N.C. Gen. Stat. § 160A-480.14

Any bonds and notes issued by the Authority under the provisions of this Part shall be exempt from all State, county, and municipal taxation or assessment, direct or indirect, general or special, whether imposed for the purpose of general revenue or otherwise, excluding income taxes on the gain from the transfer of bonds and notes, and franchise taxes. The interest on bonds and notes issued by an Authority under the provisions of this Part shall not be subject to taxation as to income.