Mich. Comp. Laws § 111.8

Sec. 8. On or before the first Monday of October in each year, the city clerk shall certify to the county clerk of the county in which the city is located the aggregate amount of all sums which the council require to be raised for the next fiscal year for all city purposes, or where the council have decided to have the taxes paid in 2 installments, all sums for city purposes that have not been paid upon the July rolls, and for schools and library and school-house purposes, by general taxation upon all the taxable property of the whole city.