Section 40 ILCS 5/20-106 - [Text of Section WITHOUT the changes made by P.A. 98-599, which has been held unconstitutional] Final average salary(a) "Final average salary": The average (or other) salary which is considered by a participating system in determining the amount of the retirement annuity or survivor's annuity.(b) Earnings credits under all participating systems shall be considered by each system in determining final average salary. In calculating a proportional retirement or survivor's annuity based on these earnings credits, the participating system shall apply any limitations on earnings for annuity purposes that are imposed by the Article governing the system.P.A. 88-593, eff. 8/22/1994.This section is set out more than once due to postponed, multiple, or conflicting amendments.