S.C. Code Ann. § 12-8-2020: Refund of credit for overpayment.

(A) A refund or credit may be allowed for an overpayment of tax withheld pursuant to this chapter to:

(1) the withholding agent to the extent that the withholding agent did not withhold the overpayment amount from the taxpayer; or

(2) the taxpayer to the extent that the overpayment was withheld from the taxpayer.

(B) A refund or credit may be granted to a withholding agent who has withheld taxes in error if the withholding agent has refunded or unconditionally credited the amount erroneously withheld to the taxpayer and the amount is refunded or credited to the taxpayer before the issuance of the original wage and tax statement for the calendar year.