Indiana Code Title 5. State and Local Administration § 5-10.4-6-3

Sec. 3. (a) After July 9, 1951, a member receiving or entitled to receive a retirement benefit that accrued before July 11, 1951, under Acts 1915, c.182, or any statute amendatory of or supplemental to Acts 1915, c.182 enacted before January 1, 1951, is eligible to receive an increase in benefit.  This benefit must be, when adjusted by the board to Acts 1951, c.142, s.2 (j), the equivalent of the retirement benefit for which the member would be eligible if the teacher had retired as a member of the fund under Acts 1951, c.142 with the beginning age, years of teaching and equivalent service, and payments made by the member at retirement.

(b) A member who has completed at least twenty (20) years of service is eligible to receive a retirement benefit from state sources of not less than four hundred twenty dollars ($420) a year.

(c) There is appropriated annually to the fund from the state general fund, in addition to other appropriations for the fund, an amount sufficient to pay the retirement benefits specified in this section.