Indiana Code Title 5. State and Local Administration § 5-10.2-5-30

Sec. 30. (a) In addition to any other cost of living provided under this chapter, the pension portion (plus postretirement increases to the pension portion) provided by employer contributions of the monthly benefit payable after June 30, 2000, to a member of the public employees' retirement fund or the Indiana state teachers' retirement fund (or to a survivor or beneficiary of a member of the public employees' retirement fund or the Indiana state teachers' retirement fund) who retired or was disabled before July 2, 1975, shall be increased by the amount necessary to ensure that the purchasing power (as determined by the PERF or TRF board (as those boards existed before their dissolution on July 1, 2011), based on changes in the consumer price index and postretirement increases to the pension portion) of the member's pension portion is at least equal to fifty-seven and four-tenths percent (57.4%) of the purchasing power of the member's pension portion at the time the member retired, as determined on July 1, 2000.

(b) The increases specified in this section: