To write a promissory note for a car sale, put the full names of both parties, the vehicle’s description and VIN, the loan amount, the interest rate, the payment schedule, the late-fee and default terms, and a security interest in the vehicle into a single signed document, then notarize it and record a lien on the title. That document turns a private payment arrangement into an enforceable debt and gives you a clear path to recover the car or the money if the buyer stops paying.
Pair the Note With a Bill of Sale
A promissory note is not a transfer of ownership. It creates and defines the debt: how much is owed, at what rate, on what schedule, with what consequences for missing a payment. The bill of sale is the separate document that records the transfer of the car from seller to buyer and states the purchase price. Private financed sales need both, signed at the same closing. Without the bill of sale, the buyer may struggle to register the car. Without the note, the seller has no enforceable repayment terms.
Required Terms to Put in the Note
Under the Uniform Commercial Code, a valid note must contain an unconditional promise to pay a fixed amount of money, be payable at a definite time or on demand, and identify who gets paid.1Legal Information Institute. UCC 3-104 – Negotiable Instrument That is the legal floor. A workable car note goes further and includes each of the following:
- Full legal names and addresses of borrower and lender, exactly as they appear on government-issued identification.
- Vehicle description: year, make, model, and the 17-character Vehicle Identification Number copied directly from the title or registration.
- Total sale price and the loan principal, which is the purchase price minus any down payment.
- Interest rate, written as both a number and a word to prevent alteration.
- Payment schedule: the amount of each installment, whether payments are monthly or biweekly, the day they are due, and the maturity date when the balance must reach zero.
- Late fees: a flat dollar amount or percentage charged after a specified grace period. State law limits these, so check your local rule before setting a figure.
- Where and how payments are delivered (bank account, mailing address, or electronic transfer).
- A security interest statement declaring that the vehicle is collateral and that the lender may repossess it upon default. This language is what makes the note secured rather than unsecured.
Blank spaces and vague language invite disputes. If a term is not written down, a court will either fill the gap with your state’s default rule or refuse to enforce that part of the agreement.
Setting the Interest Rate
Two separate rules squeeze the interest rate from opposite directions. From the top, every state caps what a private lender can charge. General maximums for unlicensed lenders start as low as 6% in some states and run above 20% in others, depending on the loan size and the lender’s status. Charging above the cap is usury, and penalties range from forfeiture of the excess interest to voiding the entire debt. Research your state’s usury statute before you pick a number.
From the bottom, the IRS pushes back against artificially low rates. If you charge less than the Applicable Federal Rate for the loan’s term, the IRS treats the shortfall as a below-market loan and imputes interest the lender must report as income, even though it was never collected.2Office of the Law Revision Counsel. 26 USC 7872 – Treatment of Loans With Below-Market Interest Rates The AFR changes monthly and is published by the IRS; use the rate in effect on the date the loan is made.3Internal Revenue Service. Applicable Federal Rates A limited exception applies to gift loans between individuals when total outstanding balances between the two people stay at or below $10,000 and the money is not used to buy income-producing assets.
Interest you actually receive is taxable and goes on Schedule B of your federal return, with or without a 1099-INT.4Internal Revenue Service. Topic No. 403, Interest Received A rate somewhere in the single digits usually keeps sellers safely between the two limits.
Default and Acceleration
The default section is where most of the lender’s leverage lives, and it is the part private sellers most often leave vague. At a minimum, define what counts as a default, how many days the borrower has to cure it, and what the lender can do if they do not.
An acceleration clause lets the lender demand the entire remaining balance at once if the borrower defaults. Without one, the lender can only chase each missed installment as it comes due. Most acceleration clauses are optional: the lender chooses whether to accelerate after a default, and the note should say whether written notice and a cure window are required before acceleration takes effect. If the borrower cures the default before the lender invokes the clause, the lender generally loses the right to call the balance due for that particular missed payment.
Spell out the other events that will count as default so there is no argument later. Common ones for a car loan include dropping insurance, selling the car without the lender’s consent, and letting the registration lapse.
Signing, Witnessing, and Notarizing
Both parties must sign for the note to take effect. The borrower’s signature creates the promise to pay; the lender’s signature confirms acceptance of the terms, including the obligation to release the lien when the debt is paid. A witness at signing adds protection: if the borrower later claims they were pressured or did not understand the terms, the witness can testify otherwise.
Notarization is not legally required in most states for a promissory note to be enforceable, but it is worth the small fee. The notary verifies each signer’s identity with photo ID and stamps the document. Notary fees vary by state and typically fall under $25 for a standard acknowledgment. In court, a notarized document is much harder to challenge than one resting on the parties’ word that the signatures are genuine. Each party should keep an original or certified copy once signing is done.
Record a Lien on the Title
Signing creates the debt. Recording a lien on the vehicle title is what actually protects the lender’s interest in the car. Without a recorded lien, the borrower could sell the vehicle or borrow against it a second time, and the seller would have no priority claim.
To record the lien, the lender submits a lien filing application to the state motor vehicle agency along with the existing title and a processing fee. Fee amounts vary by state. The agency then issues a new title showing the lender as lienholder, which blocks any transfer until the lien is released. Do this immediately after closing. Every week the lien is not on file is a week the borrower could dispose of the collateral.
If the note is unsecured because no lien was ever recorded, repossession is off the table. The lender’s only remedy becomes a lawsuit for the unpaid balance, with attorney fees, court costs, and the risk that the borrower has no collectible assets even after a judgment.
Require Insurance and Name the Lender as Loss Payee
A lender who finances a car has a direct stake in the condition of that car. If the vehicle is totaled and the borrower has no coverage, the collateral is gone and the security interest is worthless. Write a comprehensive and collision coverage requirement directly into the note for the life of the loan, and require the borrower to list the lender as loss payee on the policy. That way insurance proceeds go to the lender first if the vehicle is damaged or destroyed, and the insurer notifies the lender if the borrower cancels or lets the policy lapse. Make dropping coverage a default trigger that lets you demand reinstatement within a set number of days or accelerate the loan.
What You Can Do If the Borrower Stops Paying
On a secured car note, a lender generally has two paths after default: repossess the vehicle, sue for the money owed, or both.
Under the UCC adopted in every state, a secured creditor can take the collateral after default either through a court order or through self-help repossession, as long as the repossession happens without any breach of the peace. The repo agent cannot break into a locked garage, threaten violence, or take the car over the borrower’s physical objection. When peaceful repossession is not possible, the lender must go through the courts.
After repossession, the lender must sell the vehicle in a commercially reasonable manner, meaning the price, method, and timing are what a reasonable person would consider fair.5Legal Information Institute. UCC 9-610 – Disposition of Collateral After Default Written notice of the planned sale must go to the borrower first.6Legal Information Institute. UCC 9-611 – Notification Before Disposition of Collateral Sale proceeds are applied to the debt. If the sale falls short, the borrower owes the deficiency, and the lender can sue to collect it. If the sale brings in more than what is owed, the surplus goes back to the borrower.7Legal Information Institute. UCC 9-615 – Application of Proceeds of Disposition Used cars sold after repossession rarely cover the outstanding balance, so deficiency judgments are common.
One important limit: if the borrower is an active-duty servicemember who signed the note before entering military service, the Servicemembers Civil Relief Act bars repossession without a court order during that service, and the contract cannot be terminated for a pre-service or in-service breach without court approval.8Office of the Law Revision Counsel. 50 USC 3952 – Protection Under Installment Contracts for Purchase or Lease Self-help is not available in that situation.
Releasing the Lien and Keeping Records
When the borrower makes the final payment, the lender must sign a lien release and submit it to the state motor vehicle agency, which then issues a clean title in the borrower’s name. Most states set deadlines for how quickly the release must be filed, and missing them can expose the lender to liability. Give the borrower a written statement confirming the debt is satisfied.
Throughout the loan, keep a payment ledger showing the date and amount of each installment, how much went to principal versus interest, and the running balance. Issue a receipt after every payment. A spreadsheet is fine if it is updated consistently and backed up. If the deal ends up in small claims or civil court, those records are the primary evidence both sides will rely on, and the party with the better paper trail wins those arguments.