Mainstay Funds Trust N-14 Registration statement for investment companies business combination

Exhibit 14(a)

Consent of Independent Registered Public Accounting Firm

We consent to the use of our reports with respect to the financial statements and financial highlights of each of the funds comprising MainStay Funds Trust and The MainStay Funds, incorporated herein by reference, and to the references to our firm under the headings “Disclosure of Portfolio Holdings” and “Independent Registered Public Accounting Firm” in the Statement of Additional Information.

/s/ KPMG LLP

Philadelphia, Pennsylvania

May 8, 2023