(1) County or regional industrial development companies shall be exempt from taxation under the Income Tax Act of 1929, § 26-51-101 et seq., and from the payment of any other income taxes levied by a county or a municipality.
(2) Dividends on stock or distributions with respect to units of interest of any such company pursuant to § 15-4-1215 shall be exempt from all state, county, or municipal income tax.
(3) Interest on bonds, notes, or other obligations of any company issued under and in accordance with the provisions of this subchapter shall be exempt from all state, county, or municipal income taxes.
(4) Corporations and limited liability companies shall file income tax returns each year at the time provided for the filing of corporate or partnership income tax returns, respectively.
(5) A company claiming exemption from income tax under this section shall attach to the return required in subsection (b) of this section a certification from the Bank Commissioner stating that the company has been incorporated or organized and is operating as a corporation or limited liability company in accordance with the provisions of this subchapter.