If my Indiana state tax form was accepted electronically, and I have no balance (just a refund), do I still need to file something on paper?

[SteamTrain]

Should not have to...but save all your W-2 forms and tax documents in a folder.

States do come back later and randomly check-up on tax documents, even if nothing is wrong.  

Occasionally a state tax withholding value seems wrong to them, and they ask to see the official copy of your W-2...if not more....never throw those away.