There is no reason to amend because you received the $1400 3rd stimulus check. There was no place at all to put anything about that check on a 2020 tax return. You could, however, enter whether you received the 1st or 2nd stimulus amounts by completing the recovery rebate credit on your 2020 return. Did you receive the 1st check for $1200 or the 2nd check for $600? If not then you can still get those by entering it on a 2020 return or an amended 2020 return.
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