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MainStay MacKay Strategic Bond Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement to Prospectus [Text Block] rr_SupplementToProspectusTextBlock

THE MAINSTAY FUNDS

 

MainStay MacKay Strategic Bond Fund

 

Supplement dated June 28, 2021 (“Supplement”) to the Summary Prospectus and

Prospectuses each dated February 28, 2021, as supplemented

 

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 Prospectus and Prospectuses.

 

1.Effective July 1, 2021, the Summary Prospectus and Prospectuses are revised as follows:

 

The table and footnotes in the section entitled “Fee and Expenses of the Fund,” as well as the table in the section entitled “Example” are revised as follows:
Risk/Return [Heading] rr_RiskReturnHeading MainStay MacKay Strategic Bond Fund
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the 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 Strategic Bond Fund | Class A  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 4.50%
Maximum Deferred Sales Charge (Load) (as a percentage of the lesser of the original offering price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none [1]
Management Fees (as an annual percentage of the Fund's average daily net assets) rr_ManagementFeesOverAssets 0.60% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Broker Fees and Charges on Short Sales rr_Component1OtherExpensesOverAssets 0.03%
Interest Expense on Securities Sold Short rr_Component2OtherExpensesOverAssets 0.08%
Remainder of Other Expenses rr_Component3OtherExpensesOverAssets 0.23%
Total Other Expenses rr_OtherExpensesOverAssets 0.34%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.19%
Waivers / Reimbursements rr_FeeWaiverOrReimbursementOverAssets none [3]
Total Annual Fund Operating Expenses After Waivers / Reimbursements rr_NetExpensesOverAssets 1.19% [3]
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock No initial sales charge applies on investments of $1 million 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 $ 566
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 811
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,075
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,828
MainStay MacKay Strategic Bond Fund | INVESTOR CLASS  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 4.00%
Maximum Deferred Sales Charge (Load) (as a percentage of the lesser of the original offering price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none [1]
Management Fees (as an annual percentage of the Fund's average daily net assets) rr_ManagementFeesOverAssets 0.60% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Broker Fees and Charges on Short Sales rr_Component1OtherExpensesOverAssets 0.03%
Interest Expense on Securities Sold Short rr_Component2OtherExpensesOverAssets 0.08%
Remainder of Other Expenses rr_Component3OtherExpensesOverAssets 0.29%
Total Other Expenses rr_OtherExpensesOverAssets 0.40%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.25%
Waivers / Reimbursements rr_FeeWaiverOrReimbursementOverAssets none [3]
Total Annual Fund Operating Expenses After Waivers / Reimbursements rr_NetExpensesOverAssets 1.25% [3]
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock No initial sales charge applies on investments of $1 million 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 $ 522
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 781
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,059
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,851
MainStay MacKay Strategic Bond Fund | Class B  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none [4]
Maximum Deferred Sales Charge (Load) (as a percentage of the lesser of the original offering price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther 5.00% [4]
Management Fees (as an annual percentage of the Fund's average daily net assets) rr_ManagementFeesOverAssets 0.60% [2],[4]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00% [4]
Broker Fees and Charges on Short Sales rr_Component1OtherExpensesOverAssets 0.03% [4]
Interest Expense on Securities Sold Short rr_Component2OtherExpensesOverAssets 0.08% [4]
Remainder of Other Expenses rr_Component3OtherExpensesOverAssets 0.30% [4]
Total Other Expenses rr_OtherExpensesOverAssets 0.41% [4]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.01% [4]
Waivers / Reimbursements rr_FeeWaiverOrReimbursementOverAssets none [3],[4]
Total Annual Fund Operating Expenses After Waivers / Reimbursements rr_NetExpensesOverAssets 2.01% [3],[4]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 704
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 930
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,283
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,142
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 204
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 630
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,083
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,142
MainStay MacKay Strategic 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_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as an annual percentage of the Fund's average daily net assets) rr_ManagementFeesOverAssets 0.60% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Broker Fees and Charges on Short Sales rr_Component1OtherExpensesOverAssets 0.03%
Interest Expense on Securities Sold Short rr_Component2OtherExpensesOverAssets 0.08%
Remainder of Other Expenses rr_Component3OtherExpensesOverAssets 0.30%
Total Other Expenses rr_OtherExpensesOverAssets 0.41%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.01%
Waivers / Reimbursements rr_FeeWaiverOrReimbursementOverAssets none [3]
Total Annual Fund Operating Expenses After Waivers / Reimbursements rr_NetExpensesOverAssets 2.01% [3]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 304
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 630
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,083
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,142
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 204
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 630
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,083
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,142
MainStay MacKay Strategic 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_MaximumDeferredSalesChargeOverOther none
Management Fees (as an annual percentage of the Fund's average daily net assets) rr_ManagementFeesOverAssets 0.60% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Broker Fees and Charges on Short Sales rr_Component1OtherExpensesOverAssets 0.03%
Interest Expense on Securities Sold Short rr_Component2OtherExpensesOverAssets 0.08%
Remainder of Other Expenses rr_Component3OtherExpensesOverAssets 0.24%
Total Other Expenses rr_OtherExpensesOverAssets 0.35%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.95%
Waivers / Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.14%) [3]
Total Annual Fund Operating Expenses After Waivers / Reimbursements rr_NetExpensesOverAssets 0.81% [3]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 83
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 289
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 512
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,154
MainStay MacKay Strategic Bond Fund | Class R2  
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_MaximumDeferredSalesChargeOverOther none
Management Fees (as an annual percentage of the Fund's average daily net assets) rr_ManagementFeesOverAssets 0.60% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Broker Fees and Charges on Short Sales rr_Component1OtherExpensesOverAssets 0.03%
Interest Expense on Securities Sold Short rr_Component2OtherExpensesOverAssets 0.08%
Remainder of Other Expenses rr_Component3OtherExpensesOverAssets 0.34%
Total Other Expenses rr_OtherExpensesOverAssets 0.45%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.30%
Waivers / Reimbursements rr_FeeWaiverOrReimbursementOverAssets none [3]
Total Annual Fund Operating Expenses After Waivers / Reimbursements rr_NetExpensesOverAssets 1.30% [3]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 132
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 412
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 713
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,568
MainStay MacKay Strategic Bond Fund | Class R3  
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_MaximumDeferredSalesChargeOverOther none
Management Fees (as an annual percentage of the Fund's average daily net assets) rr_ManagementFeesOverAssets 0.60% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Broker Fees and Charges on Short Sales rr_Component1OtherExpensesOverAssets 0.03%
Interest Expense on Securities Sold Short rr_Component2OtherExpensesOverAssets 0.08%
Remainder of Other Expenses rr_Component3OtherExpensesOverAssets 0.32%
Total Other Expenses rr_OtherExpensesOverAssets 0.43%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.53%
Waivers / Reimbursements rr_FeeWaiverOrReimbursementOverAssets none [3]
Total Annual Fund Operating Expenses After Waivers / Reimbursements rr_NetExpensesOverAssets 1.53% [3]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 156
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 483
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 834
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,824
MainStay MacKay Strategic 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_MaximumDeferredSalesChargeOverOther none
Management Fees (as an annual percentage of the Fund's average daily net assets) rr_ManagementFeesOverAssets 0.60% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Broker Fees and Charges on Short Sales rr_Component1OtherExpensesOverAssets 0.06%
Interest Expense on Securities Sold Short rr_Component2OtherExpensesOverAssets 0.10%
Remainder of Other Expenses rr_Component3OtherExpensesOverAssets 0.07%
Total Other Expenses rr_OtherExpensesOverAssets 0.23%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.83%
Waivers / Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.02%) [3]
Total Annual Fund Operating Expenses After Waivers / Reimbursements rr_NetExpensesOverAssets 0.81% [3]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 83
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 263
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 459
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,023
MainStay MacKay Strategic Bond Fund | SIMPLE CLASS  
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_MaximumDeferredSalesChargeOverOther none
Management Fees (as an annual percentage of the Fund's average daily net assets) rr_ManagementFeesOverAssets 0.60% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Broker Fees and Charges on Short Sales rr_Component1OtherExpensesOverAssets 0.03%
Interest Expense on Securities Sold Short rr_Component2OtherExpensesOverAssets 0.08%
Remainder of Other Expenses rr_Component3OtherExpensesOverAssets 0.29%
Total Other Expenses rr_OtherExpensesOverAssets 0.40%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.50%
Waivers / Reimbursements rr_FeeWaiverOrReimbursementOverAssets none [3]
Total Annual Fund Operating Expenses After Waivers / Reimbursements rr_NetExpensesOverAssets 1.50% [3]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 153
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 474
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 818
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,791
[1] No initial sales charge applies on investments of $1 million 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: 0.60% on assets up to $500 million; 0.55% on assets from $500 million up to $1 billion; 0.50% on assets from $1 billion to $5 billion; and 0.475% on assets over $5 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] 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 expenses (including interest on securities sold short), 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 Class I shares do not exceed 0.70% of its average daily net assets. In addition, New York Life Investments will waive fees and/or reimburse expenses so that Total Annual Fund Operating Expenses (excluding taxes, interest expenses (including interest on securities sold short), 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 Class R6 do not exceed those of Class I. 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. Total Annual Fund Operating Expenses After Waivers/Reimbursements have been restated to reflect the current contractual arrangement.
[4] Class B shares are closed to all new purchases as well as additional investments by existing Class B shareholders.