How to read a buyer's order before you sign
The buyer's order lists every charge between the price you agreed on and the amount you'll finance. Here's each line explained, a worked Charlotte example where one pre-printed line costs $1,606, and the red flags to catch before you sign.
By the LotGauge team
What a buyer's order is, and why it matters
A buyer's order (also called a purchase agreement or bill of sale worksheet) lists the price of the car and every charge added to it, your trade-in and your down payment. If you finance through the dealer, its bottom line becomes the amount financed on your loan contract. It's the last chance to catch a number you didn't agree to before it's built into years of payments.
Ask for it before you go to the finance office, and take your time with it. The Consumer Financial Protection Bureau's advice is blunt: "Take time to review each detail of your contract," and if you're asked to sign a blank or partly filled-in form, "you should decline."
A worked example: a Charlotte buyer's order
Say you agreed on $26,500 for a used SUV in Charlotte, with a trade-in the dealer values at $9,000 that still has a $4,000 loan, and $3,000 down. Here's what the order shows:
Vehicle price: $26,500. Protection package (pre-printed): $1,295. Doc fee: $699. Highway use tax: $525 (North Carolina's 3% on the price minus the trade-in). Title and registration: $150 (an example; your state's fees will differ). Trade-in allowance: −$9,000. Payoff on your trade: +$4,000. Cash down: −$3,000. Balance to finance: $21,169.
At 8.81% APR for 60 months, that's $437.48 a month. Open this order in the calculator.
The protection package was never discussed. Cross it off and the balance drops to $19,874 and the payment to $410.72. That one line costs about $27 a month and $1,606 over the loan. See the order without it.
Line by line: what to check
The car itself. Check the VIN, year, model, trim and mileage against the car on the lot and the listing you saw. A different VIN or a lower trim on paper is a problem to fix before you sign.
Vehicle price. It should be exactly the number you negotiated, with no "market adjustment" or reconditioning charge added on a separate line.
Add-ons and pre-printed items. Paint protection, etching, nitrogen tires, tracking devices and "protection packages" are often pre-printed on the form or on a sticker next to the window sticker. The FTC notes that "you can usually buy the vehicle you want without any add-ons." Ask for any you didn't choose to be removed. See what dealer add-ons do to your payment.
Doc fee and other dealer fees. The documentation fee is the dealer's own charge. Some states cap it; many don't. Any other dealer fee ("dealer prep," "admin," "processing") should have a clear explanation, and you can negotiate the price to offset it.
Taxes. Make sure the tax is on the right amount. In most states, including North Carolina and Texas, a trade-in to the same dealer lowers the taxed amount. See how the trade-in credit works by state.
Government fees. Title, registration and plate fees are set by your state. If the total looks high, ask for the breakdown.
Trade-in allowance and payoff. The allowance should be the number you agreed to, and the payoff should match your lender's payoff quote. If you owe more than the trade is worth, that difference is being added to the new loan. See how dealers use trade-ins to hide numbers.
Down payment and rebates. Your cash down, any deposit you already paid and any rebate should each appear as a credit.
The financing numbers. If you finance, the contract must show the Truth in Lending terms: the APR, the finance charge (the dollar cost of borrowing), the amount financed and the total of payments. The amount financed should match the buyer's order balance, and the APR should match what you were told. If you brought a pre-approval, compare the two.
Warranty or "as is." On a used car from a dealer, the FTC's Buyers Guide on the window says whether the car has a warranty or is sold as is, and it "will override anything in your sales contract." Make sure the paperwork agrees with it.
Red flags
Blank lines or fields to be "filled in later." Totals that don't add up. A payment that went up between the sales desk and the finance office. An APR described as "estimated" or "pending approval" while you're asked to take the car home. A trade-in payoff that doesn't match your lender's quote. A promise ("we'll fix the scratch," "free oil changes") that isn't written anywhere. The FTC's advice: "Spoken promises are difficult to enforce. Ask the dealer to put all promises in writing."
Before you sign
1. Ask for the buyer's order in writing and add it up yourself, line by line. 2. Cross off anything you didn't agree to, and get a reprinted copy. 3. Compare the amount financed, APR and term with the contract. 4. Put the numbers in the car payment calculator; if your payment doesn't match the dealer's, ask what's different. 5. Don't leave without copies of everything you signed.
For how the total is built in the first place, see the out-the-door price guide.
Sources
Consumer Financial Protection Bureau, What should I know before I finalize a car or auto loan? and What is a Truth-in-Lending disclosure for an auto loan? Federal Trade Commission, Buying a Used Car (2023). North Carolina General Statutes, Chapter 105, Article 5A: Highway Use Tax. Experian, average used-car loan rates by credit score (Q2 2026). Checked October 2026. The order is an example; payments were calculated with LotGauge's calculator and are not offers.