Hello, I am a resident for tax purposes, and this year I started my PhD program. I received the W-2 form, but along with it, I also received the 1042-S. The income code is 20, the exemption code in box 3a is 04, and in box 4a, it's 16. How do I report it in my tax return properly? Could you please explain it step-by-step, as I am already very confused by the process... If that is important, I am from Poland, and to my best knowledge Poland and the US have a tax treaty. I appreciate any help you can provide.
