A car purchase agreement is a written contract between you and the seller that documents the sale and protects both parties
A car purchase agreement (also called a bill of sale or purchase contract) is the legal record that you own the car after money changes hands. It lists the vehicle details, the price, the condition, and who is responsible for what. Without one, you have no proof of purchase if a dispute arises, and your state's DMV may not process the title transfer without it.
The agreement does not have to be fancy or come from a lawyer. Many states accept a straightforward one-page form filled out by hand. What matters is that it covers the essential facts and is signed by both you and the seller. If you buy from a dealer, they will provide their own agreement; if you buy from a private seller, you will need to create one or use a template.
Key Takeaways
- A car purchase agreement must include the vehicle identification number (VIN), the sale price, the condition of the car, and the signatures of both buyer and seller.
- The agreement should state whether the car is sold "as-is" or with any warranty, and who pays for repairs or inspections before the sale closes.
- You need a signed agreement before you hand over money or the seller hands over the keys, because it is your only proof of the transaction.
- Your state's DMV requires the agreement (or a bill of sale form) to process the title transfer into your name.
The vehicle details that must be in the agreement
Start with the car itself. Write down the full vehicle identification number (VIN) — the 17-character code on the driver's side dashboard or door jamb. Include the year, make, model, and color. Add the odometer reading at the time of sale. These details prevent confusion later if either party claims the wrong car was sold or the mileage was misrepresented.
Note the current registration status and whether the title is clear (no liens from a lender or creditor). If the seller still owes money on the car, the lender's name and the payoff amount should be in the agreement, along with a statement that the seller will pay off the loan before handing over the title. If the seller does not pay off the loan, you could inherit the debt.
Describe the condition of the car in plain language: "runs and drives," "needs new tires," "has dent on passenger door," or whatever is true. This protects you if the seller later claims you damaged the car, and it protects the seller if you later claim something was broken when you bought it.
The price, payment method, and timing
Write the total sale price in both numbers and words — for example, "$8,500 (eight thousand five hundred dollars)" — to prevent disputes over what was agreed. State the payment method: cash, check, bank transfer, or another form. If you are paying in installments, list each payment amount and due date.
Include the date and time the sale is final. This matters because it determines who owns the car if something happens between signing and delivery — for example, if the car is damaged in a parking lot the day after you sign but before you pick it up. Most agreements make the sale final when the buyer receives the keys and the seller receives payment.
If either party is putting down a deposit before the final sale, state the deposit amount, when it is due, and what happens to it if the deal falls through. For example: "Buyer pays $1,000 deposit on [date]. If buyer backs out, deposit is forfeited. If seller backs out, deposit is returned in full."
Condition of the car and who pays for repairs
Decide whether the car is sold "as-is" or with a warranty. "As-is" means you are buying the car in its current condition, and the seller is not responsible for repairs after the sale closes. Most private sales are as-is. Write this clearly: "Buyer purchases vehicle as-is, with no warranty or may provide of condition."
If the seller is offering a warranty — for example, "seller warrants that the engine runs without issue for 30 days" — write exactly what is covered and for how long. Be specific about what "runs without issue" means. Does it include the transmission? The air conditioning? A vague warranty creates disputes.
If you are having the car inspected by a mechanic before you buy it, state who pays for the inspection and who pays for any repairs the mechanic finds. For example: "Buyer may have vehicle inspected by mechanic of buyer's choice at buyer's expense. If inspection reveals repairs needed, buyer and seller will negotiate repair costs before sale is final." This prevents the seller from claiming they did not know about a problem.
Title transfer and registration responsibility
State who is responsible for transferring the title to your name at the DMV. In most private sales, the seller is responsible for signing the title over to you, and you are responsible for taking it to the DMV to register it in your name. Write: "Seller will sign title over to buyer. Buyer will register vehicle with [state] DMV within [number] days of purchase."
If the seller needs to pay off a loan before the title can be transferred, set a important date — for example, "Seller will pay off loan and provide clear title to buyer within 10 days of sale." If the seller misses the important date, you need to know what happens: does the buyer get their money back, or does the buyer wait?
Some states require the seller to provide a bill of sale form in addition to the title. Check your state's DMV website to see what forms are required. If your state requires a specific form, use that form instead of writing your own agreement.
Signatures, dates, and contact information
Both the buyer and the seller must sign and date the agreement. Print both names clearly and include a phone number and address for each party. If either party is a business (a dealer or a fleet company), include the business name and the name and title of the person signing on behalf of the business.
Make at least two copies — one for you and one for the seller. Keep your copy with your car documents. If you lose it, you will have a hard time proving you own the car if a dispute arises later.
Some states allow electronic signatures on purchase agreements. If you are buying from someone out of state or online, ask whether they will sign electronically or whether they need a printed copy mailed to them. Do not hand over money until you have a signed agreement in your hands.
Where to find a template or form
Your state's DMV website often has a bill of sale form you can read and print. Search "[your state] DMV bill of sale" to find it. If your state does not have an official form, you can use a generic template from a legal document site or a consumer website. The template does not have to be state-specific as long as it covers the basics: VIN, price, condition, signatures, and date.
If you are buying from a dealer, they will provide their own purchase agreement. Read it carefully before you sign. Dealer agreements often include additional terms about financing, trade-ins, and warranties. Do not sign anything you do not understand. Ask the dealer to explain any clause that is unclear.
If you are buying from a private seller and neither of you has a template, you can write the agreement on a blank piece of paper. It does not have to be typed or fancy. As long as it includes the vehicle details, the price, the condition, and both signatures, it is legally valid in most states.
Frequently Asked Questions
Do I need a lawyer to write a car purchase agreement?
No. A straightforward one-page agreement that you and the seller both sign is legally valid in most states. A lawyer is useful only if the sale is complicated — for example, if the seller still owes money to a lender, or if you are buying a car with a salvage title or flood damage. For a straightforward private sale, a template is enough.
What if the seller will not sign an agreement?
Do not buy the car. A seller who refuses to sign an agreement is a red flag. They may be hiding something about the car's history, or they may plan to claim later that they did not agree to the sale. A signed agreement protects both of you, so any honest seller will sign one.
Can I use a text message or email instead of a printed agreement?
A text or email exchange where both parties confirm the details and agree to the sale can work as evidence, but it is not as strong as a signed written agreement. If a dispute ends up in court, a printed agreement with both signatures is much easier to defend. Use a printed agreement if possible.
What happens if I lose the purchase agreement after I buy the car?
You still own the car, but you have lost your proof of purchase. If the seller later claims they did not agree to the sale, or if there is a dispute over the condition or price, you will have a harder time proving your side. Keep your copy in a safe place with your title and registration.
Does the purchase agreement replace the title?
No. The purchase agreement is proof that you bought the car. The title is the legal document that proves you own it. You need both. After you sign the purchase agreement, the seller signs the title over to you, and you take the title to the DMV to register the car in your name.