40 ILCS 5/8-214
Amounts deducted from employee's salaries for age and service annuity and widow's annuity, or otherwise contributed by employees, amounts contributed by the city for such annuities for an employee receiving duty disability benefit, the assets of the public school employees' pension fund superseded by this fund on July 1, 1923, which were transferred to this reserve, and amounts transferred to this reserve from the investment and interest reserve, shall be credited to this reserve.
An individual account shall be kept in this reserve for each employee to which such salary deductions, interest, and contributions shall be credited. At least once each year, and before any transfer shall be made from this reserve to any other reserve the sums credited in this reserve shall be improved by interest.
When the annuity for any employee or his widow is fixed or granted, the amount in this reserve for such annuities shall be transferred to the annuity payment reserve.
There shall be charged to this reserve amounts refunded as provided in this Article, except refunds under Section 8-215.
40 ILCS 5/8-214