Indiana Code Title 6. Taxation § 6-6-6.5-4

Sec. 4. The department shall file each application received and, upon determining that the aircraft is required to be registered, shall issue to the owner a certificate of registration together with such other evidence of registration as may be carried or affixed in or on the aircraft as the department may require.  If for any reason such aircraft is not required to be registered, the department shall notify the owner within fifteen (15) days of that fact, together with the reasons therefor.