Beginning July 1, 1987, the minimum retirement pension payable to a firefighter with 20 or more years of creditable service, the minimum disability pension payable under Section 4-110 or 4-111, and the minimum surviving spouse's pension shall be $400 per month, without regard to whether the death, retirement or disability of the firefighter occurred prior to that date.
Beginning July 1, 1993, the minimum retirement pension payable to a firefighter with 20 or more years of creditable service and the minimum surviving spouse's pension shall be $475 per month, without regard to whether the firefighter was in service on or after the effective date of this amendatory Act of 1993.
In the case of a pensioner whose pension began before the effective date of this amendatory Act and is subject to increase under this subsection (b), the pensioner shall be entitled to a lump sum payment of the amount of that increase accruing from January 1, 1999 (or the date the pension began, if later) to the effective date of this amendatory Act.
40 ILCS 5/4-109.2