What is a Promissory Note?
A promissory note is a written, legally binding promise by one party (the maker) to pay a specified amount of money to another party (the payee), under specified terms including interest rate and repayment schedule.
A promissory note is a written legal instrument in which one party — the maker (or promisor) — makes an unconditional written promise to pay a definite sum of money to another party — the payee — either on demand or at a specified future date. It is signed by the maker and constitutes a binding financial obligation enforceable in court.
Promissory notes are foundational documents in lending: every mortgage, student loan, and most personal and business loans are documented with a promissory note.
Required Elements of a Promissory Note
For a promissory note to be legally enforceable, it typically must include:
- Names of parties — Identification of the maker (borrower) and payee (lender)
- Principal amount — The exact sum being borrowed
- Interest rate — The rate at which interest accrues, if any (APR or simple interest)
- Repayment terms — Payment schedule (monthly, lump sum, on demand)
- Maturity date — When the full balance must be paid
- Consequences of default — What happens if the maker fails to pay
- Signature of the maker — Required; payee signature is optional in most jurisdictions
If any essential element is missing, the note may be unenforceable or treated as an informal IOU rather than a negotiable instrument.
Types of Promissory Notes
Demand promissory note: The payee can demand repayment at any time. There is no fixed maturity date. Common in informal personal loans.
Installment promissory note: Repayment occurs in regular installments (monthly payments) over a set period — the structure used in mortgages and auto loans.
Interest-bearing promissory note: Specifies a stated interest rate. The maker owes the principal plus accumulated interest.
Non-interest-bearing (zero-interest) promissory note: No stated interest rate; maker repays only the principal. Common in family loans or certain business contexts — though the IRS may impute interest if rates are below the Applicable Federal Rate (AFR).
Secured vs. unsecured:
- Secured: Backed by collateral (e.g., a mortgage note is secured by the property). If the maker defaults, the lender can seize the collateral.
- Unsecured: No collateral. The lender's only remedy on default is a lawsuit to collect the judgment.
Promissory Notes in Common Transactions
| Transaction | Role of Promissory Note |
|---|---|
| Mortgage | Defines the personal repayment obligation; separate from the deed of trust |
| Student loans | Federal promissory note (MPN) signed at origination |
| Personal loan | Formalizes the repayment terms between individuals |
| Small business loan | Primary documentation of the debt obligation |
| Seller financing | Documents the payment terms when a seller finances the buyer directly |
Negotiable Instrument Status
Under the Uniform Commercial Code (UCC), a promissory note may qualify as a negotiable instrument if it is unconditional, payable in a fixed amount of money, payable to order or bearer, and signed by the maker. A negotiable promissory note can be transferred to a third party — which is why your mortgage lender may sell your loan to another bank; the promissory note travels with the sale.
Promissory Note vs. IOU vs. Loan Agreement
| Document | Legal Strength | Detail Level |
|---|---|---|
| Promissory note | Enforceable legal instrument | Moderate |
| IOU | Informal acknowledgment of debt | Minimal |
| Loan agreement | Detailed contract with all terms | Highest |
A promissory note is stronger than an IOU but less comprehensive than a full loan agreement — it documents the core payment obligation without all the ancillary provisions of a complete contract. For larger loans, attorneys often create both.