If your return is Rejected, you'll be able to open it and correct your entry in the Federal Review section for the Recovery Rebate Credit ane efile again.
There was actually no calculation involved; all you had to do was enter the Stimulus Payments you actually received. TurboTax then calculated your credit based on the people on your 2020 return, so you may not have entered incorrectly.
If you return is accepted, wait until you receive your refund before attempting to Amend your Return; the IRS may make the adjustment for you if your entry was incorrect.
Click this link for more info on the Recovery Rebate Credit.
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