The IRS allows you to e-file amended returns for the current tax year Federal return and the two prior tax years if your original return was also e-filed. For older tax years, you'll need to file by mail.
See this help article for instructions to amend your Federal return for a prior year return.
To find your previous years' returns, in TurboTax Online:
When you first open your return and see "let's keep working on your taxes", scroll down to the section "Your tax returns and documents". If you prepared your 2021 tax return in TurboTax, in the same account, you should see "2021" listed among the documents you can select to view. If you used a different TurboTax account for 2021, you would need to log in to that account to view your return. See this help article for more information.
If you need to amend only your state return, please see this help article for instructions for both TurboTax Online and TurboTax Desktop.
See this help article regarding which states allow e-filing of amended returns. They may also require that the original return have been e-filed.
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