Michigan Compiled Laws, Chapter 38. Civil Service and Retirement § 38.1104

(a) The member has 30 months or more of credited service in force acquired in the employ of the preceding reciprocal unit.

(b) Beginning September 1, 2006, the member does not withdraw his or her accumulated deposits from the preceding reciprocal unit's retirement system, or if the member has withdrawn the accumulated deposits, the member deposits with the preceding reciprocal unit the amount withdrawn together with interest compounded annually at the rate in effect for the preceding reciprocal unit; the deposit to be made within 20 years after the date the member becomes employed by the succeeding governmental unit.

(c) Beginning September 1, 2006, the member enters the employ of each succeeding governmental unit within 20 years after the date of leaving the employ of each preceding governmental unit.

(d) The member's credited service in force with the preceding reciprocal retirement systems plus the member's credited service acquired in the employ of succeeding governmental units equals or exceeds the minimum credited service required for age and service retirement in the applicable preceding reciprocal retirement system.

(e) The retirement allowance payable by any preceding reciprocal retirement system shall be determined at the time the member ceased to be a member of the preceding reciprocal retirement system, upon the basis of the retirement allowance formula of the preceding reciprocal retirement system, the member's credited service in force in the preceding reciprocal retirement system, and the member's final average salary at that time.

(f) Payment of a retirement allowance by a preceding reciprocal retirement system shall begin on the first day of the second calendar month immediately following the month in which proper written application is filed with the governing body of the preceding reciprocal retirement system on or after attainment of 60 years of age. The retirement allowance shall not begin before attainment of the minimum age for age and service retirement required in the preceding reciprocal retirement system.