Ind. Code § 2-3.5-4-4
(a) A participant who is at least fifty-five (55) years of age is entitled, for the remainder of the participant's life, to a reduced monthly retirement benefit computed under subsection (b), beginning on the date specified by the participant in a written application, if all of the following conditions are met on the date on which the benefit begins:
(b) The reduced monthly benefit payable for life to a participant eligible under this section is the benefit calculated under section 3 of this chapter, multiplied by a percentage determined as follows:
(B) If the remainder (X) is greater than sixty (60), multiply five-twelfths percent (5/12%) times the difference obtained by subtracting sixty (60) from the remainder (X) and obtain a product. Add to this six percent (6%) and obtain a sum (Y).
STEP THREE: From one hundred percent (100%) subtract the appropriate (Y). This equals the percentage used to determine the reduced monthly benefit.
STEP ONE: From seven hundred eighty (780) months, which equals sixty-five (65) years, subtract the age of the participant at the participant's retirement date expressed in whole months (retirement age in months) and obtain a remainder (X).
STEP TWO:
As added by P.L.6-1989, SEC.1. Amended by P.L.13-2001, SEC.2.