Mich. Comp. Laws § 38.1670: Tier 2 vesting and contribution requirements.

Sec. 70.

(1) This section is subject to the vesting requirements of section 42b.

(2) Unless the qualified participant affirmatively elects not to contribute or elects to contribute a lesser amount, the qualified participant shall contribute 2% of his or her compensation to his or her Tier 2 account. The qualified participant's employer shall make a contribution to the qualified participant's Tier 2 account in an amount equal to 50% of the first 2% of compensation contribution made by the qualified participant under this subsection.

(3) A qualified participant may make contributions in addition to contributions made under subsection (2) to his or her Tier 2 account as permitted by the department and the internal revenue code.