Mich. Comp. Laws § 110.13
All sums ordered in the annual appropriation bill, in any year to be raised for the several general funds (except in cases where the council have decided to have the taxes levied and collected in 2 installments, in which case such sums shall, by the board of review and equalization provided in section 5 of chapter 30, be apportioned on or before the fifteenth day of May, among the several wards of the city according to their assessed valuation) and all amounts reported to the council by the board of education to be raised for schools, library and schoolhouse purposes, as provided in chapter 32 of this act, shall be certified to the clerk of the board of supervisors of the county on or before the first Monday of October. All sums ordered in said bill to be levied or [re-assessed] assessed in street or sewer districts or as special assessments, and in case there is to be a July tax roll for the collection of city taxes, all sums ordered in the annual appropriation bill apportioned as aforesaid, shall, forthwith, be certified by the city clerk to the supervisors of the respective wards as provided in chapter 24, and all such sums shall be levied and collected on such July or city tax roll. If, however, there be no July or city tax or if any part of the taxes assessed and levied on the July roll are not paid, such sums shall be levied and collected with the state and county taxes next thereafter to be levied within such city.
MCL 110.13