After you file

The IRS will adjust you tax return accordingly and remove the credit from the federal tax refund.  You do not have to amend.

See this IRS website - https://www.irs.gov/newsroom/2020-recovery-rebate-credit-topic-g-correcting-issues-after-the-2020-ta...

 

 

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?