Mich. Comp. Laws § 211.215

Sec. 15. In each year, on the third Monday of May, the board shall make a preliminary order approving a maximum tax rate for the purposes of each local unit and shall give written notice of such order to each local unit. At the same time the board shall give to each local unit written notice of the time and place for final hearing before the board on the maximum tax rate of such local unit, which shall not be less than 8 nor more than 12 days thereafter. At such final hearing any local unit may object by its duly authorized officers or agents to the maximum tax rate as ordered by the board and request a redetermination thereof.