Sec. 4. (a) After June 30, 2025, the county fiscal body may adopt an ordinance to increase the tax rate imposed under section 3 of this chapter to a tax rate that exceeds five percent (5%) but does not exceed eight percent (8%). If the county imposes a tax rate that exceeds five percent (5%), the portion that exceeds five percent (5%) terminates January 1, 2047.
(b) If the county fiscal body adopts an ordinance for an increase under this section:
(1) it shall immediately send a certified copy of the ordinance to the department of state revenue; and
(2) the increase applies to transactions after the last day of the month in which the ordinance is adopted, if the county fiscal body adopts the ordinance on or before the fifteenth day of a month. If the county fiscal body adopts the ordinance after the fifteenth day of a month, the tax applies to transactions after the last day of the month following the month in which the ordinance is adopted.