Is a promissory note legally binding in Canada?

A promissory note can be legally binding in Canada when it meets the Bills of Exchange Act and contract law.

By Promissory.ca Editorial Team Reviewed against official Canadian sources Last updated: 2026-09-16

The short answer

Yes, a promissory note can be legally binding in Canada. It is not binding just because it is called a promissory note, though. It must meet the requirements set out in the Bills of Exchange Act and the general rules of contract law. When it does, a payee can enforce it in court.

The reverse is also true. A note that is missing a signature, leaves the amount uncertain or makes the promise conditional may not be enforceable as a promissory note, even if both parties intended it to be one.

What the Bills of Exchange Act requires

Under the Bills of Exchange Act, a promissory note must be in writing and signed by the maker. It must contain an unconditional promise to pay a sum certain in money. Those three elements, writing, signature and an unconditional promise for a fixed sum, are the foundation of a valid note.

The Act also deals with details such as whether a note is payable on demand or at a specified time, and how it can be transferred. A note that satisfies the Act is a negotiable instrument, which gives it features that a plain contract does not have.

Contract law still applies

Even a well-drafted note must rest on a valid contract. That means there must be an offer, acceptance, consideration and an intention to create legal relations. In a loan, the consideration is usually the money advanced by the lender and the promise to repay it.

If the underlying contract is invalid, the note may not be enforceable either. For example, a loan made for an illegal purpose can undermine the note that records it. The note is evidence of the debt, but it does not create a debt where none validly exists.

What can make a note unenforceable

Several problems can weaken or defeat a promissory note:

• The maker did not sign it.
• The amount is unclear or not a sum certain.
• The promise is conditional rather than unconditional.
• A required element such as the payee is missing.
• The maker lacked the capacity to contract.
• The note was signed under duress or undue influence.
• The underlying purpose was illegal.
• The limitation period for suing has expired.

Some defects can be cured, and others cannot. A missing signature is usually fatal, while a missing interest rate may only affect how much interest can be charged.

Interest and the criminal rate

If a note charges interest, the rate must respect Canadian law. The Criminal Code sets a criminal rate of interest, which has been 35% APR since 1 January 2025. A rate above that ceiling can be a criminal offence, and a court may refuse to enforce the interest.

The Interest Act adds a second limit. Where a contract provides for interest but does not state an annual rate, interest is not chargeable at more than 5% per annum. Stating the annual rate clearly on the note avoids that default.

Limitation periods

Even a valid note can become unenforceable if too much time passes. The time limit for suing on a debt is set by provincial limitation legislation, and it is typically two years in many provinces, but the rule varies. Confirm your province's limitation period rather than assuming a single number applies everywhere.

Acknowledging the debt or making a partial payment can, in some provinces, restart the clock. If a note is old, get legal advice before assuming it is either dead or still enforceable.

How courts look at a promissory note

Courts start with the document itself. A clear, signed note that states a fixed amount and an unconditional promise is strong evidence of a debt. The court then looks at the surrounding facts: whether the money was actually advanced, what payments were made, and what the parties said to each other.

Where the note is ambiguous, the court may consider the parties' conduct and any related documents. This is why a loan agreement often accompanies a note: it fills in the terms the note leaves out.

Steps that strengthen a note

1. Put the agreement in writing and sign it.
2. State the amount as a fixed sum.
3. Make the promise unconditional.
4. Name both the maker and the payee clearly.
5. State the annual interest rate, if any.
6. Set out whether payment is on demand or on a date.
7. Keep records of the money advanced and every payment received.

These steps do not guarantee a win in court, but they make enforcement far easier if a dispute arises.

Who can enforce a note

The original payee can enforce a note, and so can a later holder if the note has been transferred. A holder in due course, someone who takes a negotiable instrument in good faith and for value, may be able to enforce it even if the original parties had a dispute. This is one reason notes are treated differently from ordinary contracts.

If you are asked to pay a note that has changed hands, check the chain of transfer and the signatures. If something looks irregular, get legal advice before you pay or refuse.

Partial payment and acknowledgment

In some provinces, acknowledging a debt or making a partial payment can restart the limitation clock. That means an old note may become enforceable again if the maker takes certain steps. If you are a maker who believes a debt is too old to collect, get legal advice before you make a payment or sign anything.

When to get legal advice

Promissory.ca is not a lender and does not provide legal or tax advice, and it charges consumers no fee. Whether a particular note is binding depends on its wording, the facts and your province's law. Have a qualified lawyer review the note before you sign or before you try to enforce it.