I am a resident of IL and several years ago I started to work for MA based company. The employer paid my taxes in MA (box 15 W2). I used to file tax returns both in IL as a resident and in MA as a non resident. But last year my employer changed my status to IL based employee who works remotely, and my state taxes were paid to IL (box 15 W2).
Do I still need to file tax returns in both states as before? Or, I can file only one for IL?
