Mich. Comp. Laws § 123.1355

Sec. 15. Not later than November 7, 2017, and each October 7 thereafter, for each municipality that is a local school district, the department shall do all of the following: (a) Calculate the municipality's personal property exemption loss. (b) Multiply the result of the calculation in subdivision (a) by the individual millage levied under section 1212 of the revised school code, 1976 PA 451, MCL 380.1212, and section 2 of 1917 PA 156, MCL 123.52, as calculated under section 13(5). (c) For calendar year 2017 calculations only, adjust the amount calculated under subdivision (b) by the amount required to reflect changes in prior year taxable values that affect any prior year calculation under this section and that can be calculated from taxable values reported under section 151(1) of the state school aid act of 1979, 1979 PA 94, MCL 388.1751. (d) Subtract from the result of the calculation in subdivision (b), as adjusted by subdivision (c), the amount calculated under section 16a(2) for captured taxes levied by the municipality under section 1212 of the revised school code, 1976 PA 451, MCL 380.1212, and section 2 of 1917 PA 156, MCL 123.52, not including taxes attributable to increased captured value.