La. Revenue and Taxation § 47:306.1
Persons, as defined in this Chapter, engaged in the business of transporting passengers or property for hire in interstate or foreign commerce, whether by railroad, railway, automobile, motor truck, boat, ship, aircraft or other means, may, at their option under rules and regulations prescribed by the collector, register as dealers and pay the taxes imposed by R.S. 47:302 A on the basis of the formula hereinafter provided.
Such persons, when properly registered as dealers, may make purchases in this state or import property into this state without payment of the sales or use taxes imposed by R.S. 47:302 A at the time of purchase or importation, provided such purchases or importations are made in strict compliance with the rules and regulations of the collector. Thereafter, on or before the 20th day of the month following the purchase or importation, the dealer shall transmit to the collector, on forms secured by him, returns showing gross purchases and importations of tangible personal property, the cost price of which has not previously been included in a return to the state. The amount of such purchases and importations shall be multiplied by a fraction, the numerator of which is Louisiana mileage operated by the taxpayer and the denominator of which is the total mileage, to obtain the taxable amount of tax basis. This amount shall be multiplied by the tax rate to disclose the tax due.
Each such dealer, at the time of making the return required hereunder, shall remit to the collector the tax due for the preceding calendar month as shown on the return.
La. Revenue and Taxation § 47:306.1