TurboTax cannot block a tax return from being filed using other tax preparation software or being filed by a tax professional or individual.
Using TurboTax a 2021 tax return can only be printed and mailed, it cannot be e-filed.
If you are using another service or tax professional that can e-file a 2021 tax return, that return can be rejected by the IRS if another tax return has already been received by the IRS with the same Social Security number.
