La. R.S. 40:479

All bonds, notes, certificates, and other instruments evidencing indebtedness of a housing authority or any subsidiary thereof or conveying an equity participation in any development of a local housing authority or any subsidiary thereof are deemed to be issued for an essential public and governmental purpose and shall be free of taxation of any kind by this state and its public agencies unless the authority issuing such bonds, notes, certificates, or other instruments shall elect that they be taxable. Any such election shall apply only to the specific issue of bonds, notes, certificates, or other instruments with respect to which such election is expressly made.