(40 ILCS 5/12-133.1) (from Ch. 108 1/2, par. 12-133.1)
    Sec. 12-133.1. Annual increase in basic retirement annuity.
    (a) Any employee upon withdrawal from service on or after July 1, 1965, and retiring on a retirement annuity, shall be entitled to an annual increase in his basic retirement annuity as defined herein while he is in receipt of such annuity.
    The term "basic retirement annuity" shall mean the retirement annuity of the amount fixed and payable at date of retirement of the employee.
    (b) The annual increase in annuity shall be 1 1/2% of the basic retirement annuity. The increase shall first occur in the month of January or the month of July, whichever first occurs next following or coincidental with the first anniversary of retirement. Effective January 1, 1972, the annual rate of increase in annuity thereafter shall be 2% of the basic retirement annuity, provided that beginning as of January 1, 1976, the annual rate of increase shall be 3% of the basic retirement annuity.
    (c) For an employee who retires with less than 30 years of service, the increase in the basic retirement annuity shall begin not earlier than in the month of January or the month of July, whichever occurs first, following or coincidental with the employee's attainment of age 60.
    For an employee who retires with at least 30 years of service, the annual increase under this Section shall begin in the month of January or the month of July, whichever first occurs next following or coincidental with the later of (1) the first anniversary of retirement or (2) July 1, 1998, without regard to the attainment of age 60 and without regard to whether or not the employee was in service on or after the effective date of this amendatory Act of 1998.
    (d) The increase in the basic retirement annuity shall not be applicable unless the employee otherwise qualified has made contributions to the fund as provided herein for an equivalent period of one full year. If such contributions were not made, the employee may make the required payment to the fund at the time of retirement, in a single sum, without interest.
    (e) The additional contributions by an employee towards the annual increase in basic retirement annuity shall not be refundable, except to an employee who withdraws and applies for a refund under this Article, or dies while in service, and also in cases where a temporary annuity becomes payable. In such cases his contributions shall be refunded without interest.
(Source: P.A. 102-263, eff. 8-6-21.)