What this document is
A used car sale agreement is the written backbone of a private car sale. Beyond the price, it records the details that matter with vehicles specifically: the registration number, engine and chassis numbers, the odometer reading on the day of sale, whether any finance is still owed on the car, and who is responsible for transferring the registration into the buyer's name at the transport office.
Cars are the most expensive thing most people ever sell privately — a used pickup in Thailand can easily change hands for THB 350,000. At that scale, a chat conversation is not enough. The agreement, the payment records, and the transfer paperwork together protect the buyer from hidden finance or a car that cannot be re-registered, and protect the seller from fines and liability for a car that is no longer theirs.
When to use it
- Selling your car directly to another person rather than trading it in with a dealer.
- Buying a used car from a private seller found through a marketplace or word of mouth.
- Taking a deposit to hold the car while the buyer arranges the rest of the money.
- Selling a car that still has finance owing, where part of the price goes to settle the loan before transfer.
- Selling a car to a relative or friend at a discounted price — the paperwork matters just as much.
- Agreeing a sale where the buyer pays in two or three installments before taking the registration.
When not to use it
- The car is subject to a court dispute, seizure, or unclear ownership — resolve that with professional help first.
- You are buying from or selling to a dealer, where the dealer's own contract and consumer rules usually apply.
- The 'seller' cannot produce the registration book or proof they own the car — walk away rather than paper over it.
- Cross-border sales involving export, import duty, and re-registration in another country.
Information you will need
- Full names, ID numbers, and addresses of seller and buyer
- Vehicle make, model, year, and color
- Registration (license plate) number and the province or region of registration
- Engine number and chassis/VIN number as shown in the registration book
- Odometer reading on the date of sale
- Whether any finance or loan is still owed on the vehicle, to whom, and the payoff amount
- Sale price, deposit already paid (if any), and the payment schedule and method
- Date and place of handover of the car, keys, and registration book
- Who handles and pays for the name transfer at the transport office, and the deadline for doing it
- Known faults, accident history the seller is aware of, and items included (spare tire, tools, service book)
Clauses included
Parties
Identifies seller and buyer with ID details, confirming the seller is the registered owner or has legal authority to sell.
Vehicle identification
Records plate number, engine number, and chassis number exactly as they appear in the registration book, so the contract matches the physical car.
Odometer and condition
States the mileage at sale and lists known faults and accident history, with the buyer confirming inspection and any test drive.
Price and payment
Sets the full price, any deposit already received, and how and when the balance is paid, with each payment acknowledged in writing.
Outstanding finance
Declares whether the car secures any loan, and if so, how and when it will be paid off so the registration book is released for transfer.
Registration transfer
Assigns responsibility and a deadline for transferring the registration into the buyer's name, and splits the transfer fees between the parties.
Handover and risk
Fixes the moment the car, keys, and documents pass to the buyer, and confirms the buyer bears road risk from that point.
As-is sale
Confirms the buyer accepts the car in its inspected condition, without covering faults the seller deliberately concealed.
Fines and liabilities
Allocates responsibility for traffic fines, tax, and tolls incurred before versus after handover.
What the guided builder asks
- 1PartiesWho is providing the money?
- 2AmountHow much is being provided?
- 3RepaymentWill it be repaid once or in installments?
- 4InterestWill interest apply?
- 5Late paymentWhat happens if a payment is late?
- 6Additional termsAdditional terms (optional)
- 7ReviewClauses included
- 8ExportExport PDF · Export DOCX
How to sign it
Sign the agreement when the deposit or first payment is made, not at handover only — that way the deal terms are locked in before large sums move. Both parties sign every page if the agreement runs longer than one page, and each keeps an original.
On handover day, note the final odometer reading, sign a receipt for the final payment, and photograph the car, the odometer, and the signed documents together. If the buyer pays by transfer, keep the slip with the agreement; the combination proves the full price was actually paid.
Complete the registration transfer as soon as possible after payment — in many countries both parties either attend the transport office or the seller signs a set of transfer forms and a power of attorney. Until the transfer is done, fines and liability may still land on the seller, so the deadline in the agreement is worth enforcing.
Common mistakes
- Handing over the car and registration book before the final payment has cleared into your account.
- Not checking the payoff amount with the finance company yourself — sellers sometimes underestimate what is still owed.
- Copying the engine and chassis numbers from an advert instead of from the registration book and the car itself.
- Leaving the transfer 'for later' with no deadline, then receiving the previous owner's traffic fines for months.
- Failing to record the odometer reading, which makes mileage disputes impossible to resolve.
- Accepting a personal cheque and releasing the car before it clears.
Frequently asked questions
Can I sell a car that still has finance owing on it?
Often yes, but the loan must be settled before the registration can transfer, because the finance company usually holds the registration book. The common pattern is that part of the buyer's payment goes directly to the finance company to close the loan, and the agreement should spell this out with the exact payoff amount and dates.
What happens if the buyer never transfers the registration?
Fines, tax notices, and even liability for accidents can keep coming to the registered owner — you. That is why the agreement should set a firm transfer deadline and, where the local system allows it, why sellers often insist on doing the transfer together on payment day rather than trusting the buyer to do it later.
Is a deposit on a car refundable if the buyer backs out?
That depends entirely on what you agree in writing. A common arrangement is that the deposit is forfeited if the buyer withdraws without cause, and refunded in full if the seller withdraws or the car turns out not to match its description. Record the rule in the agreement or in a separate deposit agreement.
How do I prove I actually paid for the car?
Pay by bank transfer where possible and keep the slip, referencing the plate number in the transfer note. For any cash portion, have the seller sign a dated receipt at the moment the money is handed over. Keep these together with the signed agreement — the contract alone does not prove payment.
Should the buyer inspect the car before signing?
Always, and ideally with a mechanic for anything expensive. The agreement should state that the buyer inspected and test-drove the car, because the as-is clause is only fair — and only likely to hold up — if the buyer had a genuine chance to check the vehicle.
Do we need a witness or a lawyer for a private car sale?
Most private car sales are completed without a lawyer, and a witness is generally optional. For high-value cars, unresolved finance, or a seller who is not the registered owner, paying for an hour of legal advice before signing is money well spent.
This template provides general document assistance and is not a substitute for legal advice. Legal requirements vary by jurisdiction, transaction type, and individual circumstances.