Per the IRS, the 2021 tax filing season is closed permanently for e-filing. You will have to print, sign and mail the return to the IRS. Same holds for your state if your state taxes personal income.
The only version of TurboTax 2021 is permanently closed so they can prepare the online program for the 2022 tax filing season. To complete a 2021 return with TurboTax, you will have to purchase and install the CD version of the program on to your Windows or MAC computer and use that to prepare and print your 2021 tax return.
Only the employer can provide you with a W-2. Some employers subscribe to an online service such as ADP, where you can download the W-2 information directly into the TurboTax program. However, this late in the year that may not be possible with a 2021 W-2. You will have to enter it manually, one keystroke at a time.
If you don't have the W-2 and need it, you will need to contact the employer. As a last resort, you can get a copy of your W-2 from the Social Security Administration at a cost of $126 for each year you need. See https://faq.ssa.gov/en-us/Topic/article/KA-02501 for information on this.
When you mail the return, if you owe any taxes then penalties and interest will be assessed and the IRS will bill you separately for that. Otherwise, if you are due a refund then no penalties will be assessed.
When you print the return with TurboTax, and instruction sheet informs you of what documents to include in your mailing, as well as the address to mail it to. If you also prepare a state tax return, then a physically separate instruction sheet is printed for state tax mailing instructions.
