Neb. Rev. Stat. § 84-1612

All contributions by employees under sections 84-1601 to 84-1615 shall be made by payroll deductions. As each new employee becomes eligible for coverage under sections 84-1601 to 84-1615 , the Director of Administrative Services shall certify the amount to be deducted each pay period from the employee's pay under sections 84-1601 to 84-1615 . When there is any change in the amount of required contribution, such change shall be similarly certified. Such amount shall be deducted each pay period by the director.