Hi there,

If I understand your situation correctly, it sounds like you're amending to correct the amount of EIP received in 2020 (and thus make your client eligible for some or all of the Recovery Rebate Credit). To do this:

1. First, make sure you've activated the 1040X by going to Miscellaneous Forms > Amended Return (1040-X) and checking that the "Amending federal return" box is marked. It's important to do this first to freeze the "as originally filed" amounts.
2. Go to Credits > Recovery Rebate, EIC, Residential Energy, Oth Credits
3. Correct your entries for EIP 1 and EIP 2 so that only amounts received in 2020 are listed here. If either entry should be zero, make sure to enter -1 in that field.

This should allow the Recovery Rebate Credit to calculate correctly, and the credit increase to flow to the 1040X. 

- Rebecca