Ind. Code § 36-7.5-4.5-13
(a) As used in this chapter, "state income tax base period amount" means the aggregate amount of state adjusted gross income taxes paid or remitted by or on behalf of:
(2) residents living within the district;
for the calendar year in which the district was established under this chapter, as determined by the department.
As added by P.L.248-2017, SEC.10. Amended by P.L.236-2023, SEC.192.