You can e-file or mail in your Form CT-1040NR/PY. TurboTax will give you both options in the File section. Connecticut income tax is based on federal adjusted gross income (AGI). If you e-file federal you should e-file CT-1040NR/PY.
If you mail your federal you will have to mail CT-1040NRPY. You will not be able to e-file Connecticut if you mail in federal.
TurboTax suggests e-filing federal and state together.
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