You can use TurboTax to prepare the 2020 state income tax return - but as it is a prior year return, you will not be able to electronically file the return. Rather, you will need to print and mail the return to the state.
I recommend using certified mail. I also recommend calling the state (often the state notices will have a contact number listed), and let them know you are sending the completed return in. The letter may also have a fax number where you can fax the return to instead of mailing.
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