I accidently claimed exempt on my state taxes.

[Mitsubishi12391]

For the last 5 months I have not been paying any state tax. I'm not sure how I include this information when filing this year. 

[ErnieS0]

You don’t have to do anything extra to have this information included when filing this year. Your state income tax information will be included on your W-2 in lines 15-20.

If you have not been paying any state tax—and are living and/or working in a state with an income tax—then you will probably owe money to state when you file. Give your employer a state withholding form so they can begin taking state tax out again.