A state payroll revolving account is created in the state treasury, for the payment of compensation to employees and officers of the state and distribution of all amounts withheld therefrom pursuant to law and amounts authorized by employees to be withheld pursuant to law; also for the payment of the state's contributions for retirement and insurance and other employee benefits: PROVIDED, That the utilization of the state payroll revolving account shall be optional except for agencies whose payrolls are prepared under a centralized system established pursuant to regulations of the director of financial management.