Ind. Code § 6-2.5-9-4
A person who:
(3) offers to refund part of a customer's state gross retail or use tax as a part of a sale;
commits a Class B infraction.
As added by Acts 1980, P.L.52, SEC.1. Amended by P.L.81-1983, SEC.7; P.L.218-2017, SEC.10.