How to use the Car Purchase Tax Calculator
When buying a car in the US, the sticker price is rarely what you actually pay. Sales tax, title and registration fees, and documentation fees can add several thousand dollars to the total cost.
Enter your vehicle price, your state's sales tax rate, and the dealer fees to see your true out-of-pocket total. Sales tax rates vary widely — from 0% in tax-free states like Oregon to over 9% in Tennessee. Always ask for the out-the-door price before signing any paperwork.
Frequently Asked Questions
Montana, Oregon, New Hampshire, Delaware, and Alaska have no state sales tax. If you live near a border, buying across state lines may save money — but most states require you to pay your home state's tax when registering the vehicle.
Some dealers will reduce or waive the doc fee, especially in a competitive market. However, many states cap the maximum doc fee dealers can charge. Always ask for an itemized breakdown of all fees before finalizing the deal.
In most states, trading in a vehicle reduces the purchase price used for calculating sales tax. For example, buying a $30,000 car with a $10,000 trade-in means tax is calculated on $20,000 in those states.