Mich. Comp. Laws § 38.1642b: Qualified participant; Tier 1 and Tier 2 vesting schedule.

Sec. 42b.

(1) A qualified participant is immediately 100% vested in his or her contributions made to Tier 2.

(2) A qualified participant who is a member of Tier 1 vests in the employer contributions made on his or her behalf to Tier 2 according to the following schedule:

(a) On completion of 2 years of service, 50%.

(b) On completion of 3 years of service, 75%.

(c) On completion of 4 years of service, 100%.