S.C. Code § 9-3-530
Each political subdivision required to make payments under Section 9-3-520 is authorized, in consideration of the employee's retention in, or entry upon, employment after enactment of this chapter, to impose upon each of its employees, as to services which are covered by an approved plan, a contribution with respect to his wages as defined in Section 9-3-20 not exceeding the amount of tax which would be imposed by Section 1400 of the Federal Insurance Contributions Act if such services constituted employment within the meaning of that act, and to deduct the amount of such contribution from his wages as and when paid. Contributions so collected shall be paid into the contribution fund in partial discharge of the liability of such political subdivision or instrumentality under Section 9-3-520. Failure to deduct such contribution shall not relieve the employee or employer of liability therefor.
S.C. Code § 9-3-530