From the IRS:
Q G2. I made a mistake when calculating the 2020 Recovery Rebate Credit on my return. How do I fix i...
A2. DO NOT file an amended tax return with the IRS. If you entered an amount on line 30 but made a mistake in calculating the amount, the IRS will calculate the correct amount of the Recovery Rebate Credit, make the correction to your tax return and continue processing your return. If a correction is needed, there may be a slight delay in processing your return and the IRS will send you a notice explaining any change made.
To check the status of your refund from your original return, check Where's My Refund?
If you did not enter an amount on line 30 of your Form 1040 or Form 1040-SR, see I'm eligible for a 2020 Recovery Rebate Credit but did not claim it on my 2020 tax return. Do I need...
