Indiana Code Title 20. Education § 20-23-8-19

(1) At the expiration of one hundred twenty (120) days after the publication of notice by the governing body if:

(2) If only one (1) plan is on the ballot and it receives more affirmative than negative votes, the plan is adopted at the expiration of thirty (30) days following the special election.

(3) If more than one (1) plan is on the ballot, the plan receiving the most votes is adopted at the expiration of thirty (30) days after the special election.

(1) at the time provided in the plan;  or

(2) if a time is not provided or if the time provided is inapplicable due to the lapse of time of the proceedings under this chapter, either on the January 1 or July 1 following the time of adoption of the plan.