S.C. Code Ann. § 37-3-206

(1) If a debtor owes an unpaid balance to a lender with respect to a consumer loan, refinancing, or consolidation, and becomes obligated on another consumer loan, refinancing, or consolidation with the same lender, the parties may agree to a consolidation resulting in a single schedule of payments. If the previous consumer loan, refinancing, or consolidation was not precomputed, the parties may agree to add the unpaid amount of principal and accrued charges on the date of consolidation to the principal with respect to the subsequent loan. If the previous consumer loan, refinancing, or consolidation was precomputed, the parties may agree to refinance the unpaid balance pursuant to the provisions on refinancing (Section 37-3-205) and to consolidate the principal resulting from the refinancing by adding it to the principal with respect to the subsequent loan. In either case the lender may contract for and receive a loan finance charge based on the aggregate principal resulting from the consolidation at a rate not in excess of that permitted by the provisions on loan finance charge for consumer loans (Section 37-3-201) or the provisions on loan finance charge for supervised loans (Section 37-3-508), whichever is appropriate. (2) The parties may agree to consolidate the unpaid balance of a consumer loan with the unpaid balance of a consumer credit sale. The parties may agree to refinance the previous unpaid balance pursuant to the provisions on refinancing sales (Section 37-2-205) or the provisions on refinancing loans (Section 37-3-205), whichever is appropriate, and to consolidate the amount financed resulting from the refinancing or the principal resulting from the refinancing by adding it to the amount financed or principal with respect to the subsequent sale or loan. The aggregate amount resulting from the consolidation shall be deemed principal, and the creditor may contract for and receive a loan finance charge based on the principal at a rate not in excess of that permitted by the provisions on loan finance charge for consumer loans (Section 37-3-201) or the provisions on loan finance charge for supervised loans (Section 37-3-508), whichever is appropriate.