S.C. Code Ann. § 12-2-50

(A) Both the principal and interest of all bonds, notes, and certificates of indebtedness, by or on behalf of the United States government, the State, or an authority, agency, department, or institution of the State, and all counties, school districts, municipalities, and other political subdivisions of the State, and all agencies thereof, are exempt from all state, county, municipal, school district, and all other taxes or assessments, except estate or other transfer taxes, direct or indirect, general or special, whether imposed for the purpose of general revenue or otherwise. This exemption extends to all recipients of all interest paid on the obligation, whether paid directly or paid indirectly through a trustee, guardian, or other fiduciary. (B) "Bonds" as used in this section applies to general obligation bonds and bonds payable wholly or in part from any special fund or from the revenues of a project or undertaking of the issuer.