Updating Summary Prospectus (Form 497VPU)

Voya Retirement Insurance and Annuity Company

and its

Variable Annuity Account C

MAP II

Supplement Dated April 1, 2026, to the Contract Prospectus,

Initial Summary Prospectus, and Updating Summary Prospectus,

each dated May 1, 2025, as amended

This supplement to the variable annuity account contract prospectus ("contract prospectus"), initial summary prospectus, and updating summary prospectus, updates and amends certain information contained in them. Please read this supplement carefully and keep it with the contract prospectus, initial summary prospectus, and updating summary prospectus that you may have received, for future reference. Capitalized terms not defined in this supplement shall have the meaning given to them in the contract prospectus, initial summary prospectus, and updating summary prospectus.

NOTICE OF IMPORTANT INFORMATION ABOUT AN

UPCOMING FUND CHANGE

On January 23, 2026, the Board of Trustees of the Voya Balanced Income Portfolio ( the "Portfolio") approved a number of changes to the structure of the Portfolio that would permit the Portfolio to be sold directly to the public (the "Conversion"). Currently, the purchase and sale of shares of the Portfolio may be made only by separate accounts of insurance companies serving as investment options under variable contracts or by qualified pension or retirement plans, custodian accounts, and certain investment advisers and their affiliates, other investment companies, or permitted investors. Following the Conversion, the eligibility to invest in the Portfolio will be revised and the Portfolio will be offered directly to the public. It is expected that these changes will take effect on or about July 24, 2026 (the "Effective Date").

No insurance company separate accounts will be invested in the Portfolio at the time of the Conversion. Please contact your insurance company for more information about how the Conversion will impact your variable contract and alternative investment options.

Qualified pension and retirement plans will remain eligible to invest in the Portfolio.

There will be no changes to the investment objective, investment strategy or investment risks of the Portfolio as a result of this Conversion.

To facilitate this Conversion, on or about the Effective Date the following changes will occur:

* * * *

MORE INFORMATION IS AVAILABLE

More information about the funds available through your contract, including information about the risks associated with investing in them can be found in the contract prospectus, summary prospectuses, and Statement of Additional Information for each fund. You may obtain these documents by contacting Customer Service.

If you received a summary prospectus for any of the funds available through your contract, you may obtain a full contract prospectus and other fund information free of charge by either accessing the internet address, calling the telephone number or sending an email request to the email address shown on the front of the fund's summary prospectus.

Please retain this supplement for future reference.

Insurance products, annuities and retirement plan funding issued by (third party administrative services may also be provided by) Voya Retirement Insurance and Annuity Company, One Orange Way, Windsor, CT 06095. Securities are distributed by Voya Financial Partners, LLC (member SIPC). Securities may also be distributed through other broker-dealers with which Voya Financial Partners, LLC has selling agreements.