From IRS... if you received a stimulus check IN ERROR for a deceased relative or dependent child:
Q41. What should I do to return an Economic Impact Payment (EIP)? (added May 6, 2020)
A41. You should return the payment as described below. If the payment was a paper check:
Write "Void" in the endorsement section on the back of the check.
Mail the voided Treasury check immediately to the appropriate IRS location listed below.
Don't staple, bend, or paper clip the check.
Include a note stating the reason for returning the check.
If the payment was a paper check and you have cashed it, or if the payment was a direct deposit:
Submit a personal check, money order, etc., immediately to the appropriate IRS location listed below.
Write on the check/money order made payable to “U.S. Treasury” and write 2020EIP, and the taxpayer identification number (social security number, or individual taxpayer identification number) of the recipient of the check.
Include a brief explanation of the reason for returning the EIP.
For your paper check, here are the IRS mailing addresses to use based on the state: If you live in… then mail to this address
District of Columbia, Idaho, Illinois, Pennsylvania, Rhode Island IRS - Refund Inquiry Unit 2970 Market St DP 3-L08-151 Philadelphia, PA 19104
Georgia, Iowa, Kansas, Kentucky, Virginia Atlanta Refund Inquiry Unit 4800 Buford Hwy Mail Stop 112 Chamblee, GA 30341
Florida, Louisiana, Mississippi, Oklahoma, Texas Austin Refund Inquiry Unit 3651 S Interregional Hwy 35 Mail Stop 6542 Austin, TX 78741
New York Brookhaven Refund Inquiry Unit 5000 Corporate Ct. Mail Stop 547 Holtsville, NY 11742
Alaska, Arizona, California, Colorado, Hawaii, Nevada, New Mexico, Oregon, Utah, Washington, Wisconsin, Wyoming Fresno Refund Inquiry Unit 5045 E Butler Avenue Mail Stop B2007 Fresno, CA 93888
Arkansas, Connecticut, Delaware, Indiana, Michigan, Minnesota, Missouri, Montana, Nebraska, New Jersey, Ohio, West Virginia Kansas City Refund Inquiry Unit 333 W Pershing Rd Mail Stop 6800, N-2 Kansas City, MO 64108
Alabama, North Carolina, North Dakota, South Carolina, South Dakota, Tennessee Memphis Refund Inquiry Unit 5333 Getwell Rd Mail Stop 8422 Memphis, TN 38118
A foreign country, U.S. possession or territory*, or use an APO or FPO address, or file Form 2555 or 4563, or are a dual-status alien. Austin Refund Inquiry Unit 3651 S Interregional Hwy 35 Mail Stop 6542 AUSC Austin, TX 78741