S.C. Code Ann. § 38-9-110

A domestic company, in order to comply with the laws of any other state or territory of the United States, may make a voluntary deposit with the director or his designee in excess of the amount required by Section 38-9-80. This excess deposit is subject to all other applicable provisions of the laws of this State relating to the deposits of insurers, except that the excess deposit must be for the protection of all the company's policy obligations, ratably and without preference, notwithstanding the provisions of Section 38-9-90. However, a domestic company making this voluntary deposit is relieved of making the deposit required by Section 38-9-80 if the company meets the definition of a qualified insurer as defined in Section 38-9-100 and if the voluntary deposit meets the requirements of Section 38-9-100.