Indiana Code Title 6. Taxation § 6-2.5-3.5-21

Sec. 21. (a) Except as provided in subsection (b), a distributor that pays the gasoline use tax under this chapter shall separately state the amount of tax paid on the invoice the distributor issues to its purchaser or recipient.  The purchaser or recipient shall pay to the distributor an amount equal to the gasoline use tax paid.

(b) A distributor that:

may not require the exempt purchaser to pay the gasoline use taxes paid on the gasoline sold to the exempt purchaser.  A distributor that has paid gasoline use taxes and has not been reimbursed because the gasoline is sold to an exempt purchaser may file a claim for a refund.  A claim for a refund must be on the form approved by the department and must include all supporting documentation reasonably required by the department.  If a distributor files a completed refund claim form that includes all supporting documentation, the department shall authorize the state comptroller to issue a warrant for the refund.