Banking corporations organized under the laws of Louisiana and other corporations whose income is derived solely from banking corporations and from securities exempt from taxation by the State of Louisiana and shareholders of such banking corporations shall be subject to the payment of all taxes of the State of Louisiana and any subdivision thereof in the same manner as national banking corporations doing business in Louisiana and their shareholders are taxed by the State of Louisiana and any subdivision thereof under the laws and regulations of the United States of America and the State of Louisiana, and in no other manner.  

Acts 1966, No. 445, §1.