The tax year 2021 federal tax return can only be printed and mailed when using TurboTax, it cannot be e-filed.
Tax professional software will allow the e-filing of 2021 federal tax returns, but you would have to pay a local tax professional to complete and e-file the 2021 return.
Note - The IRS is not accepting any e-filed tax returns until they open e-filing for the 2023 returns which should be sometime in either mid to late January 2024.
