A promissory note is a written, legally binding document in which one party (the maker) promises to pay a specific sum of money to another party (the payee) either on a set date or whenever the payee demands it. Under the Uniform Commercial Code, it qualifies as a negotiable instrument when it contains an unconditional promise to pay a fixed amount, is payable to a named person or bearer, and is payable on demand or at a definite time.1Legal Information Institute. UCC 3-104 – Negotiable Instrument That negotiable status matters because it means the note can be sold or transferred, and new holders can enforce it independently of the original lender. Promissory notes show up in family loans, mortgages, student loans, and corporate financing, and the rules governing them carry real consequences for both sides.
What a Promissory Note Must Contain
A promissory note does not need to be long, but it does need to cover specific ground to hold up in court. Missing even one key element can make the note unenforceable or create ambiguity that a borrower could exploit later.
- Full legal names and contact information for the maker (borrower) and the payee (lender).
- The exact principal amount being loaned.
- The interest rate, whether it is fixed or variable, and how interest accrues (simple or compound).
- The repayment schedule: dates, frequency, and amounts, and whether the loan is paid in installments or as a lump sum.
- The maturity date by which the entire remaining balance is due.
- Late payment penalties and any increased interest rate that kicks in when payments are overdue.
- Prepayment terms, including whether the borrower can pay off the loan early and whether a prepayment penalty applies.
- Default provisions describing what counts as a default and what the lender can do, including any acceleration clause.
- The governing state law that controls disputes.
One element people overlook is consideration, which is the legal term for what the borrower actually receives in exchange for their promise to repay. Usually consideration is just the loan proceeds. If a note is signed without any exchange of value, though, the borrower can raise lack of consideration as a defense to avoid payment. UCC Section 3-303 preserves this defense even for negotiable instruments, so a signed note is not automatically bulletproof.
The maker must sign and date the note for it to be enforceable. The payee’s signature is generally not required, because the note is a one-way promise. Both parties should keep copies, and the original should stay with the payee. Physical possession of the original matters for enforcement: if the lender loses it, pursuing a claim gets significantly harder. Notarization is not legally required for the note itself, but it makes forgery claims much harder to run. For secured notes tied to real estate, the security instrument (the mortgage or deed of trust) typically must be notarized and recorded with the county, even though the note itself does not.
Promissory Note vs. IOU vs. Loan Agreement
People confuse these three constantly, and the differences matter if the deal ever goes sideways. An IOU is the simplest and the weakest. It acknowledges a debt exists (“I owe you $5,000”) and little else. No repayment terms, no interest rate, no consequences for nonpayment. That makes it difficult to enforce if the borrower stops cooperating.
A promissory note sits in the middle. It is a one-directional promise from borrower to lender, but it spells out the amount owed, the interest rate, the repayment schedule, and what happens on default. Because it can qualify as a negotiable instrument under the UCC, it enjoys stronger legal protections than an IOU.
A loan agreement is the most comprehensive of the three. It is a mutual contract in which both sides make commitments: the lender agrees to provide funds under certain conditions, and the borrower agrees to repay under detailed terms. Loan agreements typically address collateral, representations and warranties, financial covenants, and events that would let either party modify the arrangement. When large sums are involved, when multiple lenders or co-signers participate, or when the deal has complex conditions, a loan agreement provides protections a standalone note does not.
Common Types of Promissory Notes
Promissory notes take different forms depending on what the loan is for and how much protection the lender wants.
Secured vs. Unsecured
A secured note is backed by a specific asset the lender can seize on default. The collateral might be real estate, a vehicle, equipment, or a financial account. Because the lender has a fallback, secured notes typically carry lower interest rates. If the borrower stops paying, the lender can repossess or foreclose without relying solely on a court judgment.
An unsecured note relies entirely on the borrower’s promise and creditworthiness. Nothing is pledged. If the borrower defaults, the lender must sue, obtain a judgment, and then use collection tools like wage garnishment or bank levies. That added risk usually means a higher interest rate.
Installment vs. Demand
An installment note requires regular payments (monthly, quarterly, or on some other schedule) until the debt is paid off. Each payment typically covers both principal and interest. Car loans, mortgages, and personal loans usually work this way because both sides know exactly what to expect.
A demand note has no fixed schedule or maturity date. The full balance becomes due whenever the lender formally asks for it. If the note is silent on timing, the UCC treats it as payable on demand by default. Demand notes appear in lines of credit and some business lending arrangements where the lender wants flexibility. Borrowers should understand that the entire balance can be called at any time.
Real Estate Notes
In a home purchase, the promissory note and the mortgage (or deed of trust, depending on the state) are separate documents that work together. The note is the debt: it sets the amount owed, the interest rate, the monthly payment, and the consequences of default. The mortgage or deed of trust is the security instrument that gives the lender the right to foreclose. The note creates the debt; the mortgage protects the lender’s ability to collect it. If the borrower defaults, the lender can also sue on the note for a money judgment regardless of what happens with the property.
Master Promissory Notes
A master promissory note covers multiple loan disbursements over time rather than a single lump-sum loan. Federal student loans are the most common example. You sign one master promissory note at the beginning, and that note governs every subsequent disbursement for up to ten years. You do not sign a new note each semester. The upside is administrative simplicity. The downside is that you are agreeing in advance to the terms of loans you have not yet received.
Interest Rates, Usury Limits, and Family Loans
Interest is the lender’s compensation and the borrower’s cost. The rules around what you can charge and how the IRS treats it are areas where people routinely make mistakes, especially on private loans.
Every state sets a maximum interest rate for private loans, known as the usury limit. There is no single federal cap on interest rates for all consumer lending. State limits vary widely, and the consequences of exceeding them range from forfeiture of all interest to voiding the loan entirely. A few states impose criminal penalties. Before setting a rate on a private note, check the usury limit in the state whose law governs the note. This matters most for loans between individuals, where no institutional compliance department is catching mistakes before signing.
Lending to a family member or friend at zero interest or an artificially low rate triggers IRS scrutiny. Under 26 U.S.C. ยง 7872, if a loan charges interest below the Applicable Federal Rate published monthly by the IRS, the agency treats the forgone interest (the difference between what was charged and the AFR) as though it was actually paid.2Office of the Law Revision Counsel. 26 USC 7872 – Treatment of Loans With Below-Market Interest Rates For a gift loan between family members, the forgone interest is treated as a gift from lender to borrower and simultaneously as interest income received by the lender. The lender ends up owing income tax on interest they never actually collected.
There is a de minimis exception: if total outstanding loans between two individuals stay at or below $10,000, Section 7872 does not apply, unless the borrower uses the money to buy income-producing assets like stocks. For loans between $10,000 and $100,000, the imputed interest is capped at the borrower’s net investment income for the year. Above $100,000, no cap applies. As of April 2026, the short-term AFR is 3.59%, the mid-term rate is 3.82%, and the long-term rate is 4.62% (compounded annually).3Internal Revenue Service. Rev. Rul. 2026-7 – Applicable Federal Rates for April 2026 Which rate applies depends on the loan term: short-term covers loans up to three years, mid-term covers three to nine years, and long-term covers anything beyond nine years.
Any person who pays $10 or more in interest during a calendar year must file Form 1099-INT with the IRS and provide a copy to the recipient.4Internal Revenue Service. Instructions for Forms 1099-INT and 1099-OID Private lenders often skip this because they think of the 1099-INT as a bank form. It is not. If you lend a friend $50,000 at 5% and receive $2,500 in interest during the year, you are required to file a 1099-INT. Even when the interest received is under $10 and no 1099 is required, the lender must still report the income on their tax return.
How Promissory Notes Get Transferred
Because a properly drafted note qualifies as a negotiable instrument, it can be sold or transferred to someone other than the original lender. This happens constantly in the mortgage industry, where banks bundle notes and sell them to investors, but it can happen with any negotiable note.
Transfer works through endorsement, much like endorsing a check. A special endorsement names the specific person or entity receiving the note, and only that person can negotiate it further. A blank endorsement consists of just the payee’s signature without naming a new recipient, which makes the note payable to whoever physically holds it. A blank-endorsed note functions like cash: anyone who has it can enforce it.
The most important consequence of transfer is the holder in due course doctrine. Under UCC Section 3-302, a person who acquires a note for value, in good faith, and without knowledge of any problems with it becomes a holder in due course.5Legal Information Institute. UCC 3-302 – Holder in Due Course That status is powerful because it strips away most defenses the borrower might have had against the original lender. If you signed a note because the original lender made oral promises they didn’t keep, you can raise that against the original lender but generally not against a holder in due course who bought the note without knowing about those promises. Many borrowers get caught off guard here.
What Happens When the Borrower Defaults
Default occurs when the borrower fails to meet the obligations spelled out in the note. The most common trigger is a missed payment, but default can also result from violating other terms, like failing to maintain insurance on collateral or letting a lien attach to pledged property.
Most well-drafted notes include an acceleration clause, which lets the lender declare the entire remaining balance due immediately after a default. Without this clause, the lender can only sue for the missed payments, not the full amount. Acceleration usually does not happen automatically. The lender must choose to invoke it, and if the borrower cures the default before the lender acts, the lender may lose the right to accelerate.6Legal Information Institute. Wex – Acceleration Clause In the mortgage context, some jurisdictions let borrowers undo an acceleration by catching up on missed payments and covering the lender’s costs before foreclosure is finalized.
After declaring default, the lender typically sends a formal demand letter with the amount owed and a payment deadline. If the borrower does not pay, the lender files suit. The note itself serves as the primary evidence of the debt. Because it is a written contract with clear terms, these cases tend to move faster than disputes over oral agreements, but they still go through the court system.
If the court rules for the lender, a judgment establishes the debt as a legal obligation. That opens up collection tools: wage garnishment, bank account levies, and liens on the borrower’s property. For secured notes, the lender can also pursue the collateral directly, repossessing and selling it to satisfy the debt. Any shortfall remaining after the sale (a deficiency) can still be pursued as an unsecured claim against the borrower, depending on the state.
How Long the Lender Has to Sue
Lenders do not have unlimited time to enforce a note. Under UCC Section 3-118, a lawsuit to enforce a note payable at a definite time must be filed within six years of the due date, or within six years of an accelerated due date if the lender invoked an acceleration clause. For demand notes, the six-year clock starts when the lender actually makes a demand for payment. If the lender never makes a demand and no principal or interest has been paid for ten continuous years, the right to enforce the note expires entirely.7Legal Information Institute. UCC 3-118 – Statute of Limitations Some states have adopted different time periods, so the UCC’s six years is a starting point rather than a universal rule.