Ind. Code § 6-1.1-34-1

Sec. 1. In the year after a reassessment cycle of real property under a county's reassessment plan prepared under IC 6-1.1-4-4.2 is completed the department of local government finance shall compute a new assessment ratio for each school corporation located in a county in which a supplemental county levy is imposed under IC 20-45-7 or IC 20-45-8. In all other years, the department shall compute a new assessment ratio for such a school corporation if the department finds that there has been sufficient reassessment or adjustment of one (1) or more classes of property in the school district. When the department of local government finance computes a new assessment ratio for a school corporation, the department shall publish the new ratio.