N.C. Gen. Stat. § 122D-14
The exercise of the powers granted by this Chapter will be in all respects for the benefit of the people of the State, for their well-being and prosperity and for the improvement of their social and economic conditions, and the Authority shall not be required to pay any tax or assessment on any property owned by the Authority under the provisions of this Chapter or upon the income therefrom.
Any obligations issued by the Authority under the provisions of this Chapter shall at all times be free from taxation by the State or any local unit or political subdivision or other instrumentality of the State, excepting inheritance or gift taxes, income taxes on the gain from the transfer of the obligations, and franchise taxes. The interest on the obligations is not subject to taxation as income.
N.C. Gen. Stat. § 122D-14