S.C. Code Ann. § 8-13-1370
(A) Contributions received by a candidate that are in excess of expenditures during an election cycle must be used by the candidate upon final disbursement:
(C) A committee required to file reports under this article which has an unexpended balance of funds upon final disbursement not otherwise obligated for expenditures incurred to further the committee's purposes must designate how the surplus funds are to be distributed. The surplus funds must be: