Sec. 8.05. FUNDING OF BENEFITS. (a) Contributions may not be accumulated under the excess benefit plan to pay future retirement benefits. Instead, each payment of municipal contributions that would otherwise be made to the fund under Section 4.05 of this Act shall be reduced by the amount determined by the board as necessary to meet the requirements for retirement benefits under the excess benefit plan, including reasonable administrative expenses, until the next payment of municipal contributions is expected to be made to the fund. The municipality shall then pay to the excess benefit plan out of the withheld contributions, not earlier than the 14th day before the date of each distribution of monthly retirement benefits is required to be made from the excess benefit plan, the amount necessary to satisfy the obligation to pay monthly retirement benefits from the excess benefit plan. The board shall satisfy the obligation of the excess benefit plan to pay retirement benefits out of the municipal contributions transferred for that month.

(b) Municipal contributions otherwise required to be made to the fund under Section 4.05 of this Act and any other qualified plan shall be divided into contributions required to pay retirement benefits under this article and contributions paid into and accumulated to pay the maximum benefits required under the qualified plan. Municipal contributions made to provide retirement benefits under this article may not be commingled with the money of the fund or any other qualified plan.