Yes, based on your facts, continue to enter your resident state as Michigan, and yes, you need to file a MI tax return. To follow-up on the comments from @ColeenD3, in connection with completing your tax return, you can state that you did not live in any other state during 2021. MI defines a resident as follows:
- (1) "Resident" means:,
- (a) An individual domiciled in the state. "Domicile" means a place where a person has his true, fixed and permanent home and principal establishment to which, whenever absent therefrom he intends to return, and domicile continues until another permanent establishment is established. (underline and bold added).
Michigan Legislature
It does not appear from what you stated in your post that you intended to make SC your new domicile and moreover, it appears that you intended always to return to MI. Thus, MI continues to be your resident state, and you do not need to file a SC return.
@tsavant1