485BPOS

As filed with the U.S. Securities and Exchange Commission on April 16, 2013

Securities Act File No. 2-96408

Investment Company Act File No. 811-04254

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM N-1A

REGISTRATION STATEMENT

UNDER

THE SECURITIES ACT OF 1933	x
Pre-Effective Amendment No.	¨
Post-Effective Amendment No. 216	x
and/or
REGISTRATION STATEMENT
UNDER
THE INVESTMENT COMPANY ACT OF 1940	x

Amendment No. 217

(Check appropriate box or boxes)

Legg Mason Partners Income Trust

(Exact Name of Registrant as Specified in Charter)

620 Eighth Avenue, New York, New York	10018
(Address of Principal Executive Offices)	(Zip Code)

Registrant’s Telephone Number, including Area Code (877) 721-1926

Robert I. Frenkel

Legg Mason Partners Income Trust

100 First Stamford Place

Stamford, Connecticut 06902

(Name and Address of Agent for Service)

COPY TO:

Roger P. Joseph, Esq.

Bingham McCutchen LLP

One Federal Street

Boston, Massachusetts 02110

Continuous

(Approximate Date of Proposed Offering)

It is proposed that this filing will become effective:

x immediately upon filing pursuant to paragraph (b)

¨ on                     pursuant to paragraph (b)

¨ 60 days after filing pursuant to paragraph (a)(1)

¨ on                     pursuant to paragraph (a)(1)

¨ 75 days after filing pursuant to paragraph (a)(2)

¨ on                     pursuant to paragraph (a)(2) of Rule 485.

If appropriate, check the following box:

¨ This post-effective amendment designates a new effective date for a previously filed post-effective amendment.

This filing relates solely to Western Asset Intermediate Maturity California Municipals Fund, Western Asset Intermediate Maturity New York Municipals Fund and Western Asset Massachusetts Municipals Fund.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, as amended (the “Securities Act”), and the Investment Company Act of 1940, as amended, the Registrant, LEGG MASON PARTNERS INCOME TRUST, certifies that it meets all requirements for effectiveness of this Post-Effective Amendment to the Registration Statement pursuant to Rule 485(b) under the Securities Act and has duly caused this Post-Effective Amendment to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of New York, State of New York on this 16th day of April, 2013.

LEGG MASON PARTNERS INCOME TRUST, on behalf of its series:

Western Asset Intermediate Maturity California Municipals Fund

Western Asset Intermediate Maturity New York Municipals Fund

Western Asset Massachusetts Municipals Fund

By:	/s/ R. Jay Gerken
	R. Jay Gerken
	President and Principal Executive Officer

WITNESS our hands on the date set forth below.

Pursuant to the requirements of the Securities Act, this Post-Effective Amendment to the Registration Statement has been signed below by the following persons in the capacities indicated below on April 16, 2013.

Signature	Title
/s/ R. Jay Gerken	President, Principal Executive Officer and Trustee
R. Jay Gerken
/s/ Richard F. Sennett	Principal Financial Officer
Richard F. Sennett
/s/ Elliott J. Berv*	Trustee
Elliott J. Berv
/s/ A. Benton Cocanougher*	Trustee
A. Benton Cocanougher
/s/ Jane F. Dasher*	Trustee
Jane F. Dasher
/s/ Mark T. Finn*	Trustee
Mark T. Finn
/s/ Stephen R. Gross*	Trustee
Stephen R. Gross
/s/ Richard E. Hanson, Jr.*	Trustee
Richard E. Hanson, Jr.

- 3 -

/s/ Diana R. Harrington*	Trustee
Diana R. Harrington
/s/ Susan M. Heilbron*	Trustee
Susan M. Heilbron
/s/ Susan B. Kerley*	Trustee
Susan B, Kerley
/s/ Alan G. Merten*	Trustee
Alan G. Merten
/s/ R. Richardson Pettit*	Trustee
R. Richardson Pettit

*By:	/s/ R. Jay Gerken
	R. Jay Gerken

* Attorney-in-Fact, pursuant to Power of Attorney.

- 4 -

EXHIBIT INDEX

Index No.	Description of Exhibit
EX-101.INS	XBRL Instance Document
EX-101.SCH	XBRL Taxonomy Extension Schema Document
EX-101.CAL	XBRL Taxonomy Extension Calculation Linkbase
EX-101.DEF	XBRL Taxonomy Extension Definition Linkbase
EX-101.LAB	XBRL Taxonomy Extension Labels Linkbase
EX-101.PRE	XBRL Taxonomy Extension Presentation Linkbase

- 5 -

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	LEGG MASON PARTNERS INCOME TRUST
Prospectus Date	rr_ProspectusDate	Mar. 31, 2013
Western Asset Massachusetts Municipals Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	Western Asset Massachusetts Municipals Fund
Objective [Heading]	rr_ObjectiveHeading	Investment objective
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The fund seeks to provide Massachusetts investors with as high a level of current income exempt from federal income tax and Massachusetts personal income taxes as is consistent with the preservation of principal.
Expense [Heading]	rr_ExpenseHeading	Fees and expenses of the fund
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	The accompanying table describes the fees and expenses that you may pay if you buy and hold shares of the fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in funds sold by Legg Mason Investor Services, LLC (“LMIS”), the fund’s distributor. More information about these and other discounts is available from your financial intermediary, in this Prospectus on page 21 under the heading “Sales charges” and in the fund’s statement of additional information (“SAI”) on page 60 under the heading “Sales Charge Waivers and Reductions.”
Shareholder Fees Caption [Text]	rr_ShareholderFeesCaption	Shareholder fees (fees paid directly from your investment)
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment) (%)
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	December 31, 2014
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	Portfolio turnover.
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	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 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 14% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	14.00%
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in funds sold by Legg Mason Investor Services, LLC (“LMIS”), the fund’s distributor.
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	100,000
Other Expenses, New Fund, Based on Estimates [Text]	rr_OtherExpensesNewFundBasedOnEstimates	"Other expenses" for Class FI shares are estimated for the current fiscal year. Actual expenses may differ from estimates.
Expense Example [Heading]	rr_ExpenseExampleHeading	Example
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	This 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: You invest $10,000 in the fund for the time periods indicated Your investment has a 5% return each year and the fund’s operating expenses remain the same You reinvest all distributions and dividends without a sales charge Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example by, Year, Caption [Text]	rr_ExpenseExampleByYearCaption	Number of years you own your shares ($)
Expense Example, No Redemption, By Year, Caption [Text]	rr_ExpenseExampleNoRedemptionByYearCaption	Number of years you own your shares ($)
Strategy [Heading]	rr_StrategyHeading	Principal investment strategies
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	Under normal circumstances, the fund invests at least 80% of its assets in investment grade "Massachusetts municipal securities" or other investments with similar economic characteristics. Massachusetts municipal securities are securities the interest on which is excluded from regular federal income tax and Massachusetts personal income taxes. The fund's 80% policy may not be changed without a shareholder vote. Interest on Massachusetts municipal securities may be subject to the federal alternative minimum tax. Massachusetts municipal securities include debt obligations issued by the Commonwealth of Massachusetts and its political subdivisions, agencies and public authorities, certain other governmental issuers (such as Puerto Rico, the U.S. Virgin Islands and Guam) and other qualifying issuers. These securities include participation or other interests in municipal securities issued or backed by banks, insurance companies and other financial institutions. Some municipal securities, such as general obligation issues, are backed by the issuer's taxing authority, while other municipal securities, such as revenue issues, are backed only by revenues from certain facilities or other sources and not by the issuer itself. The fund focuses on investment grade bonds (that is, securities rated in the Baa/BBB categories or above or, if unrated, determined to be of comparable credit quality by the subadviser) but may invest up to 20% of its assets in below investment grade bonds (commonly known as "junk bonds"). The fund may invest in securities of any maturity. The fund focuses primarily on intermediate-term and long-term municipal securities, and will normally invest in securities which have remaining maturities at the time of purchase from one to more than thirty years. Instead of, and/or in addition to, investing directly in particular securities, the fund may use instruments such as derivatives, including futures contracts, and synthetic instruments that are intended to provide economic exposure to the securities or the issuer. The fund may use one or more types of these instruments without limit, except that these instruments are taken into account when determining compliance with the fund's 80% policy. For additional information regarding derivatives, see "More on the fund's investment strategies, investments and risks—Derivatives" in this Prospectus. The fund may also engage in a variety of transactions using derivatives in order to change the investment characteristics of its portfolio (such as shortening or lengthening duration) and for other purposes. The fund is classified as "non-diversified," which means it may invest a larger percentage of its assets in a smaller number of issuers than a diversified fund.
Risk [Heading]	rr_RiskHeading	Certain risks
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	Risk is inherent in all investing. There is no assurance that the fund will meet its investment objective. The value of your investment in the fund, as well as the amount of return you receive on your investment, may fluctuate significantly. You may lose part or all of your investment in the fund or your investment may not perform as well as other similar investments. The following is a summary description of certain risks of investing in the fund. Market and interest rate risk. The market prices of the fund's securities may go up or down, sometimes rapidly or unpredictably, due to general market conditions, such as real or perceived adverse economic or political conditions, inflation, changes in interest rates, lack of liquidity in the bond markets or adverse investor sentiment. When market prices fall, the value of your investment will go down. The value of your investment may also go down when interest rates rise. A rise in rates tends to have a greater impact on the prices of longer term or duration securities. The financial crisis that began in 2008 has caused a significant decline in the value and liquidity of many securities of issuers worldwide. In response to the crisis, the U.S. and other governments and the Federal Reserve and certain foreign central banks have taken steps to support financial markets. The withdrawal of this support, failure of efforts in response to the crisis, or investor perception that these efforts are not succeeding could negatively affect financial markets generally as well as the value and liquidity of certain securities. In addition, policy and legislative changes in the United States and in other countries are changing many aspects of financial regulation. The impact of these changes on the markets, and the practical implications for market participants, may not be fully known for some time. Credit risk. If an issuer or guarantor of a security held by the fund or a counterparty to a financial contract with the fund defaults or is downgraded, or is perceived to be less creditworthy, or if the value of the assets underlying a security declines, the value of your investment will typically decline. Junk bonds have a higher risk of default and are considered speculative. Subordinated securities are more likely to suffer a credit loss than non-subordinated securities of the same issuer and will be disproportionately affected by a default, downgrade or perceived decline in creditworthiness. Derivatives risk. Using derivatives can increase fund losses and reduce opportunities for gains when market prices, interest rates or the derivative instruments themselves behave in a way not anticipated by the fund. Using derivatives also can have a leveraging effect and increase fund volatility. Derivatives may be difficult to sell, unwind or value, and the counterparty may default on its obligations to the fund. Recent legislation calls for new regulation of the derivatives markets. The extent and impact of the regulation are not yet fully known and may not be for some time. New regulation of derivatives may make them more costly, may limit their availability, or may otherwise adversely affect their value or performance. Leveraging risk. The value of your investment may be more volatile if the fund borrows or uses derivatives or other investments that have a leveraging effect on the fund's portfolio. Other risks also will be compounded. This is because leverage generally magnifies the effect of a change in the value of an asset and creates a risk of loss of value on a larger pool of assets than the fund would otherwise have had, potentially resulting in the loss of all assets. The fund may also have to sell assets at inopportune times to satisfy its obligations. Liquidity risk. Some assets held by the fund may be difficult to sell, or illiquid, particularly during times of market turmoil. Illiquid assets may also be difficult to value. If the fund is forced to sell an illiquid asset to meet redemption requests or other cash needs, the fund may be forced to sell at a loss. Risk of increase in expenses. Your actual costs of investing in the fund may be higher than the expenses shown in "Annual fund operating expenses" for a variety of reasons. For example, expense ratios may be higher than those shown if a fee limitation is changed or terminated or if average net assets decrease. Net assets are more likely to decrease and fund expense ratios are more likely to increase when markets are volatile. Tax risk. The income on the fund's municipal securities could become subject to regular federal income tax or Massachusetts personal income taxes due to noncompliant conduct by issuers, unfavorable legislation or litigation or adverse interpretations by regulatory authorities. Prepayment or call risk. Many issuers have a right to prepay their securities. If interest rates fall, an issuer may exercise this right. If this happens, the fund will be forced to reinvest prepayment proceeds at a time when yields on securities available in the market are lower than the yield on the prepaid security. The fund also may lose any premium it paid on the security. Extension risk. If interest rates rise, repayments of fixed income securities may occur more slowly than anticipated by the market. This may drive the prices of these securities down because their interest rates are lower than the current interest rate and they remain outstanding longer. Non-diversification risk. The fund is classified as "non-diversified," which means it may invest a larger percentage of its assets in a smaller number of issuers than a diversified fund. To the extent the fund invests its assets in a smaller number of issuers, the fund will be more susceptible to negative events affecting those issuers than a diversified fund. Risks relating to investments in municipal securities. Municipal issuers may be adversely affected by rising health care costs, increasing unfunded pension liabilities, and by the phasing out of federal programs providing financial support. Unfavorable conditions and developments relating to projects financed with municipal securities can result in lower revenues to issuers of municipal securities. Issuers often depend on revenues from these projects to make principal and interest payments. The value of municipal securities can also be adversely affected by changes in the financial condition of one or more individual municipal issuers or insurers of municipal issuers, regulatory and political developments, tax law changes or other legislative actions, and by uncertainties and public perceptions concerning these and other factors. Risks associated with focusing on investments in Massachusetts municipal securities. The fund focuses its investments on Massachusetts municipal securities. The fund may be affected significantly by adverse economic, political or other events affecting Massachusetts municipal issuers. Also, the fund may be more volatile than a more geographically diverse fund. Valuation risk. The sales price the fund could receive for any particular portfolio investment may differ from the fund's valuation of the investment, particularly for securities that trade in thin or volatile markets or that are valued using a fair value methodology. Investors who purchase or redeem fund shares on days when the fund is holding fair-valued securities may receive fewer or more shares or lower or higher redemption proceeds than they would have received if the fund had not fair-valued the security or had used a different valuation methodology. Cash management and defensive investing risk. The value of the investments held by the fund for cash management or defensive investing purposes can fluctuate. Like other fixed income securities, they are subject to risk, including market, interest rate and credit risk. If the fund holds cash uninvested it will be subject to the credit risk of the depository institution holding the cash. If the fund holds cash uninvested, the fund will not earn income on the cash and the fund's yield will go down. If a significant amount of the fund's assets are used for cash management or defensive investing purposes, it may not achieve its investment objective. Portfolio selection risk. The value of your investment may decrease if the subadviser's judgment about the quality, relative yield, value or market trends affecting a particular security, industry, sector or region, or about interest rates, is incorrect. These risks are discussed in more detail later in this Prospectus or in the SAI.
Risk Lose Money [Text]	rr_RiskLoseMoney	You may lose part or all of your investment in the fund or your investment may not perform as well as other similar investments.
Risk Nondiversified Status [Text]	rr_RiskNondiversifiedStatus	Non-diversification risk. The fund is classified as "non-diversified," which means it may invest a larger percentage of its assets in a smaller number of issuers than a diversified fund. To the extent the fund invests its assets in a smaller number of issuers, the fund will be more susceptible to negative events affecting those issuers than a diversified fund.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	Performance
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The accompanying 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 the average annual total returns of each class of the fund that has been in operation for at least one full calendar year and also compares the fund’s performance with the average annual total returns of an index or other benchmark and an average. Performance for classes other than those shown may vary from the performance shown to the extent the expenses for those classes differ. The fund makes updated performance information available at the fund’s website, http://www.leggmason.com/individualinvestors/products/mutual-funds/annualized_performance (select share class), or by calling the fund at 1-877-721-1926. The fund’s past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. Sales charges are not reflected in the accompanying bar chart, and if those charges were included, returns would be less than those shown.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	The bar chart shows changes in the fund’s performance from year to year for Class A shares. The table shows the average annual total returns of each class of the fund that has been in operation for at least one full calendar year and also compares the fund’s performance with the average annual total returns of an index or other benchmark and an average. Performance for classes other than those shown may vary from the performance shown to the extent the expenses for those classes differ.
Performance Availability Phone [Text]	rr_PerformanceAvailabilityPhone	1-877-721-1926
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	http://www.leggmason.com/individualinvestors/products/mutual-funds/annualized_performance (select share class)
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	The fund’s past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future.
Bar Chart [Heading]	rr_BarChartHeading	Total returns (before taxes) (%)
Bar Chart Does Not Reflect Sales Loads [Text]	rr_BarChartDoesNotReflectSalesLoads	Sales charges are not reflected in the accompanying bar chart, and if those charges were included, returns would be less than those shown.
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Calendar Years ended December 31 Best quarter (09/30/2009): 7.16 Worst quarter (12/31/2008): (6.07)
Performance Table Heading	rr_PerformanceTableHeading	Average annual total returns (for periods ended December 31, 2012) (%)
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	The after-tax returns are shown only for Class A shares are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table One Class of after Tax Shown [Text]	rr_PerformanceTableOneClassOfAfterTaxShown	After-tax returns for classes other than Class A will vary from returns shown for Class A.
Performance Table Narrative	rr_PerformanceTableNarrativeTextBlock	The after-tax returns are shown only for Class A shares 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 for classes other than Class A will vary from returns shown for Class A.
Western Asset Massachusetts Municipals Fund | Class A
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a % of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	4.25%
Maximum deferred sales charge (load) (as a % of the lower of net asset value at purchase or redemption) (may be reduced over time)	rr_MaximumDeferredSalesChargeOverOther	none	[1]
Small account fee ($)	rr_MaximumAccountFee	15	[2]
Management fees	rr_ManagementFeesOverAssets	0.50%
Distribution and service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.15%
Other expenses	rr_OtherExpensesOverAssets	0.15%
Total annual fund operating expenses	rr_ExpensesOverAssets	0.80%
Fees waived and/or expenses reimbursed	rr_FeeWaiverOrReimbursementOverAssets	(0.05%)	[3]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses	rr_NetExpensesOverAssets	0.75%
1 year	rr_ExpenseExampleYear01	498
3 years	rr_ExpenseExampleYear03	665
5 years	rr_ExpenseExampleYear05	846
10 years	rr_ExpenseExampleYear10	1,368
1 year	rr_ExpenseExampleNoRedemptionYear01	498
3 years	rr_ExpenseExampleNoRedemptionYear03	665
5 years	rr_ExpenseExampleNoRedemptionYear05	846
10 years	rr_ExpenseExampleNoRedemptionYear10	1,368
2003	rr_AnnualReturn2003	5.04%
2004	rr_AnnualReturn2004	3.25%
2005	rr_AnnualReturn2005	2.09%
2006	rr_AnnualReturn2006	6.00%
2007	rr_AnnualReturn2007	3.31%
2008	rr_AnnualReturn2008	(9.09%)
2009	rr_AnnualReturn2009	19.10%
2010	rr_AnnualReturn2010	0.21%
2011	rr_AnnualReturn2011	11.38%
2012	rr_AnnualReturn2012	7.60%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best quarter
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Sep. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	7.16%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst Quarter
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(6.07%)
1 year	rr_AverageAnnualReturnYear01	3.06%
5 years	rr_AverageAnnualReturnYear05	4.48%
10 years	rr_AverageAnnualReturnYear10	4.21%
Western Asset Massachusetts Municipals Fund | Class C
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a % of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) (as a % of the lower of net asset value at purchase or redemption) (may be reduced over time)	rr_MaximumDeferredSalesChargeOverOther	1.00%
Small account fee ($)	rr_MaximumAccountFee	15	[2]
Management fees	rr_ManagementFeesOverAssets	0.50%
Distribution and service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.70%
Other expenses	rr_OtherExpensesOverAssets	0.18%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.38%
Fees waived and/or expenses reimbursed	rr_FeeWaiverOrReimbursementOverAssets	(0.08%)	[3]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses	rr_NetExpensesOverAssets	1.30%
1 year	rr_ExpenseExampleYear01	232
3 years	rr_ExpenseExampleYear03	429
5 years	rr_ExpenseExampleYear05	747
10 years	rr_ExpenseExampleYear10	1,650
1 year	rr_ExpenseExampleNoRedemptionYear01	132
3 years	rr_ExpenseExampleNoRedemptionYear03	429
5 years	rr_ExpenseExampleNoRedemptionYear05	747
10 years	rr_ExpenseExampleNoRedemptionYear10	1,650
1 year	rr_AverageAnnualReturnYear01	6.02%
5 years	rr_AverageAnnualReturnYear05	4.80%
10 years	rr_AverageAnnualReturnYear10	4.05%
Western Asset Massachusetts Municipals Fund | Class FI
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a % of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) (as a % of the lower of net asset value at purchase or redemption) (may be reduced over time)	rr_MaximumDeferredSalesChargeOverOther	none
Small account fee ($)	rr_MaximumAccountFee	none	[2]
Management fees	rr_ManagementFeesOverAssets	0.50%
Distribution and service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	0.43%	[4]
Total annual fund operating expenses	rr_ExpensesOverAssets	1.18%
Fees waived and/or expenses reimbursed	rr_FeeWaiverOrReimbursementOverAssets	(0.33%)	[3]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses	rr_NetExpensesOverAssets	0.85%
1 year	rr_ExpenseExampleYear01	87
3 years	rr_ExpenseExampleYear03	342
5 years	rr_ExpenseExampleYear05	617
10 years	rr_ExpenseExampleYear10	1,403
1 year	rr_ExpenseExampleNoRedemptionYear01	87
3 years	rr_ExpenseExampleNoRedemptionYear03	342
5 years	rr_ExpenseExampleNoRedemptionYear05	617
10 years	rr_ExpenseExampleNoRedemptionYear10	1,403
Western Asset Massachusetts Municipals Fund | Class I
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a % of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) (as a % of the lower of net asset value at purchase or redemption) (may be reduced over time)	rr_MaximumDeferredSalesChargeOverOther	none
Small account fee ($)	rr_MaximumAccountFee	none	[2]
Management fees	rr_ManagementFeesOverAssets	0.50%
Distribution and service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.23%
Total annual fund operating expenses	rr_ExpensesOverAssets	0.73%
Fees waived and/or expenses reimbursed	rr_FeeWaiverOrReimbursementOverAssets	(0.13%)	[3]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses	rr_NetExpensesOverAssets	0.60%
1 year	rr_ExpenseExampleYear01	61
3 years	rr_ExpenseExampleYear03	220
5 years	rr_ExpenseExampleYear05	393
10 years	rr_ExpenseExampleYear10	894
1 year	rr_ExpenseExampleNoRedemptionYear01	61
3 years	rr_ExpenseExampleNoRedemptionYear03	220
5 years	rr_ExpenseExampleNoRedemptionYear05	393
10 years	rr_ExpenseExampleNoRedemptionYear10	894
1 year	rr_AverageAnnualReturnYear01	7.84%
5 years	rr_AverageAnnualReturnYear05		[5]
10 years	rr_AverageAnnualReturnYear10		[5]
Since inception	rr_AverageAnnualReturnSinceInception	5.54%
Inception date	rr_AverageAnnualReturnInceptionDate	Jun. 03, 2008
Western Asset Massachusetts Municipals Fund | Return after taxes on distributions | Class A
Risk/Return:	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	3.06%
5 years	rr_AverageAnnualReturnYear05	4.48%
10 years	rr_AverageAnnualReturnYear10	4.21%
Western Asset Massachusetts Municipals Fund | Return after taxes on distributions and sale of fund shares | Class A
Risk/Return:	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	3.29%
5 years	rr_AverageAnnualReturnYear05	4.41%
10 years	rr_AverageAnnualReturnYear10	4.20%
Western Asset Massachusetts Municipals Fund | Barclays Massachusetts Municipal Bond Index (reflects no deduction for fees, expenses or taxes)
Risk/Return:	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	6.03%	[6]
5 years	rr_AverageAnnualReturnYear05	5.95%	[6]
10 years	rr_AverageAnnualReturnYear10	5.11%	[6]
Western Asset Massachusetts Municipals Fund | Lipper Massachusetts Municipal Debt Funds Average (reflects no deduction for fees, expenses or taxes)
Risk/Return:	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	7.69%	[7]
5 years	rr_AverageAnnualReturnYear05	5.06%	[7]
10 years	rr_AverageAnnualReturnYear10	4.42%	[7]

[1] Generally,

[2] If your shares are held in a direct account and the value of your account is below $1,000, the fund may charge you a fee of $3.75 per account that is determined and assessed quarterly (with an annual maximum of $15.00 per account). Direct accounts generally include accounts held in the name of the individual investor on the fund's books and records.

[3] The manager has agreed to waive fees and/or reimburse operating expenses (other than interest, brokerage, taxes, extraordinary expenses and acquired fund fees and expenses) so that total annual operating expenses are not expected to exceed 0.75% for Class A shares, 1.30% for Class C shares, 0.85% for Class FI shares and 0.60% for Class I shares. These arrangements cannot be terminated prior to December 31, 2014 without the Board of Trustees' consent. The manager is permitted to recapture amounts waived and/or reimbursed to a class during the same fiscal year if the class' total annual operating expenses have fallen to a level below the limits described above.

[4] "Other expenses" for Class FI shares are estimated for the current fiscal year. Actual expenses may differ from estimates.

[5] N/A

[6] For Class I shares, for the period from June 3, 2008 to December 31, 2012, the average annual total return of the Barclays Massachusetts Municipal Bond Index was 6.09%.

[7] For Class I shares, for the period from June 30, 2008 to December 31, 2012, the average annual total return of the Lipper Massachusetts Municipal Debt Funds Average was 5.86%.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	LEGG MASON PARTNERS INCOME TRUST
Prospectus Date	rr_ProspectusDate	Mar. 31, 2013
Western Asset Intermediate Maturity California Municipals Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	Western Asset Intermediate Maturity California Municipals Fund
Objective [Heading]	rr_ObjectiveHeading	Investment objective
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The fund seeks to provide California investors with as high a level of current income exempt from federal income tax and California State personal income tax as is consistent with the preservation of principal.
Expense [Heading]	rr_ExpenseHeading	Fees and expenses of the fund
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	The accompanying table describes the fees and expenses that you may pay if you buy and hold shares of the fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in funds sold by Legg Mason Investor Services, LLC (“LMIS”), the fund’s distributor. More information about these and other discounts is available from your financial intermediary, in this Prospectus on page 22 under the heading “Sales charges” and in the fund’s statement of additional information (“SAI”) on page 63 under the heading “Sales Charge Waivers and Reductions.”
Shareholder Fees Caption [Text]	rr_ShareholderFeesCaption	Shareholder fees (fees paid directly from your investment)
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment) (%)
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	December 31, 2014
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	Portfolio turnover.
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	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 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 10% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	10.00%
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in funds sold by Legg Mason Investor Services, LLC (“LMIS”), the fund’s distributor.
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	100,000
Other Expenses, New Fund, Based on Estimates [Text]	rr_OtherExpensesNewFundBasedOnEstimates	“Other expenses” for Class FI shares are estimated for the current fiscal year. Actual expenses may differ from estimates.
Expense Example [Heading]	rr_ExpenseExampleHeading	Example
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	This 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: You invest $10,000 in the fund for the time periods indicated Your investment has a 5% return each year and the fund’s operating expenses remain the same You reinvest all distributions and dividends without a sales charge Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example by, Year, Caption [Text]	rr_ExpenseExampleByYearCaption	Number of years you own your shares ($)
Expense Example, No Redemption, By Year, Caption [Text]	rr_ExpenseExampleNoRedemptionByYearCaption	Number of years you own your shares ($)
Strategy [Heading]	rr_StrategyHeading	Principal investment strategies
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	Under normal circumstances, the fund invests at least 80% of its assets in investment grade "California municipal securities," or other investments with similar economic characteristics. California municipal securities are securities the interest on which is excluded from regular federal income tax and California State personal income taxes. The fund's 80% policy may not be changed without a shareholder vote. Interest on California municipal securities may be subject to the federal alternative minimum tax. California municipal securities include debt obligations issued by the State of California and its political subdivisions, agencies and public authorities, certain other governmental issuers (such as Puerto Rico, the U.S. Virgin Islands and Guam) and other qualifying issuers. These securities include participation or other interests in municipal securities issued or backed by banks, insurance companies and other financial institutions. Some municipal securities, such as general obligation issues, are backed by the issuer's taxing authority, while other municipal securities, such as revenue issues, are backed only by revenues from certain facilities or other sources and not by the issuer itself. The fund focuses on investment grade bonds (that is, securities rated in the Baa/BBB categories or above or, if unrated, determined to be of comparable credit quality by the subadviser) but may invest up to 20% of its assets in below investment grade bonds (commonly known as "junk bonds"). The fund may invest up to 20% of its assets in unrated securities that the subadviser determines to be equivalent to investment grade. The fund may invest in securities of any maturity. The fund normally maintains an average effective portfolio maturity of between three and ten years. The average effective portfolio maturity of the fund is a weighted average of all the maturities of the securities in the portfolio, computed by weighting each security's effective maturity, as estimated by the fund's subadviser, by the market value of the security. For the purposes of determining the fund's average effective maturity, a security's maturity date will generally be deemed to be the next interest rate reset date for an adjustable rate security or, if earlier, the date of the next demand feature such as a put feature, when the fund would be entitled to receive payment of principal and interest. The subadviser may also take into account estimated future prepayments on securities, such as mortgage-backed securities, with uncertain future cash flows and estimations of call features and similar features and options. These estimates may prove to be incorrect. Instead of, and/or in addition to, investing directly in particular securities, the fund may use instruments such as derivatives, including futures contracts, and synthetic instruments that are intended to provide economic exposure to the securities or the issuer. The fund may use one or more types of these instruments without limit, except that these instruments are taken into account when determining compliance with the fund's 80% policy. For additional information regarding derivatives, see "More on the fund's investment strategies, investments and risks—Derivatives" in this Prospectus. The fund may also engage in a variety of transactions using derivatives in order to change the investment characteristics of its portfolio (such as shortening or lengthening duration) and for other purposes. The fund is classified as "non-diversified," which means it may invest a larger percentage of its assets in a smaller number of issuers than a diversified fund.
Risk [Heading]	rr_RiskHeading	Certain risks
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	Risk is inherent in all investing. There is no assurance that the fund will meet its investment objective. The value of your investment in the fund, as well as the amount of return you receive on your investment, may fluctuate significantly. You may lose part or all of your investment in the fund or your investment may not perform as well as other similar investments. The following is a summary description of certain risks of investing in the fund. Market and interest rate risk. The market prices of the fund’s securities may go up or down, sometimes rapidly or unpredictably, due to general market conditions, such as real or perceived adverse economic or political conditions, inflation, changes in interest rates, lack of liquidity in the bond markets or adverse investor sentiment. When market prices fall, the value of your investment will go down. The value of your investment may also go down when interest rates rise. A rise in rates tends to have a greater impact on the prices of longer term or duration securities. The financial crisis that began in 2008 has caused a significant decline in the value and liquidity of many securities of issuers worldwide. In response to the crisis, the U.S. and other governments and the Federal Reserve and certain foreign central banks have taken steps to support financial markets. The withdrawal of this support, failure of efforts in response to the crisis, or investor perception that these efforts are not succeeding could negatively affect financial markets generally as well as the value and liquidity of certain securities. In addition, policy and legislative changes in the United States and in other countries are changing many aspects of financial regulation. The impact of these changes on the markets, and the practical implications for market participants, may not be fully known for some time. Credit risk. If an issuer or guarantor of a security held by the fund or a counterparty to a financial contract with the fund defaults or is downgraded, or is perceived to be less creditworthy, or if the value of the assets underlying a security declines, the value of your investment will typically decline. Junk bonds have a higher risk of default and are considered speculative. Subordinated securities are more likely to suffer a credit loss than non-subordinated securities of the same issuer and will be disproportionately affected by a default, downgrade or perceived decline in creditworthiness. Derivatives risk. Using derivatives can increase fund losses and reduce opportunities for gains when market prices, interest rates or the derivative instruments themselves behave in a way not anticipated by the fund. Using derivatives also can have a leveraging effect and increase fund volatility. Derivatives may be difficult to sell, unwind or value, and the counterparty may default on its obligations to the fund. Recent legislation calls for new regulation of the derivatives markets. The extent and impact of the regulation are not yet fully known and may not be for some time. New regulation of derivatives may make them more costly, may limit their availability, or may otherwise adversely affect their value or performance. Leveraging risk. The value of your investment may be more volatile if the fund borrows or uses derivatives or other investments that have a leveraging effect on the fund’s portfolio. Other risks also will be compounded. This is because leverage generally magnifies the effect of a change in the value of an asset and creates a risk of loss of value on a larger pool of assets than the fund would otherwise have had, potentially resulting in the loss of all assets. The fund may also have to sell assets at inopportune times to satisfy its obligations. Liquidity risk. Some assets held by the fund may be difficult to sell, or illiquid, particularly during times of market turmoil. Illiquid assets may also be difficult to value. If the fund is forced to sell an illiquid asset to meet redemption requests or other cash needs, the fund may be forced to sell at a loss. Risk of increase in expenses. Your actual costs of investing in the fund may be higher than the expenses shown in “Annual fund operating expenses” for a variety of reasons. For example, expense ratios may be higher than those shown if a fee limitation is changed or terminated or if average net assets decrease. Net assets are more likely to decrease and fund expense ratios are more likely to increase when markets are volatile. Tax risk. The income on the fund’s municipal securities could become subject to regular federal income and California State personal income taxes due to noncompliant conduct by issuers, unfavorable legislation or litigation or adverse interpretations by regulatory authorities. Prepayment or call risk. Many issuers have a right to prepay their securities. If interest rates fall, an issuer may exercise this right. If this happens, the fund will be forced to reinvest prepayment proceeds at a time when yields on securities available in the market are lower than the yield on the prepaid security. The fund also may lose any premium it paid on the security. Extension risk. If interest rates rise, repayments of fixed income securities may occur more slowly than anticipated by the market. This may drive the prices of these securities down because their interest rates are lower than the current interest rate and they remain outstanding longer. Non-diversification risk. The fund is classified as “non-diversified,” which means it may invest a larger percentage of its assets in a smaller number of issuers than a diversified fund. To the extent the fund invests its assets in a smaller number of issuers, the fund will be more susceptible to negative events affecting those issuers than a diversified fund. Risks relating to investments in municipal securities. Municipal issuers may be adversely affected by rising health care costs, increasing unfunded pension liabilities, and by the phasing out of federal programs providing financial support. Unfavorable conditions and developments relating to projects financed with municipal securities can result in lower revenues to issuers of municipal securities. Issuers often depend on revenues from these projects to make principal and interest payments. The value of municipal securities can also be adversely affected by changes in the financial condition of one or more individual municipal issuers or insurers of municipal issuers, regulatory and political developments, tax law changes or other legislative actions, and by uncertainties and public perceptions concerning these and other factors. Risks associated with focusing on investments in California municipal securities. The fund focuses its investments on California municipal securities. The fund may be affected significantly by adverse economic, political or other events affecting California municipal issuers. The recent economic downturn has had a severe and negative impact on the State of California, causing a significant deterioration in California's economic base. California's economic and fiscal problems heighten the risks of investing in California municipal securities, including the risks of downgrades, market illiquidity and issuer defaults. Also, the fund may be more volatile than a more geographically diverse fund. Valuation risk. The sales price the fund could receive for any particular portfolio investment may differ from the fund’s valuation of the investment, particularly for securities that trade in thin or volatile markets or that are valued using a fair value methodology. Investors who purchase or redeem fund shares on days when the fund is holding fair-valued securities may receive fewer or more shares or lower or higher redemption proceeds than they would have received if the fund had not fair-valued the security or had used a different valuation methodology. Cash management and defensive investing risk. The value of the investments held by the fund for cash management or defensive investing purposes can fluctuate. Like other fixed income securities, they are subject to risk, including market, interest rate and credit risk. If the fund holds cash uninvested it will be subject to the credit risk of the depository institution holding the cash. If the fund holds cash uninvested, the fund will not earn income on the cash and the fund’s yield will go down. If a significant amount of the fund’s assets are used for cash management or defensive investing purposes, it may not achieve its investment objective. Portfolio selection risk. The value of your investment may decrease if the subadviser’s judgment about the quality, relative yield, value or market trends affecting a particular security, industry, sector or region, or about interest rates, is incorrect. Not a money market fund. The fund is not a money market fund and is not subject to the strict rules that govern the quality, maturity, liquidity and other features of securities that money market funds may purchase. Under normal conditions, the fund’s investment may be more susceptible than a money market fund to interest rate risk, valuation risk, credit risk and other risks relevant to the fund’s investments. The fund does not attempt to maintain a stable net asset value. Therefore, the fund’s net asset value per share will fluctuate. These risks are discussed in more detail later in this Prospectus or in the SAI.
Risk Lose Money [Text]	rr_RiskLoseMoney	You may lose part or all of your investment in the fund or your investment may not perform as well as other similar investments.
Risk Nondiversified Status [Text]	rr_RiskNondiversifiedStatus	Non-diversification risk. The fund is classified as “non-diversified,” which means it may invest a larger percentage of its assets in a smaller number of issuers than a diversified fund. To the extent the fund invests its assets in a smaller number of issuers, the fund will be more susceptible to negative events affecting those issuers than a diversified fund.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	Performance
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The accompanying 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 the average annual total returns of each class of the fund that has been in operation for at least one full calendar year and also compares the fund’s performance with the average annual total returns of an index or other benchmark and an average. Performance for classes other than those shown may vary from the performance shown to the extent the expenses for those classes differ. The fund makes updated performance information available at the fund’s website, http://www.leggmason.com/individualinvestors/products/mutual-funds/annualized_performance (select share class), or by calling the fund at 1-877-721-1926. The fund’s past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. Sales charges are not reflected in the accompanying bar chart, and if those charges were included, returns would be less than those shown.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	The bar chart shows changes in the fund’s performance from year to year for Class A shares. The table shows the average annual total returns of each class of the fund that has been in operation for at least one full calendar year and also compares the fund’s performance with the average annual total returns of an index or other benchmark and an average. Performance for classes other than those shown may vary from the performance shown to the extent the expenses for those classes differ.
Performance Availability Phone [Text]	rr_PerformanceAvailabilityPhone	1-877-721-1926
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	http://www.leggmason.com/individualinvestors/products/mutual-funds/annualized_performance (select share class)
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	The fund’s past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future.
Bar Chart [Heading]	rr_BarChartHeading	Total returns (before taxes) (%)
Bar Chart Does Not Reflect Sales Loads [Text]	rr_BarChartDoesNotReflectSalesLoads	Sales charges are not reflected in the accompanying bar chart, and if those charges were included, returns would be less than those shown.
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Calendar Years ended December 31 Best quarter (09/30/2009): 6.64 Worst quarter (12/31/2010): (4.87)
Performance Table Heading	rr_PerformanceTableHeading	Average annual total returns (for periods ended December 31, 2012) (%)
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	The after-tax returns are shown only for Class A shares, are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table One Class of after Tax Shown [Text]	rr_PerformanceTableOneClassOfAfterTaxShown	After-tax returns for classes other than Class A will vary from returns shown for Class A.
Performance Table Narrative	rr_PerformanceTableNarrativeTextBlock	The after-tax returns are shown only for Class A shares, 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 for classes other than Class A will vary from returns shown for Class A.
Western Asset Intermediate Maturity California Municipals Fund | Class A
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a % of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	2.25%
Maximum deferred sales charge (load) (as a % of the lower of net asset value at purchase or redemption)	rr_MaximumDeferredSalesChargeOverOther	none	[1]
Small account fee ($)	rr_MaximumAccountFee	15	[2]
Management fees	rr_ManagementFeesOverAssets	0.50%
Distribution and service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.15%
Other expenses	rr_OtherExpensesOverAssets	0.11%
Total annual fund operating expenses	rr_ExpensesOverAssets	0.76%
Fees waived and/or expenses reimbursed	rr_FeeWaiverOrReimbursementOverAssets	(0.01%)	[3]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses	rr_NetExpensesOverAssets	0.75%
1 year	rr_ExpenseExampleYear01	300
3 years	rr_ExpenseExampleYear03	461
5 years	rr_ExpenseExampleYear05	637
10 years	rr_ExpenseExampleYear10	1,144
1 year	rr_ExpenseExampleNoRedemptionYear01	300
3 years	rr_ExpenseExampleNoRedemptionYear03	461
5 years	rr_ExpenseExampleNoRedemptionYear05	637
10 years	rr_ExpenseExampleNoRedemptionYear10	1,144
2003	rr_AnnualReturn2003	3.43%
2004	rr_AnnualReturn2004	2.38%
2005	rr_AnnualReturn2005	2.01%
2006	rr_AnnualReturn2006	4.40%
2007	rr_AnnualReturn2007	3.84%
2008	rr_AnnualReturn2008	(3.91%)
2009	rr_AnnualReturn2009	11.27%
2010	rr_AnnualReturn2010	0.37%
2011	rr_AnnualReturn2011	10.15%
2012	rr_AnnualReturn2012	5.92%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best quarter
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Sep. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	6.64%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst quarter
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2010
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(4.87%)
1 year	rr_AverageAnnualReturnYear01	3.48%
5 years	rr_AverageAnnualReturnYear05	4.13%
10 years	rr_AverageAnnualReturnYear10	3.66%
Western Asset Intermediate Maturity California Municipals Fund | Class C
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a % of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) (as a % of the lower of net asset value at purchase or redemption)	rr_MaximumDeferredSalesChargeOverOther	none
Small account fee ($)	rr_MaximumAccountFee	15	[2]
Management fees	rr_ManagementFeesOverAssets	0.50%
Distribution and service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.75%
Other expenses	rr_OtherExpensesOverAssets	0.10%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.35%
Fees waived and/or expenses reimbursed	rr_FeeWaiverOrReimbursementOverAssets		[3]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses	rr_NetExpensesOverAssets	1.35%
1 year	rr_ExpenseExampleYear01	137
3 years	rr_ExpenseExampleYear03	427
5 years	rr_ExpenseExampleYear05	739
10 years	rr_ExpenseExampleYear10	1,623
1 year	rr_ExpenseExampleNoRedemptionYear01	137
3 years	rr_ExpenseExampleNoRedemptionYear03	427
5 years	rr_ExpenseExampleNoRedemptionYear05	739
10 years	rr_ExpenseExampleNoRedemptionYear10	1,623
1 year	rr_AverageAnnualReturnYear01	5.29%
5 years	rr_AverageAnnualReturnYear05	3.99%
10 years	rr_AverageAnnualReturnYear10	3.24%
Western Asset Intermediate Maturity California Municipals Fund | Class FI
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a % of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) (as a % of the lower of net asset value at purchase or redemption)	rr_MaximumDeferredSalesChargeOverOther	none
Small account fee ($)	rr_MaximumAccountFee	none	[2]
Management fees	rr_ManagementFeesOverAssets	0.50%
Distribution and service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	0.36%	[4]
Total annual fund operating expenses	rr_ExpensesOverAssets	1.11%
Fees waived and/or expenses reimbursed	rr_FeeWaiverOrReimbursementOverAssets	(0.26%)	[3]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses	rr_NetExpensesOverAssets	0.85%
1 year	rr_ExpenseExampleYear01	87
3 years	rr_ExpenseExampleYear03	327
5 years	rr_ExpenseExampleYear05	586
10 years	rr_ExpenseExampleYear10	1,328
1 year	rr_ExpenseExampleNoRedemptionYear01	87
3 years	rr_ExpenseExampleNoRedemptionYear03	327
5 years	rr_ExpenseExampleNoRedemptionYear05	586
10 years	rr_ExpenseExampleNoRedemptionYear10	1,328
Western Asset Intermediate Maturity California Municipals Fund | Class I
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a % of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) (as a % of the lower of net asset value at purchase or redemption)	rr_MaximumDeferredSalesChargeOverOther	none
Small account fee ($)	rr_MaximumAccountFee	none	[2]
Management fees	rr_ManagementFeesOverAssets	0.50%
Distribution and service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.16%
Total annual fund operating expenses	rr_ExpensesOverAssets	0.66%
Fees waived and/or expenses reimbursed	rr_FeeWaiverOrReimbursementOverAssets	(0.06%)	[3]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses	rr_NetExpensesOverAssets	0.60%
1 year	rr_ExpenseExampleYear01	61
3 years	rr_ExpenseExampleYear03	204
5 years	rr_ExpenseExampleYear05	361
10 years	rr_ExpenseExampleYear10	816
1 year	rr_ExpenseExampleNoRedemptionYear01	61
3 years	rr_ExpenseExampleNoRedemptionYear03	204
5 years	rr_ExpenseExampleNoRedemptionYear05	361
10 years	rr_ExpenseExampleNoRedemptionYear10	816
1 year	rr_AverageAnnualReturnYear01	5.95%
5 years	rr_AverageAnnualReturnYear05	4.76%
10 years	rr_AverageAnnualReturnYear10	4.08%
Western Asset Intermediate Maturity California Municipals Fund | Return after taxes on distributions | Class A
Risk/Return:	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	3.48%
5 years	rr_AverageAnnualReturnYear05	4.13%
10 years	rr_AverageAnnualReturnYear10	3.66%
Western Asset Intermediate Maturity California Municipals Fund | Return after taxes on distributions and sale of fund shares | Class A
Risk/Return:	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	3.40%
5 years	rr_AverageAnnualReturnYear05	4.05%
10 years	rr_AverageAnnualReturnYear10	3.64%
Western Asset Intermediate Maturity California Municipals Fund | Barclays California Intermediate Municipal Bond Index (reflects no deductions for fees, expenses or taxes)
Risk/Return:	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	5.14%
5 years	rr_AverageAnnualReturnYear05	6.35%
10 years	rr_AverageAnnualReturnYear10	5.12%
Western Asset Intermediate Maturity California Municipals Fund | Lipper California Intermediate Municipals Debt Funds Average (reflects fees and expenses but no deduction for sales charges or taxes)
Risk/Return:	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	5.03%
5 years	rr_AverageAnnualReturnYear05	4.65%
10 years	rr_AverageAnnualReturnYear10	3.76%

[1] Generally,

[2] If your shares are held in a direct account and the value of your account is below $1,000, the fund may charge you a fee of $3.75 per account that is determined and assessed quarterly (with an annual maximum of $15.00 per account). Direct accounts generally include accounts held in the name of the individual investor on the fund's books and records.

[3] The manager has agreed to waive fees and/or reimburse operating expenses (other than interest, brokerage, taxes, extraordinary expenses and acquired fund fees and expenses) so that total annual operating expenses are not expected to exceed 0.75% for Class A shares, 1.35% for Class C shares, 0.85% for Class FI shares and 0.60% for Class I shares. These arrangements cannot be terminated prior to December 31, 2014 without the Board of Trustees' consent. The manager is permitted to recapture amounts waived and/or reimbursed to a class during the same fiscal year if the class' total annual operating expenses have fallen to a level below the limits described above.

[4] "Other expenses" for Class FI shares are estimated for the current fiscal year. Actual expenses may differ from estimates.

XML

Western Asset Intermediate Maturity California Municipals Fund

Western Asset
Intermediate Maturity
California Municipals
Fund

Investment objective

The fund seeks to provide California investors with as high a level of current income exempt from federal income tax and California State personal income tax as is consistent with the preservation of principal.

Fees and expenses of the fund

The accompanying table describes the fees and expenses that you may pay if you buy and hold shares of the fund.

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in funds sold by Legg Mason Investor Services, LLC (“LMIS”), the fund’s distributor. More information about these and other discounts is available from your financial intermediary, in this Prospectus on page 22 under the heading “Sales charges” and in the fund’s statement of additional information (“SAI”) on page 63 under the heading “Sales Charge Waivers and Reductions.”

Shareholder fees (fees paid directly from your investment)

Shareholder Fees Western Asset Intermediate Maturity California Municipals Fund (USD $)		Class A		Class C	Class FI	Class I
Maximum sales charge (load) imposed on purchases (as a % of offering price)		2.25%		none	none	none
Maximum deferred sales charge (load) (as a % of the lower of net asset value at purchase or redemption)		none	[1]	none	none	none
Small account fee ($)	[2]	15		15	none	none

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of
your investment) (%)

Annual Fund Operating Expenses Western Asset Intermediate Maturity California Municipals Fund		Class A	Class C	Class FI		Class I
Management fees		0.50%	0.50%	0.50%		0.50%
Distribution and service (12b-1) fees		0.15%	0.75%	0.25%		none
Other expenses		0.11%	0.10%	0.36%	[1]	0.16%
Total annual fund operating expenses		0.76%	1.35%	1.11%		0.66%
Fees waived and/or expenses reimbursed	[2]	(0.01%)		(0.26%)		(0.06%)
Total annual fund operating expenses after waiving fees and/or reimbursing expenses		0.75%	1.35%	0.85%		0.60%

Example

This 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:

• You invest $10,000 in the fund for the time periods indicated

• Your investment has a 5% return each year and the fund’s operating expenses remain the same

• You reinvest all distributions and dividends without a sales charge

Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Number of years you own your shares ($)

Expense Example Western Asset Intermediate Maturity California Municipals Fund (USD $)	1 year	3 years	5 years	10 years
Class A	300	461	637	1,144
Class C	137	427	739	1,623
Class FI	87	327	586	1,328
Class I	61	204	361	816

Number of years you own your shares ($)

Expense Example, No Redemption Western Asset Intermediate Maturity California Municipals Fund (USD $)	1 year	3 years	5 years	10 years
Class A	300	461	637	1,144
Class C	137	427	739	1,623
Class FI	87	327	586	1,328
Class I	61	204	361	816

Portfolio turnover.

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 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 10% of the average value of its portfolio.

Principal investment strategies

Under normal circumstances, the fund invests at least 80% of its assets in investment grade "California municipal securities," or other investments with similar economic characteristics. California municipal securities are securities the interest on which is excluded from regular federal income tax and California State personal income taxes. The fund's 80% policy may not be changed without a shareholder vote. Interest on California municipal securities may be subject to the federal alternative minimum tax.

California municipal securities include debt obligations issued by the State of California and its political subdivisions, agencies and public authorities, certain other governmental issuers (such as Puerto Rico, the U.S. Virgin Islands and Guam) and other qualifying issuers. These securities include participation or other interests in municipal securities issued or backed by banks, insurance companies and other financial institutions.

Some municipal securities, such as general obligation issues, are backed by the issuer's taxing authority, while other municipal securities, such as revenue issues, are backed only by revenues from certain facilities or other sources and not by the issuer itself.

The fund focuses on investment grade bonds (that is, securities rated in the Baa/BBB categories or above or, if unrated, determined to be of comparable credit quality by the subadviser) but may invest up to 20% of its assets in below investment grade bonds (commonly known as "junk bonds").

The fund may invest up to 20% of its assets in unrated securities that the subadviser determines to be equivalent to investment grade.

The fund may invest in securities of any maturity. The fund normally maintains an average effective portfolio maturity of between three and ten years. The average effective portfolio maturity of the fund is a weighted average of all the maturities of the securities in the portfolio, computed by weighting each security's effective maturity, as estimated by the fund's subadviser, by the market value of the security. For the purposes of determining the fund's average effective maturity, a security's maturity date will generally be deemed to be the next interest rate reset date for an adjustable rate security or, if earlier, the date of the next demand feature such as a put feature, when the fund would be entitled to receive payment of principal and interest. The subadviser may also take into account estimated future prepayments on securities, such as mortgage-backed securities, with uncertain future cash flows and estimations of call features and similar features and options. These estimates may prove to be incorrect.

Instead of, and/or in addition to, investing directly in particular securities, the fund may use instruments such as derivatives, including futures contracts, and synthetic instruments that are intended to provide economic exposure to the securities or the issuer. The fund may use one or more types of these instruments without limit, except that these instruments are taken into account when determining compliance with the fund's 80% policy. For additional information regarding derivatives, see "More on the fund's investment strategies, investments and risks—Derivatives" in this Prospectus.

The fund may also engage in a variety of transactions using derivatives in order to change the investment characteristics of its portfolio (such as shortening or lengthening duration) and for other purposes.

The fund is classified as "non-diversified," which means it may invest a larger percentage of its assets in a smaller number of issuers than a diversified fund.

Certain risks

Risk is inherent in all investing. There is no assurance that the fund will meet its investment objective. The value of your investment in the fund, as well as the amount of return you receive on your investment, may fluctuate significantly. You may lose part or all of your investment in the fund or your investment may not perform as well as other similar investments. The following is a summary description of certain risks of investing in the fund.

Market and interest rate risk. The market prices of the fund’s securities may go up or down, sometimes rapidly or unpredictably, due to general market conditions, such as real or perceived adverse economic or political conditions, inflation, changes in interest rates, lack of liquidity in the bond markets or adverse investor sentiment. When market prices fall, the value of your investment will go down. The value of your investment may also go down when interest rates rise. A rise in rates tends to have a greater impact on the prices of longer term or duration securities. The financial crisis that began in 2008 has caused a significant decline in the value and liquidity of many securities of issuers worldwide. In response to the crisis, the U.S. and other governments and the Federal Reserve and certain foreign central banks have taken steps to support financial markets. The withdrawal of this support, failure of efforts in response to the crisis, or investor perception that these efforts are not succeeding could negatively affect financial markets generally as well as the value and liquidity of certain securities. In addition, policy and legislative changes in the United States and in other countries are changing many aspects of financial regulation. The impact of these changes on the markets, and the practical implications for market participants, may not be fully known for some time.

Credit risk. If an issuer or guarantor of a security held by the fund or a counterparty to a financial contract with the fund defaults or is downgraded, or is perceived to be less creditworthy, or if the value of the assets underlying a security declines, the value of your investment will typically decline. Junk bonds have a higher risk of default and are considered speculative. Subordinated securities are more likely to suffer a credit loss than non-subordinated securities of the same issuer and will be disproportionately affected by a default, downgrade or perceived decline in creditworthiness.

Derivatives risk. Using derivatives can increase fund losses and reduce opportunities for gains when market prices, interest rates or the derivative instruments themselves behave in a way not anticipated by the fund. Using derivatives also can have a leveraging effect and increase fund volatility. Derivatives may be difficult to sell, unwind or value, and the counterparty may default on its obligations to the fund. Recent legislation calls for new regulation of the derivatives markets. The extent and impact of the regulation are not yet fully known and may not be for some time. New regulation of derivatives may make them more costly, may limit their availability, or may otherwise adversely affect their value or performance.

Leveraging risk. The value of your investment may be more volatile if the fund borrows or uses derivatives or other investments that have a leveraging effect on the fund’s portfolio. Other risks also will be compounded. This is because leverage generally magnifies the effect of a change in the value of an asset and creates a risk of loss of value on a larger pool of assets than the fund would otherwise have had, potentially resulting in the loss of all assets. The fund may also have to sell assets at inopportune times to satisfy its obligations.

Liquidity risk. Some assets held by the fund may be difficult to sell, or illiquid, particularly during times of market turmoil. Illiquid assets may also be difficult to value. If the fund is forced to sell an illiquid asset to meet redemption requests or other cash needs, the fund may be forced to sell at a loss.

Risk of increase in expenses. Your actual costs of investing in the fund may be higher than the expenses shown in “Annual fund operating expenses” for a variety of reasons. For example, expense ratios may be higher than those shown if a fee limitation is changed or terminated or if average net assets decrease. Net assets are more likely to decrease and fund expense ratios are more likely to increase when markets are volatile.

Tax risk. The income on the fund’s municipal securities could become subject to regular federal income and California State personal income taxes due to noncompliant conduct by issuers, unfavorable legislation or litigation or adverse interpretations by regulatory authorities.

Prepayment or call risk. Many issuers have a right to prepay their securities. If interest rates fall, an issuer may exercise this right. If this happens, the fund will be forced to reinvest prepayment proceeds at a time when yields on securities available in the market are lower than the yield on the prepaid security. The fund also may lose any premium it paid on the security.

Extension risk. If interest rates rise, repayments of fixed income securities may occur more slowly than anticipated by the market. This may drive the prices of these securities down because their interest rates are lower than the current interest rate and they remain outstanding longer.

Non-diversification risk. The fund is classified as “non-diversified,” which means it may invest a larger percentage of its assets in a smaller number of issuers than a diversified fund. To the extent the fund invests its assets in a smaller number of issuers, the fund will be more susceptible to negative events affecting those issuers than a diversified fund.

Risks relating to investments in municipal securities. Municipal issuers may be adversely affected by rising health care costs, increasing unfunded pension liabilities, and by the phasing out of federal programs providing financial support. Unfavorable conditions and developments relating to projects financed with municipal securities can result in lower revenues to issuers of municipal securities. Issuers often depend on revenues from these projects to make principal and interest payments. The value of municipal securities can also be adversely affected by changes in the financial condition of one or more individual municipal issuers or insurers of municipal issuers, regulatory and political developments, tax law changes or other legislative actions, and by uncertainties and public perceptions concerning these and other factors.

Risks associated with focusing on investments in California municipal securities. The fund focuses its investments on California municipal securities. The fund may be affected significantly by adverse economic, political or other events affecting California municipal issuers. The recent economic downturn has had a severe and negative impact on the State of California, causing a significant deterioration in California's economic base. California's economic and fiscal problems heighten the risks of investing in California municipal securities, including the risks of downgrades, market illiquidity and issuer defaults. Also, the fund may be more volatile than a more geographically diverse fund.

Valuation risk. The sales price the fund could receive for any particular portfolio investment may differ from the fund’s valuation of the investment, particularly for securities that trade in thin or volatile markets or that are valued using a fair value methodology. Investors who purchase or redeem fund shares on days when the fund is holding fair-valued securities may receive fewer or more shares or lower or higher redemption proceeds than they would have received if the fund had not fair-valued the security or had used a different valuation methodology.

Cash management and defensive investing risk. The value of the investments held by the fund for cash management or defensive investing purposes can fluctuate. Like other fixed income securities, they are subject to risk, including market, interest rate and credit risk. If the fund holds cash uninvested it will be subject to the credit risk of the depository institution holding the cash. If the fund holds cash uninvested, the fund will not earn income on the cash and the fund’s yield will go down. If a significant amount of the fund’s assets are used for cash management or defensive investing purposes, it may not achieve its investment objective.

Portfolio selection risk. The value of your investment may decrease if the subadviser’s judgment about the quality, relative yield, value or market trends affecting a particular security, industry, sector or region, or about interest rates, is incorrect.

Not a money market fund. The fund is not a money market fund and is not subject to the strict rules that govern the quality, maturity, liquidity and other features of securities that money market funds may purchase. Under normal conditions, the fund’s investment may be more susceptible than a money market fund to interest rate risk, valuation risk, credit risk and other risks relevant to the fund’s investments. The fund does not attempt to maintain a stable net asset value. Therefore, the fund’s net asset value per share will fluctuate.

These risks are discussed in more detail later in this Prospectus or in the SAI.

Performance

The accompanying 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 the average annual total returns of each class of the fund that has been in operation for at least one full calendar year and also compares the fund’s performance with the average annual total returns of an index or other benchmark and an average. Performance for classes other than those shown may vary from the performance shown to the extent the expenses for those classes differ. The fund makes updated performance information available at the fund’s website, http://www.leggmason.com/individualinvestors/products/mutual-funds/annualized_performance (select share class), or by calling the fund at 1-877-721-1926.

The fund’s past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future.

Sales charges are not reflected in the accompanying bar chart, and if those charges were included, returns would be less than those shown.

Total returns (before taxes) (%)

Calendar Years ended December 31

Best quarter
(09/30/2009): 6.64

Worst quarter
(12/31/2010): (4.87)

Average annual total returns (for periods ended December 31, 2012) (%)

Average Annual Total Returns Western Asset Intermediate Maturity California Municipals Fund	1 year	5 years	10 years
Class A	3.48%	4.13%	3.66%
Class A Return after taxes on distributions	3.48%	4.13%	3.66%
Class A Return after taxes on distributions and sale of fund shares	3.40%	4.05%	3.64%
Class C	5.29%	3.99%	3.24%
Class I	5.95%	4.76%	4.08%
Barclays California Intermediate Municipal Bond Index (reflects no deductions for fees, expenses or taxes)	5.14%	6.35%	5.12%
Lipper California Intermediate Municipals Debt Funds Average (reflects fees and expenses but no deduction for sales charges or taxes)	5.03%	4.65%	3.76%

The after-tax returns are shown only for Class A shares, 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 for classes other than Class A will vary from returns shown for Class A.

[1] Generally,

[2] If your shares are held in a direct account and the value of your account is below $1,000, the fund may charge you a fee of $3.75 per account that is determined and assessed quarterly (with an annual maximum of $15.00 per account). Direct accounts generally include accounts held in the name of the individual investor on the fund's books and records.

[1] "Other expenses" for Class FI shares are estimated for the current fiscal year. Actual expenses may differ from estimates.

[2] The manager has agreed to waive fees and/or reimburse operating expenses (other than interest, brokerage, taxes, extraordinary expenses and acquired fund fees and expenses) so that total annual operating expenses are not expected to exceed 0.75% for Class A shares, 1.35% for Class C shares, 0.85% for Class FI shares and 0.60% for Class I shares. These arrangements cannot be terminated prior to December 31, 2014 without the Board of Trustees' consent. The manager is permitted to recapture amounts waived and/or reimbursed to a class during the same fiscal year if the class' total annual operating expenses have fallen to a level below the limits described above.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	LEGG MASON PARTNERS INCOME TRUST
Prospectus Date	rr_ProspectusDate	Mar. 31, 2013
Western Asset Intermediate Maturity New York Municipals Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	Western Asset Intermediate Maturity New York Municipals Fund
Objective [Heading]	rr_ObjectiveHeading	Investment objective
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The fund seeks to provide New York investors with as high a level of current income exempt from federal income tax and New York State and New York City personal income taxes as is consistent with the preservation of principal.
Expense [Heading]	rr_ExpenseHeading	Fees and expenses of the fund
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	The accompanying table describes the fees and expenses that you may pay if you buy and hold shares of the fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in funds sold by Legg Mason Investor Services, LLC (“LMIS”), the fund’s distributor. More information about these and other discounts is available from your financial intermediary, in this Prospectus on page 22 under the heading “Sales charges” and in the fund’s statement of additional information (“SAI”) on page 63 under the heading “Sales Charge Waivers and Reductions.”
Shareholder Fees Caption [Text]	rr_ShareholderFeesCaption	Shareholder fees (fees paid directly from your investment)
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment) (%)
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	December 31, 2014
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	Portfolio turnover.
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	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 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 8% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	8.00%
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in funds sold by Legg Mason Investor Services, LLC (“LMIS”), the fund’s distributor.
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	100,000
Other Expenses, New Fund, Based on Estimates [Text]	rr_OtherExpensesNewFundBasedOnEstimates	“Other expenses” for Class FI shares are estimated for the current fiscal year. Actual expenses may differ from estimates.
Expense Example [Heading]	rr_ExpenseExampleHeading	Example
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	This 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: You invest $10,000 in the fund for the time periods indicated Your investment has a 5% return each year and the fund’s operating expenses remain the same You reinvest all distributions and dividends without a sales charge Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example by, Year, Caption [Text]	rr_ExpenseExampleByYearCaption	Number of years you own your shares ($)
Expense Example, No Redemption, By Year, Caption [Text]	rr_ExpenseExampleNoRedemptionByYearCaption	Number of years you own your shares ($)
Strategy [Heading]	rr_StrategyHeading	Principal investment strategies
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	Under normal circumstances, the fund invests at least 80% of its assets in investment grade "New York municipal securities" or other investments with similar economic characteristics. New York municipal securities are securities the interest on which is excluded from regular federal income tax and New York State and New York City personal income taxes. The fund's 80% policy may not be changed without a shareholder vote. Interest on New York municipal securities may be subject to the federal alternative minimum tax. New York municipal securities include debt obligations issued by the State of New York and its political subdivisions, agencies and public authorities, certain other governmental issuers (such as Puerto Rico, the U.S. Virgin Islands and Guam) and other qualifying issuers. These securities include participation or other interests in municipal securities issued or backed by banks, insurance companies and other financial institutions. Some municipal securities, such as general obligation issues, are backed by the issuer's taxing authority, while other municipal securities, such as revenue issues, are backed only by revenues from certain facilities or other sources and not by the issuer itself. The fund focuses on investment grade bonds (that is, securities rated in the Baa/BBB categories or above or, if unrated, determined to be of comparable credit quality by the subadviser) but may invest up to 20% of its assets in below investment grade bonds (commonly known as "junk bonds"). The fund may invest up to 20% of its assets in unrated securities that the subadviser determines to be equivalent to investment grade. The fund may invest in securities of any maturity. The fund normally maintains an average effective portfolio maturity of between three and ten years. The average effective portfolio maturity of the fund is a weighted average of all the maturities of the securities in the portfolio, computed by weighting each security's effective maturity, as estimated by the fund's subadviser, by the market value of the security. For the purposes of determining the fund's average effective maturity, a security's maturity date will generally be deemed to be the next interest rate reset date for an adjustable rate security or, if earlier, the date of the next demand feature such as a put feature, when the fund would be entitled to receive payment of principal and interest. The subadviser may also take into account estimated future prepayments on securities, such as mortgage-backed securities, with uncertain future cash flows and estimations of call features and similar features and options. These estimates may prove to be incorrect. Instead of, and/or in addition to, investing directly in particular securities, the fund may use instruments such as derivatives, including futures contracts, and synthetic instruments that are intended to provide economic exposure to the securities or the issuer. The fund may use one or more types of these instruments without limit, except that these instruments are taken into account when determining compliance with the fund's 80% policy. For additional information regarding derivatives, see "More on the fund's investment strategies, investments and risks—Derivatives" in this Prospectus. The fund may also engage in a variety of transactions using derivatives in order to change the investment characteristics of its portfolio (such as shortening or lengthening duration) and for other purposes. The fund is classified as "non-diversified," which means it may invest a larger percentage of its assets in a smaller number of issuers than a diversified fund.
Risk [Heading]	rr_RiskHeading	Certain risks
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	Risk is inherent in all investing. There is no assurance that the fund will meet its investment objective. The value of your investment in the fund, as well as the amount of return you receive on your investment, may fluctuate significantly. You may lose part or all of your investment in the fund or your investment may not perform as well as other similar investments. The following is a summary description of certain risks of investing in the fund. Market and interest rate risk. The market prices of the fund’s securities may go up or down, sometimes rapidly or unpredictably, due to general market conditions, such as real or perceived adverse economic or political conditions, inflation, changes in interest rates, lack of liquidity in the bond markets or adverse investor sentiment. When market prices fall, the value of your investment will go down. The value of your investment may also go down when interest rates rise. A rise in rates tends to have a greater impact on the prices of longer term or duration securities. The financial crisis that began in 2008 has caused a significant decline in the value and liquidity of many securities of issuers worldwide. In response to the crisis, the U.S. and other governments and the Federal Reserve and certain foreign central banks have taken steps to support financial markets. The withdrawal of this support, failure of efforts in response to the crisis, or investor perception that these efforts are not succeeding could negatively affect financial markets generally as well as the value and liquidity of certain securities. In addition, policy and legislative changes in the United States and in other countries are changing many aspects of financial regulation. The impact of these changes on the markets, and the practical implications for market participants, may not be fully known for some time. Credit risk. If an issuer or guarantor of a security held by the fund or a counterparty to a financial contract with the fund defaults or is downgraded, or is perceived to be less creditworthy, or if the value of the assets underlying a security declines, the value of your investment will typically decline. Junk bonds have a higher risk of default and are considered speculative. Subordinated securities are more likely to suffer a credit loss than non-subordinated securities of the same issuer and will be disproportionately affected by a default, downgrade or perceived decline in creditworthiness. Derivatives risk. Using derivatives can increase fund losses and reduce opportunities for gains when market prices, interest rates or the derivative instruments themselves behave in a way not anticipated by the fund. Using derivatives also can have a leveraging effect and increase fund volatility. Derivatives may be difficult to sell, unwind or value, and the counterparty may default on its obligations to the fund. Recent legislation calls for new regulation of the derivatives markets. The extent and impact of the regulation are not yet fully known and may not be for some time. New regulation of derivatives may make them more costly, may limit their availability, or may otherwise adversely affect their value or performance. Leveraging risk. The value of your investment may be more volatile if the fund borrows or uses derivatives or other investments that have a leveraging effect on the fund’s portfolio. Other risks also will be compounded. This is because leverage generally magnifies the effect of a change in the value of an asset and creates a risk of loss of value on a larger pool of assets than the fund would otherwise have had, potentially resulting in the loss of all assets. The fund may also have to sell assets at inopportune times to satisfy its obligations. Liquidity risk. Some assets held by the fund may be difficult to sell, or illiquid, particularly during times of market turmoil. Illiquid assets may also be difficult to value. If the fund is forced to sell an illiquid asset to meet redemption requests or other cash needs, the fund may be forced to sell at a loss. Risk of increase in expenses. Your actual costs of investing in the fund may be higher than the expenses shown in “Annual fund operating expenses” for a variety of reasons. For example, expense ratios may be higher than those shown if a fee limitation is changed or terminated or if average net assets decrease. Net assets are more likely to decrease and fund expense ratios are more likely to increase when markets are volatile. Tax risk. The income on the fund’s municipal securities could become subject to regular federal income tax and New York State and New York City personal income taxes due to noncompliant conduct by issuers, unfavorable legislation or litigation or adverse interpretations by regulatory authorities. Prepayment or call risk. Many issuers have a right to prepay their securities. If interest rates fall, an issuer may exercise this right. If this happens, the fund will be forced to reinvest prepayment proceeds at a time when yields on securities available in the market are lower than the yield on the prepaid security. The fund also may lose any premium it paid on the security. Extension risk. If interest rates rise, repayments of fixed income securities may occur more slowly than anticipated by the market. This may drive the prices of these securities down because their interest rates are lower than the current interest rate and they remain outstanding longer. Non-diversification risk. The fund is classified as “non-diversified,” which means it may invest a larger percentage of its assets in a smaller number of issuers than a diversified fund. To the extent the fund invests its assets in a smaller number of issuers, the fund will be more susceptible to negative events affecting those issuers than a diversified fund. Risks relating to investments in municipal securities. Municipal issuers may be adversely affected by rising health care costs, increasing unfunded pension liabilities, and by the phasing out of federal programs providing financial support. Unfavorable conditions and developments relating to projects financed with municipal securities can result in lower revenues to issuers of municipal securities. Issuers often depend on revenues from these projects to make principal and interest payments. The value of municipal securities can also be adversely affected by changes in the financial condition of one or more individual municipal issuers or insurers of municipal issuers, regulatory and political developments, tax law changes or other legislative actions, and by uncertainties and public perceptions concerning these and other factors. Risks associated with focusing on investments in New York municipal securities. The fund focuses its investments on New York municipal securities. The fund may be affected significantly by adverse economic, political or other events affecting New York municipal issuers. Also, the fund may be more volatile than a more geographically diverse fund. Valuation risk. The sales price the fund could receive for any particular portfolio investment may differ from the fund’s valuation of the investment, particularly for securities that trade in thin or volatile markets or that are valued using a fair value methodology. Investors who purchase or redeem fund shares on days when the fund is holding fair-valued securities may receive fewer or more shares or lower or higher redemption proceeds than they would have received if the fund had not fair-valued the security or had used a different valuation methodology. Cash management and defensive investing risk. The value of the investments held by the fund for cash management or defensive investing purposes can fluctuate. Like other fixed income securities, they are subject to risk, including market, interest rate and credit risk. If the fund holds cash uninvested it will be subject to the credit risk of the depository institution holding the cash. If the fund holds cash uninvested, the fund will not earn income on the cash and the fund’s yield will go down. If a significant amount of the fund’s assets are used for cash management or defensive investing purposes, it may not achieve its investment objective. Portfolio selection risk. The value of your investment may decrease if the subadviser’s judgment about the quality, relative yield, value or market trends affecting a particular security, industry, sector or region, or about interest rates, is incorrect. Not a money market fund. The fund is not a money market fund and is not subject to the strict rules that govern the quality, maturity, liquidity and other features of securities that money market funds may purchase. Under normal conditions, the fund’s investment may be more susceptible than a money market fund to interest rate risk, valuation risk, credit risk and other risks relevant to the fund’s investments. The fund does not attempt to maintain a stable net asset value. Therefore, the fund’s net asset value per share will fluctuate. These risks are discussed in more detail later in this Prospectus or in the SAI.
Risk Lose Money [Text]	rr_RiskLoseMoney	You may lose part or all of your investment in the fund or your investment may not perform as well as other similar investments.
Risk Nondiversified Status [Text]	rr_RiskNondiversifiedStatus	Non-diversification risk. The fund is classified as “non-diversified,” which means it may invest a larger percentage of its assets in a smaller number of issuers than a diversified fund. To the extent the fund invests its assets in a smaller number of issuers, the fund will be more susceptible to negative events affecting those issuers than a diversified fund.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	Performance
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The accompanying 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 the average annual total returns of each class of the fund that has been in operation for at least one full calendar year and also compares the fund’s performance with the average annual total returns of an index or other benchmark and an average. Performance for classes other than those shown may vary from the performance shown to the extent the expenses for those classes differ. The fund makes updated performance information available at the fund’s website, http://www.leggmason.com/individualinvestors/products/mutual-funds/annualized_performance (select share class), or by calling the fund at 1-877-721-1926. The fund’s past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. Sales charges are not reflected in the accompanying bar chart, and if those charges were included, returns would be less than those shown.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	The bar chart shows changes in the fund’s performance from year to year for Class A shares. The table shows the average annual total returns of each class of the fund that has been in operation for at least one full calendar year and also compares the fund’s performance with the average annual total returns of an index or other benchmark and an average. Performance for classes other than those shown may vary from the performance shown to the extent the expenses for those classes differ.
Performance Availability Phone [Text]	rr_PerformanceAvailabilityPhone	1-877-721-1926
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	http://www.leggmason.com/individualinvestors/products/mutual-funds/annualized_performance (select share class)
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	The fund’s past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future.
Bar Chart [Heading]	rr_BarChartHeading	Total returns (before taxes) (%)
Bar Chart Does Not Reflect Sales Loads [Text]	rr_BarChartDoesNotReflectSalesLoads	Sales charges are not reflected in the accompanying bar chart, and if those charges were included, returns would be less than those shown.
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Calendar Years ended December 31 Best quarter (09/30/2009): 5.44 Worst quarter (12/31/2010): (4.03)
Performance Table Heading	rr_PerformanceTableHeading	Average annual total returns (for periods ended December 31, 2012) (%)
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	The after-tax returns are shown only for Class A shares, are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table One Class of after Tax Shown [Text]	rr_PerformanceTableOneClassOfAfterTaxShown	After-tax returns for classes other than Class A will vary from returns shown for Class A.
Performance Table Narrative	rr_PerformanceTableNarrativeTextBlock	The after-tax returns are shown only for Class A shares, 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 for classes other than Class A will vary from returns shown for Class A.
Western Asset Intermediate Maturity New York Municipals Fund | Class A
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a % of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	2.25%
Maximum deferred sales charge (load) (as a % of the lower of net asset value at purchase or redemption)	rr_MaximumDeferredSalesChargeOverOther	none	[1]
Small account fee ($)	rr_MaximumAccountFee	15	[2]
Management fees	rr_ManagementFeesOverAssets	0.50%
Distribution and service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.15%
Other expenses	rr_OtherExpensesOverAssets	0.09%
Total annual fund operating expenses	rr_ExpensesOverAssets	0.74%
Fees waived and/or expenses reimbursed	rr_FeeWaiverOrReimbursementOverAssets		[3]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses	rr_NetExpensesOverAssets	0.74%
1 year	rr_ExpenseExampleYear01	299
3 years	rr_ExpenseExampleYear03	456
5 years	rr_ExpenseExampleYear05	627
10 years	rr_ExpenseExampleYear10	1,123
1 year	rr_ExpenseExampleNoRedemptionYear01	299
3 years	rr_ExpenseExampleNoRedemptionYear03	456
5 years	rr_ExpenseExampleNoRedemptionYear05	627
10 years	rr_ExpenseExampleNoRedemptionYear10	1,123
2003	rr_AnnualReturn2003	4.40%
2004	rr_AnnualReturn2004	1.39%
2005	rr_AnnualReturn2005	1.53%
2006	rr_AnnualReturn2006	4.21%
2007	rr_AnnualReturn2007	4.22%
2008	rr_AnnualReturn2008	(2.01%)
2009	rr_AnnualReturn2009	10.49%
2010	rr_AnnualReturn2010	(0.10%)
2011	rr_AnnualReturn2011	10.14%
2012	rr_AnnualReturn2012	5.77%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best quarter
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Sep. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	5.44%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst quarter
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2010
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(4.03%)
1 year	rr_AverageAnnualReturnYear01	3.38%
5 years	rr_AverageAnnualReturnYear05	4.26%
10 years	rr_AverageAnnualReturnYear10	3.69%
Western Asset Intermediate Maturity New York Municipals Fund | Class C
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a % of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) (as a % of the lower of net asset value at purchase or redemption)	rr_MaximumDeferredSalesChargeOverOther	none
Small account fee ($)	rr_MaximumAccountFee	15	[2]
Management fees	rr_ManagementFeesOverAssets	0.50%
Distribution and service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.75%
Other expenses	rr_OtherExpensesOverAssets	0.11%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.36%
Fees waived and/or expenses reimbursed	rr_FeeWaiverOrReimbursementOverAssets	(0.01%)	[3]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses	rr_NetExpensesOverAssets	1.35%
1 year	rr_ExpenseExampleYear01	137
3 years	rr_ExpenseExampleYear03	430
5 years	rr_ExpenseExampleYear05	744
10 years	rr_ExpenseExampleYear10	1,635
1 year	rr_ExpenseExampleNoRedemptionYear01	137
3 years	rr_ExpenseExampleNoRedemptionYear03	430
5 years	rr_ExpenseExampleNoRedemptionYear05	744
10 years	rr_ExpenseExampleNoRedemptionYear10	1,635
1 year	rr_AverageAnnualReturnYear01	5.24%
5 years	rr_AverageAnnualReturnYear05	4.11%
10 years	rr_AverageAnnualReturnYear10	3.29%
Western Asset Intermediate Maturity New York Municipals Fund | Class FI
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a % of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) (as a % of the lower of net asset value at purchase or redemption)	rr_MaximumDeferredSalesChargeOverOther	none
Small account fee ($)	rr_MaximumAccountFee	none	[2]
Management fees	rr_ManagementFeesOverAssets	0.50%
Distribution and service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	0.33%	[4]
Total annual fund operating expenses	rr_ExpensesOverAssets	1.08%
Fees waived and/or expenses reimbursed	rr_FeeWaiverOrReimbursementOverAssets	(0.23%)	[3]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses	rr_NetExpensesOverAssets	0.85%
1 year	rr_ExpenseExampleYear01	87
3 years	rr_ExpenseExampleYear03	321
5 years	rr_ExpenseExampleYear05	574
10 years	rr_ExpenseExampleYear10	1,297
1 year	rr_ExpenseExampleNoRedemptionYear01	87
3 years	rr_ExpenseExampleNoRedemptionYear03	321
5 years	rr_ExpenseExampleNoRedemptionYear05	574
10 years	rr_ExpenseExampleNoRedemptionYear10	1,297
Western Asset Intermediate Maturity New York Municipals Fund | Class I
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a % of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) (as a % of the lower of net asset value at purchase or redemption)	rr_MaximumDeferredSalesChargeOverOther	none
Small account fee ($)	rr_MaximumAccountFee	none	[2]
Management fees	rr_ManagementFeesOverAssets	0.50%
Distribution and service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.13%
Total annual fund operating expenses	rr_ExpensesOverAssets	0.63%
Fees waived and/or expenses reimbursed	rr_FeeWaiverOrReimbursementOverAssets	(0.03%)	[3]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses	rr_NetExpensesOverAssets	0.60%
1 year	rr_ExpenseExampleYear01	61
3 years	rr_ExpenseExampleYear03	198
5 years	rr_ExpenseExampleYear05	347
10 years	rr_ExpenseExampleYear10	783
1 year	rr_ExpenseExampleNoRedemptionYear01	61
3 years	rr_ExpenseExampleNoRedemptionYear03	198
5 years	rr_ExpenseExampleNoRedemptionYear05	347
10 years	rr_ExpenseExampleNoRedemptionYear10	783
1 year	rr_AverageAnnualReturnYear01	5.92%
5 years	rr_AverageAnnualReturnYear05		[5]
10 years	rr_AverageAnnualReturnYear10		[5]
Since inception	rr_AverageAnnualReturnSinceInception	4.89%
Inception date	rr_AverageAnnualReturnInceptionDate	Apr. 01, 2008
Western Asset Intermediate Maturity New York Municipals Fund | Return after taxes on distributions | Class A
Risk/Return:	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	3.38%
5 years	rr_AverageAnnualReturnYear05	4.26%
10 years	rr_AverageAnnualReturnYear10	3.69%
Western Asset Intermediate Maturity New York Municipals Fund | Return after taxes on distributions and sale of fund shares | Class A
Risk/Return:	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	3.34%
5 years	rr_AverageAnnualReturnYear05	4.16%
10 years	rr_AverageAnnualReturnYear10	3.67%
Western Asset Intermediate Maturity New York Municipals Fund | Barclays New York Intermediate Municipal Bond Index (reflects no deduction for fees, expenses or taxes)
Risk/Return:	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	3.76%	[6]
5 years	rr_AverageAnnualReturnYear05	5.98%	[6]
10 years	rr_AverageAnnualReturnYear10	4.97%	[6]
Western Asset Intermediate Maturity New York Municipals Fund | Lipper New York Intermediate Municipals Debt Funds Average (reflects fees and expenses but no deduction for sales charges or taxes)
Risk/Return:	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	4.04%	[7]
5 years	rr_AverageAnnualReturnYear05	4.36%	[7]
10 years	rr_AverageAnnualReturnYear10	3.56%	[7]

[1] Generally,

[2] If your shares are held in a direct account and the value of your account is below $1,000, the fund may charge you a fee of $3.75 per account that is determined and assessed quarterly (with an annual maximum of $15.00 per account). Direct accounts generally include accounts held in the name of the individual investor on the fund’s books and records.

[3] The manager has agreed to waive fees and/or reimburse operating expenses (other than interest, brokerage, taxes, extraordinary expenses and acquired fund fees and expenses) so that total annual operating expenses are not expected to exceed 0.75% for Class A shares, 1.35% for Class C shares, 0.85% for Class FI shares and 0.60% for Class I shares. These arrangements cannot be terminated prior to December 31, 2014 without the Board of Trustees' consent. The manager is permitted to recapture amounts waived and/or reimbursed to a class during the same fiscal year if the class' total annual operating expenses have fallen to a level below the limits described above.

[4] "Other expenses" for Class FI shares are estimated for the current fiscal year. Actual expenses may differ from estimates.

[5] N/A

[6] For Class I shares, for the period from March 31, 2008 to December 31, 2012, the average annual total return of the Barclays New York Intermediate Municipal Bond Index was 6.00%.

[7] For Class I shares, for the period from March 31, 2008 to December 31, 2012, the average annual total return of the Lipper New York Intermediate Municipals Debt Funds Average was 4.54%.

XML

Document and Entity Information	12 Months Ended
	Mar. 31, 2013
Risk/Return:
Document Type	485BPOS
Document Period End Date	Nov. 30, 2012
Registrant Name	LEGG MASON PARTNERS INCOME TRUST
Central Index Key	0000764624
Amendment Flag	false
Document Creation Date	Mar. 26, 2013
Document Effective Date	Mar. 31, 2013
Prospectus Date	Mar. 31, 2013

XML

Western Asset Massachusetts Municipals Fund

Western Asset
Massachusetts
Municipals
Fund

Investment objective

The fund seeks to provide Massachusetts investors with as high a level of current income exempt from federal income tax and Massachusetts personal income taxes as is consistent with the preservation of principal.

Fees and expenses of the fund

The accompanying table describes the fees and expenses that you may pay if you buy and hold shares of the fund.

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in funds sold by Legg Mason Investor Services, LLC (“LMIS”), the fund’s distributor. More information about these and other discounts is available from your financial intermediary, in this Prospectus on page 21 under the heading “Sales charges” and in the fund’s statement of additional information (“SAI”) on page 60 under the heading “Sales Charge Waivers and Reductions.”

Shareholder fees (fees paid directly from your investment)

Shareholder Fees Western Asset Massachusetts Municipals Fund (USD $)		Class A		Class C	Class FI	Class I
Maximum sales charge (load) imposed on purchases (as a % of offering price)		4.25%		none	none	none
Maximum deferred sales charge (load) (as a % of the lower of net asset value at purchase or redemption) (may be reduced over time)		none	[1]	1.00%	none	none
Small account fee ($)	[2]	15		15	none	none

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of
your investment) (%)

Annual Fund Operating Expenses Western Asset Massachusetts Municipals Fund		Class A	Class C	Class FI		Class I
Management fees		0.50%	0.50%	0.50%		0.50%
Distribution and service (12b-1) fees		0.15%	0.70%	0.25%		none
Other expenses		0.15%	0.18%	0.43%	[1]	0.23%
Total annual fund operating expenses		0.80%	1.38%	1.18%		0.73%
Fees waived and/or expenses reimbursed	[2]	(0.05%)	(0.08%)	(0.33%)		(0.13%)
Total annual fund operating expenses after waiving fees and/or reimbursing expenses		0.75%	1.30%	0.85%		0.60%

Example

This 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:

• You invest $10,000 in the fund for the time periods indicated

• Your investment has a 5% return each year and the fund’s operating expenses remain the same

• You reinvest all distributions and dividends without a sales charge

Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Number of years you own your shares ($)

Expense Example Western Asset Massachusetts Municipals Fund (USD $)	1 year	3 years	5 years	10 years
Class A	498	665	846	1,368
Class C	232	429	747	1,650
Class FI	87	342	617	1,403
Class I	61	220	393	894

Number of years you own your shares ($)

Expense Example, No Redemption Western Asset Massachusetts Municipals Fund (USD $)	1 year	3 years	5 years	10 years
Class A	498	665	846	1,368
Class C	132	429	747	1,650
Class FI	87	342	617	1,403
Class I	61	220	393	894

Portfolio turnover.

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 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 14% of the average value of its portfolio.

Principal investment strategies

Under normal circumstances, the fund invests at least 80% of its assets in investment grade "Massachusetts municipal securities" or other investments with similar economic characteristics. Massachusetts municipal securities are securities the interest on which is excluded from regular federal income tax and Massachusetts personal income taxes. The fund's 80% policy may not be changed without a shareholder vote. Interest on Massachusetts municipal securities may be subject to the federal alternative minimum tax.

Massachusetts municipal securities include debt obligations issued by the Commonwealth of Massachusetts and its political subdivisions, agencies and public authorities, certain other governmental issuers (such as Puerto Rico, the U.S. Virgin Islands and Guam) and other qualifying issuers. These securities include participation or other interests in municipal securities issued or backed by banks, insurance companies and other financial institutions.

Some municipal securities, such as general obligation issues, are backed by the issuer's taxing authority, while other municipal securities, such as revenue issues, are backed only by revenues from certain facilities or other sources and not by the issuer itself.

The fund focuses on investment grade bonds (that is, securities rated in the Baa/BBB categories or above or, if unrated, determined to be of comparable credit quality by the subadviser) but may invest up to 20% of its assets in below investment grade bonds (commonly known as "junk bonds").

The fund may invest in securities of any maturity. The fund focuses primarily on intermediate-term and long-term municipal securities, and will normally invest in securities which have remaining maturities at the time of purchase from one to more than thirty years.

Instead of, and/or in addition to, investing directly in particular securities, the fund may use instruments such as derivatives, including futures contracts, and synthetic instruments that are intended to provide economic exposure to the securities or the issuer. The fund may use one or more types of these instruments without limit, except that these instruments are taken into account when determining compliance with the fund's 80% policy. For additional information regarding derivatives, see "More on the fund's investment strategies, investments and risks—Derivatives" in this Prospectus.

The fund may also engage in a variety of transactions using derivatives in order to change the investment characteristics of its portfolio (such as shortening or lengthening duration) and for other purposes.

The fund is classified as "non-diversified," which means it may invest a larger percentage of its assets in a smaller number of issuers than a diversified fund.

Certain risks

Risk is inherent in all investing. There is no assurance that the fund will meet its investment objective. The value of your investment in the fund, as well as the amount of return you receive on your investment, may fluctuate significantly. You may lose part or all of your investment in the fund or your investment may not perform as well as other similar investments. The following is a summary description of certain risks of investing in the fund.

Market and interest rate risk. The market prices of the fund's securities may go up or down, sometimes rapidly or unpredictably, due to general market conditions, such as real or perceived adverse economic or political conditions, inflation, changes in interest rates, lack of liquidity in the bond markets or adverse investor sentiment. When market prices fall, the value of your investment will go down. The value of your investment may also go down when interest rates rise. A rise in rates tends to have a greater impact on the prices of longer term or duration securities. The financial crisis that began in 2008 has caused a significant decline in the value and liquidity of many securities of issuers worldwide. In response to the crisis, the U.S. and other governments and the Federal Reserve and certain foreign central banks have taken steps to support financial markets. The withdrawal of this support, failure of efforts in response to the crisis, or investor perception that these efforts are not succeeding could negatively affect financial markets generally as well as the value and liquidity of certain securities. In addition, policy and legislative changes in the United States and in other countries are changing many aspects of financial regulation. The impact of these changes on the markets, and the practical implications for market participants, may not be fully known for some time.

Credit risk. If an issuer or guarantor of a security held by the fund or a counterparty to a financial contract with the fund defaults or is downgraded, or is perceived to be less creditworthy, or if the value of the assets underlying a security declines, the value of your investment will typically decline. Junk bonds have a higher risk of default and are considered speculative. Subordinated securities are more likely to suffer a credit loss than non-subordinated securities of the same issuer and will be disproportionately affected by a default, downgrade or perceived decline in creditworthiness.

Derivatives risk. Using derivatives can increase fund losses and reduce opportunities for gains when market prices, interest rates or the derivative instruments themselves behave in a way not anticipated by the fund. Using derivatives also can have a leveraging effect and increase fund volatility. Derivatives may be difficult to sell, unwind or value, and the counterparty may default on its obligations to the fund. Recent legislation calls for new regulation of the derivatives markets. The extent and impact of the regulation are not yet fully known and may not be for some time. New regulation of derivatives may make them more costly, may limit their availability, or may otherwise adversely affect their value or performance.

Leveraging risk. The value of your investment may be more volatile if the fund borrows or uses derivatives or other investments that have a leveraging effect on the fund's portfolio. Other risks also will be compounded. This is because leverage generally magnifies the effect of a change in the value of an asset and creates a risk of loss of value on a larger pool of assets than the fund would otherwise have had, potentially resulting in the loss of all assets. The fund may also have to sell assets at inopportune times to satisfy its obligations.

Liquidity risk. Some assets held by the fund may be difficult to sell, or illiquid, particularly during times of market turmoil. Illiquid assets may also be difficult to value. If the fund is forced to sell an illiquid asset to meet redemption requests or other cash needs, the fund may be forced to sell at a loss.

Risk of increase in expenses. Your actual costs of investing in the fund may be higher than the expenses shown in "Annual fund operating expenses" for a variety of reasons. For example, expense ratios may be higher than those shown if a fee limitation is changed or terminated or if average net assets decrease. Net assets are more likely to decrease and fund expense ratios are more likely to increase when markets are volatile.

Tax risk. The income on the fund's municipal securities could become subject to regular federal income tax or Massachusetts personal income taxes due to
noncompliant conduct by issuers, unfavorable legislation or litigation or adverse interpretations by regulatory authorities.

Prepayment or call risk. Many issuers have a right to prepay their securities. If interest rates fall, an issuer may exercise this right. If this happens, the fund will be forced to reinvest prepayment proceeds at a time when yields on securities available in the market are lower than the yield on the prepaid security. The fund also may lose any premium it paid on the security.

Extension risk. If interest rates rise, repayments of fixed income securities may occur more slowly than anticipated by the market. This may drive the prices of these securities down because their interest rates are lower than the current interest rate and they remain outstanding longer.

Non-diversification risk. The fund is classified as "non-diversified," which means it may invest a larger percentage of its assets in a smaller number of issuers than a diversified fund. To the extent the fund invests its assets in a smaller number of issuers, the fund will be more susceptible to negative events affecting those issuers than a diversified fund.

Risks relating to investments in municipal securities. Municipal issuers may be adversely affected by rising health care costs, increasing unfunded pension liabilities, and by the phasing out of federal programs providing financial support. Unfavorable conditions and developments relating to projects financed with municipal securities can result in lower revenues to issuers of municipal securities. Issuers often depend on revenues from these projects to make principal and interest payments. The value of municipal securities can also be adversely affected by changes in the financial condition of one or more individual municipal issuers or insurers of municipal issuers, regulatory and political developments, tax law changes or other legislative actions, and by uncertainties and public perceptions concerning these and other factors.

Risks associated with focusing on investments in Massachusetts municipal securities. The fund focuses its investments on Massachusetts municipal securities. The fund may be affected significantly by adverse economic, political or other events affecting Massachusetts municipal issuers. Also, the fund may be more volatile than a more geographically diverse fund.

Valuation risk. The sales price the fund could receive for any particular portfolio investment may differ from the fund's valuation of the investment, particularly for securities that trade in thin or volatile markets or that are valued using a fair value methodology. Investors who purchase or redeem fund shares on days when the fund is holding fair-valued securities may receive fewer or more shares or lower or higher redemption proceeds than they would have received if the fund had not fair-valued the security or had used a different valuation methodology.

Cash management and defensive investing risk. The value of the investments held by the fund for cash management or defensive investing purposes can fluctuate. Like other fixed income securities, they are subject to risk, including market, interest rate and credit risk. If the fund holds cash uninvested it will be subject to the credit risk of the depository institution holding the cash. If the fund holds cash uninvested, the fund will not earn income on the cash and the fund's yield will go down. If a significant amount of the fund's assets are used for cash management or defensive investing purposes, it may not achieve its investment objective.

Portfolio selection risk. The value of your investment may decrease if the subadviser's judgment about the quality, relative yield, value or market trends affecting a particular security, industry, sector or region, or about interest rates, is incorrect.

These risks are discussed in more detail later in this Prospectus or in the SAI.

Performance

The accompanying 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 the average annual total returns of each class of the fund that has been in operation for at least one full calendar year and also compares the fund’s performance with the average annual total returns of an index or other benchmark and an average. Performance for classes other than those shown may vary from the performance shown to the extent the expenses for those classes differ. The fund makes updated performance information available at the fund’s website, http://www.leggmason.com/individualinvestors/products/mutual-funds/annualized_performance (select share class), or by calling the fund at 1-877-721-1926.

The fund’s past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future.

Sales charges are not reflected in the accompanying bar chart, and if those charges were included, returns would be less than those shown.

Total returns (before taxes) (%)

Calendar Years ended December 31

Best quarter
(09/30/2009): 7.16

Worst quarter
(12/31/2008): (6.07)

Average annual total returns (for periods ended December 31, 2012) (%)

Average Annual Total Returns Western Asset Massachusetts Municipals Fund		1 year	5 years		10 years		Since inception	Inception date
Class A		3.06%	4.48%		4.21%
Class A Return after taxes on distributions		3.06%	4.48%		4.21%
Class A Return after taxes on distributions and sale of fund shares		3.29%	4.41%		4.20%
Class C		6.02%	4.80%		4.05%
Class I		7.84%		[1]		[1]	5.54%	Jun. 03, 2008
Barclays Massachusetts Municipal Bond Index (reflects no deduction for fees, expenses or taxes)	[2]	6.03%	5.95%		5.11%
Lipper Massachusetts Municipal Debt Funds Average (reflects no deduction for fees, expenses or taxes)	[3]	7.69%	5.06%		4.42%

The after-tax returns are shown only for Class A shares 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 for classes other than Class A will vary from returns shown for Class A.

[1] Generally,

[2] If your shares are held in a direct account and the value of your account is below $1,000, the fund may charge you a fee of $3.75 per account that is determined and assessed quarterly (with an annual maximum of $15.00 per account). Direct accounts generally include accounts held in the name of the individual investor on the fund's books and records.

[1] "Other expenses" for Class FI shares are estimated for the current fiscal year. Actual expenses may differ from estimates.

[2] The manager has agreed to waive fees and/or reimburse operating expenses (other than interest, brokerage, taxes, extraordinary expenses and acquired fund fees and expenses) so that total annual operating expenses are not expected to exceed 0.75% for Class A shares, 1.30% for Class C shares, 0.85% for Class FI shares and 0.60% for Class I shares. These arrangements cannot be terminated prior to December 31, 2014 without the Board of Trustees' consent. The manager is permitted to recapture amounts waived and/or reimbursed to a class during the same fiscal year if the class' total annual operating expenses have fallen to a level below the limits described above.

[1] N/A

[2] For Class I shares, for the period from June 3, 2008 to December 31, 2012, the average annual total return of the Barclays Massachusetts Municipal Bond Index was 6.09%.

[3] For Class I shares, for the period from June 30, 2008 to December 31, 2012, the average annual total return of the Lipper Massachusetts Municipal Debt Funds Average was 5.86%.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	LEGG MASON PARTNERS INCOME TRUST
Prospectus Date	rr_ProspectusDate	Mar. 31, 2013
Document Creation Date	dei_DocumentCreationDate	Mar. 26, 2013

XML

Western Asset Intermediate Maturity New York Municipals Fund

Western Asset
Intermediate Maturity
New York Municipals
Fund

Investment objective

The fund seeks to provide New York investors with as high a level of current income exempt from federal income tax and New York State and New York City personal income taxes as is consistent with the preservation of principal.

Fees and expenses of the fund

The accompanying table describes the fees and expenses that you may pay if you buy and hold shares of the fund.

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in funds sold by Legg Mason Investor Services, LLC (“LMIS”), the fund’s distributor. More information about these and other discounts is available from your financial intermediary, in this Prospectus on page 22 under the heading “Sales charges” and in the fund’s statement of additional information (“SAI”) on page 63 under the heading “Sales Charge Waivers and Reductions.”

Shareholder fees (fees paid directly from your investment)

Shareholder Fees Western Asset Intermediate Maturity New York Municipals Fund (USD $)		Class A		Class C	Class FI	Class I
Maximum sales charge (load) imposed on purchases (as a % of offering price)		2.25%		none	none	none
Maximum deferred sales charge (load) (as a % of the lower of net asset value at purchase or redemption)		none	[1]	none	none	none
Small account fee ($)	[2]	15		15	none	none

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of
your investment) (%)

Annual Fund Operating Expenses Western Asset Intermediate Maturity New York Municipals Fund		Class A	Class C	Class FI		Class I
Management fees		0.50%	0.50%	0.50%		0.50%
Distribution and service (12b-1) fees		0.15%	0.75%	0.25%		none
Other expenses		0.09%	0.11%	0.33%	[1]	0.13%
Total annual fund operating expenses		0.74%	1.36%	1.08%		0.63%
Fees waived and/or expenses reimbursed	[2]		(0.01%)	(0.23%)		(0.03%)
Total annual fund operating expenses after waiving fees and/or reimbursing expenses		0.74%	1.35%	0.85%		0.60%

Example

This 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:

• You invest $10,000 in the fund for the time periods indicated

• Your investment has a 5% return each year and the fund’s operating expenses remain the same

• You reinvest all distributions and dividends without a sales charge

Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Number of years you own your shares ($)

Expense Example Western Asset Intermediate Maturity New York Municipals Fund (USD $)	1 year	3 years	5 years	10 years
Class A	299	456	627	1,123
Class C	137	430	744	1,635
Class FI	87	321	574	1,297
Class I	61	198	347	783

Number of years you own your shares ($)

Expense Example, No Redemption Western Asset Intermediate Maturity New York Municipals Fund (USD $)	1 year	3 years	5 years	10 years
Class A	299	456	627	1,123
Class C	137	430	744	1,635
Class FI	87	321	574	1,297
Class I	61	198	347	783

Portfolio turnover.

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 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 8% of the average value of its portfolio.

Principal investment strategies

Under normal circumstances, the fund invests at least 80% of its assets in investment grade "New York municipal securities" or other investments with similar economic characteristics. New York municipal securities are securities the interest on which is excluded from regular federal income tax and New York State and New York City personal income taxes. The fund's 80% policy may not be changed without a shareholder vote. Interest on New York municipal securities may be subject to the federal alternative minimum tax.

New York municipal securities include debt obligations issued by the State of New York and its political subdivisions, agencies and public authorities, certain other governmental issuers (such as Puerto Rico, the U.S. Virgin Islands and Guam) and other qualifying issuers. These securities include participation or other interests in municipal securities issued or backed by banks, insurance companies and other financial institutions.

Some municipal securities, such as general obligation issues, are backed by the issuer's taxing authority, while other municipal securities, such as revenue issues, are backed only by revenues from certain facilities or other sources and not by the issuer itself.

The fund focuses on investment grade bonds (that is, securities rated in the Baa/BBB categories or above or, if unrated, determined to be of comparable credit quality by the subadviser) but may invest up to 20% of its assets in below investment grade bonds (commonly known as "junk bonds").

The fund may invest up to 20% of its assets in unrated securities that the subadviser determines to be equivalent to investment grade.

The fund may invest in securities of any maturity. The fund normally maintains an average effective portfolio maturity of between three and ten years. The average effective portfolio maturity of the fund is a weighted average of all the maturities of the securities in the portfolio, computed by weighting each security's effective maturity, as estimated by the fund's subadviser, by the market value of the security. For the purposes of determining the fund's average effective maturity, a security's maturity date will generally be deemed to be the next interest rate reset date for an adjustable rate security or, if earlier, the date of the next demand feature such as a put feature, when the fund would be entitled to receive payment of principal and interest. The subadviser may also take into account estimated future prepayments on securities, such as mortgage-backed securities, with uncertain future cash flows and estimations of call features and similar features and options. These estimates may prove to be incorrect.

Instead of, and/or in addition to, investing directly in particular securities, the fund may use instruments such as derivatives, including futures contracts, and synthetic instruments that are intended to provide economic exposure to the securities or the issuer. The fund may use one or more types of these instruments without limit, except that these instruments are taken into account when determining compliance with the fund's 80% policy. For additional information regarding derivatives, see "More on the fund's investment strategies, investments and risks—Derivatives" in this Prospectus.

The fund may also engage in a variety of transactions using derivatives in order to change the investment characteristics of its portfolio (such as shortening or lengthening duration) and for other purposes.

The fund is classified as "non-diversified," which means it may invest a larger percentage of its assets in a smaller number of issuers than a diversified fund.

Certain risks

Risk is inherent in all investing. There is no assurance that the fund will meet its investment objective. The value of your investment in the fund, as well as the amount of return you receive on your investment, may fluctuate significantly. You may lose part or all of your investment in the fund or your investment may not perform as well as other similar investments. The following is a summary description of certain risks of investing in the fund.

Market and interest rate risk. The market prices of the fund’s securities may go up or down, sometimes rapidly or unpredictably, due to general market conditions, such as real or perceived adverse economic or political conditions, inflation, changes in interest rates, lack of liquidity in the bond markets or adverse investor sentiment. When market prices fall, the value of your investment will go down. The value of your investment may also go down when interest rates rise. A rise in rates tends to have a greater impact on the prices of longer term or duration securities. The financial crisis that began in 2008 has caused a significant decline in the value and liquidity of many securities of issuers worldwide. In response to the crisis, the U.S. and other governments and the Federal Reserve and certain foreign central banks have taken steps to support financial markets. The withdrawal of this support, failure of efforts in response to the crisis, or investor perception that these efforts are not succeeding could negatively affect financial markets generally as well as the value and liquidity of certain securities. In addition, policy and legislative changes in the United States and in other countries are changing many aspects of financial regulation. The impact of these changes on the markets, and the practical implications for market participants, may not be fully known for some time.

Credit risk. If an issuer or guarantor of a security held by the fund or a counterparty to a financial contract with the fund defaults or is downgraded, or is perceived to be less creditworthy, or if the value of the assets underlying a security declines, the value of your investment will typically decline. Junk bonds have a higher risk of default and are considered speculative. Subordinated securities are more likely to suffer a credit loss than non-subordinated securities of the same issuer and will be disproportionately affected by a default, downgrade or perceived decline in creditworthiness.

Derivatives risk. Using derivatives can increase fund losses and reduce opportunities for gains when market prices, interest rates or the derivative instruments themselves behave in a way not anticipated by the fund. Using derivatives also can have a leveraging effect and increase fund volatility. Derivatives may be difficult to sell, unwind or value, and the counterparty may default on its obligations to the fund. Recent legislation calls for new regulation of the derivatives markets. The extent and impact of the regulation are not yet fully known and may not be for some time. New regulation of derivatives may make them more costly, may limit their availability, or may otherwise adversely affect their value or performance.

Leveraging risk. The value of your investment may be more volatile if the fund borrows or uses derivatives or other investments that have a leveraging effect on the fund’s portfolio. Other risks also will be compounded. This is because leverage generally magnifies the effect of a change in the value of an asset and creates a risk of loss of value on a larger pool of assets than the fund would otherwise have had, potentially resulting in the loss of all assets. The fund may also have to sell assets at inopportune times to satisfy its obligations.

Liquidity risk. Some assets held by the fund may be difficult to sell, or illiquid, particularly during times of market turmoil. Illiquid assets may also be difficult to value. If the fund is forced to sell an illiquid asset to meet redemption requests or other cash needs, the fund may be forced to sell at a loss.

Risk of increase in expenses. Your actual costs of investing in the fund may be higher than the expenses shown in “Annual fund operating expenses” for a variety of reasons. For example, expense ratios may be higher than those shown if a fee limitation is changed or terminated or if average net assets decrease. Net assets are more likely to decrease and fund expense ratios are more likely to increase when markets are volatile.

Tax risk. The income on the fund’s municipal securities could become subject to regular federal income tax and New York State and New York City personal income taxes due to noncompliant conduct by issuers, unfavorable legislation or litigation or adverse interpretations by regulatory authorities.

Prepayment or call risk. Many issuers have a right to prepay their securities. If interest rates fall, an issuer may exercise this right. If this happens, the fund will be forced to reinvest prepayment proceeds at a time when yields on securities available in the market are lower than the yield on the prepaid security. The fund also may lose any premium it paid on the security.

Extension risk. If interest rates rise, repayments of fixed income securities may occur more slowly than anticipated by the market. This may drive the prices of these securities down because their interest rates are lower than the current interest rate and they remain outstanding longer.

Non-diversification risk. The fund is classified as “non-diversified,” which means it may invest a larger percentage of its assets in a smaller number of issuers than a diversified fund. To the extent the fund invests its assets in a smaller number of issuers, the fund will be more susceptible to negative events affecting those issuers than a diversified fund.

Risks relating to investments in municipal securities. Municipal issuers may be adversely affected by rising health care costs, increasing unfunded pension liabilities, and by the phasing out of federal programs providing financial support. Unfavorable conditions and developments relating to projects financed with municipal securities can result in lower revenues to issuers of municipal securities. Issuers often depend on revenues from these projects to make principal and interest payments. The value of municipal securities can also be adversely affected by changes in the financial condition of one or more individual municipal issuers or insurers of municipal issuers, regulatory and political developments, tax law changes or other legislative actions, and by uncertainties and public perceptions concerning these and other factors.

Risks associated with focusing on investments in New York municipal securities. The fund focuses its investments on New York municipal securities. The fund may be affected significantly by adverse economic, political or other events affecting New York municipal issuers. Also, the fund may be more volatile than a more geographically diverse fund.

Valuation risk. The sales price the fund could receive for any particular portfolio investment may differ from the fund’s valuation of the investment, particularly for securities that trade in thin or volatile markets or that are valued using a fair value methodology. Investors who purchase or redeem fund shares on days when the fund is holding fair-valued securities may receive fewer or more shares or lower or higher redemption proceeds than they would have received if the fund had not fair-valued the security or had used a different valuation methodology.

Cash management and defensive investing risk. The value of the investments held by the fund for cash management or defensive investing purposes can fluctuate. Like other fixed income securities, they are subject to risk, including market, interest rate and credit risk. If the fund holds cash uninvested it will be subject to the credit risk of the depository institution holding the cash. If the fund holds cash uninvested, the fund will not earn income on the cash and the fund’s yield will go down. If a significant amount of the fund’s assets are used for cash management or defensive investing purposes, it may not achieve its investment objective.

Portfolio selection risk. The value of your investment may decrease if the subadviser’s judgment about the quality, relative yield, value or market trends affecting a particular security, industry, sector or region, or about interest rates, is incorrect.

Not a money market fund. The fund is not a money market fund and is not subject to the strict rules that govern the quality, maturity, liquidity and other features of securities that money market funds may purchase. Under normal conditions, the fund’s investment may be more susceptible than a money market fund to interest rate risk, valuation risk, credit risk and other risks relevant to the fund’s investments. The fund does not attempt to maintain a stable net asset value. Therefore, the fund’s net asset value per share will fluctuate.

These risks are discussed in more detail later in this Prospectus or in the SAI.

Performance

The accompanying 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 the average annual total returns of each class of the fund that has been in operation for at least one full calendar year and also compares the fund’s performance with the average annual total returns of an index or other benchmark and an average. Performance for classes other than those shown may vary from the performance shown to the extent the expenses for those classes differ. The fund makes updated performance information available at the fund’s website, http://www.leggmason.com/individualinvestors/products/mutual-funds/annualized_performance (select share class), or by calling the fund at 1-877-721-1926.

The fund’s past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future.

Sales charges are not reflected in the accompanying bar chart, and if those charges were included, returns would be less than those shown.

Total returns (before taxes) (%)

Calendar Years ended December 31

Best quarter
(09/30/2009): 5.44

Worst quarter
(12/31/2010): (4.03)

Average annual total returns (for periods ended December 31, 2012) (%)

Average Annual Total Returns Western Asset Intermediate Maturity New York Municipals Fund		1 year	5 years		10 years		Since inception	Inception date
Class A		3.38%	4.26%		3.69%
Class A Return after taxes on distributions		3.38%	4.26%		3.69%
Class A Return after taxes on distributions and sale of fund shares		3.34%	4.16%		3.67%
Class C		5.24%	4.11%		3.29%
Class I		5.92%		[1]		[1]	4.89%	Apr. 01, 2008
Barclays New York Intermediate Municipal Bond Index (reflects no deduction for fees, expenses or taxes)	[2]	3.76%	5.98%		4.97%
Lipper New York Intermediate Municipals Debt Funds Average (reflects fees and expenses but no deduction for sales charges or taxes)	[3]	4.04%	4.36%		3.56%

The after-tax returns are shown only for Class A shares, 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 for classes other than Class A will vary from returns shown for Class A.

[1] Generally,

[2] If your shares are held in a direct account and the value of your account is below $1,000, the fund may charge you a fee of $3.75 per account that is determined and assessed quarterly (with an annual maximum of $15.00 per account). Direct accounts generally include accounts held in the name of the individual investor on the fund’s books and records.

[1] "Other expenses" for Class FI shares are estimated for the current fiscal year. Actual expenses may differ from estimates.

[2] The manager has agreed to waive fees and/or reimburse operating expenses (other than interest, brokerage, taxes, extraordinary expenses and acquired fund fees and expenses) so that total annual operating expenses are not expected to exceed 0.75% for Class A shares, 1.35% for Class C shares, 0.85% for Class FI shares and 0.60% for Class I shares. These arrangements cannot be terminated prior to December 31, 2014 without the Board of Trustees' consent. The manager is permitted to recapture amounts waived and/or reimbursed to a class during the same fiscal year if the class' total annual operating expenses have fallen to a level below the limits described above.

[1] N/A

[2] For Class I shares, for the period from March 31, 2008 to December 31, 2012, the average annual total return of the Barclays New York Intermediate Municipal Bond Index was 6.00%.

[3] For Class I shares, for the period from March 31, 2008 to December 31, 2012, the average annual total return of the Lipper New York Intermediate Municipals Debt Funds Average was 4.54%.