W-4 forms and federal & state taxes?

You would need to fill out 2 different forms...one for state and one for fed. it you claim the same on your federal w-4..your federal withholding should stay the same. If you live in NJ and work in NY your employer should withhold NJ state tax accordingly. You pay taxes in the state you live in. If you had NY state tax taken out..(if they pay state tax in NY) you may have to file a non-resident form to get it back. Hope this helps.