A promissory note for a car is a written, legally binding promise to repay money borrowed to buy a vehicle. It shows up most often in private sales where one person finances the deal for another, though dealerships and institutional lenders use them too. The note records what’s owed, the interest rate, and the payment schedule. It does not transfer ownership of the car.
What the Note Has to Contain to Be Enforceable
Under the Uniform Commercial Code, which every state has adopted in some form, 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 doesn’t impose obligations beyond payment itself.1Legal Information Institute. UCC 3-104 – Negotiable Instrument For a car loan, the note should spell out:
- 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 where you live.
- The payment schedule, whether monthly installments, a lump sum, or something else.
- The maturity date by which the full balance is due.
- The car’s make, model, year, and Vehicle Identification Number, so there is no ambiguity about which vehicle secures the loan.
- 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 you agree to has to comply with local law.
One consequence many private lenders overlook: because a properly drafted note is a negotiable instrument, the lender can transfer it to someone else.1Legal Information Institute. UCC 3-104 – Negotiable Instrument The new holder steps into the original lender’s shoes. If you’re the borrower, your obligation follows the note, not the person who first lent you the money.
Secured or Unsecured: The Choice That Matters Most
The single biggest decision in structuring a car promissory note is whether to secure it with the vehicle. The consequences of getting it wrong fall almost entirely on the lender.
Unsecured Notes
An unsecured note is backed only by the borrower’s word. If payments stop, the lender cannot touch the car. The only path to recovery is filing a lawsuit, winning a judgment, and using that judgment to pursue remedies like wage garnishment.2Consumer Financial Protection Bureau. What Should I Do If Im Sued by a Debt Collector or Creditor That process takes months, costs money, and offers no guarantee the borrower has wages or assets worth chasing. For a car loan, an unsecured note is almost never the right call.
Secured Notes
A secured note uses the vehicle itself as collateral. The borrower signs a security agreement granting the lender a security interest in the car. To make that interest enforceable against everyone else, 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 one of the most expensive mistakes a private lender can make.
The process means taking the signed title and security agreement to the state motor vehicle agency and paying a recording fee, typically between $5 and $33 depending on the state. Some jurisdictions use electronic lien-and-title systems where the lienholder is noted digitally. In others, the lender holds the physical title until the loan is paid off. Either way, the notation puts every potential buyer on notice that the car cannot be sold free and clear until the debt is satisfied.
The Other Documents You Need Alongside the Note
A private car sale with financing produces three separate documents, and confusing them creates real problems. Each has a different legal function:
- 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 a sale happened, documents the price, and identifies buyer and seller. Most states require it for registration.
- The certificate of title is the ownership document. Issued by the state, it names the legal owner and, when the loan is secured, shows the lender as lienholder.
You need all three. 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.
The Interest Rate Rule Private Lenders Miss
When family or friends finance a car sale, the IRS pays attention to the interest arrangement. If the loan 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. It’s essentially a deemed gift from the lender to the borrower, and the lender owes tax on interest income they never actually received.4Office 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%.5Internal Revenue Service. Revenue Ruling 2026-6 – Applicable Federal Rates for March 2026 The rates change every month, so 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 don’t apply to gift loans between individuals.4Office of the Law Revision Counsel. 26 USC 7872 – Treatment of Loans With Below-Market Interest Rates Above that, a zero-interest or low-interest loan to a relative creates phantom taxable income for the lender. Charging at least the AFR avoids the problem.
On the borrower’s side, if any portion of the debt is later forgiven, the canceled amount generally counts as taxable income. A lender who cancels $600 or more may need to report it on Form 1099-C.6Internal Revenue Service. About Form 1099-C, Cancellation of Debt
Insurance on a Secured Note
When a lender holds a security interest in a car, the vehicle’s condition affects the value of the collateral. Most secured notes require the borrower to carry comprehensive and collision insurance for the life of the loan and name the lender as loss payee. If the car is totaled or badly damaged, insurance proceeds go to the lender first to cover the outstanding balance. The borrower gets whatever is left.
If the borrower lets insurance lapse, the lender can buy force-placed insurance and charge the cost back.7Consumer Financial Protection Bureau. What Is Force-Placed Insurance Force-placed policies cost significantly more than regular coverage and protect only the lender’s financial interest. They typically exclude liability coverage, meaning the borrower could still be driving without the state-required minimum. Keeping your own policy in place is always cheaper.
Does Truth in Lending Apply to Private Car Notes?
Almost never. The federal Truth in Lending Act requires lenders to disclose the APR, total finance charges, and a full payment schedule before closing, but it only applies to creditors who extend consumer credit more than 25 times per year.8eCFR. 12 CFR 1026.2 – Definitions and Rules of Construction A person financing one car sale to a friend or relative doesn’t come close.
Dealerships and institutional lenders easily clear the 25-transaction line, which is why standardized disclosure forms show up at every lot. Even when federal law doesn’t require it, spelling out the APR, total interest cost, and payment amounts in your note protects both sides and makes the terms harder to dispute later.
What Happens if the Borrower Defaults
On a secured note, the lender can repossess the car directly, without a lawsuit, as long as the repossession doesn’t involve a breach of the peace.9Legal Information Institute. UCC 9-609 – Secured Partys Right to Take Possession After Default No physical confrontation, no threats, no breaking into a locked garage. A repo agent who tows the car from a public street when the borrower isn’t there is generally fine. One who cuts a padlock on a fence is not.
After taking the car, the lender must sell it in a commercially reasonable manner, usually through auction or a private sale that reflects fair market conditions.10Legal Information Institute. UCC 9-610 – Disposition of Collateral After Default The lender must send the borrower advance notice before the sale.11Legal Information Institute. UCC 9-611 – Notification Before Disposition of Collateral
Here is where borrowers get blindsided. If the car sells for less than the total debt, the borrower still owes the difference, called a deficiency balance, plus any repossession and sale costs.12Legal Information Institute. UCC 9-615 – Application of Proceeds of Disposition Owe $12,000, the car auctions for $3,500, repossession costs run $150, and the deficiency is $8,650. The lender can then sue for a judgment on that balance.
If the sale brings in more than the total debt plus costs, the lender must return the surplus.12Legal Information Institute. UCC 9-615 – Application of Proceeds of Disposition A borrower who believes the lender sold the car for an unreasonably low price, to a friend or without any real effort to find buyers, can challenge the deficiency in court. The sale has to be commercially reasonable, and a lender who cuts corners on that standard risks losing the right to collect the shortfall.