The contribution for postretirement service between July 1, 1985, and July 1, 1991, for which the reemployed retiree contribution was paid, shall be the difference between such contribution and the total applicable contribution for the period being claimed, plus interest. The employer of such member may pay the applicable employer contribution in lieu of the member. If a member does not wish to claim credit for all of the postretirement service for which he or she is eligible, the service the member claims must be the most recent service.
Fla. Stat. § 121.122