S.C. Code Ann. § 41-41-40
Any person who, has received any sum as benefits under Chapters 27 through 41 of this title while any conditions for the receipt of benefits imposed by such chapters were not fulfilled in his case or while he was disqualified from receiving benefits shall be liable to repay the commission for the unemployment compensation fund a sum equal to the amount so received by him. In the event full repayment of benefits, to which an individual was determined not entitled, has not been made such sum will be deducted from any future benefits payable to him under Chapters 27 through 41 of this title, and such sum shall be collectible in the manner provided in Sections 41-31-380 to 41-31-400 for the collection of past-due contributions.
The commission may, at its discretion, attempt collection of overpayments through the South Carolina Department of Revenue in accordance with Section 12-7-2240. If the overpayment is collectible in accordance with Section 12-7-2240, the commission shall add to the amount of the overpayment a collection fee of ten dollars for each collection attempt.