01What the out-the-door price tells you
The out-the-door (OTD) price is the total amount you actually pay to drive a car away — the negotiated sale price plus sales tax and every fee: documentation, title, registration and any dealer add-ons. It is the single most useful number in car buying, because a low advertised price means little once taxes and fees are stacked on top. This calculator builds that number for you and, if you have a trade-in or rebate, shows both the comparable OTD price and the cash you will hand over.
Enter the sale price and your local sales tax rate, add any fees the dealer has quoted, and the calculator adds them up instantly. Add a trade-in allowance and it will apply your state’s trade-in tax credit for you. For more money and measurement tools, browse our full calculator library.
02What goes into an out-the-door price
Every OTD price is built from the same handful of parts. Knowing which ones are fixed by your state and which are negotiable is how you avoid overpaying. The Federal Trade Commission warns that advertised prices often exclude fees, so asking for the out-the-door total is the best defence — see the FTC’s guidance on car dealer ads and promotions.
03How to use the out-the-door price when buying
The out-the-door number is a negotiating tool, not just a total. A few habits turn it into leverage:
- Ask for the OTD price in writing. Get the full total — price, tax and every fee — from each dealer before you visit, as the FTC recommends in its buying and owning a car guidance.
- Compare totals, not monthly payments. A low payment can hide a high OTD price stretched over a longer loan.
- Question dealer add-ons. Paint sealant, fabric protection and similar extras are optional; you can decline them.
- Check your registration cost against your state DMV — fees differ widely, as the California DMV registration-fee schedule illustrates.
The math here is exact for the numbers you enter, but a few real-world details sit outside it. Treat the result as a close, dealer-ready estimate.
- Tax rules vary. The trade-in tax credit toggle covers the common case; some states cap the credit or tax rebates differently. Confirm with your state’s motor-vehicle agency via USA.gov motor vehicle services.
- Financing is separate. The OTD price is the cash cost to buy; interest depends on your APR and term.
- Fees are estimates until the dealer’s buyer’s order is in hand — enter their actual quoted figures for a precise total.
- Rebates may be taxed. In some states sales tax is charged before a manufacturer rebate is applied; this calculator subtracts the rebate from what you pay but not from the tax base.
- Enter the negotiated vehicle sale price and your combined sales tax rate.
- Add a trade-in allowance and set whether your state taxes before or after the trade-in.
- Enter any rebate, doc fee, title & registration and other dealer fees.
- Press Calculate to see the out-the-door price, a fee breakdown and the amount you’ll actually pay.
Working through a bigger purchase or project budget? Our other free calculators and everyday tools like the BMI calculator use the same clear, no-signup approach.
04Related calculators
Working through a related project? Try our Lead Time Calculator, Mortgage Recast Calculator, and Early Payoff Calculator.
01The out-the-door price formula
The out-the-door price adds sales tax and every fee to the negotiated sale price. The only subtlety is the taxable amount: in most states the trade-in allowance is subtracted before tax is applied, so a trade-in lowers both what you pay and what you are taxed on.
Where:
- sale price= the negotiated price of the vehicle before tax and fees.
- tax rate= your combined state and local sales tax rate (e.g. 7% → 0.07).
- trade-in= the allowance the dealer credits for your old vehicle.
- fees= documentation, title, registration and any dealer add-ons.
02Worked example
Take a $30,000 car at a 7% sales tax rate with a $5,000 trade-in in a state that grants a trade-in tax credit, a $300 doc fee and $400 in title & registration. Work it one line at a time:
So the out-the-door price is $32,450, and after your trade-in you would finance or pay about $27,450. Taxes and fees added roughly $2,450 to the sticker — about 8%. If your state instead taxed the full $30,000, the tax would be $2,100 and the OTD price $32,800, showing why the trade-in tax credit matters. Before signing, compare this total across dealers and, if you are financing, weigh it against your loan cost the same way the FTC suggests in its guide to financing or leasing a car.