Your resident state of MA can tax ALL your income, regardless of where you earn it.
The state in which you work can tax you as a non-resident on the income you earn from work you do within its borders.
So if all your W-2 income was earned from a single employer in another state, it's entirely possible that your W-2 would show the same income for both states.
But you can take a credit on your MA return for income tax you pay to the non-resident state, so you won't be double-taxed.
Post back if this doesn't answer your question.
**Answers are correct to the best of my ability but do not constitute tax or legal advice.
