Michigan Compiled Laws, Chapter 388. Schools and School Aid § 388.1613

Sec. 13.  Except as otherwise provided in this act, the apportionments and limitations of the apportionments made under this act shall be made on the membership and number of teachers and other professionals approved by the superintendent employed as of the pupil membership count day of each year and on the taxable value and the operating millage of each district for the calendar year.  In addition, a district maintaining school during the entire year, as provided in section 1561 of the revised school code, MCL 380.1561, shall count memberships and educational personnel pursuant to rules promulgated by the superintendent and shall report to the center as required by state and federal law.