S.C. Code Ann. § 2-3-25

Effective after July 1,1995, if a member of the General Assembly resigns or is expelled, he must repay any compensation he has received for that year on a pro rata basis, pro rated from the first day of the session in January each year through the end of the annual session. The Clerk of the Senate or the Clerk of the House of Representatives, as appropriate, shall request the repayment of the compensation paid. If the member does not repay the monies he has received within thirty days of the date of request by the clerk, the Comptroller General is authorized to deduct the appropriate amount from any retirement benefits the member may receive and remit this amount to the credit of the general fund of the State, pro rated from the first day of the session in January each year through the end of the annual session.