You should now file the missing state return. There is no penalty if you are entitled for a refund.
If you filed a federal return in 2017 with TurboTax, you can amend your return and add the state return.
Please see the
following TurboTax FAQ for
instructions on how to amend your tax return in TurboTax.
https://ttlc.intuit.com/replies/3288565
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