(a) Commencing April 1, 2012, the Sheriff of Dale County shall be entitled to an additional expense allowance in the amount of fifteen thousand dollars ($15,000) per annum, which shall be in addition to all other expense allowances, compensation, or salary provided by law. This expense allowance shall be payable in equal monthly installments from the general fund of the county and may be treated as compensation for retirement contributions.
(b) Beginning with the expiration of the term of the incumbent sheriff, the annual salary for the sheriff shall be increased by fifteen thousand dollars ($15,000) 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.