497

Morgan, Lewis & Bockius LLP

One Federal Street

Boston, Massachusetts 02110

July 31, 2018

VIA EDGAR

Securities and Exchange Commission

Division of Investment Management

100 F Street, NE

Washington, DC 20549

Re: Legg Mason Partners Income Trust (Securities Act File No. 2-96408; Investment Company Act

File No. 811-04254), the “Registrant”),

with respect to Western Asset Adjustable Rate Income Fund (the “Fund”)

Ladies and Gentlemen:

On behalf of the Registrant and pursuant to Rule 497(e) under the Securities Act of 1933, as amended, attached for filing are exhibits containing in interactive data format the risk/return summary information that appears in a supplement dated July 20, 2018 to the summary prospectus and prospectus of the Fund.

Please call the undersigned at (617) 951-8267 with any comments or questions relating to the filing.

Sincerely,

/s/ Barry N. Hurwitz

Barry N. Hurwitz

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Document Type	dei_DocumentType	497
Document Period End Date	dei_DocumentPeriodEndDate	May 31, 2017
Registrant Name	dei_EntityRegistrantName	LEGG MASON PARTNERS INCOME TRUST
Central Index Key	dei_EntityCentralIndexKey	0000764624
Amendment Flag	dei_AmendmentFlag	false
Document Creation Date	dei_DocumentCreationDate	Jul. 20, 2018
Document Effective Date	dei_DocumentEffectiveDate	Jul. 20, 2018
Prospectus Date	rr_ProspectusDate	Sep. 30, 2017

XML

Sep. 30, 2017

LEGG MASON PARTNERS INCOME TRUST

SUPPLEMENT DATED JULY 20, 2018

TO THE SUMMARY PROSPECTUS AND PROSPECTUS

EACH DATED SEPTEMBER 30, 2017, OF

WESTERN ASSET ADJUSTABLE RATE INCOME FUND (THE “FUND”)

Effective July 20, 2018, the manager has agreed to further reduce or limit certain of the fund’s expenses. Therefore, the following replaces the fee table and footnotes and expense example in the section of the fund’s Summary Prospectus and Prospectus entitled “Fees and expenses of the fund”:

Shareholder fees
(fees paid directly from your investment)
	Class A	Class C	Class C1	Class FI	Class R	Class I	Class IS
Maximum sales charge (load) imposed on purchases (as a % of offering price)	2.251,2,3	None	None	None	None	None	None
Maximum deferred sales charge (load) (as a % of the lower of net asset value at purchase or redemption)4	None	1.00	None	None	None	None	None
Small account fee5	$15	$15	$15	None	None	None	None
Annual fund operating expenses (%)
(expenses that you pay each year as a percentage of the value of your investment)
	Class A	Class C	Class C1	Class FI	Class R	Class I	Class IS
Management fees	0.45	0.45	0.45	0.45	0.45	0.45	0.45
Distribution and/or service (12b-1) fees	0.25	1.00	0.75	0.25	0.50	None	None
Other expenses	0.14	0.22	0.22	0.336	0.336	0.20	0.14
Total annual fund operating expenses	0.84	1.67	1.42	1.03	1.28	0.65	0.59
Fees waived and/or expenses reimbursed7	—	(0.04)	(0.04)	(0.15)	(0.15)	(0.12)	(0.16)
Total annual fund operating expenses after waiving fees and/or reimbursing expenses	0.84	1.63	1.38	0.88	1.13	0.53	0.43

¹  The sales charge is waived for shareholders purchasing Class A shares through accounts where LMIS is the broker-dealer of record (“LMIS Accounts”).

² Shareholders purchasing Class A shares through certain Service Agents or in certain types of accounts may be eligible for a waiver of the sales charge. For additional information, see “Sales charges” in the Prospectus.

³  You may buy Class A shares in amounts of $500,000 or more at net asset value without an initial sales charge.

⁴  Maximum deferred sales charge (load) may be reduced over time.

⁵  If your shares are held in a direct account and the value of your account is below $1,000 ($250 for retirement plans that are not employer- sponsored), 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.

⁶  “Other expenses” for Class FI and R shares are estimated for the current fiscal year. Actual expenses may differ from estimates.

⁷  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 effective July 20, 2018 the ratio of total annual fund operating expenses will not exceed 0.88% for Class A shares, 1.63% for Class C shares, 1.38% for Class C1 shares, 0.88% for Class FI shares, 1.13% for Class R shares, 0.53% for Class I shares and 0.43% for Class IS shares, subject to recapture as described below. In addition, the ratio of total annual fund operating expenses for Class IS shares will not exceed the ratio of total annual fund operating expenses for Class I shares, subject to recapture as described below. These arrangements cannot be terminated prior to December 31, 2019 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 in which the manager earned the fee or incurred the expense if the class’ total annual fund operating expenses have fallen to a level below the limits described above. In no case will the manager recapture any amount that would result, on any particular business day of the fund, in the class’ total annual fund operating expenses exceeding the applicable limits described above or any other lower limit then in effect.

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 ($)
	1 year	3 years	5 years	10 years
Class A (with or without redemption at end of period)	309	487	681	1,239
Class C (with redemption at end of period)	266	523	904	1,974
Class C (without redemption at end of period)	166	523	904	1,974
Class C1 (with or without redemption at end of period)	140	445	772	1,698
Class FI (with or without redemption at end of period)	90	313	554	1,246
Class R (with or without redemption at end of period)	115	390	687	1,532
Class I (with or without redemption at end of period)	54	195	350	799
Class IS (with or without redemption at end of period)	44	173	314	723

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

LEGG MASON PARTNERS INCOME TRUST

Prospectus Date

rr_ProspectusDate

Sep. 30, 2017

Supplement [Text Block]

lmpit_SupplementTextBlock

LEGG MASON PARTNERS INCOME TRUST

SUPPLEMENT DATED JULY 20, 2018

TO THE SUMMARY PROSPECTUS AND PROSPECTUS

EACH DATED SEPTEMBER 30, 2017, OF

WESTERN ASSET ADJUSTABLE RATE INCOME FUND (THE “FUND”)

Effective July 20, 2018, the manager has agreed to further reduce or limit certain of the fund’s expenses. Therefore, the following replaces the fee table and footnotes and expense example in the section of the fund’s Summary Prospectus and Prospectus entitled “Fees and expenses of the fund”:

Shareholder fees
(fees paid directly from your investment)
	Class A	Class C	Class C1	Class FI	Class R	Class I	Class IS
Maximum sales charge (load) imposed on purchases (as a % of offering price)	2.251,2,3	None	None	None	None	None	None
Maximum deferred sales charge (load) (as a % of the lower of net asset value at purchase or redemption)4	None	1.00	None	None	None	None	None
Small account fee5	$15	$15	$15	None	None	None	None
Annual fund operating expenses (%)
(expenses that you pay each year as a percentage of the value of your investment)
	Class A	Class C	Class C1	Class FI	Class R	Class I	Class IS
Management fees	0.45	0.45	0.45	0.45	0.45	0.45	0.45
Distribution and/or service (12b-1) fees	0.25	1.00	0.75	0.25	0.50	None	None
Other expenses	0.14	0.22	0.22	0.336	0.336	0.20	0.14
Total annual fund operating expenses	0.84	1.67	1.42	1.03	1.28	0.65	0.59
Fees waived and/or expenses reimbursed7	—	(0.04)	(0.04)	(0.15)	(0.15)	(0.12)	(0.16)
Total annual fund operating expenses after waiving fees and/or reimbursing expenses	0.84	1.63	1.38	0.88	1.13	0.53	0.43

¹  The sales charge is waived for shareholders purchasing Class A shares through accounts where LMIS is the broker-dealer of record (“LMIS Accounts”).

² Shareholders purchasing Class A shares through certain Service Agents or in certain types of accounts may be eligible for a waiver of the sales charge. For additional information, see “Sales charges” in the Prospectus.

³  You may buy Class A shares in amounts of $500,000 or more at net asset value without an initial sales charge.

⁴  Maximum deferred sales charge (load) may be reduced over time.

⁵  If your shares are held in a direct account and the value of your account is below $1,000 ($250 for retirement plans that are not employer- sponsored), 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.

⁶  “Other expenses” for Class FI and R shares are estimated for the current fiscal year. Actual expenses may differ from estimates.

⁷  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 effective July 20, 2018 the ratio of total annual fund operating expenses will not exceed 0.88% for Class A shares, 1.63% for Class C shares, 1.38% for Class C1 shares, 0.88% for Class FI shares, 1.13% for Class R shares, 0.53% for Class I shares and 0.43% for Class IS shares, subject to recapture as described below. In addition, the ratio of total annual fund operating expenses for Class IS shares will not exceed the ratio of total annual fund operating expenses for Class I shares, subject to recapture as described below. These arrangements cannot be terminated prior to December 31, 2019 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 in which the manager earned the fee or incurred the expense if the class’ total annual fund operating expenses have fallen to a level below the limits described above. In no case will the manager recapture any amount that would result, on any particular business day of the fund, in the class’ total annual fund operating expenses exceeding the applicable limits described above or any other lower limit then in effect.

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 ($)
	1 year	3 years	5 years	10 years
Class A (with or without redemption at end of period)	309	487	681	1,239
Class C (with redemption at end of period)	266	523	904	1,974
Class C (without redemption at end of period)	166	523	904	1,974
Class C1 (with or without redemption at end of period)	140	445	772	1,698
Class FI (with or without redemption at end of period)	90	313	554	1,246
Class R (with or without redemption at end of period)	115	390	687	1,532
Class I (with or without redemption at end of period)	54	195	350	799
Class IS (with or without redemption at end of period)	44	173	314	723

Western Asset Adjustable Rate Income Fund

Risk/Return:

rr_RiskReturnAbstract

Supplement [Text Block]

lmpit_SupplementTextBlock

LEGG MASON PARTNERS INCOME TRUST

SUPPLEMENT DATED JULY 20, 2018

TO THE SUMMARY PROSPECTUS AND PROSPECTUS

EACH DATED SEPTEMBER 30, 2017, OF

WESTERN ASSET ADJUSTABLE RATE INCOME FUND (THE “FUND”)

Effective July 20, 2018, the manager has agreed to further reduce or limit certain of the fund’s expenses. Therefore, the following replaces the fee table and footnotes and expense example in the section of the fund’s Summary Prospectus and Prospectus entitled “Fees and expenses of the fund”:

Shareholder fees
(fees paid directly from your investment)
	Class A	Class C	Class C1	Class FI	Class R	Class I	Class IS
Maximum sales charge (load) imposed on purchases (as a % of offering price)	2.251,2,3	None	None	None	None	None	None
Maximum deferred sales charge (load) (as a % of the lower of net asset value at purchase or redemption)4	None	1.00	None	None	None	None	None
Small account fee5	$15	$15	$15	None	None	None	None
Annual fund operating expenses (%)
(expenses that you pay each year as a percentage of the value of your investment)
	Class A	Class C	Class C1	Class FI	Class R	Class I	Class IS
Management fees	0.45	0.45	0.45	0.45	0.45	0.45	0.45
Distribution and/or service (12b-1) fees	0.25	1.00	0.75	0.25	0.50	None	None
Other expenses	0.14	0.22	0.22	0.336	0.336	0.20	0.14
Total annual fund operating expenses	0.84	1.67	1.42	1.03	1.28	0.65	0.59
Fees waived and/or expenses reimbursed7	—	(0.04)	(0.04)	(0.15)	(0.15)	(0.12)	(0.16)
Total annual fund operating expenses after waiving fees and/or reimbursing expenses	0.84	1.63	1.38	0.88	1.13	0.53	0.43

¹  The sales charge is waived for shareholders purchasing Class A shares through accounts where LMIS is the broker-dealer of record (“LMIS Accounts”).

² Shareholders purchasing Class A shares through certain Service Agents or in certain types of accounts may be eligible for a waiver of the sales charge. For additional information, see “Sales charges” in the Prospectus.

³  You may buy Class A shares in amounts of $500,000 or more at net asset value without an initial sales charge.

⁴  Maximum deferred sales charge (load) may be reduced over time.

⁵  If your shares are held in a direct account and the value of your account is below $1,000 ($250 for retirement plans that are not employer- sponsored), 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.

⁶  “Other expenses” for Class FI and R shares are estimated for the current fiscal year. Actual expenses may differ from estimates.

⁷  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 effective July 20, 2018 the ratio of total annual fund operating expenses will not exceed 0.88% for Class A shares, 1.63% for Class C shares, 1.38% for Class C1 shares, 0.88% for Class FI shares, 1.13% for Class R shares, 0.53% for Class I shares and 0.43% for Class IS shares, subject to recapture as described below. In addition, the ratio of total annual fund operating expenses for Class IS shares will not exceed the ratio of total annual fund operating expenses for Class I shares, subject to recapture as described below. These arrangements cannot be terminated prior to December 31, 2019 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 in which the manager earned the fee or incurred the expense if the class’ total annual fund operating expenses have fallen to a level below the limits described above. In no case will the manager recapture any amount that would result, on any particular business day of the fund, in the class’ total annual fund operating expenses exceeding the applicable limits described above or any other lower limit then in effect.

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 ($)
	1 year	3 years	5 years	10 years
Class A (with or without redemption at end of period)	309	487	681	1,239
Class C (with redemption at end of period)	266	523	904	1,974
Class C (without redemption at end of period)	166	523	904	1,974
Class C1 (with or without redemption at end of period)	140	445	772	1,698
Class FI (with or without redemption at end of period)	90	313	554	1,246
Class R (with or without redemption at end of period)	115	390	687	1,532
Class I (with or without redemption at end of period)	54	195	350	799
Class IS (with or without redemption at end of period)	44	173	314	723

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, 2019

Other Expenses, New Fund, Based on Estimates [Text]

rr_OtherExpensesNewFundBasedOnEstimates

“Other expenses” for Class FI and R 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 ($)

Western Asset Adjustable Rate Income Fund | Class A

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) imposed on purchases (as a % of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

2.25%

^[1],[2],[3]

Maximum deferred sales charge (load) (as a % of the lower of net asset value at purchase or redemption)

rr_MaximumDeferredSalesChargeOverOther

none

^[4]

Small account fee ($)

rr_MaximumAccountFee

$ 15

^[5]

Management fees

rr_ManagementFeesOverAssets

0.45%

Distribution and/or service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other expenses

rr_OtherExpensesOverAssets

0.14%

Total annual fund operating expenses

rr_ExpensesOverAssets

0.84%

Fees waived and/or expenses reimbursed

rr_FeeWaiverOrReimbursementOverAssets

^[6]

Total annual fund operating expenses after waiving fees and/or reimbursing expenses

rr_NetExpensesOverAssets

0.84%

1 year

rr_ExpenseExampleYear01

$ 309

3 years

rr_ExpenseExampleYear03

487

5 years

rr_ExpenseExampleYear05

681

10 years

rr_ExpenseExampleYear10

1,239

1 year

rr_ExpenseExampleNoRedemptionYear01

309

3 years

rr_ExpenseExampleNoRedemptionYear03

487

5 years

rr_ExpenseExampleNoRedemptionYear05

681

10 years

rr_ExpenseExampleNoRedemptionYear10

$ 1,239

Western Asset Adjustable Rate Income 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

1.00%

^[4]

Small account fee ($)

rr_MaximumAccountFee

$ 15

^[5]

Management fees

rr_ManagementFeesOverAssets

0.45%

Distribution and/or service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other expenses

rr_OtherExpensesOverAssets

0.22%

Total annual fund operating expenses

rr_ExpensesOverAssets

1.67%

Fees waived and/or expenses reimbursed

rr_FeeWaiverOrReimbursementOverAssets

(0.04%)

^[6]

Total annual fund operating expenses after waiving fees and/or reimbursing expenses

rr_NetExpensesOverAssets

1.63%

1 year

rr_ExpenseExampleYear01

$ 266

3 years

rr_ExpenseExampleYear03

523

5 years

rr_ExpenseExampleYear05

904

10 years

rr_ExpenseExampleYear10

1,974

1 year

rr_ExpenseExampleNoRedemptionYear01

166

3 years

rr_ExpenseExampleNoRedemptionYear03

523

5 years

rr_ExpenseExampleNoRedemptionYear05

904

10 years

rr_ExpenseExampleNoRedemptionYear10

$ 1,974

Western Asset Adjustable Rate Income Fund | Class C1

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

^[4]

Small account fee ($)

rr_MaximumAccountFee

$ 15

^[5]

Management fees

rr_ManagementFeesOverAssets

0.45%

Distribution and/or service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

0.75%

Other expenses

rr_OtherExpensesOverAssets

0.22%

Total annual fund operating expenses

rr_ExpensesOverAssets

1.42%

Fees waived and/or expenses reimbursed

rr_FeeWaiverOrReimbursementOverAssets

(0.04%)

^[6]

Total annual fund operating expenses after waiving fees and/or reimbursing expenses

rr_NetExpensesOverAssets

1.38%

1 year

rr_ExpenseExampleYear01

$ 140

3 years

rr_ExpenseExampleYear03

445

5 years

rr_ExpenseExampleYear05

772

10 years

rr_ExpenseExampleYear10

1,698

1 year

rr_ExpenseExampleNoRedemptionYear01

140

3 years

rr_ExpenseExampleNoRedemptionYear03

445

5 years

rr_ExpenseExampleNoRedemptionYear05

772

10 years

rr_ExpenseExampleNoRedemptionYear10

$ 1,698

Western Asset Adjustable Rate Income 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

^[4]

Small account fee ($)

rr_MaximumAccountFee

none

^[5]

Management fees

rr_ManagementFeesOverAssets

0.45%

Distribution and/or service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other expenses

rr_OtherExpensesOverAssets

0.33%

^[7]

Total annual fund operating expenses

rr_ExpensesOverAssets

1.03%

Fees waived and/or expenses reimbursed

rr_FeeWaiverOrReimbursementOverAssets

(0.15%)

^[6]

Total annual fund operating expenses after waiving fees and/or reimbursing expenses

rr_NetExpensesOverAssets

0.88%

1 year

rr_ExpenseExampleYear01

$ 90

3 years

rr_ExpenseExampleYear03

313

5 years

rr_ExpenseExampleYear05

554

10 years

rr_ExpenseExampleYear10

1,246

1 year

rr_ExpenseExampleNoRedemptionYear01

90

3 years

rr_ExpenseExampleNoRedemptionYear03

313

5 years

rr_ExpenseExampleNoRedemptionYear05

554

10 years

rr_ExpenseExampleNoRedemptionYear10

$ 1,246

Western Asset Adjustable Rate Income Fund | Class R

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

^[4]

Small account fee ($)

rr_MaximumAccountFee

none

^[5]

Management fees

rr_ManagementFeesOverAssets

0.45%

Distribution and/or service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Other expenses

rr_OtherExpensesOverAssets

0.33%

^[7]

Total annual fund operating expenses

rr_ExpensesOverAssets

1.28%

Fees waived and/or expenses reimbursed

rr_FeeWaiverOrReimbursementOverAssets

(0.15%)

^[6]

Total annual fund operating expenses after waiving fees and/or reimbursing expenses

rr_NetExpensesOverAssets

1.13%

1 year

rr_ExpenseExampleYear01

$ 115

3 years

rr_ExpenseExampleYear03

390

5 years

rr_ExpenseExampleYear05

687

10 years

rr_ExpenseExampleYear10

1,532

1 year

rr_ExpenseExampleNoRedemptionYear01

115

3 years

rr_ExpenseExampleNoRedemptionYear03

390

5 years

rr_ExpenseExampleNoRedemptionYear05

687

10 years

rr_ExpenseExampleNoRedemptionYear10

$ 1,532

Western Asset Adjustable Rate Income 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

^[4]

Small account fee ($)

rr_MaximumAccountFee

none

^[5]

Management fees

rr_ManagementFeesOverAssets

0.45%

Distribution and/or service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.20%

Total annual fund operating expenses

rr_ExpensesOverAssets

0.65%

Fees waived and/or expenses reimbursed

rr_FeeWaiverOrReimbursementOverAssets

(0.12%)

^[6]

Total annual fund operating expenses after waiving fees and/or reimbursing expenses

rr_NetExpensesOverAssets

0.53%

1 year

rr_ExpenseExampleYear01

$ 54

3 years

rr_ExpenseExampleYear03

195

5 years

rr_ExpenseExampleYear05

350

10 years

rr_ExpenseExampleYear10

799

1 year

rr_ExpenseExampleNoRedemptionYear01

54

3 years

rr_ExpenseExampleNoRedemptionYear03

195

5 years

rr_ExpenseExampleNoRedemptionYear05

350

10 years

rr_ExpenseExampleNoRedemptionYear10

$ 799

Western Asset Adjustable Rate Income Fund | Class IS

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

^[4]

Small account fee ($)

rr_MaximumAccountFee

none

^[5]

Management fees

rr_ManagementFeesOverAssets

0.45%

Distribution and/or service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.14%

Total annual fund operating expenses

rr_ExpensesOverAssets

0.59%

Fees waived and/or expenses reimbursed

rr_FeeWaiverOrReimbursementOverAssets

(0.16%)

^[6]

Total annual fund operating expenses after waiving fees and/or reimbursing expenses

rr_NetExpensesOverAssets

0.43%

1 year

rr_ExpenseExampleYear01

$ 44

3 years

rr_ExpenseExampleYear03

173

5 years

rr_ExpenseExampleYear05

314

10 years

rr_ExpenseExampleYear10

723

1 year

rr_ExpenseExampleNoRedemptionYear01

44

3 years

rr_ExpenseExampleNoRedemptionYear03

173

5 years

rr_ExpenseExampleNoRedemptionYear05

314

10 years

rr_ExpenseExampleNoRedemptionYear10

$ 723

[1] Shareholders purchasing Class A shares through certain Service Agents or in certain types of accounts may be eligible for a waiver of the sales charge. For additional information, see “Sales charges” in the Prospectus.

[2] The sales charge is waived for shareholders purchasing Class A shares through accounts where LMIS is the broker-dealer of record (“LMIS Accounts”).

[3] You may buy Class A shares in amounts of $500,000 or more at net asset value without an initial sales charge.

[4] Maximum deferred sales charge (load) may be reduced over time.

[5] If your shares are held in a direct account and the value of your account is below $1,000 ($250 for retirement plans that are not employer- sponsored), 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.

[6] 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 effective July 20, 2018 the ratio of total annual fund operating expenses will not exceed 0.88% for Class A shares, 1.63% for Class C shares, 1.38% for Class C1 shares, 0.88% for Class FI shares, 1.13% for Class R shares, 0.53% for Class I shares and 0.43% for Class IS shares, subject to recapture as described below. In addition, the ratio of total annual fund operating expenses for Class IS shares will not exceed the ratio of total annual fund operating expenses for Class I shares, subject to recapture as described below. These arrangements cannot be terminated prior to December 31, 2019 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 in which the manager earned the fee or incurred the expense if the class’ total annual fund operating expenses have fallen to a level below the limits described above. In no case will the manager recapture any amount that would result, on any particular business day of the fund, in the class’ total annual fund operating expenses exceeding the applicable limits described above or any other lower limit then in effect.

[7] “Other expenses” for Class FI and R shares are estimated for the current fiscal year. Actual expenses may differ from estimates.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	LEGG MASON PARTNERS INCOME TRUST
Prospectus Date	rr_ProspectusDate	Sep. 30, 2017
Document Creation Date	dei_DocumentCreationDate	Jul. 20, 2018