You will not be able to amend your tax return until it has been accepted by the IRS. Please see the below FAQ for more information on amending a 2020 tax return:
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If you want to review and update your 2020 return, please enter your information here by February 6, to have your 2020 tax return sent back to you. You will then receive an email from TurboTax on February 8, letting you know that your return is available and providing you with detailed instructions on how to review, update and re-file your tax return without the Recovery Rebate Credit.