Not sure what you are talking about.
For Federal taxes, IF you were in an actual combat zone, you just enter your military W-2 and all the boxes it has. box 1 shown will already be reduced by your combat pay amount (or more if you have other pre-tax deductions), the Combat pay will also be noted in box 12 of the W-2 with a code letter "Q", and that takes care of it. BUT, any other income you have (Interest, dividends, spouse's W-2, investment income) may still be subject to being taxed.
As far a state taxes are concerned, your state won't tax the combat pay either, and some state's won't tax you at all if you are posted out of your HOR/SLR state, while other states will tax all your non-combat income no matter where you are posted....but that's handled during the TTX software interview as long as you go thru it carefully.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
