What Is a Promissory Note? Types, Templates & State Rules
A promissory note is a written, signed promise to repay a specific amount of money by a specific date. It's one of the most common legal documents in business — used for personal loans, business lending, seller financing, and more. This guide explains what promissory notes are, the different types, what must be included to make one valid, and how rules vary by state.
Table of Contents
- Definition and Purpose
- Types of Promissory Notes
- 8 Required Elements
- Promissory Note vs. Loan Agreement
- State-Specific Rules
- When You Need a Promissory Note
- How to Create One
- Frequently Asked Questions
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Definition and Purpose
A promissory note is a legal document in which one party (the maker or borrower) promises in writing to pay a specific sum of money to another party (the payee or lender) under defined terms.
Unlike a loan agreement — which is a bilateral contract with obligations on both sides — a promissory note is primarily a one-sided commitment: the borrower's promise to pay. Because of this, promissory notes are considered negotiable instruments under the Uniform Commercial Code (UCC). This means they can be transferred or sold to a third party, who then has the right to collect.
Common uses:
- Personal loans between friends or family
- Business-to-business lending
- Seller financing when buying a business or real estate
- Student loans (many federal student loans are formalized with a Master Promissory Note)
- Equipment financing
- Bridge loans before formal bank financing closes
The key benefit: a promissory note creates a formal, enforceable record. Lenders can sue on the note. Borrowers have certainty about repayment terms. Both parties have written evidence if the relationship sours.
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Types of Promissory Notes
Demand Promissory Note
Repayment is due whenever the lender demands it. There's no fixed repayment date. This type is common for informal personal loans. Risk for the borrower: the lender can demand full repayment at any time with little or no notice.
Installment Promissory Note
The most common type for business lending. The borrower repays in regular installments (monthly, quarterly) over a set period. Each payment covers interest and a portion of the principal. This is how most commercial loans and car loans work.
Interest-Only Promissory Note
The borrower pays only interest for a defined period (e.g., 12 months), then pays the full principal in a lump sum (balloon payment). Used in real estate and bridge lending.
Zero-Interest Promissory Note
The borrower repays only the principal with no interest. Common for family loans. Warning: The IRS has rules about minimum interest rates for family loans. If you lend money at below-market rates, the IRS may treat the "forgiven" interest as a gift, which can have gift tax implications. As of 2026, the Applicable Federal Rate (AFR) for short-term loans is around 4.5%.
Secured vs. Unsecured Promissory Note
A secured note is backed by collateral — real estate, equipment, inventory, or other assets. If the borrower defaults, the lender can seize the collateral. An unsecured note relies only on the borrower's promise to pay. Unsecured notes carry higher risk for lenders and typically carry higher interest rates.
Convertible Promissory Note
Used in startup financing. The lender provides money as a loan, but the loan converts to equity (stock) when the startup raises a qualifying funding round. This is the standard instrument for seed-stage startup investments.
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8 Required Elements
For a promissory note to be legally enforceable, it must include:
1. Names and Addresses of Both Parties Full legal names (not nicknames) and current addresses for both the maker (borrower) and payee (lender).
2. Principal Amount The exact dollar amount being borrowed. Write it out in words and numbers to prevent disputes.
3. Interest Rate State the annual interest rate. If the note is interest-free, explicitly state "0% interest." Include whether interest is simple or compound. Most states cap the maximum interest rate — charging above it is usury and may void the interest provision entirely.
4. Repayment Schedule When is repayment due? Installment amounts and dates, or the demand date. Be specific: "12 monthly installments of $850 beginning April 1, 2026" is better than "monthly payments over one year."
5. Maturity Date The final date when all outstanding amounts must be paid.
6. Collateral (if secured) Describe any collateral in detail. For a secured note, you'll typically also need a separate security agreement and UCC-1 financing statement filed with the state.
7. Default and Remedies What constitutes a default (typically missed payments after a grace period)? What happens when the borrower defaults — acceleration of the full balance, late fees, lender's right to sue?
8. Governing Law and Signatures The state whose laws govern the note, and signatures from the maker (and notarized if required by state law).
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Promissory Note vs. Loan Agreement
People often confuse these two documents. Here's when to use each:
| Feature | Promissory Note | Loan Agreement |
|---|---|---|
| Parties | Borrower signs only | Both parties sign |
| Negotiability | Transferable (UCC Article 3) | Generally not transferable |
| Length | Short, 1–3 pages | Long, detailed |
| Best for | Simple lending, family loans | Complex commercial loans |
| Lender obligations | Not specified | Often detailed (disbursement schedule, representations) |
| Covenants | Not typical | Common (financial reporting, restrictions) |
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State-Specific Rules
Usury Laws
Every state has maximum interest rate limits (usury laws) for different types of loans:
- California: 10% per year for most private loans; commercial loans can exceed this if both parties agree in writing
- New York: 16% civil usury; 25% is criminal usury
- Texas: Generally 18% per year for consumer loans; commercial loans are less restricted
- Florida: 18% for loans under $500,000; 25% for loans over $500,000
Charging above the legal maximum can make the entire note unenforceable or void the interest provision, depending on the state.
Statute of Limitations
The time period to sue on an unpaid promissory note varies by state:
- California: 4 years (written contracts)
- New York: 6 years
- Texas: 4 years
- Florida: 5 years
The clock typically starts on the maturity date or the date of the first missed payment.
Notarization Requirements
Most states don't require notarization for a promissory note to be valid. However:
- Notarization is required if the note is secured by real property in many states
- Notarization makes it easier to record the document and adds evidentiary value
- Some states require notarization for notes above certain dollar thresholds
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When You Need a Promissory Note
Use a promissory note when:
- Lending money to a friend or family member (even $1,000 — especially $1,000)
- Providing seller financing for a business sale
- Taking out a short-term business loan from an investor
- One partner is lending money to the partnership
- You're documenting a previously informal lending arrangement
You don't need a promissory note for:
- Accounts receivable (use an invoice)
- Employment compensation owed (use an employment agreement)
- Equity investments (use a SAFE or stock purchase agreement)
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How to Create One
Three approaches, in order of cost:
- Business attorney: Best for loans over $50,000, secured loans, or complex terms. Expect $300–$800 for a simple note, more for secured arrangements.
- Online legal service (LegalZoom, Rocket Lawyer): $50–$150, includes state-specific customization.
- Free generator: Use our Promissory Note Generator to create a customized, state-specific promissory note in minutes.
After creating the note, both parties should receive a signed copy. For secured notes, file a UCC-1 financing statement with your state's Secretary of State to perfect the security interest.
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Related Guides
- Partnership Agreements: What to Include & Why
- Small Business Legal Checklist: 15 Must-Have Documents
- Consulting Agreements: Everything You Need to Know
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Frequently Asked Questions
Does a promissory note need to be notarized?
In most states, a promissory note does not need to be notarized to be legally valid. The maker's (borrower's) signature is sufficient. However, notarization is required if the note is secured by real estate in many states, and it's always good practice for larger amounts because it adds evidentiary weight and makes the document harder to repudiate.
Can I write a promissory note myself?
Yes. A promissory note doesn't require an attorney to be legally valid. As long as it contains the required elements (principal, interest rate, repayment terms, signatures), a handwritten or typed promissory note is enforceable. That said, missing required elements — or including illegal terms like above-usury interest rates — can render the note unenforceable. Using a template or generator ensures you don't miss anything.
What happens if the borrower doesn't pay?
If the borrower defaults, the lender can demand immediate repayment of the full outstanding balance (acceleration), charge late fees as specified in the note, report the default to credit bureaus (if applicable), pursue collection through a collections agency, or sue in civil court to obtain a judgment. If the note is secured, the lender can also foreclose on or repossess the collateral.
Is a promissory note the same as an IOU?
No. An IOU is an informal acknowledgment of debt — it rarely includes repayment terms, interest, or legal language. A promissory note is a formal legal instrument with specific terms, making it far more enforceable. An IOU may be admissible as evidence in a debt dispute, but suing on a promissory note is much more straightforward.
How long is a promissory note valid?
A promissory note is valid until it is paid in full or the statute of limitations expires. The limitations period (typically 4–6 years, depending on the state) begins running when the debt becomes due — either at the maturity date or at the date of the first missed installment payment. After the limitations period expires, the note may still exist but the lender can no longer sue to enforce it.
Last updated: March 2026