Did you complete the 2021 tax return using the TurboTax online editions? If so, follow this procedure -
To access your prior year online tax returns sign onto the TurboTax website with the User ID you used to create the account - https://myturbotax.intuit.com/
Start the 2023 online tax return by entering some personal information then click on Tax Home on the left side of the screen.
On the Tax Home webpage -
Scroll down to the section Your tax returns & documents. Click on the Year 2021 and Click on Amend (change) 2021 return
If you need a blank IRS Form 1040-X for tax year 2021 go to this IRS website - https://www.irs.gov/pub/irs-prior/f1040x--2021.pdf
