Sec. 8. As used in this chapter, "taxpayer" means a business entity that:
(1) has an Indiana corporate headquarters; or
(2) is a subsidiary of a business entity with an Indiana corporate headquarters;
and that is liable under IC 6-1.1-2-4, as applied under IC 6-1.1-3 or IC 6-1.1-8, for ad valorem property taxes on abatement property.