S.C. Code Ann. § 12-53-20

Notwithstanding any other provision of law, the department, or its duly authorized representatives, may attach, levy upon, or seize bank deposits and all other choses in action, except for salaries and wages, on property incapable of manual levy or delivery, hereinafter called intangible, belonging, owing, or to become due to any taxpayer, subject to any provisions of any tax or license law of which the administration, enforcement, and collection is imposed upon the department. The person owning such intangible, matured or unmatured, or having the same in possession or control, shall become liable for all sums due by the taxpayer to the extent of the amount of the intangible belonging, owing, or to become due to the taxpayer, subject to the setoff of any matured or unmatured indebtedness of a taxpayer to said person. To effect such attachment or levy, the department, or its duly authorized representative, shall serve, or cause to be served upon the taxpayer and upon such person, notice of such attachment and levy, which notice may be served by any authorized representative of the department, or by any officer having authority to serve summonses.