S.C. Code Ann. § 56-3-150
(A) A foreign privately owned and operated passenger vehicle of a nonresident, otherwise subject to registration and license as provided by this chapter, may be operated within this State without being registered and licensed pursuant to this chapter, subject to the conditions that at all times when operated in this State the vehicle:
(B) The vehicle of a nonresident must be registered and licensed pursuant to this chapter upon the earlier of a nonresident's:
(C) After receipt of a written inquiry from the auditor of any county in which public records show that a person owns or leases real or personal property in that county, the person who is the owner or operator of a nonregistered vehicle must respond within thirty days with a sworn written statement that:
(E)