It is not taxable and you aren't paying it back. Your 2021 return starts out by assuming you didn't get any Stimulus payments so it gives you credit for the full amount and your refund was too high. Then near the end you enter how much you actually got so it only gives you the difference if any. So you don't get it again.
Look at your tax return. It is not added as income anywhere or subtracted anywhere. The Recovery rebate credit on line 30 is only if you didn't get the Stimulus payment or qualify for more.
TRY THIS.....
So do this to check. Put down 0 for the Stimulus payments like if you didn't get it. Then look at your return especially line 30 and see that Turbo Tax gives you the 1400 or 2800 credit on line 30. See what your refund is. Then go back and enter the amounts you already got and check your return. You don't get credit for it again on line 30 since you already got it.
Its not taking it away. It's just not giving it to you again.
