July 21, 2020 State Street Bank and Trust Company One Heritage Drive North Quincy, Massachusetts 02171 Location Code: OHD0310 Attention: Russell M. Donohoe Re: Master Custodian Agreement – New Portfolio Ladies and Gentlemen:

July 21, ▇▇▇▇

▇▇▇▇▇ ▇▇▇▇▇▇ Bank and Trust Company

▇▇▇ ▇▇▇▇▇▇▇▇ ▇▇▇▇▇

▇▇▇▇▇ ▇▇▇▇▇▇, ▇▇▇▇▇▇▇▇▇▇▇▇▇ ▇▇▇▇▇

Location Code: OHD0310

Attention:  ▇▇▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇

Re: Master Custodian Agreement – New Portfolio

Ladies and Gentlemen:

Please be advised that the undersigned Fund has established one (1) new series of shares to be known as American Century Asset Allocation Portfolios, Inc. - One Choice 2065 Portfolio (the “New Portfolio”).

In accordance with Section 18.6, the Additional Portfolios provision, of the Master Custodian Agreement dated as of July 29, 2011 (the “Custodian Agreement”) by and among each Fund party thereto and State Street Bank and Trust Company, the undersigned Fund hereby requests that your bank act as Custodian for the New Portfolio under the terms of the Custodian Agreement. In connection with such request, the undersigned Fund hereby confirms to you, as of the date hereof, its representations and warranties set forth in Section 18.7 of the Custodian Agreement. Capitalized terms used herein without definition shall have the meanings ascribed to them in the Custodian Agreement.

Kindly indicate your acceptance of the foregoing by executing this letter agreement and returning a copy to the Fund.

             Sincerely,

American Century Investment Management, Inc.

on behalf of American Century Asset Allocation Portfolios, Inc. - One Choice 2065 Portfolio

By:  /s/ ▇▇▇▇ ▇. ▇▇▇▇▇

Name: ▇▇▇▇ ▇. ▇▇▇▇▇

Title: Vice President

Agreed and Accepted:

STATE STREET BANK AND TRUST COMPANY

By: /s/ ▇▇▇▇▇ ▇▇▇▇▇▇

Name: ▇▇▇▇▇ ▇▇▇▇▇▇

Title: Executive Vice President

Effective Date: July 21, 2020

American Century Investments

P.O. Box 410141, ▇▇▇▇ ▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇.▇▇▇ Corporate Headquarters: Kansas City, MO

▇▇▇▇▇▇ ▇▇▇▇, ▇▇ ▇▇▇▇▇-▇▇▇▇ 800-345-2021 or 816-531-5575