Indiana Code Title 5. State and Local Administration § 5-10.3-8-12

Sec. 12. (a) The board may stop a member's, survivor's, or beneficiary's benefit if any of the following occur:

(b) Except as provided in subsection (c), if an overpayment under this section occurs, the board may not require a member, survivor, or beneficiary to pay more than twenty-five percent (25%) of their monthly benefit toward the overpayment.

(c) If the overpayment described in subsection (a):

the board may only require a member, survivor, or beneficiary to pay the amount of the overpayment of benefits received during the six (6) years before the date that the Indiana public retirement system discovers the overpayment and attempts to notify the member, survivor, or beneficiary of the overpayment. If an overpayment subject to this subsection occurs, the board may not require a member, survivor, or beneficiary to pay more than ten percent (10%) of their monthly benefit toward the overpayment. The board may not use any method to collect an overpayment of benefits under this subsection other than those specified in this section.