Car Sales Tax Calculator
Estimate the sales tax on a car purchase, including a trade-in credit and dealer fees, to get your out-the-door price.
How it works
Taxable amount = price − trade-in (where the state allows the credit) · Sales tax = taxable × rate · Out-the-door = price − trade-in + tax + fees
In most U.S. states, a trade-in lowers the amount you are taxed on: you pay sales tax only on the price difference, not the full sticker. A few states tax the full purchase price regardless, so the toggle matters. Dealer documentation and registration fees are added on top of the tax to reach the out-the-door price — the real number you finance or pay.
Worked example
On a $30,000 car with an $8,000 trade-in in a state that credits it, tax applies to $22,000. At 7% that is $1,540. Adding $400 in fees and subtracting the trade-in, the out-the-door amount is 22,000 + 1,540 + 400 = $23,940.
Frequently asked questions
Do I pay sales tax on the trade-in value?
In most states, no — the trade-in reduces the taxable amount, so you are taxed only on the difference between the new car’s price and your trade-in. A handful of states tax the full purchase price; set the toggle to match your state.
What is the out-the-door price?
It is the total you actually pay to drive away: the vehicle price minus any trade-in, plus sales tax and dealer/registration fees. Negotiating on out-the-door price rather than the sticker keeps fees from inflating the deal.
Is car sales tax based on where I live or where I buy?
Usually where you register the vehicle — your home state and locality — not where the dealer is. If you buy out of state, you typically pay your home state’s rate when you register. Rates and rules vary, so confirm locally.
Related calculators
Tax rules and trade-in treatment vary by state and locality — confirm with your DMV or dealer. Not tax advice.