to invest in the future, at least $100,000 in Franklin Templeton funds.100000<div><p>These tables describe the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales charge discounts in Class A if you and your family invest, or agree to invest in the future, at least $100,000 in Franklin Templeton funds. More information about these and other discounts is available from your financial professional and under “Your Account” on page 36 in the Fund's Prospectus and under “Buying and Selling Shares” on page 60 of the Fund’s Statement of Additional Information. In addition, more information about sales charge discounts and waivers for purchases of shares through specific intermediaries is set forth in "Appendix A - Intermediary Sales Charge Discounts and Waivers" to the Fund's prospectus.</p><p>Please note that the tables and examples below do not reflect any transaction fees that may be charged by financial intermediaries, or commissions that a shareholder may be required to pay directly to its financial intermediary when buying or selling Class R6 or Advisor Class shares.</p></div>Shareholder Fees (fees paid directly from your investment)~ http://www.proofPlus.com/role/ShareholderFeesS000006875_FranklinStrategicMortgagePortfolio16 column period compact * ~0.000.00<div><p>Annual Fund Operating Expenses</p><p>(expenses that you pay each year as a percentage of the value of your investment)</p></div>~ http://www.proofPlus.com/role/OperatingExpensesS000006875_FranklinStrategicMortgagePortfolio16 column period compact * ~0.00400.00400.00400.00400.00400.00250.000.00650.000.000.00010.00010.00010.00010.00010.01150.00900.01550.00790.00900.01010.00760.01410.00650.0076ExampleThis Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of the period. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. The Example reflects adjustments made to the Fund's operating expenses due to the fee waivers and/or expense reimbursements by management for the 1 Year numbers only. Although your actual costs may be higher or lower, based on these assumptions your costs would be:52476210181752~ http://www.proofPlus.com/role/ExpenseExampleS000006875_FranklinStrategicMortgagePortfolio16 column period compact * ~4996868891474244476832183466238425965782734851095If you do not sell your shares:~ http://www.proofPlus.com/role/ExpenseExampleNoRedemptionS000006875_FranklinStrategicMortgagePortfolio16 column period compact * ~1444768321834Portfolio Turnover2.4409<div><p>The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual Fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 244.09% of the average value of its portfolio.</p></div>Principal Investment Strategies<div><p>Under normal market conditions, the Fund invests at least 80% of its net assets in mortgage securities. The Fund invests substantially in mortgage securities that are issued or guaranteed by the U.S. government, its agencies or instrumentalities, which include mortgage pass-through securities representing interests in "pools" of mortgage loans issued or guaranteed by the Government National Mortgage Association (Ginnie Mae), Fannie Mae, and Freddie Mac. These securities may be fixed-rate or adjustable-rate mortgage securities (ARMS). Securities issued by different government agencies or instrumentalities have different levels of credit support.</p><p>The Fund may purchase or sell mortgage-backed securities on a delayed delivery or forward commitment basis through the "to-be-announced" (TBA) market. With TBA transactions, the particular securities to be delivered must meet specified terms and conditions.</p><p>The Fund also invests in other types of mortgage securities including, but not limited to, certain ARMS, commercial mortgage-backed securities (CMBS), non-agency residential mortgage-backed securities (RMBS), credit risk transfer securities, home equity loan asset-backed securities (HELs), manufactured housing asset-backed securities (MHs), and collateralized mortgage obligations (CMOs), as well as in other mortgage-related asset-backed securities. Mortgage securities may include interests in reperforming loans (mortgage loans that are current but had been delinquent in the past). The Fund also may invest in U.S. Treasury securities. The Fund may invest a small portion of its assets directly in whole mortgage loans.</p><p>The Fund may invest up to 15% of its net assets in foreign securities, which may include non-U.S. dollar denominated foreign mortgage securities. In addition, the Fund may invest up to 20% of its net assets in high-yield, lower-quality securities rated, at the time of purchase, below BBB by S&P®, or Baa by Moody’s, respectively, or, if unrated, deemed to be of comparable quality by the investment manager. The Fund may also invest up to 33% of its gross assets in mortgage dollar rolls.</p><p>For purposes of pursuing its investment goal, the Fund may enter into interest rate and credit related transactions involving certain derivative instruments, including interest rate and credit default swaps and bond/interest rate futures contracts. The Fund may also enter into currency-related derivative transactions, including currency forwards and currency swaps. The Fund may use these derivative instruments for hedging purposes or for other investment purposes, including to generate income, to increase liquidity and/or to gain exposure to certain instruments or markets in a more efficient or less expensive way. The use of credit default swaps may allow the Fund to obtain net long or short exposure to select credit risks.</p></div>Principal Risks<div><p>You could lose money by investing in the Fund. Mutual fund shares are not deposits or obligations of, or guaranteed or endorsed by, any bank, and are not insured by the Federal Deposit Insurance Corporation, the Federal Reserve Board, or any other agency of the U.S. government.</p><p>Interest Rate</p><p>When interest rates rise, debt security prices generally fall. The opposite is also generally true: debt security prices rise when interest rates fall. Interest rate changes are influenced by a number of factors, including government policy, monetary policy, inflation expectations, perceptions of risk, and supply and demand of bonds. In general, securities with longer maturities or durations are more sensitive to interest rate changes.</p><p>Mortgage Securities and Prepayment</p><p>Mortgage securities differ from conventional debt securities because principal is paid back periodically over the life of the security rather than at maturity. The Fund may receive unscheduled payments of principal due to voluntary prepayments, refinancings or foreclosures on the underlying mortgage loans. Because of prepayments, mortgage securities may be less effective than some other types of debt securities as a means of "locking in" long-term interest rates and may have less potential for capital appreciation during periods of falling interest rates. A reduction in the anticipated rate of principal prepayments, especially during periods of rising interest rates, may increase or extend the effective maturity of mortgage securities, making them more sensitive to interest rate changes, subject to greater price volatility, and more susceptible than some other debt securities to a decline in market value when interest rates rise.</p><p>Credit</p><p>An issuer of debt securities may fail to make interest payments and repay principal when due, in whole or in part. Changes in an issuer's financial strength or in a security's or government's credit rating may affect a security's value. Mortgage-backed securities that are not issued by U.S. government agencies may have a greater risk of default because neither the U.S. government nor an agency or instrumentality have guaranteed or provided credit support to them. The credit quality of most asset-backed securities depends primarily on the credit quality of the underlying assets and the amount of credit support (if any) provided to the securities. While securities issued by Ginnie Mae are backed by the full faith and credit of the U.S. government, not all securities of the various U.S. government agencies are, including those of Fannie Mae and Freddie Mac. Also, guarantees of principal and interest payments do not apply to market prices, yields or the Fund’s share price. While the U.S. government has, in the past, provided financial support to Fannie Mae and Freddie Mac, the U.S. government is not obligated by law to do so and no assurance can be given that the U.S. government will do so in the future.</p><p>High-Yield Mortgage Securities</p><p>Mortgage securities that are rated below investment grade, or unrated and deemed to be of comparable quality by the investment manager, involve greater credit risk with respect to the issuers of the mortgage securities and the borrowers in the underlying mortgages than higher-quality mortgage securities. High-yield mortgage securities are more vulnerable to changes in the relevant economy, such as a recession or a sustained period of rising interest rates. The prices of high-yield mortgage securities generally fluctuate more than those of higher credit quality and are generally more illiquid (harder to sell) and harder to value.</p><p>Income</p><p>Because the Fund can only distribute what it earns, the Fund's distributions to shareholders may decline when prevailing interest rates fall or when the Fund experiences defaults on debt securities it holds.</p><p>Foreign Securities</p><p>Investing in foreign securities typically involves more risks than investing in U.S. securities, including risks related to currency exchange rates and policies, country or government specific issues, less favorable trading practices or regulation and greater price volatility. Certain of these risks also may apply to securities of U.S. companies with significant foreign operations.</p><p>Market</p><p>The market values of securities or other investments owned by the Fund will go up or down, sometimes rapidly or unpredictably. The market value of a security or other investment may be reduced by market activity or other results of supply and demand unrelated to the issuer. This is a basic risk associated with all investments. When there are more sellers than buyers, prices tend to fall. Likewise, when there are more buyers than sellers, prices tend to rise.</p><p>Management</p><p>The Fund is subject to management risk because it is an actively managed investment portfolio. The Fund's investment manager applies investment techniques and risk analyses in making investment decisions for the Fund, but there can be no guarantee that these decisions will produce the desired results.</p><p>Mortgage Dollar Rolls</p><p>In a mortgage dollar roll, the Fund takes the risk that: the market price of the mortgage-backed securities will drop below their future repurchase price; the securities that it repurchases at a later date will have less favorable market characteristics; the other party to the agreement will not be able to perform; the roll adds leverage to the Fund's portfolio; and, it increases the Fund's sensitivity to interest rate changes. In addition, investment in mortgage dollar rolls may increase the portfolio turnover rate for the Fund.</p><p>Derivative Instruments</p><p>The performance of derivative instruments depends largely on the performance of an underlying currency, security, interest rate or index, and such instruments often have risks similar to the underlying instrument, in addition to other risks. Derivatives involve costs and can create economic leverage in the Fund’s portfolio, which may result in significant volatility and cause the Fund to participate in losses (as well as gains) in an amount that significantly exceeds the Fund’s initial investment. Certain derivatives have the potential for unlimited loss, regardless of the size of the initial investment. Other risks include illiquidity, mispricing or improper valuation of the derivative instrument, and imperfect correlation between the value of the derivative and the underlying instrument so that the Fund may not realize the intended benefits. The successful use of derivatives will usually depend on the investment manager’s ability to accurately forecast movements in the market relating to the underlying instrument. Should a market or markets, or prices of particular classes of investments move in an unexpected manner, especially in unusual or extreme market conditions, the Fund may not achieve the anticipated benefits of the transaction, and it may realize losses, which could be significant. If the investment manager is not successful in using such derivative instruments, the Fund’s performance may be worse than if the investment manager did not use such derivative instruments at all. When a derivative is used for hedging, the change in value of the derivative may also not correlate specifically with the currency, security, interest rate, index or other risk being hedged. Derivatives also may present the risk that the other party to the transaction will fail to perform. There is also the risk, especially under extreme market conditions, that an instrument, which usually would operate as a hedge, provides no hedging benefits at all.</p><p>When-Issued and Delayed Delivery Transactions</p><p>Mortgage-backed securities may be issued on a when-issued or delayed delivery basis, where payment and delivery take place at a future date. Because the market price of the security may fluctuate during the time before payment and delivery, the Fund assumes the risk that the value of the security at delivery may be more or less than the purchase price.</p><p>Portfolio turnover</p><p>The investment manager will sell a security when it believes it is appropriate to do so, regardless of how long the Fund has held the security. The Fund's turnover rate may exceed 100% per year because of the anticipated use of certain investment strategies. The rate of portfolio turnover will not be a limiting factor for the investment manager in making decisions on when to buy or sell securities, including entering into mortgage dollar rolls. High turnover will increase the Fund's transaction costs and may increase your tax liability if the transactions result in capital gains.</p><p>For the most recent fiscal year, the Fund's portfolio turnover rate was 244.09% and the portfolio turnover rate excluding mortgage dollar rolls was 111.62%.</p></div>Performancefranklintempleton.com(800) DIAL BEN/342-5236The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.The following bar chart and table provide some indication of the risks of investing in the Fund. The bar chart shows changes in the Fund's performance from year to year for Class A shares. The table shows how the Fund's average annual returns for 1 year, 5 years, 10 years or since inception, as applicable, compared with those of a broad measure of market performance.Sales charges are not reflected in the bar chart, and if those charges were included, returns would be less than those shown.<div><p>The following bar chart and table provide some indication of the risks of investing in the Fund. The bar chart shows changes in the Fund's performance from year to year for Class A shares. The table shows how the Fund's average annual returns for 1 year, 5 years, 10 years or since inception, as applicable, compared with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You can obtain updated performance information at franklintempleton.com or by calling (800) DIAL BEN/342-5236.</p><p>The secondary index in the table below shows how the Fund's performance compares to a group of securities that aligns with a portion of the Fund's portfolio.</p><p>Sales charges are not reflected in the bar chart, and if those charges were included, returns would be less than those shown.</p></div>-0.06740.10340.10970.06610.05810.00410.06440.00840.01530.0266~ http://www.proofPlus.com/role/AnnualTotalReturnsBarChartS000006875_FranklinStrategicMortgagePortfolio16 column period compact * ~Best Quarter:2009-09-300.0447Worst Quarter:2008-12-31-0.0364<table style="font: 11px sans-serif; background-color:#DDDDDD" border="0" cellspacing="0" cellpadding="5" width="745"><tr><td style="border-bottom: 2px solid #ffffff;" valign="top">Best Quarter:</td><td style="border-bottom: 2px solid #ffffff;" valign="bottom" align="right">Q3'09</td><td style="border-bottom: 2px solid #ffffff;" valign="bottom" align="right">4.47%</td></tr><tr><td style="border-bottom: 2px solid #ffffff;" valign="top">Worst Quarter:</td><td style="border-bottom: 2px solid #ffffff;" valign="bottom" align="right">Q4'08</td><td style="border-bottom: 2px solid #ffffff;" valign="bottom" align="right">-3.64%</td></tr></table><div><p>Average Annual Total Returns<br/>(figures reflect sales charges)</p><p>For the periods ended December 31, 2017</p></div>~ http://www.proofPlus.com/role/AverageAnnualTotalReturnsS000006875_FranklinStrategicMortgagePortfolio16 column period compact * ~Return Before TaxesFranklin Strategic Mortgage Portfolio-0.01650.01460.0332Return After Taxes on DistributionsFranklin Strategic Mortgage Portfolio-0.02930.00150.0176Return After Taxes on Distributions and Sale of Fund SharesFranklin Strategic Mortgage Portfolio-0.00940.00500.0190-0.01410.01720.03590.01260.01950.03340.02920.02590.04030.02480.02040.03870.02470.02020.0385<div><p>No one index is representative of the Fund's portfolio.</p><p>Performance information for Class R6 shares is not shown because this class did not have a full calendar year of operations as of the date of this prospectus.</p><p>Historical performance for Class A, Class C and Advisor Class shares prior to their inception is based on the performance of Class A1 shares. This performance has been adjusted to reflect differences in sales charges and/or Rule 12b-1 fees, as applicable.</p><p>The after-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown only for Class A and after-tax returns for other classes will vary.</p></div>There is a 0.75% contingent deferred sales charge that applies to investments of $500,000 or more (see "Investments of $500,000 or More" under "Choosing a Share Class") and purchases by certain retirement plans without an initial sales charge on shares sold within 18 months of purchase.Other expenses have been restated to exclude non-recurring prior period expenses to reflect current fiscal year expenses. If these expenses were included in the table above, the amounts stated would be greater. Consequently, the total annual Fund operating expenses differ from the ratio of expenses to average net assets shown in the Financial Highlights.The Fund began offering Class R6 shares on August 1, 2017. Other expenses for Class R6 are based on estimated amounts for the current fiscal year.Effective October 5, 2018, Class C shares that have been held for 10 years or more will convert automatically into Class A shares later in the month of October 2018 and will be subject to Class A shares’ lower Rule 12b-1 fees. Thereafter, Class C shares of the Fund will convert automatically to Class A shares of the Fund on a monthly basis in the month of, or the month following, the 10-year anniversary of the Class C shares’ purchase date. Such conversions will be on the basis of the relative net asset values of the two classes, will not be subject to Class A shares’ sales charges and are not expected to be a taxable event for federal income tax purposes. Certain shares that are invested through retirement plans, omnibus accounts or in certain other instances may not automatically convert if the financial intermediary does not have the ability to track purchases to credit individual shareholders’ holding periods. (See “Your Account – Choosing a Shares Class – Sales Charges - Class C – Automatic Conversion of Class C Shares to Class A Shares After 10-Year Holding Period” for more information.)The Fund began offering Class R6 shares on August 1, 2017.The fee waiver and/or expense reimbursement above has been updated to reflect that the investment manager and administrator have contractually agreed to waive or assume certain expenses so that common expenses (excluding Rule 12b-1 fees and acquired fund fees and expenses and certain non-routine expenses) for each class of the Fund do not exceed 0.75% for the next 12-month period. The investment manager also has contractually agreed in advance to reduce its fees as a result of the Fund's investment in a Franklin Templeton money fund (acquired fund) for the next 12-month period. Contractual fee waiver and/or expense reimbursement agreements may not be changed or terminated during the time period set forth above.The performance of Class A shares shown in the bar chart prior to their inception in 2011, is based upon the performance of Class A1 shares (formerly, Class A shares), which are no longer available to new investors.