"So PA does not require me to pay taxes a on the out of state income."
Not so. If PA is your state of residence it can tax all your income, regardless of where you earn it.
Additionally, MT can tax income you earn from work you perform in Montana.
You'll be able to claim a credit on your PA tax return for the taxes paid to MT, so you won't be double-taxed.
Are MT and/or PA taxes being withheld from your pay?
**Answers are correct to the best of my ability but do not constitute tax or legal advice.
