Car sales tax is one of several costs you pay when buying a vehicle. Knowing how it is calculated — and how it differs from other fees — helps you budget accurately and avoid surprises at the dealership.
Sales tax vs. registration and title fees
Sales tax is a percentage-based tax on the purchase price of the vehicle, collected by the dealer at the time of sale or paid when you register the vehicle. Registration and title fees are separate administrative charges that cover the cost of registering your vehicle with the state and issuing a title in your name.
Registration fees are typically flat or based on vehicle weight, age, or type — not the purchase price. In most states, these fees are not subject to sales tax. Dealer documentation fees, however, may or may not be taxable depending on the state. This calculator automatically determines whether dealer fees are taxable in your selected state and shows it clearly in the results.
How trade-ins and rebates affect your tax
In most states, trading in a vehicle reduces the taxable purchase price. For example, if you buy a $30,000 car and trade in a vehicle worth $10,000, you only pay sales tax on the $20,000 difference. This is called a trade-in tax credit, and it can save you a significant amount.
Manufacturer rebates work similarly in most states — they reduce the taxable base before the sales tax rate is applied. California is a notable exception: it taxes the full purchase price regardless of trade-in value or rebates. This calculator applies each state’s specific rules automatically.
State and local tax differences
Vehicle sales tax rates vary significantly across the United States. Most states charge a flat state sales tax rate, but local counties and cities may add their own surtax on top. For example, in Texas the state rate is 6.25%, but local jurisdictions can add up to 2%, bringing the total to 8.25%. In Florida, the local surtax only applies to the first $5,000 of the purchase price.
Some states do not use traditional sales tax at all. Georgia charges a one-time Title Ad Valorem Tax (TAVT) instead. North Carolina uses a 3% Highway Use Tax with a cap for certain vehicle classes. This tool models each of these mechanisms so you get an accurate estimate for your specific state.
What is an out-the-door price?
The out-the-door (OTD) price is the total amount you pay to drive the vehicle off the lot. It includes the vehicle purchase price, all sales tax, title and registration fees, dealer documentation fees, and any other add-on fees — minus any trade-in credit and rebates. It is the most complete picture of what the vehicle will actually cost you.
This calculator shows every component of the out-the-door price individually, so you can see exactly how much is tax, how much is fees, and how much is the vehicle itself. Use it to compare offers from different dealers and states.