@jamleach1 The Recovery Rebate Credit on the 2020 federal tax return is based on the 2020 AGI.
IRS website for the Recovery Rebate Credit - https://www.irs.gov/newsroom/recovery-rebate-credit
Economic Impact Payments were based on your 2018 or 2019 tax year information. The Recovery Rebate Credit is similar except that the eligibility and the amount are based on 2020 information you include on your 2020 tax return.
The IRS Recovery Rebate Credit Worksheet used to calculate the Credit uses the 2020 AGI from Line 11 of the 2020 Form 1040.
IRS Form 1040 (2020) Instructions for the Recovery Rebate Credit Worksheet page 58 (Line 11 of the Worksheet) - https://www.irs.gov/pub/irs-pdf/i1040gi.pdf#page=58
