When you save your information in TurboTax CD/Download for tax year 2021, the info is stored in a file with the extension tt21. For example, if Darcy Doe uses TurboTax to complete their 2021 tax return, the information is saved in the Darcy.tt21 file.
Similarly, if Darcy enters only some of their tax information and intends to complete the tax return later, when they save their information before closing TurboTax, the information is stored in the Darcy.tt21 file.
In other words, after you enter your information in TurboTax and save it, TurboTax creates a file on your computer with the extension ttyy, where yy represents the last two digits of the tax year. We refer to this file as the tax data file.
Note: For printing and future reference, consider saving a PDF copy of your tax return.