Ind. Code § 6-4.1-4-1
(b) The person filing the return shall file it under oath on the forms prescribed by the department of state revenue. The return shall:
(c) If the decedent died testate, the person filing the return shall attach a copy of the decedent's will to the return.
As added by Acts 1976, P.L.18, SEC.1. Amended by Acts 1977(ss), P.L.6, SEC.5; Acts 1980, P.L.57, SEC.9; P.L.67-1988, SEC.1; P.L.252-2001, SEC.2; P.L.6-2010, SEC.2; P.L.190-2016, SEC.2; P.L.79-2017, SEC.17.