Promissory Note
A written, signed promise by one party (the maker) to pay a specified sum of money to another party (the payee) at a defined time or on demand.
While straightforward in theory, many businesses fail to actively track obligations tied to this concept - often resulting in missed deadlines, unintended renewals, penalties, or loss of contractual rights.
US Law · For business owners and foundersWhat is a Promissory Note?
A promissory note is a negotiable financial instrument in which the "maker" (borrower) makes an unconditional written promise to pay a fixed amount of money to the "payee" (lender) on demand or at a specified future date, with or without interest. It is a standalone payment promise and does not need to be part of a broader loan agreement, though it often is.
Under UCC Article 3, a negotiable promissory note must: (1) be in writing and signed by the maker; (2) contain an unconditional promise to pay; (3) be for a fixed amount of money; (4) be payable on demand or at a definite time; and (5) be payable to order or to bearer. A note that meets these requirements can be transferred to a third party, who becomes a "holder in due course" with strong enforcement rights.
A loan agreement is a comprehensive contract addressing the full terms of a lending relationship - covenants, events of default, security, representations. A promissory note is a simpler instrument focused on the payment obligation. Many commercial loans use both: a detailed loan agreement supplemented by a promissory note that evidences the borrower's payment obligation.
In practice, many teams rely on a contract expiry tracking system to stay on top of dates and obligations tied to clauses like this.
Key Elements
Principal Amount
The face amount the maker promises to pay.Interest Rate
Fixed or variable rate applied to the outstanding principal.Maturity Date
The date when the note is due in full, or "on demand" if no fixed date.Acceleration Clause
Allows the payee to demand full repayment immediately upon a default event.Endorsement / Negotiability
The payee can endorse and transfer the note to a third party, who becomes the new holder with collection rights.Real-World Example
A startup borrows $250,000 from an angel investor, evidenced by a convertible promissory note. The note bears 5% annual interest and converts to equity at the next qualified financing round. If no financing occurs within 18 months, the investor may demand repayment of principal plus accrued interest.
This is a convertible promissory note - a common startup financing tool. The investor has a written payment promise, the right to convert to equity on favorable terms, and a backstop right to demand cash repayment. The note is the central document governing the financial obligation.
This is why many businesses adopt automated deadline tracking to ensure no critical dates are missed before they pass.
Sample Clause Language
Promissory Note - Payment ObligationWatch Out For
Oral loans are difficult to enforce
A promissory note creates a written record of the loan. Oral loans are enforceable in theory but nearly impossible to prove in practice. Always use a note for any loan above a trivial amount.Negotiable notes can end up with unexpected holders
A payee can sell the note to a third party without the maker's consent. The new holder may be a "holder in due course" with stronger rights than the original payee, able to enforce the note even against certain defenses.Don't let promissory note deadlines catch you off guard
Key dates tied to promissory notes - renewal windows, expiry cutoffs, notice periods - can easily slip through the cracks when tracked manually. Missing them triggers automatic extensions, penalties, or lost rights. ExpiryEdge tracks every critical deadline and sends automated reminders before they're due - so nothing slips.
Instead of relying on spreadsheets or manual follow-ups, a centralized renewal reminder system ensures every deadline is visible, tracked, and actioned automatically.
How to Use This in Your Favor
Pair a promissory note with a loan agreement for larger transactions
For significant borrowing, use both a comprehensive loan agreement (covering covenants, defaults, security) and a promissory note (the clean payment obligation). The note is easily transferable; the loan agreement stays with the parties.Include an acceleration clause
An acceleration clause allows the holder to demand full immediate repayment upon a default event, preventing a defaulting borrower from continuing to make minimal installment payments while the underlying business deteriorates.Related Terms
Frequently Asked Questions
What is a convertible promissory note?
A convertible note is a promissory note that can be converted into equity (typically preferred stock) upon specified triggering events - most commonly a qualified financing round. It is widely used in early-stage startup financing.
Does a promissory note need to be notarized?
Not generally for it to be legally binding. However, notarization may be required if the note is secured by real property or required for recording purposes. Check applicable state law.