Indiana Code Title 36. Local Government § 36-7-13-13

Sec. 13. (a) If an advisory commission on industrial development designates a district under section 12 or 12.1 of this chapter or if the legislative body of a county or municipality adopts an ordinance designating a district under section 10.5 of this chapter, the advisory commission, or the legislative body in the case of a district designated under section 10.5 of this chapter, shall send a certified copy of the resolution or ordinance designating the district to the department of state revenue by certified mail and shall include with the resolution a complete list of the following:

(b) The advisory commission, or the legislative body in the case of a district designated under section 10.5 of this chapter, shall update the list:

(c) Not later than sixty (60) days after receiving a copy of the resolution or ordinance designating a district, the department of state revenue shall determine the gross retail base period amount and the income tax base period amount.

(d) Not later than sixty (60) days after receiving a certification of a district's modified boundaries under section 12.5(c) of this chapter, the department shall recalculate the gross retail base period amount and the income tax base period amount for a district modified under section 12.5 of this chapter.