@Richard_E9
It is addressed by New York State at the following link: NY E-file mandate.
Their requirement is to e-file when the return meets three conditions:
- you use software to prepare your own personal income tax return; and
- your software supports the electronic filing of your return; and (Italics added)
- you have broadband Internet access.
Although TurboTax supports current-year e-filing (which would require a 2020 NY return to be e-filed), TurboTax no longer supports e-filing for any prior-year returns. So even though you get that diagnostic, you may ignore it and mail in the return to NY.
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