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MainStay MacKay U.S. Infrastructure Bond Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement to Prospectus [Text Block] rr_SupplementToProspectusTextBlock

MAINSTAY GROUP OF FUNDS

 

MainStay MacKay California Tax Free Opportunities Fund
MainStay MacKay High Yield Municipal Bond Fund

MainStay MacKay New York Tax Free Opportunities Fund

MainStay MacKay Tax Free Bond Fund

MainStay MacKay U.S. Infrastructure Bond Fund
(each a “Fund” and collectively the “Funds”)

 

Supplement dated June 10, 2022 (“Supplement”) to the

 

MainStay Fixed Income and Mixed Asset Funds Summary Prospectuses and Prospectus,

each dated February 28, 2022, as supplemented,

 

and

 

Statement of Additional Information, dated February 28, 2022, as supplemented and amended (“SAI”)

 

Capitalized terms and certain other terms used in this Supplement, unless otherwise defined in this Supplement, have the meanings assigned to them in the Summary Prospectuses, Prospectus and SAI. The information in this Supplement supersedes any conflicting information in the Summary Prospectus, Prospectuses and SAI.

 

The following changes are effective August 10, 2022:

 

1.Fees and Expenses of the Funds and Examples. Each Fund’s fees and expenses table and example table are deleted in their entirety and replaced with the following, which have been restated to reflect a reduction in the Maximum Sales Charge imposed on purchases of Class A and Investor Class shares:
Risk/Return [Heading] rr_RiskReturnHeading MainStay MacKay U.S. Infrastructure Bond Fund
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 Feb. 28, 2023
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Assuming redemption at end of period
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption Assuming no redemption
Expense Example Closing [Text Block] rr_ExpenseExampleClosingTextBlock

PLEASE RETAIN THIS SUPPLEMENT FOR YOUR FUTURE REFERENCE.
MainStay MacKay U.S. Infrastructure Bond Fund | Class A  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 3.00%
Maximum Deferred Sales Charge (Load) (as a percentage of the lesser of the original offering price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOfferingPrice none [1]
Management Fees (as an annual percentage of the Fund's average daily net assets) rr_ManagementFeesOverAssets 0.50% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.21%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.96%
Waivers / Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.11%) [3],[4]
Total Annual Fund Operating Expenses After Waivers / Reimbursements rr_NetExpensesOverAssets 0.85% [3],[4]
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock No initial sales charge applies on investments of $250,000 or more (and certain other qualified purchases). However, a contingent deferred sales charge of 1.00% may be imposed on certain redemptions made within 18 months of the date of purchase on shares that were purchased without an initial sales charge.
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 384
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 586
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 805
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,433
MainStay MacKay U.S. Infrastructure Bond Fund | INVESTOR CLASS  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 2.50%
Maximum Deferred Sales Charge (Load) (as a percentage of the lesser of the original offering price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOfferingPrice none [1]
Management Fees (as an annual percentage of the Fund's average daily net assets) rr_ManagementFeesOverAssets 0.50% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.58%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.33%
Waivers / Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.16%) [3],[4]
Total Annual Fund Operating Expenses After Waivers / Reimbursements rr_NetExpensesOverAssets 1.17% [3],[4]
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock No initial sales charge applies on investments of $250,000 or more (and certain other qualified purchases). However, a contingent deferred sales charge of 1.00% may be imposed on certain redemptions made within 18 months of the date of purchase on shares that were purchased without an initial sales charge.
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 366
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 646
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 946
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,798
MainStay MacKay U.S. Infrastructure Bond Fund | Class B  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none [5]
Maximum Deferred Sales Charge (Load) (as a percentage of the lesser of the original offering price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOfferingPrice 5.00% [5]
Management Fees (as an annual percentage of the Fund's average daily net assets) rr_ManagementFeesOverAssets 0.50% [2],[5]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00% [5]
Other Expenses rr_OtherExpensesOverAssets 0.58% [5]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.08% [5]
Waivers / Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.16%) [3],[4],[5]
Total Annual Fund Operating Expenses After Waivers / Reimbursements rr_NetExpensesOverAssets 1.92% [3],[4],[5]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 695
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 936
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,304
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,206
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 195
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 636
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,104
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,206
MainStay MacKay U.S. Infrastructure Bond 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 original offering price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00%
Management Fees (as an annual percentage of the Fund's average daily net assets) rr_ManagementFeesOverAssets 0.50% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.58%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.08%
Waivers / Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.16%) [3],[4]
Total Annual Fund Operating Expenses After Waivers / Reimbursements rr_NetExpensesOverAssets 1.92% [3],[4]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 295
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 636
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,104
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,206
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 195
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 636
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,104
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,206
MainStay MacKay U.S. Infrastructure Bond Fund | Class I  
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 original offering price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees (as an annual percentage of the Fund's average daily net assets) rr_ManagementFeesOverAssets 0.50% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.21%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.71%
Waivers / Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.11%) [3],[4]
Total Annual Fund Operating Expenses After Waivers / Reimbursements rr_NetExpensesOverAssets 0.60% [3],[4]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 61
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 216
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 384
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 872
MainStay MacKay U.S. Infrastructure Bond Fund | Class R6  
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 original offering price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees (as an annual percentage of the Fund's average daily net assets) rr_ManagementFeesOverAssets 0.50% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.06%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.56%
Waivers / Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.03%) [3],[4]
Total Annual Fund Operating Expenses After Waivers / Reimbursements rr_NetExpensesOverAssets 0.53% [3],[4]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 54
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 176
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 310
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 699
[1] No initial sales charge applies on investments of $250,000 or more (and certain other qualified purchases). However, a contingent deferred sales charge of 1.00% may be imposed on certain redemptions made within 18 months of the date of purchase on shares that were purchased without an initial sales charge.
[2] The management fee is as follows: 0.50% on assets up to $500 million; 0.475% on assets from $500 million to $1 billion; and 0.45% on assets over $1 billion.
[3] New York Life Investment Management LLC ("New York Life Investments") has contractually agreed to waive fees and/or reimburse expenses so that Total Annual Fund Operating Expenses (excluding taxes, interest, litigation, extraordinary expenses, brokerage and other transaction expenses relating to the purchase or sale of portfolio investments, and acquired (underlying) fund fees and expenses) for a class do not exceed the following percentage of its average daily net assets: Class A, 0.85% and Class R6, 0.53%. New York Life Investments will apply an equivalent waiver or reimbursement, in an equal number of basis points of the Class A shares waiver/reimbursement to Investor Class, Class B, Class C and Class I shares. This agreement will remain in effect until February 28, 2023, and shall renew automatically for one-year terms unless New York Life Investments provides written notice of termination prior to the start of the next term or upon approval of the Board of Trustees of the Fund.
[4] New York Life Investments has contractually agreed to limit the transfer agency expenses charged to each of the Fund’s share classes to a maximum of 0.35% of that share class’s average daily net assets on an annual basis after deducting any applicable Fund or class-level expense reimbursements or small account fees. This agreement will remain in effect until February 28, 2023, and shall renew automatically for one-year terms unless New York Life Investments provides written notice of termination prior to the start of the next term or upon approval of the Board of Trustees of the Fund.
[5] Class B shares are closed to all new purchases as well as additional investments by existing Class B shareholders.