If you have e-filed your 2020 Federal tax return and the tax return is accepted by the IRS, you will have to amend your 2020 Federal tax return and add the entries that were not previously included.
Amended tax returns will not be available until March. See forms availability and this TurboTax Help.
If you have e-filed your 2020 Federal tax return and the tax return is rejected by the IRS, you will be able to add the entries that were not previously included as well as correct the entries that generated the rejection.
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