This page covers the most important aspects of Louisiana's sales tax with respects to vehicle purchases. For vehicles that are being rented or leased, see see taxation of leases and rentals. Louisiana collects a 4% state sales tax rate on the purchase of all vehicles. There are also local taxes of up to 6%. The maximum tax that can be owed is 825 dollars. In addition to taxes, car purchases in Louisiana may be subject to other fees like registration, title, and plate fees.