S.C. Code Ann. § 8-11-96: When authorization for payroll deductions may be made or terminated; deductions may be prorated.

Authorization for payroll deductions for charitable contributions may be made or terminated at any payroll period by the officer or employee concerned; provided, that either the Comptroller General or the chief finance officer concerned may require that deductions be made pro rata from each payroll check or in such other manner as will reduce to a minimum both the cost of handling such deductions and any interference with regular payroll procedures.