Mich. Comp. Laws § 110.10

Sec. 10. It shall be the duty of the council to cause estimates to be made in the month of September, or in the month of May in each year, where the council has decided to have the taxes levied and collected in 2 installments as authorized in section 2 of chapter 30 of this act, of all the expenditures which will be required to be made from the several general funds of the city during the next fiscal year, for the payment of interest and debts to fall due, or for lands to be acquired, buildings to be erected or repaired, bridges to be built and for the paving of streets, the construction of sewers, making improvements, and for the support of the police and fire departments, and for defraying the current expenses of the year, and for every other purpose for which any money will be required to be paid from any of the several general funds during such fiscal year; and also, to estimate the amounts that will be required to be expended from street district funds during said next fiscal year, in working upon, improving and repairing the streets in the several street districts of the city.