In late January, the IRS should be sending Letter 6475 that will state the amount you received for the third stimulus payment.
If you have not yet received that letter but would like to file you can set up an account with the IRS to view the payments you received. Once you have set up an account:
- Log in on the IRS website
- Click on View Tax Records.
- Scroll down to Economic Impact Payment Information and click the + sign next to 2021 to view the amount of stimulus you received for Economic Impact Payment 3 which is what will be reported on your 2021 tax return.
Please note that if you are filing jointly, your spouse may have received additional stimulus and they would have to go through the same process to retrieve their information.