A promissory note for a car is a written, legally binding promise from a buyer to repay money borrowed to purchase a vehicle. It sets out the loan amount, interest rate, payment schedule, and consequences of nonpayment. It does not transfer ownership of the car — that’s the job of the title. These notes appear most often in private sales where one person finances the deal for another, but dealerships and banks use the same instrument.
Written correctly, the note creates an enforceable debt. Written loosely, it creates an argument.
What the Note Has to Contain
Under the Uniform Commercial Code, adopted in some form by every state, a promissory note qualifies as a “negotiable instrument” when it contains an unconditional promise to pay a fixed amount of money, is payable on demand or at a set date, and imposes no obligations beyond the payment itself.1Legal Information Institute. UCC 3-104 – Negotiable Instrument For a car loan, an enforceable note should include:
- Full legal names and addresses of the borrower and lender.
- The principal amount in U.S. dollars.
- The annual interest rate. Every state caps this through usury laws, and charging above the limit can void the interest or the entire note depending on the jurisdiction.
- The payment schedule — monthly installments, a lump sum, or another arrangement the parties agree to.
- The maturity date by which the full balance must be paid.
- The vehicle’s make, model, year, and Vehicle Identification Number, so there is no ambiguity about which car is involved.
- Signatures and dates from both parties.
Late fees deserve their own line. State the fee amount and how many days after the due date it applies. Many states cap late charges at a percentage of the missed installment and require a minimum grace period, so the number has to comply with local law.
One detail private lenders often miss: because a properly drafted note is a negotiable instrument, the lender can transfer it. The new holder steps into the original lender’s position and can collect the remaining payments.1Legal Information Institute. UCC 3-104 – Negotiable Instrument If you’re the borrower, your obligation follows the note, not the person who wrote you the check.
Secured or Unsecured
The biggest structural choice is whether the note is secured by the car. The consequences fall almost entirely on the lender.
An unsecured note is backed only by the borrower’s word. If payments stop, the lender cannot touch the vehicle. The path to recovery runs through a lawsuit, a judgment, and then collection tools like wage garnishment.2Consumer Financial Protection Bureau. What Should I Do If Im Sued by a Debt Collector or Creditor Months of work, no guarantee the borrower has assets to collect against. For financing a car, an unsecured note is almost never the right call.
A secured note uses the vehicle as collateral. Alongside the note, the borrower signs a security agreement granting the lender a security interest in the car. To make that interest enforceable against the outside world, the lender must be listed as a lienholder on the vehicle’s certificate of title.3Legal Information Institute. UCC 9-311 – Perfection of Security Interests in Property Subject to Certain Statutes, Regulations, and Treaties This is called “perfecting” the lien, and skipping it is the most expensive mistake a private lender can make.
Perfection means taking the signed title and security agreement to the state motor vehicle agency and paying a recording fee, typically $5 to $33 depending on the state. Some states use electronic lien-and-title systems; in others, the lender holds the physical title until the loan is paid. Either way, the notation puts every future buyer on notice that the car cannot be sold free and clear until the debt is satisfied.
If the borrower defaults on a secured note, the lender can repossess without going to court, as long as the repossession does not involve a “breach of the peace.”4Legal Information Institute. UCC 9-609 – Secured Partys Right to Take Possession After Default No physical confrontation, no threats, no breaking into a locked garage. Towing a car from a public street when nobody is home is generally fine. Cutting a padlock on a fence is not.
How the Note Fits With the Title and Bill of Sale
A private car sale with financing produces three documents. Confusing them causes real problems.
- The promissory note is the financing document. It records the loan amount, interest rate, payment schedule, and default terms. It creates the debt but transfers nothing.
- The bill of sale is the receipt. It proves the sale happened, records the purchase price, and identifies buyer and seller. Most states require it for registration.
- The certificate of title is the ownership document, issued by the state. On a financed sale, it also lists the lender as lienholder, blocking a transfer until the loan is paid.
A promissory note without a title transfer leaves the buyer driving a car still legally owned by the seller. A title transfer without a note leaves the lender with no written record of the debt.
Insurance on a Secured Note
When a lender holds a security interest, the car’s condition determines the value of the collateral. Most secured notes require the borrower to carry comprehensive and collision coverage for the life of the loan and to name the lender as “loss payee.” That designation sends insurance proceeds to the lender first if the car is totaled, with any remainder going to the borrower.
If coverage lapses, the lender can buy force-placed insurance and charge it back to the borrower.5Consumer Financial Protection Bureau. What Is Force-Placed Insurance Force-placed policies cost significantly more than ordinary coverage and protect only the lender’s financial interest. They generally exclude liability, so the borrower could still be driving without the minimum insurance state law requires. Keeping your own policy is always cheaper.
Interest Rate Rules Private Lenders Miss
Beyond state usury caps, family and friend loans have a federal wrinkle. If the note charges less than the applicable federal rate (AFR) published monthly by the IRS, the difference between the rate charged and the AFR is treated as “imputed interest” — essentially a deemed gift from lender to borrower, with the lender owing tax on interest income they never received.6Office of the Law Revision Counsel. 26 USC 7872 – Treatment of Loans With Below-Market Interest Rates
For March 2026, the short-term AFR (loans of three years or less) is 3.59% with annual compounding, the mid-term rate (three to nine years) is 3.93%, and the long-term rate (over nine years) is 4.72%.7Internal Revenue Service. Revenue Ruling 2026-6 – Applicable Federal Rates for March 2026 These rates change every month. Check the IRS table for the month you originate the loan.
There is a carve-out: if the total loan is $10,000 or less, the imputed interest rules do not apply to gift loans between individuals.6Office of the Law Revision Counsel. 26 USC 7872 – Treatment of Loans With Below-Market Interest Rates Above that amount, a zero-interest or below-market loan to a relative creates phantom taxable income. Charging at least the AFR avoids the problem.
If any portion of the debt is later forgiven, the canceled amount generally counts as taxable income to the borrower, and a lender who cancels $600 or more may need to file Form 1099-C.8Internal Revenue Service. About Form 1099-C, Cancellation of Debt
Does Federal Truth-in-Lending Law Apply to a Private Note
Almost never. The Truth in Lending Act requires lenders to disclose the APR, total finance charges, and a full payment schedule before closing, but it only reaches “creditors” who extend consumer credit more than 25 times a year.9eCFR. 12 CFR 1026.2 – Definitions and Rules of Construction A person financing a single car sale to a friend or relative is nowhere near that threshold. Dealerships and banks routinely cross it, which is why their disclosure forms look the way they do. Even when federal law doesn’t require the disclosures, spelling out the APR, total interest, and payment amounts in your note protects both sides and makes the terms harder to dispute later.
What Happens on Default
The first step is a written demand letter. State the exact amount past due, any late fees accrued, and a clear deadline to cure. Send it by certified mail so delivery is documented. This isn’t only a courtesy; it builds the paper trail for any later legal action.
If the borrower cannot or will not pay, the lender’s next move depends on whether the note is secured. Without collateral, the lender files suit. Small claims court is often the fastest route for smaller balances, with state caps typically running between $5,000 and $20,000. A judgment opens the door to wage garnishment, subject to federal limits on how much of a paycheck can be taken.10Office of the Law Revision Counsel. 15 USC 1673 – Restriction on Garnishment
With a secured note, the lender can repossess and then sell the car in a “commercially reasonable” manner, typically through an auction or private sale reflecting fair market conditions.11Legal Information Institute. UCC 9-610 – Disposition of Collateral After Default The borrower must get advance notice of the sale.12Legal Information Institute. UCC 9-611 – Notification Before Disposition of Collateral
If the sale brings less than the total debt plus repossession and sale costs, the borrower owes the shortfall, called a deficiency balance.13Legal Information Institute. UCC 9-615 – Application of Proceeds of Disposition The lender can sue for a judgment on that remaining amount. If the sale brings more, the surplus goes back to the borrower. A borrower who believes the car sold for an unreasonably low price — sold quietly to a friend, for example, or without any real effort to find buyers — can challenge the deficiency in court. A lender who cuts corners on the commercial-reasonableness standard risks losing the right to collect the shortfall.