You're a Michigan resident if Michigan is your permanent home. Your permanent home is the place you intend to return to whenever you go away. A temporary absence from Michigan, such as spending the winter in a southern state, doesn't make you a part-year resident.
Who is considered a Michigan part-year resident?
You're a part-year resident if, during the year, you move your permanent home into or out of Michigan. You must pay Michigan income tax on income you earned, received, or accrued while living in Michigan.
Who is considered a Michigan nonresident?
Michigan nonresidents didn't live in Michigan during the year, but they had income from a Michigan source.
Note: Out-of-state students who live in Michigan while they are attending school are not considered Michigan residents or part-year residents and should file as nonresidents.