Out-the-Door Price Calculator
The deal on paper, line by line
Your result will appear here
Fill in the fields on the left and this updates as you type.
Know what this estimate is based on
- Jurisdiction
- General mathematical model
- Scope and limitations
- Educational estimate only. Confirm the assumptions, current rules, fees, and rounding that apply to your situation before making a decision.
- Source links checked
- Jul 30, 2026
Built and regression-tested by Smart Tools Lab. It has not been individually reviewed by a licensed financial, tax, or legal professional.
How to use
- 01
Enter the negotiated price of the car before anything is added, then the dealer add-ons you have agreed to pay for. Add-ons are taxed like the car, so they belong here rather than with the fees.
- 02
Add the dealer's documentation fee and the title, registration and plate fees from the buyer's order. The doc fee is the dealer's charge and is taxed on this page; title and registration go to the state and are not.
- 03
Enter the sales tax rate that applies to a vehicle registered at your address, state plus local. The Tax Foundation's midyear 2026 average is 7.53%, but some states use a separate motor vehicle rate, such as 6.25% in Texas and 4.15% in Virginia.
- 04
Enter the trade-in value, what you still owe on that car, any manufacturer rebate and your cash down payment.
- 05
Read the out-the-door price, then find your state's pairing in the table: trade-in credited or not, rebate taxed or not. The spread between the four rows is what your state's rules are worth on this deal.
Formula
Taxable price = negotiated price + add-ons + doc fee, less the trade-in value if your state credits it, less the rebate if your state taxes the price after the rebate. Sales tax = taxable price × your rate. Out-the-door price = negotiated price + add-ons + doc fee + title and registration + sales tax − rebate − trade-in value + payoff still owed on the trade-in. Amount financed = out-the-door price − down payment. The page figures the taxable price four ways, one for each pairing of the two state rules, and the headline uses trade-in credited with the rebate taxed.
Example
A $42,000 car with $995 of add-ons, a $499 doc fee, $450 of title and registration and a 7.53% tax rate, a $15,000 trade-in with $9,000 still owed, a $1,500 rebate and $4,000 down. With the trade-in credited and the rebate taxed, the taxable price is $28,494 and the tax $2,146, so the out-the-door price is $38,590 and $34,590 is financed. The add-ons, fees and tax add $4,090, or 9.7%, to the negotiated price. The trade-in credit is worth $1,130 and taxing the rebate costs $113. In a state that credits the trade-in and taxes the price after the rebate, the total falls to $38,477; in a state with no trade-in credit that taxes the rebate, it rises to $39,719 on $3,275 of tax. The spread across the four treatments is $1,242.
Definitions
- Out-the-door price
- Everything you pay to drive the car away, with the trade-in and rebate taken off and any payoff on the trade-in added back. The down payment is part of how you pay it, not a reduction of it.
- Trade-in tax credit
- The rule in most states that the trade-in value comes off the price before sales tax is figured. California and Virginia do not allow it.
- Manufacturer rebate
- Cash from the carmaker applied to the deal. Some states, Washington among them, tax the price before it comes off; others tax the price after.
- Documentation fee
- The dealer's charge for processing the sale paperwork. Capped in some states, such as California at $85 or $70, and set by the dealer in others.
- Negative equity
- Owing more on a trade-in than the dealer will pay for it. The difference is added to the new deal instead of coming off it.
Good to know
Why the sticker and the signature line never match
The negotiated price is the number buyers argue about, and it is rarely the number they sign for. A buyer's order stacks several separate charges on top of it, and each follows its own rule. Dealer add-ons, such as paint protection or accessories, are priced by the dealer and taxed like the car. The documentation fee is the dealer's charge for processing the paperwork. Title, registration and plate fees are set by the state and passed through. Sales tax is figured on some combination of all of these, depending on where you live. Then value comes back the other way: a trade-in, a manufacturer rebate, and your cash down payment. On this page's defaults a $42,000 car picks up $995 of add-ons, a $499 doc fee, $450 of title and registration and $2,146 of sales tax, so before the trade-in and rebate come off the total is $46,090, which is $4,090 or 9.7% above the negotiated price. Take off a $15,000 trade-in and a $1,500 rebate, add back the $9,000 still owed on the trade-in, and the out-the-door price is $38,590. The down payment is different in kind. It does not reduce the price; it is how you pay part of it, so $4,000 down leaves $34,590 to finance. For scale, Edmunds' Q2 2026 averages for new vehicles were $44,156 financed with $5,815 down. The practical lesson is to negotiate the out-the-door figure itself, in writing and itemized, rather than a monthly payment. A payment can be held steady while the term stretches and the add-ons grow, and Edmunds found 23.9% of new-vehicle buyers took loans of 84 months or longer in Q2 2026. An itemized out-the-door quote is the only number that shows every line at once.
Two state rules that decide how much tax you pay
Sales tax on a car is not simply the rate times the price, because states answer two questions differently, and they answer them independently of each other. The first is whether the trade-in comes off the price before tax is figured. In most states it does. Texas charges its 6.25% motor vehicle tax on the sales price less the amount given for a trade-in, provided the trade-in is part of the same transaction. California does not: its tax agency tells dealers they cannot deduct the allowance for the trade-in. Virginia does not either: its DMV says the gross sales price does not include credit for trade-ins. The second question is whether a manufacturer rebate is taxed before it comes off. Washington's Department of Revenue says rebates from the manufacturer are part of the selling price and may not be deducted before retail sales tax is charged. Roughly twenty states go the other way and tax the price after the rebate. Dealer discounts are a separate matter again: Washington treats a dealer's own rebate as a discount off the taxable price, and Texas taxes the price less dealer discounts. Two yes-or-no rules make four combinations, and this page prices all four at once instead of asking you to pick a state. On the defaults the tax runs $2,146 with the trade-in credited and the rebate taxed, $2,033 with the trade-in credited and the rebate untaxed, $3,275 with no credit and the rebate taxed, and $3,162 with no credit and no tax on the rebate. The out-the-door price spreads across $1,242. Most of that spread is the trade-in credit, worth $1,130 here; taxing the rebate costs $113. Where rebates are taxed, a dollar knocked off the price is worth more to you than a dollar of rebate, which is worth knowing when a dealer offers you the choice.
The fees: which belong to the dealer and which to the state
The charges added to a car's price fall into two groups, and only one of them is negotiable. Government charges, meaning title, registration, plate fees and the sales tax itself, are set by the state and sometimes by the county, and the dealer simply collects them. They vary widely: depending on the state, registration can depend on the car's weight, value, age or fuel type. On this page they are an editable field, $450 in the example, and they are left untaxed. Dealer charges are a different matter. The documentation fee is the dealer's own charge for preparing and filing the paperwork. Some states cap it. California Vehicle Code 4456.5 allows $85 for dealers in the DMV's private industry partner program and $70 for everyone else, while other states set no cap and leave the amount to the dealer. Virginia's DMV counts the dealer processing fee inside the gross sales price, so it is taxed there, and this page treats it the same way. If your state does not tax it, the tax on the $499 example fee, about $38, comes off. Add-ons are the most negotiable line of all, because the dealer sets their price rather than the manufacturer. They are also more expensive than they look. The $995 of add-ons in the example becomes $1,070 with 7.53% tax, and if it is financed at 6.35% over 60 months, Experian's Q2 2026 average new-car rate, it costs $1,252 by the final payment. When a buyer's order carries a charge with an official-sounding name, the useful question is who keeps the money. If the state does, the charge is fixed. If the dealer does, it is part of the price, and you can negotiate it or decline it like any other part of the price.
The trade-in, the payoff and the amount you finance
A trade-in enters the deal at two figures, and both matter. The first is the value the dealer gives you for the car. The second is what you still owe on it, because the dealer must pay that off before it can take the title. When the value is higher, the difference is equity and it reduces what you pay. On the defaults a $15,000 trade-in with $9,000 owed brings $6,000 of equity. When the payoff is higher, the difference is negative equity, and it is added to the new deal rather than taken off. That position is common. Edmunds found 29.6% of trade-ins toward new vehicles carried negative equity in Q2 2026, by $6,884 on average. The sales tax credit, in states that give one, applies to the trade-in value rather than to your equity, so a car with a large loan against it still reduces the taxable price by its full value. Once the trade-in, payoff and rebate are counted, the down payment decides how much you borrow. On the defaults, $4,000 down against a $38,590 out-the-door price leaves $34,590 to finance. The tax rate deserves a check of its own before you rely on any of this. The Tax Foundation's midyear 2026 figures put the population-weighted average combined sales tax at 7.53%, with Louisiana's average the highest at 10.13% and no statewide sales tax in Alaska, Delaware, Montana, New Hampshire or Oregon. Some states tax vehicles under a separate motor vehicle tax rather than the general sales tax, Texas at 6.25% and Virginia at 4.15%, and a state without a sales tax can still charge fees at titling. The right rate is the one printed on your buyer's order, and the right state rule is the row of the table that matches where the car will be registered.
Frequently asked questions
What does out-the-door price mean?
It is everything you pay to drive the car away: the negotiated price, dealer add-ons, the documentation fee, title and registration and sales tax, less the trade-in and any rebate, plus whatever is still owed on the trade-in. On this page's defaults a $42,000 car comes to $38,590 out the door after a $15,000 trade-in with $9,000 owed and a $1,500 rebate. Before the trade-in comes off, add-ons, fees and tax put $4,090 on top of the negotiated price.
Does a trade-in reduce the sales tax on a car?
In most states it does: the trade-in value comes off the price before tax is figured. Texas, for example, charges its 6.25% motor vehicle tax on the sales price less the trade-in allowance. It is not universal. California's tax agency says dealers cannot deduct the allowance for the trade-in, and Virginia's DMV says the taxable price does not include credit for trade-ins. On the defaults the credit is worth $1,130 at a 7.53% rate.
Is a manufacturer rebate taxed?
It depends on the state. Washington's Department of Revenue treats manufacturer rebates as part of the selling price, so tax is charged on the price before the rebate comes off. Roughly twenty states instead tax the price after the rebate. On a $1,500 rebate at 7.53% the difference is $113. A discount the dealer gives is treated as a price reduction in both Washington and Texas, so where rebates are taxed a price cut is worth slightly more than the same amount of rebate.
What is a reasonable doc fee?
There is no national rule. Some states cap the fee and some do not. California Vehicle Code 4456.5 allows $85 for dealers in the DMV's private industry partner program and $70 for other dealers; in states with no cap the dealer sets it. It is a dealer charge rather than a government fee, and in Virginia it is part of the taxed price, which is how this page treats it.
Why does what I still owe on my trade-in raise the price?
Because the dealer has to pay off your old loan before it can take the car, and that payoff is added to the new deal. If you owe less than the trade-in is worth, only the equity reduces the price: on the defaults a $15,000 trade-in with $9,000 owed brings $6,000 of equity. If you owe more than it is worth, the difference is added to what you finance. Edmunds found 29.6% of trade-ins toward new vehicles were in that position in Q2 2026.
Does the down payment reduce the out-the-door price?
No. The down payment is how you pay part of the out-the-door price, not a reduction of it, which is why this page uses it only for the amount financed. On the defaults $4,000 down turns a $38,590 out-the-door price into $34,590 financed. The trade-in and the rebate do reduce the price, because they are value coming into the deal rather than your own cash going out.
Which sales tax rate should I use?
The rate that applies to a vehicle registered at your address, which should appear on the buyer's order. It is not always the general sales tax rate: Texas taxes vehicles at 6.25% under its motor vehicle tax and Virginia at 4.15%. The Tax Foundation's midyear 2026 population-weighted average combined rate is 7.53%, Louisiana's is the highest at 10.13%, and Alaska, Delaware, Montana, New Hampshire and Oregon have no statewide sales tax.