S.C. Code Ann. § 42-1-380: Waiver of exemption by employer.

Any person employing employees in the State and exempted from the mandatory provisions of this title may come in under the terms of this title and receive the benefits and be subject to the liabilities of this title by filing with the commission a written notice of his desire to be subject to the terms and provisions of this title. Any such person shall come under the provisions of this title and be affected thereby thirty days after the date of such notice.