Promissory note

A promissory note is a written, signed, unconditional promise by one party — the maker — to pay a definite sum of money to another party — the payee — either on demand or at a fixed or determinable future date.

It is the simplest form of debt instrument. Where a loan agreement sets out the full commercial relationship between lender and borrower, a promissory note does one thing: it evidences the promise to pay, in a form the law treats specially.

That special treatment is the point. Where a note meets the statutory requirements, it is a negotiable instrument — transferable to a new holder who may acquire better rights than the original payee had. No ordinary contract works that way.

This page describes general principles. Requirements differ by jurisdiction, and specific instruments should be reviewed by a qualified lawyer.

The essential elements

Most jurisdictions derive their rules from a common lineage — the English Bills of Exchange Act 1882 across the Commonwealth, and Article 3 of the Uniform Commercial Code in the United States. The requirements are broadly consistent.

ElementRequirementWhy it mattersIn writingMust be a written documentOral promises are not negotiable instrumentsSigned by the makerSignature or authorised markEstablishes the promise and the promisorUnconditional promiseNo conditions attached to paymentA conditional promise is not negotiableSum certain in moneyA definite amount, in currencyGoods, services or variable amounts fail the testPayable on demand or at a determinable timeEither immediately callable or at a set dateAn indefinite date destroys negotiabilityPayable to order or to bearerNames a payee, or is payable to whoever holds itThis is what makes it transferable

If any element fails, the document is generally not a negotiable instrument. It may still be perfectly enforceable as an ordinary contract — the promise does not evaporate — but it loses the transferability and procedural advantages that make notes useful.

Negotiability and the holder in due course

A negotiable note can be transferred by endorsement and delivery, or by delivery alone if payable to bearer. The transferee becomes the holder and can enforce the note in their own name.

A transferee who qualifies as a holder in due course — broadly, someone who took the note for value, in good faith, and without notice that it was overdue or defective — is protected against most disputes between the original parties.

The distinction that follows is important, and is common to most systems even where the terminology differs:

• Personal defences generally do not work against a holder in due course. These include failure of consideration, breach of the underlying contract, or fraud in inducing the maker to sign.
• Real defences generally do work against anyone. These typically include forgery, incapacity, duress, illegality of the instrument itself, and material alteration.

The practical effect is that a maker who signs a note and later has a dispute with the original payee may still have to pay a subsequent holder, and pursue their dispute separately. This is precisely what makes notes financeable — a lender can buy or take security over a note without inheriting the seller's commercial disputes.

Promissory note compared to other instruments

Promissory noteLoan agreementIOUBill of exchangeNatureA promise to payA contract governing the loanAn acknowledgement of debtAn order to a third party to payPartiesTwo — maker, payeeTwo — lender, borrowerTwoThree — drawer, drawee, payeeNegotiableYes, if requirements metNoNoYes, if requirements metTypical lengthOne or two pagesMany pagesA few linesOne pageContains covenants, conditionsRarelyYesNoNo

An IOU merely acknowledges that money is owed. It is evidence of debt but contains no promise to pay at a specified time, so it is not negotiable.

A bill of exchange is an instruction from one party to another to pay a third — the structure behind cheques and much trade finance. A promissory note is a promise by the signer themselves.

In practice, promissory notes and loan agreements are frequently used together: the agreement carries the covenants, security provisions and representations, and the note evidences the payment obligation in negotiable form.

Types of note

• Demand note — payable whenever the holder demands. Common in shareholder and related-party lending.
• Term (time) note — payable on a fixed date.
• Instalment note — payable in scheduled instalments, usually with an acceleration clause.
• Secured note — references collateral, with the security itself created by a separate charge or mortgage.
• Unsecured note — relies on the maker's promise alone.
• Non-negotiable note — marked "pay to X only", which deliberately removes transferability.
• Convertible note — a note that may convert into equity on defined events, widely used in early-stage financing.

What a note usually contains

• Principal amount and currency
• Interest rate, calculation basis and day count convention
• Payment schedule, or demand terms
• Maturity date
• Place and method of payment
• Acceleration clause — making the entire balance immediately due on default
• Default interest and late charges
• Prepayment terms
• Reference to any security document
• Governing law and jurisdiction
• Date, place of execution, and the maker's signature
• Witnessing or notarisation where required locally

The acceleration clause matters more than its length suggests. Without it, a lender facing a defaulting borrower on an instalment note may only be able to sue for instalments as they fall due, rather than for the whole balance at once.

Practical points that cause problems

• Conditional language destroys negotiability. "I promise to pay $10,000 after the harvest is sold" is conditional. The note may still be enforceable as a contract, but it is no longer a negotiable instrument.
• Stamp duty. Many jurisdictions require notes to be stamped, and an unstamped instrument may be inadmissible in court or attract penalties before it can be admitted. This is a routine and avoidable failure.
• The original document is the instrument. Unlike an ordinary contract, where a copy usually suffices, rights in a negotiable instrument attach to the original. Losing it creates real procedural difficulty.
• Alterations must be initialled. Material alteration without consent can discharge the maker entirely.
• Limitation periods. For demand notes, when the limitation clock starts — on execution or on demand — differs by jurisdiction, and getting it wrong can extinguish an otherwise good claim.
• Electronic notes. Because negotiability historically depends on physical possession, electronic equivalents require a legal concept of "control" over a unique record. Some jurisdictions have adopted frameworks for electronic transferable records; many have not. Check local law before relying on a purely electronic note.

Operational notes for lenders

• Keep originals in controlled safe custody, with a register recording location, movement and status.
• Record endorsements and transfers contemporaneously, not retrospectively.
• Cancel and return the note on settlement. A discharged note left in circulation is a live risk; return or clear cancellation should be part of the early settlement checklist.
• Confirm stamping at execution, not at enforcement.
• Use a standard template reviewed against local negotiable instruments legislation, rather than drafting per transaction.
• Verify signing authority for corporate makers — a note signed without authority is a defence you do not want to meet at enforcement.

Frequently asked questions

What is a promissory note in simple terms? A signed written promise to pay a specific amount of money, either on demand or by a set date.

What is the difference between a promissory note and a loan agreement? A note is a short instrument containing the promise to pay and can be transferred to another holder. A loan agreement is a fuller contract setting out the whole relationship — covenants, conditions, security — and is not transferable in the same way.

Is a promissory note legally binding? Yes, where properly executed. If it meets the statutory requirements it is also a negotiable instrument, with additional procedural advantages for the holder.

Is an IOU the same as a promissory note? No. An IOU acknowledges a debt but contains no promise to pay at a specified time, so it is not negotiable.

Can a promissory note be transferred to someone else? If it is negotiable — payable to order or to bearer — yes, by endorsement and delivery. A note marked "pay to X only" cannot be.

Does a promissory note need to be witnessed or notarised? It depends on the jurisdiction and the amount. Many places do not require it, but witnessing strengthens evidence of execution and some jurisdictions require stamping.

What happens if the original note is lost? Rights attach to the original, so its loss creates procedural difficulty. Most jurisdictions provide a route to enforce a lost instrument, typically requiring evidence and an indemnity.