The 3rd EIP payment is based on 2021 income---not on 2020. They were supposed to send those checks out in a hurry last year so they used information from 2020 to send them out. But the credit is really based on your 2021 income. If your 2021 income was too high then you might only get a phased out amount or nothing. If you got it last year you do not have to pay it back, but if you are trying to get it as a recovery rebate credit on your 2021 tax return, it is based ONLY on your 2021 income and on the number of people on your 2021 tax return.
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