A promissory note does one main thing: it turns a loan into a written, legally enforceable promise to repay money on specific terms. The borrower (the “maker”) signs a document promising to pay a fixed amount to the lender (the “payee”), and that signature creates an obligation a court can enforce.1Legal Information Institute. Uniform Commercial Code 3-412 – Obligation of Issuer of Note or Cashiers Check Beyond recording that someone owes money, the note locks in the amount, the interest rate, the payment schedule, and what happens if the borrower stops paying, so neither side can later rewrite the deal from memory.
What a Promissory Note Locks In
The reason a promissory note is enforceable where a casual acknowledgment often isn’t comes down to specificity. A valid note sets out the terms a court would otherwise have to guess at.
- The principal amount being borrowed.
- The interest rate, and whether it’s fixed or variable. A note that says “with interest” but never names a rate invites a dispute.
- The repayment schedule — monthly installments, a single lump sum at the end, or a balloon payment where smaller payments lead up to one large final payment.
- The maturity date, meaning the specific calendar date the final payment is due.
- The date and place the note was issued, which establishes when the obligation began and whose law governs.
- The maker’s signature. Without it, there is no binding promise.
Most well-drafted notes also spell out a grace period before a payment counts as late (commonly a few days up to 30), a late fee, a default clause, and whether the borrower can pay the loan off early without penalty. If the note is silent on prepayment, the borrower generally can pay early, but putting it in writing avoids the argument.
How It Differs From an IOU
An IOU is a bare acknowledgment of debt: “I owe you $5,000.” It stops there. A promissory note goes further by setting the repayment plan, the interest, and the consequences of missing a payment. That extra detail is what gives a judge something to enforce. An IOU often leaves too many blanks for a court to fill in on its own.
A promissory note can also do something an IOU cannot: it can qualify as a “negotiable instrument” under the Uniform Commercial Code if it contains an unconditional promise to pay a fixed sum, names a specific payee (or is payable to the bearer), and is payable on demand or on a definite date.2Legal Information Institute. Uniform Commercial Code 3-104 – Negotiable Instrument A negotiable note can be sold or transferred, which is why mortgage loans move around on the secondary market.
Term vs. Demand, Secured vs. Unsecured
A term note has a fixed maturity date. The lender can’t call the full balance early unless the borrower defaults. Mortgages, car loans, and most business loans are structured this way.
A demand note has no set end date. The lender can require full repayment at any time by asking for it.3Legal Information Institute. Demand Note Demand notes show up often in lines of credit and informal loans between people who know each other. The flexibility runs both ways: the lender has more control, and the borrower lives with more uncertainty.
The other split is whether the note is backed by collateral. A secured note pledges a specific asset — a house, a car, business equipment — that the lender can seize if payments stop. That security usually buys the borrower a lower interest rate. An unsecured note relies entirely on the borrower’s promise and credit, so lenders charge more to accept the extra risk.
Where You’ll Actually See One
Promissory notes do work in more settings than most borrowers realize. In real estate, a mortgage closing involves two separate documents: the promissory note (your promise to repay) and the mortgage or deed of trust (which pledges the property as collateral for that promise). They work together but serve different legal functions.
Private loans between family members or friends are another common use, and probably where a written note does the most practical good. Putting the interest rate, schedule, and default terms on paper before any money changes hands forces both sides to agree on the deal in advance. Without that, personal loans have a way of ending relationships because each person remembers different terms.
Businesses use promissory notes for short-term working capital, vendor credit, and investor financing. Student loans — federal and private — rely on them. Companies sometimes issue notes to raise capital from investors, though those deals usually bring securities rules into play as well.
What the Note Does When Payments Stop
The note’s teeth show up at default. Most notes build in a grace period (commonly 10 to 15 days for commercial notes, sometimes up to 30) before a late fee applies. If the borrower catches up in that window, the default is cured and the loan continues.
If the borrower doesn’t catch up, the lender’s options depend on what the note says. Many notes contain an acceleration clause, which lets the lender declare the entire remaining balance due immediately rather than just the missed payment.4Legal Information Institute. Acceleration Clause A five-year installment plan can become a single lump-sum obligation overnight. Lenders generally must notify the borrower and give a brief window to cure first, and if the borrower catches up before the lender formally accelerates, the lender typically loses the right to invoke the clause.
If the borrower still doesn’t pay, the lender can sue to turn the note into a court judgment. A judgment unlocks collection tools the private contract alone doesn’t offer, like wage garnishment and bank account levies.
Secured notes come with an added remedy. After default, a secured lender can repossess the collateral through court action or, if it can be done without a confrontation, through self-help repossession.5Legal Information Institute. Uniform Commercial Code 9-601 – Rights After Default The lender sells the collateral and applies the proceeds to the debt. If the sale falls short, the borrower still owes the difference, called a deficiency balance, which the lender can chase in court.
What the Note Does When It Changes Hands
A promissory note doesn’t have to stay with the original lender. If it’s a negotiable instrument, the payee can transfer it, and the new holder steps into the lender’s shoes with full rights to collect.
There are two basic ways to transfer a note. A special endorsement names the next holder, similar to writing “Pay to the order of Jane Smith” on the back; only Jane can negotiate it from there.6Legal Information Institute. Uniform Commercial Code 3-205 – Special Indorsement; Blank Indorsement; Anomalous Indorsement A blank endorsement is just the payee’s signature with no named recipient, which turns the note into something anyone holding it can enforce.7Legal Information Institute. Blank Endorsement That’s the mechanism behind a mortgage servicer changing without your consent: the original lender endorsed and sold your note, and the buyer now has the right to collect.
Rules That Shape What a Note Can Do
State Interest Rate Caps
Every state has usury laws setting a ceiling on the interest a private lender can charge. There’s no single federal cap for consumer loans. Limits vary widely, from single digits in some states to above 30% in others. Exceeding the cap can let the borrower void the interest, collect penalties, or in some states have the entire note declared unenforceable. Checking your state’s maximum before setting the rate is the difference between a valid note and a worthless one.
IRS Rules for Private Loans
If you lend money to a friend or family member at little or no interest, the IRS treats the arrangement as a “below-market loan.” The difference between the rate you charged and the IRS minimum is treated as if you gave the borrower that amount as a gift and they paid it back to you as interest, meaning you may owe tax on interest you never actually received.8Office of the Law Revision Counsel. 26 USC 7872 – Treatment of Loans With Below-Market Interest Rates
The IRS minimum is the Applicable Federal Rate (AFR), published monthly. For January 2026, the annual AFR is 3.63% for short-term loans (three years or less), 3.81% for mid-term loans (three to nine years), and 4.63% for long-term loans (over nine years).9Internal Revenue Service. Rev Rul 2026-2 – Applicable Federal Rates for January 2026 Two exceptions matter for family loans: if your total loans to one person stay at or below $10,000, the imputed interest rules don’t apply at all; for loans between $10,000 and $100,000, imputed interest is capped at the borrower’s net investment income for the year, so a borrower with no investment income effectively owes nothing on this count.8Office of the Law Revision Counsel. 26 USC 7872 – Treatment of Loans With Below-Market Interest Rates
On the other side, if a lender forgives $600 or more of debt, the lender must file Form 1099-C, and the borrower generally has to report the canceled amount as taxable income.10Internal Revenue Service. About Form 1099-C, Cancellation of Debt
How Long a Note Stays Enforceable
A promissory note doesn’t last forever. Every state sets a statute of limitations for suing on a written note, generally running from 3 to 15 years, with most states in the 4-to-6-year range. Once the deadline passes, the lender loses the right to sue even if the debt is technically still owed. The clock usually starts at the last missed payment, or at the date of demand on a demand note. Making a partial payment or acknowledging the debt in writing can restart the clock in some states, which is worth knowing before making a “goodwill” payment on an old debt.
Consumer Credit Disclosures
When a promissory note involves consumer credit rather than a business or investment loan, the Truth in Lending Act may require the lender to disclose the APR, total finance charges, and repayment terms before signing. Most home-secured loans use a Loan Estimate and Closing Disclosure; reverse mortgages, home equity lines of credit, and certain manufactured housing loans use a separate Truth in Lending disclosure.11Consumer Financial Protection Bureau. What Is a Truth-in-Lending Disclosure for Certain Mortgage Loans These rules generally don’t reach purely private loans between individuals who aren’t in the business of lending, but someone making private loans often enough to look like a lender can get pulled in.