S.C. Code Ann. § 12-2-120

(A) Individuals whose residency or taxpayers whose property or business location is considered to have changed from North Carolina to South Carolina solely as a result of the boundary clarification, as contained in the amendments to Section 1-1-10, effective January 1, 2017, is not liable for any taxes for periods prior to the boundary clarification date based solely on a claim that the individual was a resident or the taxpayer's property or business location was located in South Carolina in the prior year. (B) Individuals whose residency or taxpayers whose property or business location is considered to have changed from South Carolina to North Carolina solely as a result of the boundary clarification are not entitled to a refund of any state, county, or local taxes or license fees for periods prior to the boundary clarification date based solely on a claim that the individual was not a resident of South Carolina or the taxpayer's property or business location was not in South Carolina in prior years. (C) Taxpayers who have sold products or services subject to South Carolina taxes to persons whose residence or location is considered to have changed from South Carolina to North Carolina solely as a result of the boundary clarification are not allowed a refund for any taxes paid prior to the boundary clarification as a result of these sales.