How to calculate the out-the-door price of a car, step by step

The out-the-door formula is simple once every line is on the page: price, minus discounts and rebates, plus tax, government fees, dealer fees and add-ons. A worked example, and how to check a dealer's total against its own lines.

By Eyal Malka · November 7, 2026

If you have a dealer quote in front of you, you can rebuild its out-the-door total yourself in a couple of minutes. You do not need to know your state's tax rules in detail: the point is to check that the total the dealer printed matches the lines the dealer printed. If it does not, you have a specific question to ask before you sign.

The out-the-door formula

Out-the-door price = selling price − discounts − rebates + sales tax + government fees + dealer fees + add-ons

That is all it is. The hard part is making sure every line is on the page and each one is in the right bucket. (If you are not sure what counts as what, start with what an out-the-door price is.)

Your trade-in and down payment are not in this formula. They come afterwards, when you work out what is left to pay or finance.

Step by step, with an example

The figures below are made up, to show the arithmetic.

1. Start with the selling price

Use the agreed price for the vehicle itself. On a new car this is not necessarily the MSRP on the window sticker; on a used car it is the dealer's price for that car.

Example: $28,500.00

2. Subtract dealer discounts

Any reduction the dealer gives on the price: "dealer discount", "price adjustment", "internet price savings".

Example: −$500.00 → $28,000.00

3. Subtract rebates and incentives

Manufacturer rebates ("customer cash", "factory rebate", "loyalty cash") lower what you pay. Some quotes show them after the total instead; the end result should be the same. See rebate vs dealer discount.

Example: −$1,000.00 → $27,000.00

4. Add sales tax, as printed

Use the tax the quote shows. Which amounts are taxed, whether rebates or a trade-in reduce the taxable amount, and the local rate all depend on where you live and register the car, so an outside calculator can easily be wrong. Your job here is to include the dealer's figure, then ask how it was worked out if it looks off.

Example (an example rate of 6% on $27,000): +$1,620.00 → $28,620.00

5. Add government fees

Title, registration, plates, license and inspection fees. Dealers usually collect these and pass them on; sometimes they are estimates.

Example: +$410.00 → $29,030.00

6. Add dealer fees

The documentation fee and anything else the dealer charges for paperwork, preparation or delivery. See dealer fees explained and the dealer doc fee.

Example: +$499.00 → $29,529.00

7. Add add-ons and optional products

Service contracts, GAP, paint or fabric protection, VIN etching, nitrogen-filled tires, accessories. Each should be its own line with its own price. See dealer add-ons explained.

Example: none → $29,529.00

8. Compare with the printed total

If the quote prints $29,529.00, the arithmetic checks out. If it prints something else, look at the difference.

When the total does not match

A difference is not proof of anything. Quotes are typed by people, and lines get moved around. But it is always worth asking about, and the size of the gap is often a clue:

• The gap equals one line exactly. That line may have been counted twice, or left out of the total.
• The gap equals all the rebates. The rebates may be applied after the total, like a payment. Ask the dealer to confirm they are still taken off what you pay.
• The gap is a fee you do not see listed. Ask for the missing line to be shown.
• The gap is in the tax. Ask what amount the tax was calculated on.

Then: what is left to pay or finance

Once you have the out-the-door price:

Balance = out-the-door price − trade-in allowance + trade-in payoff − down payment − deposit

If you are financing, that balance should match the amount financed on the quote. Here is the example again with a $3,000 down payment and no trade-in:

• $29,529.00 − $3,000.00 = $26,529.00 to finance.

At an example 6.9% APR over 72 monthly payments, that is about $451.02 a month and $32,473.44 in total payments. See amount financed vs out-the-door price and why a longer loan can cost more.

Use the calculator

The free out-the-door price calculator does every step above for your own numbers, including the trade-in, down payment, monthly payment and total of payments, and shows the working.

Let us do the checking

Upload a photo or PDF of the quote to Explain My Dealer Quote. You confirm the figures it reads, and it rebuilds the out-the-door price, the balance and the loan totals from the quote's own lines, shows any gap with the calculation, and explains every fee and add-on.

Frequently asked questions

What is the formula for out-the-door price?

Selling price, minus discounts and rebates, plus sales tax, government fees (title and registration), dealer fees and any add-ons. Trade-ins and down payments are subtracted afterwards to get the balance, not the out-the-door price.

Should I use my own tax rate to check the dealer's tax?

Use the tax the quote prints. Tax rules differ by state and sometimes by city or county, including whether rebates and trade-ins reduce the taxed amount. If the printed tax looks wrong, ask the dealer what amount it was calculated on.

Why doesn't the dealer's total match my calculation?

Often a line is missing from the page, counted twice, or shown in a different place (rebates are sometimes shown after the total). Find the line the difference matches and ask the dealer about it before you sign.

Is the destination charge part of the out-the-door price?

Yes. On a new car the destination charge is part of the vehicle's price, and it should be included in the selling price or listed as its own line.

Do I include my down payment when calculating the out-the-door price?

No. The down payment reduces the balance you pay or finance after the out-the-door price is worked out.