For tax years 2021, 2020, or 2019
To file a new prior-year return, you'll need to purchase and download that year's TurboTax software for PC or Mac, as TurboTax Online and the mobile app are only available for the current tax year. (Note: Returns for tax years 2018 and earlier are no longer eligible to be filed through TurboTax.)
Prior-year returns must be paper-filed, as e-filing is no longer available for them. We'll walk you through that process when you get to the File section in the software.
After installing the software, open it and follow the onscreen instructions to file your return.
Here are some other resources that might help: