I have a refund coming from Michigan and city of Detroit. Since it is the same "Refund file" address; "Michigan Dept of Treasury Lansing, MI 48956", do I send both 1040 iand is the additional Form 5119?
Yes, send both the MI-1040 and the City of Detroit (Form 5119) return to the same address. As part of a partnership to help Detroit to run more efficiently, the Michigan Department of Treasury processes returns for the City of Detroit.