Ind. Code § 6-9-65-6

Sec. 6. A tax imposed under this chapter shall be imposed, paid, and collected in the same manner that the state gross retail tax is imposed, paid, and collected under IC 6-2.5. However, the return to be filed with the payment of the tax imposed under this chapter may be made on a separate return or may be combined with the return filed for the payment of the state gross retail tax, as prescribed by the department of state revenue.