Indiana Code Title 6. Taxation § 6-8.1-15-19

Sec. 19. If charges for nontaxable mobile telecommunications service are aggregated with and not separately stated from charges that are subject to taxation, the charges for nontaxable mobile telecommunications service are subject to taxation unless the home service provider can reasonably identify charges not subject to the tax, charge, or fee from its books and records that are kept in the regular course of business.