40 ILCS 5/11-173
Current through Public Act 103-593
Amounts credited for age and service and prior service annuity shall be improved by interest at the effective rate from the end of the month in which the contributions were due during the time thereafter an employee is in service until his annuity is fixed if a present employee or until attainment of age 65 if a future entrant or a re-entrant.
40 ILCS 5/11-173