Indiana Code Title 6. Taxation § 6-6-6.5-19

Sec. 19.  (a) The registration of any taxable aircraft without payment of the tax imposed by this chapter shall be void, and the department shall take possession of the certificate of registration and other evidences of registration, until the owner shall have paid the tax together with any penalties assessed by the department.

(b) If an owner does not register his aircraft and pay the tax imposed by this chapter when required, the owner is subject to a penalty and interest on the unpaid tax.  The penalty is the greater of twenty dollars ($20) or twenty percent (20%) of the unpaid tax.  The interest applies at the rate established in IC 6-8.1-10-1.  The penalty and interest apply from the date the tax becomes delinquent until the aircraft is registered and the tax paid.

(c) If an airport owner does not report the aircraft based at his airport when required by section 23 of this chapter, the department may assess a penalty equal to ten dollars ($10) for each day that the report is late.

(d) If an owner does not register the owner's aircraft and pay the gross retail or use tax when required by this chapter, the owner shall be subject to the penalties and interest on the unpaid gross retail or use tax that are established in IC 6-8.1-10.