Michigan Compiled Laws, Chapter 552. Divorce § 552.18

Sec. 18. (1) Any rights in and to vested pension, annuity, or retirement benefits, or accumulated contributions in any pension, annuity, or retirement system, payable to or on behalf of a party on account of service credit accrued by the party during marriage shall be considered part of the marital estate subject to award by the court under this chapter.

(2) Any rights or contingent rights in and to unvested pension, annuity, or retirement benefits payable to or on behalf of a party on account of service credit accrued by the party during marriage may be considered part of the marital estate subject to award by the court under this chapter where just and equitable.

(3) Upon motion of a party or upon consent of the parties, an order of the court under this section entered before the effective date of the amendatory act that added this subsection  1 shall be amended to satisfy the requirements of an eligible domestic relations order and to effectuate the intent of the parties or the ruling of the court. As used in this subsection, “eligible domestic relations order” means a domestic relations order that is an eligible domestic relations order under the eligible domestic relations order act. 2