Mich. Comp. Laws § 18.1350d

Sec. 350d. (1) The procedures enumerated in this section shall be followed when revenues are required to be refunded pursuant to section 26 of article IX of the state constitution of 1963. (2) For any fiscal year in which total state revenues exceed the revenue limit as provided in section 26 of article IX of the state constitution of 1963 by 1% or more, the revenues in excess of the revenue limit shall be refunded in accordance with 1941 PA 122, MCL 205.1 to 205.31, for the taxpayer's tax year beginning in the fiscal year for which it is determined that the revenue limit has been exceeded. (3) A refund shall not be required if total state revenues exceed the revenue limit by less than 1%. (4) If total state revenues exceed the revenue limit by less than 1%, the governor shall recommend to the legislature that the excess be appropriated to the countercyclical budget and economic stabilization fund, or its successor. (5) A refund required pursuant to this section shall be refunded during the fiscal year beginning on the October 1 following the filing of the report required by section 350e which determines that the limit was exceeded in the prior fiscal year for which the report was filed.