Sec. 4.02. FAMILY AND MEDICAL LEAVE. (a) If a member takes unpaid leave as provided by the Family and Medical Leave Act (29 U.S.C. Section 2601 et seq.), that member is entitled to make voluntary contributions for the leave period in the same amount as the member would have paid if the member had not taken the leave. Those payments must be made not later than the 30th day after the date the member returns from that leave. A computation of contributions under this section shall be made in the same manner as other computations under this Act. A municipality to which this Act applies shall match an amount equal to twice the amount of each payment a member makes to the fund under this subsection.

(b) If the member does not comply with Subsection (a) of this section, the member loses all credit toward the member's retirement annuity for the period the member was on leave.