S.C. Code Ann. § 20-7-1440
(C) In actions for support for the spouse or dependent children, when paid through the court or through a centralized wage withholding system operated by the Department of Social Services and not directly, the court shall assess costs against the party required to pay the support in the amount of five percent of the support paid, which costs must be in addition to the support money paid. The revenue from the costs must be remitted as provided in Section 14-1-203.
By making the additional five percent payment on child support required by this subsection to the court or through the centralized wage withholding system operated by the Department of Social Services, the payor agrees: