Indiana Code Title 6. Taxation § 6-6-6.5-15

Sec. 15. (a) If a taxable aircraft becomes subject to registration or taxation after the regular annual registration date in a year, the tax imposed by this chapter shall become due and payable at the time the aircraft becomes subject to registration and the amount of tax to be paid by the owner for the remainder of the year shall be reduced by the lesser of (1) ninety percent (90%) of the tax or (2) ten percent (10%) of the tax for each full calendar month which has elapsed since the regular annual registration date in that year.

(b) The tax reduction under this section shall not apply to persons who claim a tax credit under section 13(c) of this chapter.