S.C. Code Ann. § 12-21-80: Payment of tax by temporary, transient or itinerant businesses; penalties.

In the case of any person engaging in a temporary, transient or itinerant business which is taxable under the provisions of this chapter, the entire tax shall be paid upon demand by the department or any duly authorized agent thereof, and in case the tax is not paid upon demand all penalties provided for by this chapter shall immediately apply.