It depends. Since you have already submitted your 2020 tax return electronically, you will have to wait until your tax return was either accepted or rejected.
- If your e-filed return is still pending. Wait until the return is accepted before amending.
- If your return has already been accepted. You will need to amend your tax return.
- If rejected, just make your changes and then resubmit or mail your return.
If you determine that you need to amend your tax return: TurboTax: How do I amend my tax return
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