Reading a car purchase contract: a line-by-line walkthrough before you sign

By the time you're sitting at the finance manager's desk with a stack of paperwork, you've spent hours in the building, agreed on numbers, and are mostly hoping you can leave with the keys. That's exactly the wrong moment to skim. Here's what every line on a typical buyer's order means, in the order you'll see it.

Top of the contract — vehicle identification

• VIN — should match the car you test-drove. Verify against the door jamb sticker.
• Year, make, model, trim — should match exactly. Watch for “XLT” when you negotiated “Limited,” which we have seen.
• Mileage — for a new car this should be under 50 miles. For used, this should match the listing.

Selling price section

• MSRP — the manufacturer's number. Reference only.
• Discount / dealer concession — what they're taking off MSRP for you.
• Selling price (net) — what you agreed to pay for the vehicle. This is your negotiated number. It should match what you walked in with, to the dollar.
• Optional equipment / dealer-installed accessories — should be zero unless you specifically asked for accessories. If there's a line here for floor mats at $400, that's a stacked add-on.

Trade-in section

• Gross trade-in allowance — what they're crediting you for your old car. Verify against the appraisal.
• Trade-in payoff — the balance on your old loan, paid off by the dealer on your behalf.
• Net trade equity — the difference between the two. This is what actually reduces your new loan.

Tax base and government fees

• Sales tax — should be calculated on (selling price minus trade-in allowance) in most states. If it's calculated on the full selling price, ask why.
• Title fee — a real government charge. Small (~$20–$75 typically).
• Registration / license — varies by state, usually under $400.
• Documentation fee — the dealer's processing charge. Verify against the state average for your state.

Back-end products section (this is the danger zone)

If you declined all back-end products, every line in this section should be zero. If you see a line for an extended warranty, GAP, a tire-and-wheel plan, paint protection, theft protection, or anything else — stop. Either you agreed to it and forgot, or it shouldn't be there.

Every back-end product is opt-in. None of them get added by default. If one appears that you didn't approve, that's a contract change, not a typo.

Financing section

• Amount financed — total selling price plus tax, fees, and any back-end products, minus your down payment and trade equity.
• APR — your interest rate. Should match (or beat) the rate you were pre-approved for by your bank or credit union. If it's higher, ask why and decline if the explanation isn't compelling.
• Term — number of months. Common terms are 60, 72, 84. Longer terms lower the payment and dramatically increase total interest paid.
• Total monthly payment — should match what was agreed. If it doesn't, work backward to find which line drifted.

Lease-specific lines (if applicable)

• Capitalized cost — the lease equivalent of the selling price. Negotiate this just like a purchase price.
• Cap cost reduction — your down payment plus any trade equity, applied to reduce the cap cost.
• Residual — the projected value of the car at lease end, set by the manufacturer. Not negotiable.
• Money factor — the lease equivalent of an interest rate, expressed as a tiny decimal. Multiply by 2,400 to get the equivalent APR. If your money factor times 2,400 is higher than current new-car APRs, you're being overcharged.

More on how to negotiate each of those lease lines in the lease-specific guide.

What to do when something is wrong

Stop. Don't initial that page. Calmly point at the line and ask, “Can we fix this before I sign?” The finance manager will either correct it on the spot (most common), tell you a story about why it can't be changed (rare; ask for the sales manager), or walk you back to the floor (usually the deal can still be saved, just with a new buyer's order). The leverage in this conversation is yours: you're one signature from a deal they can't easily close with anyone else this week. Use it politely.