40 ILCS 5/2-119.01: Retirement annuities - Amount.

(a) For a participant in service after June 30, 1977 who has not made contributions to this System after January 1, 1982, the annual retirement annuity is 3% for each of the first 8 years of service, plus 4% for each of the next 4 years of service, plus 5% for each year of service in excess of 12 years, based on the participant's highest salary for annuity purposes. The maximum retirement annuity payable shall be 80% of the participant's highest salary for annuity purposes.

(b) For a participant in service after June 30, 1977 who has made contributions to this System on or after January 1, 1982, the annual retirement annuity is 3% for each of the first 4 years of service, plus 3 1/2% for each of the next 2 years of service, plus 4% for each of the next 2 years of service, plus 4 1/2% for each of the next 4 years of service, plus 5% for each year of service in excess of 12 years, of the participant's highest salary for annuity purposes. The maximum retirement annuity payable shall be 85% of the participant's highest salary for annuity purposes.

(c) Notwithstanding any other provision of this Article, for a participant who first becomes a participant on or after January 1, 2011 (the effective date of Public Act 96-889), the annual retirement annuity is 3% of the participant's highest salary for annuity purposes for each year of service. The maximum retirement annuity payable shall be 60% of the participant's highest salary for annuity purposes.

(d) Notwithstanding any other provision of this Article, for a participant who first becomes a participant on or after January 1, 2011 (the effective date of Public Act 96-889) and who is retiring after attaining age 62 with at least 8 years of service credit, the retirement annuity shall be reduced by one-half of 1% for each month that the member's age is under age 67.