Form 5405, Repayment of the First-Time Homebuyer Credit is not just for a change of ownership but also to report the repayment of the homebuyer credit every year.
I’m guessing that you did not include the $500 payment on your return so IRS assumed you sold your home.
Check your Form 1040, Schedule 2, line 10 to see whether you have $500 on that line.
To add Form 5405:
- Start the amend process: How do I amend my 2021 return?
- Type homebuyer credit in Search in the top right
- Select Jump to homebuyer credit and complete the info
- Send your amended return to IRS
