The Recovery Rebate Credit on your tax return is based only on the information in your 2020 tax return. The total stimulus amount your are eligible for is established based on your 2020 tax return and then once you enter any stimulus payments your already received, that credit is reduced on your tax return.
So for a single filer your Recovery Rebate Credit eligibility amount would be $1200 and $600 for a total of $1800. If you received those amounts in rounds one and two respectively, then your credit would be reduce to zero; you received what you are eligible for. However, if you received something less, then your credit will reflect the missing amounts.
Here is a link with more information on the Recovery Rebate Credit.
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