Transparent method
The formula
Worked example
Example inputs
How to interpret the result
The price on the window is not the price you pay, and taxes and fees close the gap. A $42,000 car with a $10,000 trade-in credit and $2,000 of incentives has a taxable price of $30,000 in this model, and at 7 percent the sales tax is $2,100. Adding $1,200 of registration and dealer fees gives a drive-out price near $33,300. Whether a trade-in reduces the taxable price depends on the state, and so does the tax on incentives and fees.
Before you rely on it
What to check
Ask for an out-the-door price in writing, listing tax, title, registration and every dealer charge. That single number is the one to compare across dealers.
The common error
Where people go wrong with car sales tax & fees calculator
Applying the sales tax to the full price without checking the local rules. Some places tax the price before the trade-in and others after, which changes the tax by hundreds of dollars.
Sensitivity evidence
How negotiated vehicle price changes the estimated drive-out price
| Negotiated vehicle price | Estimated drive-out price | Estimated sales tax | Estimated taxable vehicle price |
|---|---|---|---|
| $33,600 | $24,312 | $1,512 | $21,600 |
| $37,800 | $28,806 | $1,806 | $25,800 |
| $42,000worked example | $33,300 | $2,100 | $30,000 |
| $46,200 | $37,794 | $2,394 | $34,200 |
| $50,400 | $42,288 | $2,688 | $38,400 |
Every input, tested
Which input moves the estimated drive-out price most
| Input | Tested from | To | Estimated drive-out price at each end | Swing |
|---|---|---|---|---|
| Negotiated vehicle price | $37,800 | $46,200 | $28,806 to $37,794 | $8,988 (27%) |
| Taxable trade-in credit | $9,000 | $11,000 | $34,370 to $32,230 | $2,140 (6.4%) |
| Sales-tax rate | 6.0% | 8.0% | $33,000 to $33,600 | $600 (1.8%) |
| Taxable-price incentives | $1,800 | $2,200 | $33,514 to $33,086 | $428 (1.3%) |
| Registration and dealer fees | $1,080 | $1,320 | $33,180 to $33,420 | $240 (0.7%) |
Two variables at once
Estimated drive-out price by negotiated vehicle price and taxable trade-in credit
| Negotiated vehicle price \ Taxable trade-in credit | $8,000 | $10,000 | $12,000 |
|---|---|---|---|
| $33,600 | $26,452 | $24,312 | $22,172 |
| $37,800 | $30,946 | $28,806 | $26,666 |
| $42,000 | $35,440 | $33,300 | $31,160 |
| $46,200 | $39,934 | $37,794 | $35,654 |
| $50,400 | $44,428 | $42,288 | $40,148 |
Step by step
The worked example, input by input
| Input | Value used |
|---|---|
| Negotiated vehicle price | $42,000 |
| Taxable trade-in credit | $10,000 |
| Taxable-price incentives | $2,000 |
| Sales-tax rate | 7.0% |
| Registration and dealer fees | $1,200 |
| Estimated drive-out price | $33,300 |
| Estimated sales tax | $2,100 |
| Estimated taxable vehicle price | $30,000 |
Where the inputs come from
Negotiated vehicle price is what you agreed with the seller before tax. Taxable trade-in credit is the value credited for your old car, which reduces the taxable price in most states but not all. Taxable-price incentives are manufacturer rebates that are subtracted before tax in some states and not in others. Enter your combined state, county and city sales tax rate and the registration and dealer fees. Rules differ, so check your state's revenue department.
Using the estimated drive-out price in a real decision
Ask every dealer for an out-the-door quote, since dealer fees vary and can be a large add-on.
When the result stops applying
States treat trade-ins, rebates, doc fees and add-ons differently, so the taxable base changes from place to place. Some states tax vehicles at the buyer's home address and others at the dealer's. Leases have different tax rules. Title and registration fees can depend on the vehicle's weight, value or age.
What to compare it with
Use the total in the auto loan calculator, and the general sales tax and reverse sales tax pages for other purchases. The trade-in equity and negative equity calculators show the effect of the old car. Compare out-the-door prices, not monthly payments, when shopping.
People also ask
Frequently asked questions
Do I pay sales tax on the full price of the car?
In most states you pay tax on the price minus the trade-in value, but a few states tax the full price regardless of the trade.
What is an out-the-door price?
The total you pay including the vehicle price, taxes, registration, dealer fees and any add-ons. It is the best number for comparing offers.
Are dealer documentation fees negotiable?
Some states cap them and in others they vary widely. Even when the fee is fixed, you can negotiate the vehicle price to offset it.