Michigan Student worked in IL for the summer, w/h issue

[taxbrewster]

Just double checking here. I want to know if I am correct in my thought process.

T/P attended U of M in spring, worked as a consultant for the summer in Illinois, then returned to Mi for the next semester of grad school . The company withheld taxes in IL and Mi as T/P is still employed with consulting company during the rest of the school year. I know there is a reciprocal agreement with MI and IL - so is the Non-Res IL the play and state all income was earned while a resident of MI and should not had any withholding, then have MI tax all income and use the IL refund to pay the state of MI or is this something that needs to be handled by the HR/payroll company? I don't see a Part Year Res coming into play since the intension was to return to MI...This should have been handled when T/P filled out w9 form, correct?

Thanks...

Just updated to 12 seems like things are running a bit better....but the jury is still out.