40 ILCS 5/18-125.1
A participant who retires from service after June 30, 1969, shall, in January of the year next following the year in which the first anniversary of retirement occurs, and in January of each year thereafter, have the amount of his or her originally granted retirement annuity increased as follows: for each year up to and including 1971, 1 1/2%; for each year from 1972 through 1979 inclusive, 2%; and for 1980 and each year thereafter, 3%.
Notwithstanding any other provision of this Article, a retirement annuity for a participant who first serves as a judge on or after January 1, 2011 (the effective date of Public Act 96-889) shall be increased in January of the year next following the year in which the first anniversary of retirement occurs, but in no event prior to age 67, and in January of each year thereafter, by an amount equal to 3% or the annual percentage increase in the consumer price index-u as determined by the Public Pension Division of the Department of Insurance under subsection (b-5) of Section 18-125 , whichever is less, of the retirement annuity then being paid.
This Section is not applicable to a participant who retires before he or she has made contributions at the rate prescribed in Section 18-133 for automatic increases for not less than the equivalent of one full year, unless such a participant arranges to pay the system the amount required to bring the total contributions for the automatic increase to the equivalent of one year's contribution based upon his or her last year's salary.
This Section is applicable to all participants in service after June 30, 1969 unless a participant has elected, prior to September 1, 1969, in a written direction filed with the board not to be subject to the provisions of this Section. Any participant in service on or after July 1, 1992 shall have the option of electing prior to April 1, 1993, in a written direction filed with the board, to be covered by the provisions of the 1969 amendatory Act. Such participant shall be required to make the aforesaid additional contributions with compound interest at 4% per annum.
Any participant who has become eligible to receive the maximum rate of annuity and who resumes service as a judge after receiving a retirement annuity under this Article shall have the amount of his or her retirement annuity increased by 3% of the originally granted annuity amount for each year of such resumed service, beginning in January of the year next following the date of such resumed service, upon subsequent termination of such resumed service.
Beginning January 1, 1990, all automatic annual increases payable under this Section shall be calculated as a percentage of the total annuity payable at the time of the increase, including previous increases granted under this Article.
40 ILCS 5/18-125.1