Commencing October 1, 1985, the circuit clerk in Coffee County shall be entitled to receive a total expense allowance in an amount which when added to the salary paid by the state will make the total compensation thirty-three thousand dollars ($33,000) per annum. Such expense allowance shall be in lieu of any and all other expense allowances of any nature whatsoever heretofore authorized and shall be payable in equal monthly installments from the county general fund.