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If the return is rejected you can make the necessary changes and e-file again.
If the return is accepted you will have to amend your original tax return. An amended return, Form 1040X, can only be printed and mailed to the IRS if the original tax return was not e-filed. The IRS will take up to 16 weeks or longer to process an amended tax return.
Before starting to amend the tax return, wait for the tax refund to be received or the taxes due to be paid and processed by the IRS.
See this TurboTax support FAQ on amending a tax return originally completed and filed using the 2020 TurboTax online editions - https://ttlc.intuit.com/community/amending/help/how-do-i-amend-my-turbotax-online-return/01/27577
The IRS Form 1040-X for amending a 2020 tax return is scheduled to be available on 03/25/2021 (subject to change)
Will TurboTax notify users when the form 2020-1040X is available?
Will we be able to file the 2020-1040X through the TurboTax program when it is available?
The scheduled date of 2020-1040X Form availability is still 3/25/2021?
Yes, according to the forms availability table it is still set for 3/25/2021.
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Forms table shows 3/18.
Still probably to late after President approves COVID Tax relief. I should still get retro IRA contribution credit and full stimulus pay out, even if I file after the President signs the bill later this week.