Exhibit (d)(5)(a)

MAINSTAY FUNDS TRUST

AMENDMENT TO THE SUBADVISORY AGREEMENT

This Amendment to the Subadvisory Agreement, is made as of the 5^th day of December, 2019, between New York Life Investment Management LLC, a Delaware limited liability company (the “Manager”) and NYL Investors LLC, a Delaware limited liability company (the “Subadvisor”).

WHEREAS, the Manager and the Subadvisor are parties to a Subadvisory Agreement, dated May 1, 2014, the “Subadvisory Agreement”); and

WHEREAS, the parties hereby wish to amend the Subadvisory Agreement to revise the name of the MainStay Index Bond Fund to “MainStay Short Term Bond Fund”.

NOW, THEREFORE, the parties agree as follows:

(i) Effective December 5, 2019, Schedule A is hereby amended by deleting it in its entirety and replacing it with the Schedule attached hereto.

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IN WITNESS WHEREOF, the parties hereto have caused this instrument to be executed by their officers designated below as of the 5^th day of December, 2019. This Agreement may be signed in counterparts.

NEW YORK LIFE INVESTMENT MANAGEMENT LLC
Attest:	/s/ J. Kevin Gao	By:	/s/ Yie-Hsin Hung
Name:	J. Kevin Gao	Name:	Yie-Hsin Hung
Title:	Managing Director and Associate General Counsel	Title:	Chief Executive Officer
NYL INVESTORS LLC
Attest:	/s/ Maureen A. Cronin	By:	/s/ Amaury J. Rzad
Name:	Maureen A. Cronin	Name:	Amaury J. Rzad
Title:	Managing Director, Associate General Counsel and Assistant Secretary	Title:	Senior Managing Director

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SCHEDULE A

(Effective as of December 5, 2019)

As compensation for services provided by Subadvisor the Manager will pay the Subadvisor and Subadvisor agrees to accept as full compensation for all services rendered hereunder, at an annual subadvisory fee equal to the following:

SERIES NAME	ANNUAL RATE
MainStay Balanced Fund * (fixed income sleeve)	0.35% up to $1 billion; 0.325% from $1 billion up to $2 billion; and 0.30% in excess of $2 billion
MainStay Floating Rate Fund*	0.30% up to $1 billion; 0.2875% from $1 billion up to $3 billion; and 0.2825% in excess of $3 billion
MainStay Short Term Bond Fund*	0.125% up to $1 billion; and 0.10% in excess of $1 billion

The portion of the fee based upon the average daily net assets of the respective Series shall be accrued daily at the rate of 1/(number of days in calendar year) of the annual rate applied to the daily net assets of the Series.

*With respect to this Series, the Manager has agreed to waive a portion of the Series’ management fee or reimburse the expenses of the appropriate class of the Series so that the class’s total ordinary operating expenses do not exceed certain amounts. These waivers or expenses limitations may be changed with Board approval. To the extent that the Manager has agreed to waive its management fee or reimburse expenses, the Subadvisor has voluntarily agreed to waive or reimburse its fee proportionately.

The annual rate is based on the percentage that the Allocated Assets constitutes of the Series’ total average daily net assets.

Payment will be made to the Subadvisor on a monthly basis.