A promissory note is a signed written promise to repay a specific amount of money on specific terms, and its job is to make that promise legally enforceable. It names the borrower (the “maker”) and the lender (the “payee”), fixes the loan amount, the interest rate, and the repayment schedule, and sets out what happens if payments stop.1Legal Information Institute. Uniform Commercial Code 3-103 – Definitions Once signed, the maker is legally obligated to pay according to those terms, and the lender can take the note to court if they don’t.2Legal Information Institute. Uniform Commercial Code 3-412 – Obligation of Issuer of Note or Cashiers Check
What a Promissory Note Does That an IOU Doesn’t
An IOU is a written acknowledgment that one person owes money to another. It says “I owe you $5,000” and stops. A promissory note goes further: it spells out the interest rate, the exact repayment plan, what counts as a missed payment, and when the final payment is due. That specificity is what makes it enforceable. An IOU leaves too many blanks for a judge to fill in; a properly drafted note doesn’t.
When a note meets certain structural requirements under the Uniform Commercial Code, it also becomes a “negotiable instrument,” meaning the lender can transfer it to someone else who then has the right to collect.3Legal Information Institute. Uniform Commercial Code 3-104 – Negotiable Instrument That’s the mechanism behind mortgages being sold on the secondary market, and it’s why the company collecting your payments today may not be the one you originally borrowed from.
What Has To Be in the Note
A promissory note doesn’t need to look fancy, but it does need to include certain information to hold up in court. Missing any of these can make the note unenforceable, or at least give the borrower grounds to challenge it.
- The principal amount being borrowed, stated exactly.
- The interest rate, and whether it’s fixed or variable. A note that says “with interest” but never specifies a rate invites a dispute.
- The repayment schedule: monthly installments, a single lump sum at the end, or a balloon structure where smaller payments lead to one large final payment.
- The maturity date, meaning the specific calendar date when the final payment is due (unless the note is a demand note, discussed below).
- The date and place the note was issued, which establishes when the obligation began and which state’s laws govern it.
- The maker’s signature. Without it, there is no binding promise.
Well-drafted notes also address late fees, default, and what happens if either side has to sue. Grace periods before a payment is considered late typically run from a few days to 30 days, depending on what the parties negotiate. Prepayment is worth spelling out too: some notes let the borrower pay off the debt early with no penalty, others charge a fee. If the note is silent, the borrower can generally pay early, but putting it in writing avoids arguments.
Terms You’ll See on the Note
Demand vs. Term
A term note has a fixed maturity date. The borrower knows exactly when the final payment is due, and the lender can’t demand full repayment early unless the borrower defaults. This is the standard structure for mortgages, car loans, and most business financing.
A demand note has no set maturity date. The lender can call in the full balance at any time by requesting payment.4Legal Information Institute. Demand Note Demand notes show up in lines of credit and informal loans between people who know each other. The flexibility cuts both ways: the lender has more control, but the borrower faces uncertainty about when the money could be called back.
Secured vs. Unsecured
A secured note is backed by collateral, a specific asset the lender can seize if the borrower stops paying. In a mortgage, the collateral is the house. In a car loan, it’s the vehicle. The collateral gives the lender a fallback, which usually translates into a lower interest rate for the borrower.
An unsecured note has no collateral behind it. The lender is relying entirely on the borrower’s promise and creditworthiness. If the borrower defaults, the lender has to sue and then chase the borrower’s general assets. Because the lender takes on more risk, unsecured notes typically carry higher rates.
Where Promissory Notes Show Up
Promissory notes appear in more situations than most people realize. The most familiar is real estate. When you get a mortgage, you actually sign two documents: the promissory note is your promise to repay the loan, and the mortgage (or deed of trust, depending on the state) is a separate document that pledges the property as collateral securing that promise.
Private lending between family members or friends is another common use, and this is where a written note does the most practical good. It forces both sides to agree on the interest rate, the payment schedule, and the consequences of missed payments before any money changes hands. Without that document, personal loans have a way of damaging relationships because each side remembers the deal differently.
Businesses use promissory notes for short-term working capital loans, vendor credit, and investor financing. Federal and private student loans rely on them too. Some corporate financing structures involve companies issuing notes to raise capital from investors, though those deals usually pull in securities regulations as well.
What Happens If Payments Stop
When a borrower misses a payment, the note’s default provisions take over. Most notes build in a grace period, commonly 10 to 15 days for commercial notes and sometimes up to 30, before a late fee applies. If the borrower catches up within that window, the default is cured and the loan continues normally.
If the borrower doesn’t catch up, the lender’s next move depends on what the note says. Many notes include an acceleration clause, which lets the lender declare the entire remaining balance due immediately, not just the missed payment.5Legal Information Institute. Acceleration Clause That turns what might have been a five-year installment plan into a single lump-sum obligation overnight. Lenders generally must notify the borrower and give a brief window to cure before pulling the trigger, 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 and obtain a court judgment. A judgment converts the private contractual debt into a court order, which opens up collection tools like wage garnishment and bank account levies.
Secured notes give the lender another option: seizing and selling the collateral. After a default, a secured lender can repossess through court action or, if it can be done without a confrontation, through self-help repossession.6Legal Information Institute. Uniform Commercial Code 9-601 – Rights After Default The lender sells the collateral and applies the proceeds to the outstanding debt. If the sale doesn’t cover the full balance, the borrower still owes the difference, called a deficiency balance, which the lender can pursue separately.
How the Lender Can Change
A negotiable promissory note can be transferred, and the new holder steps into the original lender’s shoes with full rights to collect. There are two main ways this happens. A special endorsement names the specific person receiving the note, similar to writing “Pay to the order of Jane Smith” on the back; after that, only Jane Smith can negotiate it further.7Legal Information Institute. Uniform Commercial Code 3-205 – Special Indorsement; Blank Indorsement; Anomalous Indorsement A blank endorsement is just the payee’s signature on the back with no named recipient, which turns the note into a bearer instrument that whoever holds it can enforce.8Legal Information Institute. Blank Endorsement
This is the mechanism behind your mortgage servicer changing without you signing anything new. The original lender endorsed the note and sold it, and the buyer now has the legal right to collect your payments.
Rules That Catch Private Lenders Off Guard
If you’re the one drafting a promissory note, a few outside rules can quietly undo an otherwise valid document.
Below-market interest. If you lend money to a friend or family member and charge little or no interest, the IRS may treat the arrangement as a “below-market loan.” The difference between what you charged and the IRS minimum rate can be imputed to you as interest income you have to pay tax on, even though you never actually received it.9Office of the Law Revision Counsel. 26 USC 7872 – Treatment of Loans With Below-Market Interest Rates The minimum is the Applicable Federal Rate, published monthly by the IRS and varying by whether the loan is short-, mid-, or long-term.10Internal Revenue Service. Rev Rul 2026-2 – Applicable Federal Rates for January 2026 Two carve-outs help small family loans: loans totaling $10,000 or less to one person are exempt, and loans between $10,000 and $100,000 cap imputed interest at the borrower’s net investment income for the year.
Usury caps. Every state sets a maximum interest rate for private lenders, and the range across states is wide. Some cap private loan interest in the single digits, others allow rates above 30%. Charging above your state’s ceiling can void the interest, expose you to penalties, or in some states make the entire note unenforceable. Check your state’s cap before setting a rate.
Statute of limitations. Promissory notes don’t stay enforceable forever. Every state sets a deadline by which the lender must sue to collect. For written notes, the window generally runs 3 to 15 years depending on the state, with most falling in the 4-to-6-year range. The clock typically starts on the date of the last missed payment, or for a demand note, when the lender demands payment. A partial payment or a written acknowledgment of the debt can restart the clock in some states, which is worth knowing before making a “goodwill” payment on an old debt.
Consumer disclosure rules. The Truth in Lending Act requires lenders to disclose the annual percentage rate, total finance charges, and repayment terms before the borrower commits. For most home-secured loans, that comes as a Loan Estimate and Closing Disclosure; for reverse mortgages, HELOCs, and certain manufactured housing loans, a separate Truth in Lending disclosure is used.11Consumer Financial Protection Bureau. What Is a Truth-in-Lending Disclosure for Certain Mortgage Loans These rules generally don’t apply to a one-off loan between individuals, but if you make private loans often enough that a regulator could call you a lender, they may apply to you.