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MainStay MacKay Tax Free 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 Tax Free 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)
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 Tax Free 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 0.41% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.07%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.73%
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 $ 372
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 526
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 694
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,179
MainStay MacKay Tax Free 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 0.41% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.10%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.76%
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 $ 326
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 487
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 662
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,169
MainStay MacKay Tax Free Bond Fund | Class B  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none [3]
Maximum Deferred Sales Charge (Load) (as a percentage of the lesser of the original offering price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOfferingPrice 5.00% [3]
Management Fees (as an annual percentage of the Fund's average daily net assets) rr_ManagementFeesOverAssets 0.41% [2],[3]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.50% [3]
Other Expenses rr_OtherExpensesOverAssets 0.10% [3]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.01% [3]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 603
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 622
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 758
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,166
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 103
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 322
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 558
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,166
MainStay MacKay Tax Free 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 0.41% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Other Expenses rr_OtherExpensesOverAssets 0.10%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.01%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 203
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 322
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 558
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,166
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 103
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 322
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 558
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,166
MainStay MacKay Tax Free Bond Fund | Class C2  
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 0.41% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.65%
Other Expenses rr_OtherExpensesOverAssets 0.10%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.16%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 218
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 368
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 638
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,297
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 118
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 368
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 638
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,297
MainStay MacKay Tax Free 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 0.41% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.07%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.48%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 49
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 154
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 269
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 604
MainStay MacKay Tax Free 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 0.41% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.02%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.43%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 44
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 138
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 241
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 542
[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: 0.45% on assets up to $500 million; 0.425% on assets from $500 million to $1 billion; 0.40% on assets from $1 billion to $5 billion; 0.39% on assets from $5 billion to $7 billion; 0.38% on assets from $7 billion to $9 billion; and 0.37% on assets over $9 billion, plus a fee for fund accounting services previously provided by New York Life Investment Management LLC under a separate fund accounting agreement. This fund accounting services fee amounted to 0.01% of the Fund's average daily net assets.
[3] Class B shares are closed to all new purchases as well as additional investments by existing Class B shareholders.