Why do I have to mail my state return

[jamie71282]

My federal return was successfully e filed but it says I have to mail my state refund?

[GeorgeDenseff]

You have something in it that cannot be efiled in your state.

[SteamTrain]

Something that can also happen occasionally, is that some states will allow printed-mailed tax returns on dates before they allow e-filing, and you may be in a situation where the mail-filing is allowed right now, but e-filing won't be allowed (By the state itself) for another couple weeks. 

IF that happens to be the situation for your state tax forms (and not just a matter of a certain required paper form),  you may be able to wait until the IRS accepts your Federal e-file....then wait a couple weeks and come back to try to  E-file your state.

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Check here:

State forms availability table for TurboTax individual (personal) tax products (intuit.com)