Summer Internship income
I did a paid internship in WA in 2019. I stayed there for 3 months with a signed lease to my name.
After completing the internship, I came back to Wisconsin to finish up my studies. I have signed the company's offer letter to join them back as FTE after finishing up my studies in Feb 2020.
Do I have to file a resident tax return in Wisconsin on my internship income?
P.S. I am an international student and I don't possess any state Id yet.