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Label Element Value
AIG Flexible Credit Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] ck0000795307_SupplementTextBlock

SunAmerica Income Funds


AIG Flexible Credit Fund


Class A, Class C, Class W


(the “Fund”)


Supplement dated November 19, 2018, to the Summary Prospectus, Prospectus


and Statement of Additional Information


each dated July 30, 2018, as supplemented and amended to date


Effective November 19, 2018, pursuant to an Amended and Restated Advisory Fee Waiver Agreement, SunAmerica Asset Management, LLC has contractually agreed to waive further a portion of its fees payable by the Fund through July 31, 2020. Accordingly, the following changes to the Summary Prospectus, Prospectus and Statement of Additional Information are effective as of November 19, 2018:

Risk/Return [Heading] rr_RiskReturnHeading AIG Flexible Credit Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

The table in the section of the Fund’s Summary Prospectus entitled “Fees and Expenses of the Fund” and the table in the subsection of the Fund’s Prospectus entitled “Fund Highlights: AIG Flexible Credit Fund – Fees and Expenses of the Fund” are deleted in their entirety and replaced with the following:

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 Jul. 31, 2020
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

The subsection of the Fund’s Summary Prospectus entitled “Fees and Expenses of the Fund – Example” and the subsection of the Fund’s Prospectus entitled “Fund Highlights: AIG Flexible Credit Fund – Fees and Expenses of the Fund – Example” are deleted in their entirety and replaced with the following:


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 that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same and that all fee waivers and/or reimbursements remain in place through the term of the applicable waiver and/or expense reimbursement. Although your actual costs may be higher or lower, based on these assumptions and the net expenses shown in the fee table, your costs would be:

Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption You would pay the following expenses if you did not redeem your shares:
Expense Example Closing [Text Block] rr_ExpenseExampleClosingTextBlock

PLEASE RETAIN THIS SUPPLEMENT FOR FUTURE REFERENCE.

AIG Flexible Credit Fund | Class A  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 4.75%
Maximum Deferred Sales Charge (Load) (as a percentage of the lesser of the amount redeemed or original purchase cost) rr_MaximumDeferredSalesChargeOverOfferingPrice none [1]
Maximum Sales Charge (Load) Imposed on Reinvested Dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee rr_RedemptionFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 0.74%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.35%
Other Expenses rr_OtherExpensesOverAssets 0.35%
Total Annual Fund Operating Expenses Before Fee Waiver and/or Expense Reimbursement rr_ExpensesOverAssets 1.44%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.40% [2],[3]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.04% [2],[3]
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts Purchases of Class A shares of $1 million or more will be subject to a contingent deferred sales charge (“CDSC”) on redemptions made within two years of purchase.
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 576
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 871
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,188
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,085
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 576
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 871
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,188
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,085
AIG Flexible Credit Fund | Class C  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of the lesser of the amount redeemed or original purchase cost) rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00% [1]
Maximum Sales Charge (Load) Imposed on Reinvested Dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee rr_RedemptionFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 0.74%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.36%
Total Annual Fund Operating Expenses Before Fee Waiver and/or Expense Reimbursement rr_ExpensesOverAssets 2.10%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.40% [2],[3]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.70% [2],[3]
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock The CDSC on Class C shares applies only if shares are redeemed within twelve months of their purchase. See pages 19-21 of the Prospectus for more information about the CDSCs.
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 273
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 619
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,092
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,400
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 173
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 619
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,092
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,400
AIG Flexible Credit Fund | Class W  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of the lesser of the amount redeemed or original purchase cost) rr_MaximumDeferredSalesChargeOverOfferingPrice none [1]
Maximum Sales Charge (Load) Imposed on Reinvested Dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee rr_RedemptionFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 0.74%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.49%
Total Annual Fund Operating Expenses Before Fee Waiver and/or Expense Reimbursement rr_ExpensesOverAssets 1.23%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.40% [2],[3]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.83% [2],[3]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 85
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 351
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 637
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,453
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 85
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 351
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 637
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,453
[1] Purchases of Class A shares of $1 million or more will be subject to a contingent deferred sales charge ("CDSC") on redemptions made within two years of purchase. The CDSC on Class C shares applies only if shares are redeemed within twelve months of their purchase. See pages 19-21 of the Prospectus for more information about the CDSCs.
[2] Pursuant to an Advisory Fee Waiver Agreement, effective November 19, 2018, SunAmerica is contractually obligated to waive its management fee with respect to the Fund so that the management fee payable by the Fund to SunAmerica equals 0.34% of average daily net assets. This agreement will continue in effect through July 31, 2020, and from year to year thereafter provided such continuance is agreed to by SunAmerica and approved by a majority of the Independent Trustees.
[3] Pursuant to an Expense Limitation Agreement, SunAmerica Asset Management, LLC ("SunAmerica") is contractually obligated to waive its fees and/or reimburse expenses to the extent that the Total Annual Fund Operating Expenses exceed 1.45%, 2.10% and 1.25% for Class A, Class C and Class W shares, respectively. For purposes of the Expense Limitation Agreement, "Total Annual Fund Operating Expenses" shall not include extraordinary expenses (i.e., expenses that are unusual in nature and/or infrequent in occurrence, such as litigation), or acquired fund fees and expenses, brokerage commissions and other transactional expenses relating to the purchase and sale of portfolio securities, interest, taxes and governmental fees, and other expenses not incurred in the ordinary course of the Fund's business. This agreement will continue in effect indefinitely, unless terminated by the Board of Trustees, including a majority of the trustees of the Board of Trustees who are not "interested persons" of SunAmerica Income Funds as defined in the Investment Company Act of 1940, as amended (the "Independent Trustees").