40 ILCS 5/11-134
An employee who withdraws after July 1, 1957 and before January 1, 1988, with 20 or more years of service, before age 60, shall be entitled to an annuity, to begin not earlier than age 55, if under such age at withdrawal, as computed in the last preceding paragraph, reduced 0.25% if the employee was born before January 1, 1936, or 0.5% if the employee was born on or after January 1, 1936, for each full month or fractional part thereof that his attained age when such annuity is to begin is less than 60.
Any employee born before January 1, 1936 who withdraws with 20 or more years of service, and any employee with 20 or more years of service who withdraws on or after January 1, 1988, may elect to receive, in lieu of any other employee annuity provided in this Section, an annuity for life equal to 1.80% for each of the first 10 years of service, 2.00% for each of the next 10 years of service, 2.20% for each year of service in excess of 20, but not exceeding 30, and 2.40% for each year of service in excess of 30, of the highest average annual salary for any 4 consecutive years within the last 10 years of service immediately preceding the date of withdrawal, to begin not earlier than upon attained age of 55 years, if under such age at withdrawal, reduced 0.25% for each full month or fractional part thereof that his attained age when annuity is to begin is less than 60; except that an employee retiring on or after January 1, 1988, at age 55 or over but less than age 60, having at least 35 years of service, or an employee retiring on or after July 1, 1990, at age 55 or over but less than age 60, having at least 30 years of service, or an employee retiring on or after the effective date of this amendatory Act of 1997, at age 55 or over but less than age 60, having at least 25 years of service, shall not be subject to the reduction in retirement annuity because of retirement below age 60.
However, in the case of an employee who retired on or after January 1, 1985 but before January 1, 1988, at age 55 or older and with at least 35 years of service, and who was subject under this subsection (a) to the reduction in retirement annuity because of retirement below age 60, that reduction shall cease to be effective January 1, 1991, and the retirement annuity shall be recalculated accordingly.
Any employee who withdraws on or after July 1, 1990, with 20 or more years of service, may elect to receive, in lieu of any other employee annuity provided in this Section, an annuity for life equal to 2.20% for each year of service if withdrawal is before January 1, 2002, or 2.40% for each year of service if withdrawal is on or after January 1, 2002, of the highest average annual salary for any 4 consecutive years within the last 10 years of service immediately preceding the date of withdrawal, to begin not earlier than upon attained age of 55 years, if under such age at withdrawal, reduced 0.25% for each full month or fractional part thereof that his attained age when annuity is to begin is less than 60; except that an employee retiring at age 55 or over but less than age 60, having at least 30 years of service, shall not be subject to the reduction in retirement annuity because of retirement below age 60.
Any employee who withdraws on or after the effective date of this amendatory Act of 1997 with 20 or more years of service may elect to receive, in lieu of any other employee annuity provided in this Section, an annuity for life equal to 2.20% for each year of service if withdrawal is before January 1, 2002, or 2.40% for each year of service if withdrawal is on or after January 1, 2002, of the highest average annual salary for any 4 consecutive years within the last 10 years of service immediately preceding the date of withdrawal, to begin not earlier than upon attainment of age 55 (age 50 if the employee has at least 30 years of service), reduced 0.25% for each full month or remaining fractional part thereof that the employee's attained age when annuity is to begin is less than 60; except that an employee retiring at age 50 or over with at least 30 years of service or at age 55 or over with at least 25 years of service shall not be subject to the reduction in retirement annuity because of retirement below age 60.
The maximum annuity payable under this paragraph (a) of this Section shall not exceed 70% of highest average annual salary in the case of an employee who withdraws prior to July 1, 1971, 75% if withdrawal takes place on or after July 1, 1971 and prior to January 1, 2002, or 80% if withdrawal is on or after January 1, 2002. For the purpose of the minimum annuity provided in said paragraphs $1,500 shall be considered the minimum annual salary for any year; and the maximum annual salary to be considered for the computation of such annuity shall be $4,800 for any year prior to 1953, $6,000 for the years 1953 to 1956, inclusive, and the actual annual salary, as salary is defined in this Article, for any year thereafter.
Such amount as he could have received had the accumulated amounts for annuity been improved with interest at the effective rate to the date of his withdrawal, or to attainment of age 70, whichever is earlier, and had the city contributed to such earlier date for age and service annuity the amount that would have been contributed had he been under age 65, after the date his annuity was fixed in accordance with this Article, and assuming his annuity were computed from such accumulations as of his age on such earlier date. The annuity so computed shall not exceed the annuity which would be payable under the other provisions of this Section if the employee was credited with 20 years of service and would qualify for annuity thereunder.
The increases granted under items (1), (2) and (3) of this subsection (j) shall not be limited by any other Section of this Act.
40 ILCS 5/11-134