There is no place on a 2021 return to enter anything about the 2nd EIP payment. The only way to get that $600 payment is by using the recovery rebate credit on a 2020 tax return, which is what you should have done last year. If you did not use the recovery rebate credit correctly on your 2020 return you can amend 2020 to get it. But first....check your online IRS account and look at line 30 of your 2020 Form 1040. You might have received it without realizing it.
https://www.irs.gov/payments/your-online-account
Select your tax year for amending instructions:
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
