Ind. Code § 5-10.1-6-4
(c) Employees who are entitled to back coverage under the federal-state agreement shall make contributions for the back coverage. The employee may have the contribution deducted from his compensation or from the amount credited to his annuity savings account if he is a member of the public employees' retirement fund.
As added by Acts 1977, P.L.53, SEC.1. Amended by P.L.57-1987, SEC.3.