Section 40 ILCS 5/17-156.3 - Minimum retirement pension(a) Beginning January 1, 1987, any person who is receiving a monthly retirement pension under this Article which, after inclusion of (1) all one-time and automatic annual increases to which the person is entitled, (2) any supplementary payment payable under Section 17-154, and (3) any amount deducted under Section 17-120 to provide a reversionary pension, is less than the minimum monthly retirement benefit amount specified in subsection (b) of this Section, shall be entitled to a monthly supplemental payment equal to the difference.(b) Beginning January 1, 1996, for purposes of the calculation in subsection (a), the minimum monthly retirement benefit amount is the sum of $25 for each year of service, up to a maximum of $750 per month for 30 or more years of creditable service.(c) The changes made to this Section by this amendatory Act of 1995 apply to all persons receiving a retirement pension under this Article, without regard to whether or not employment terminated prior to the effective date of this amendatory Act of 1995 and notwithstanding Section 17-157.P.A. 89-21, eff. 6/6/1995; 89-25, eff. 6/21/1995.