S.C. Code Ann. § 42-9-350: Payment of compensation of employee working for several employers at time of injury.

Whenever an employee for whose injury or death compensation is payable under this title shall, at the time of the injury, be in joint service of two or more employers subject to this title, such employers shall contribute to the payment of such compensation in proportion to their wages liability to such employee. But nothing in this section shall prohibit any reasonable arrangement between such employers for a different distribution as between themselves of the ultimate burden of compensation.