(40 ILCS 5/13-301) (from Ch. 108 1/2, par. 13-301)
    Sec. 13-301. Retirement annuity; eligibility. Any employee who withdraws from service and meets the age and service requirements and other conditions set forth in subsections (a), (b), (c) or (d) hereof is entitled to receive a retirement annuity.
    (a) Withdrawal on or after age 60. Any employee, upon withdrawal from service on or after attainment of age 60 and having at least 5 years of service, is entitled to a retirement annuity.
    (b) Withdrawal on or after attainment of minimum retirement qualifications and prior to age 60.
        (1) Any employee, upon withdrawal from service on or
    
after attainment of age 55 (age 50 if the employee first entered service before June 13, 1997) but prior to age 60 and having at least 10 years of service, is entitled to a retirement annuity as of the date of withdrawal or, at the option of the employee, at any time thereafter.
        (2) Any employee who withdraws on or after attainment
    
of age 55 (age 50 if the employee first entered service before June 13, 1997) and prior to age 60 having at least 5 years but less than 10 years of service is entitled to a retirement annuity upon attainment of age 62, subject to the other requirements of this Article.
        (3) Any employee who withdraws from service on or
    
after attainment of age 50 but prior to age 60 and is eligible for early retirement without discount under the Rule of 80 as provided in subsection (c) of Section 13-302 is entitled to a retirement annuity at the time of withdrawal.
    (c) Withdrawal prior to minimum retirement age. Any employee, upon withdrawal from service prior to age 55 (age 50 if the employee first entered service before June 13, 1997) and having at least 10 years of service, shall become entitled to a retirement annuity upon attainment of age 55 (age 50 if the employee first entered service before June 13, 1997) or, at the option of the employee, at any time thereafter, subject to the other requirements of this Article.
    (d) Withdrawal while disabled. Any employee having at least 5 years of service who has received ordinary disability benefits on or after January 1, 1986 for the maximum period of time hereinafter prescribed, and who continues to be disabled and withdraws from service, shall be entitled to a retirement annuity. In the case of an employee who enters service after the effective date of this amendatory Act of the 94th General Assembly, the required 5 years of service is exclusive of service credit described in Section 13-313. The age and service conditions as to eligibility for such annuity shall be waived as to the employee, but the early retirement discount under Section 13-302(b) shall apply. If the employee is under age 55 on the date of withdrawal, the retirement annuity shall be computed by assuming that the employee is then age 55 and then reduced to its actuarial equivalent at his attained age on that date according to applicable mortality tables and interest rates. The retirement annuity shall not be payable for any period prior to the employee's attainment of age 55 during which the employee is able to return to gainful employment. Upon the employee's death while in receipt of a retirement annuity, a surviving spouse or minor children shall be entitled to receive a surviving spouse's annuity or child's annuity subject to the conditions hereinafter prescribed in Sections 13-305 through 13-308.
(Source: P.A. 94-621, eff. 8-18-05.)