Mich. Comp. Laws § 141.1003

Sec. 3. A city or county that meets the applicable conditions described in section 4 may borrow money and issue its bonds or obligations either for funding an operating deficit for a past fiscal year or years or for funding a projected operating deficit in the current fiscal year, or for funding both. The bonds or obligations may be issued as general obligation bonds or obligations, as bonds or obligations payable solely from a specified source or sources of revenues lawfully available to the city or county, or as a combination of general obligation bonds or obligations and bonds or obligations payable from a specified source or sources of revenues. The authority granted by this act is in addition to any power granted to a city or county by its charter or any other provision of law.