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40 ILCS 5/15-134.1

    (40 ILCS 5/15-134.1) (from Ch. 108 1/2, par. 15-134.1)
    Sec. 15-134.1. Service calculation and adjustment.
    (a) In computing service, the following schedule shall govern: one month of service means a calendar month during which a participant (i) qualifies as an employee under Section 15-107 for at least 15 or more days, and (ii) receives any earnings as an employee; 8 or more months of service during an academic year shall constitute a year of service; 6 or more but less than 8 months of service during an academic year shall constitute 3/4 of a year of service; 3 or more but less than 6 months of service during an academic year shall constitute 1/2 of a year of service; and one or more but less than 3 months of service during an academic year shall constitute 1/4 of a year of service. No more than one year of service may be granted per academic year, regardless of the number of hours or percentage of time worked.
    (b) In calculating a retirement annuity, if a participant has been employed at 1/2 time or less for 3 or more years after September 1, 1959, service shall be granted for such employment in excess of 3 years, in the proportion that the percentage of time employed for each such year of employment bears to the average annual percentage of time employed during the period on which the final rate of earnings is based. This adjustment shall not be made, however, in determining the eligibility for a retirement annuity, disability benefits, additional death benefits, or survivors' insurance. The percentage of time employed shall be as reported by the employer.
(Source: P.A. 87-8.)