S.C. Code Ann. § 12-23-220

Any person who shall have paid a license or occupation tax in the city, town or county in which his principal place of business is situated for the purpose of conducting the business of transporting passengers or baggage for hire by means of carriage, hacks, omnibuses, drays or motor vehicles shall be exempt from the payment of any license or occupation tax in any other county, city or town to which or from which such passengers or baggage are transported and a license issued by an occupation tax paid to any county, city or town within the State by a person engaged in any such business shall be good in every county, city or town within the State. But nothing contained in this section shall permit the carrying on of the business exempted in this section within any incorporated city or town or within any other county, except the city, town or county in which the license is obtained or tax paid, except for the purpose of taking on and discharging passengers and baggage which is destined for another city, town or county, and this section shall apply to interurban business only.