Indiana Code Title 6. Taxation § 6-3.5-4-6

Sec. 6. (a) If an adopting entity adopts an ordinance to impose, rescind, or change the rate or amount of the surtax, the adopting entity shall send a copy of the ordinance, and, if applicable, a copy of the letter from the Indiana department of transportation approving the adopting entity's transportation asset management plan, to the bureau of motor vehicles on or before September 1, to be effective January 1 of the following calendar year.

(b) An adopting entity shall submit all copies under subsection (a) in a manner prescribed by the bureau of motor vehicles.