La. Revenue and Taxation § 47:344
In the case of a new business, the license tax is due and payable upon commencement of the business. Within forty days after commencing the business, each person shall compute in the manner provided by R.S. 47:348 the balance of the license tax, if any, owed for the year in which the business is started and pay such tax balance. When the business is begun prior to July first of any year, the tentative tax shall be the minimum annual rate for the particular class of business in cases in which the tax is based on gross receipts, sales, fees, premiums or commissions, or the full annual rate in cases in which the tax is based on a specific amount per unit. When the business is begun on or after July first of any year, the tentative tax shall be one-half of the minimum annual rate or the specific amount per unit, as the case may be.
La. Revenue and Taxation § 47:344
SEE ACTS 1988, NO. 752, §3 REGARDING EFFECTIVE DATE.