Mich. Comp. Laws § 110.15: Improvements prohibited unless appropriation made; expenditures only from appropriations.

Sec. 15.

No improvement, work, repairs or expense, to be paid for out of any general fund, or street district fund, excepting as herein otherwise provided, shall be ordered, commenced or contracted for, or incurred in any fiscal year, unless in pursuance of an appropriation specially made therefor, in the last preceding annual appropriation bill, nor shall any expenditure be made, or liability be incurred, in any such year, for any such work, improvement, repairs, or for any purpose, exceeding the appropriation so made therefor; nor shall any expenditure be made, or money be paid out of any general, or street district fund, for any purpose, unless appropriated for that purpose in said bill.