S.C. Code Ann. § 9-3-520

Each political subdivision as to which a plan has been approved under Section 9-3-130 shall pay into the contribution fund, with respect to wages as defined in Section 9-3-20, at such time or times as the State agent may by regulation prescribe, contributions in the amounts and at the rates specified in the applicable agreement entered into by the State agent under Sections 9-3-110 and 9-3-120.