(a) Commencing on October 1, 2007, the Coroner of Henry County shall receive an additional expense allowance so that total compensation of the coroner equals eighteen thousand seven hundred thirty-two dollars ninety-six cents ($18,732.96) per annum. This expense allowance shall be payable in equal monthly installments from the general fund of the county.
(b) Beginning with the expiration of the term of the incumbent coroner, the annual salary for the coroner shall be increased to an amount that equals eighteen thousand seven hundred thirty-two dollars ninety-six cents ($18,732.96) per annum, payable in equal monthly installments from the general fund of the county and at that time, subsection (a) shall become null and void.