(a) The Sheriff of Montgomery County shall receive an expense allowance of twenty thousand dollars ($20,000) per year, payable in equal monthly installments from the general fund of the county. This expense allowance shall be in addition to all other compensation or benefits granted to the sheriff and may be treated as compensation for retirement contributions.
(b) Effective beginning the next term of office, the annual salary of the Sheriff of Montgomery County shall be one hundred fifty-five thousand dollars ($155,000) and the expense allowance provided for in subsection (a) shall become null and void.