amend 2021 tax return

[JamesG1]

You would amend your 2021 IRS form 1040 income tax return as you would for any other tax year except that amended tax returns for 2021 may no longer be accepted by the IRS.

Instructions for form 1040X, page 3, states:

Generally, for a credit or refund, you must file Form 1040-X within 3 years (including extensions) after the date you filed your original return or within 2 years after the date you paid the tax, whichever is later. 

A 2021 IRS form1040 income tax return would have been filed in April 2022 and three years would have expired in April of 2025.

If you used TurboTax Online, log in to your account and select Amend a return that was filed and accepted. 

If you used the CD/download product, sign back into your return and select Amend a filed return. 

See also this TurboTax Help.