Promissory note vs loan agreement: which one do you need?

A promissory note is a simple unconditional promise to pay, while a loan agreement sets out the full terms of a loan.

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

The short answer

A promissory note is a short document in which one party promises to pay a sum of money to another. A loan agreement is a longer contract that sets out the full terms of the lending arrangement, including repayment, interest, default and security. Both can be legally enforceable, but they do different jobs.

Think of the note as the promise and the agreement as the rulebook. A note is enough for a simple loan between people who trust each other. An agreement is better when the loan is larger, the term is longer or the parties need protection if something goes wrong.

What a promissory note contains

Under the Bills of Exchange Act, a promissory note must be in writing and signed by the maker, and it must contain an unconditional promise to pay a sum certain in money. Beyond those essentials, a note usually states the amount, the payee, whether it is payable on demand or at a set time, and any interest rate.

Because a note is meant to be simple, it rarely includes detailed default clauses, security arrangements or covenants. That simplicity is the point: a note can be drafted in minutes and still create a binding obligation.

What a loan agreement contains

A loan agreement is a fuller contract. It typically covers:

• The principal amount and how it is advanced.
• The interest rate and how interest is calculated.
• The repayment schedule and payment dates.
• Prepayment rights and any penalties.
• Events of default and the lender's remedies.
• Security, collateral or a personal guarantee.
• Covenants the borrower must meet.
• Governing law and dispute resolution.

All of this detail gives the lender more control and the borrower more clarity. If a payment is missed or a covenant is broken, the agreement says what happens next.

Key differences at a glance

Are both enforceable?

Both a promissory note and a loan agreement can be legally enforceable contracts if the requirements of contract law are met. That means there must be an offer, acceptance, consideration and an intention to create legal relations. A written note or agreement makes the terms easier to prove, but it does not replace the need for a valid contract.

A note has the added quality of being a negotiable instrument, which can allow it to be transferred to another party. A loan agreement is generally not negotiable in the same way, because it is a contract between specific parties with detailed terms.

Interest and legal limits

Whichever document you use, the interest rate is subject to Canadian law. The Criminal Code sets a criminal rate of interest, which has been 35% APR since 1 January 2025. The Interest Act provides that where a contract provides for interest but does not state an annual rate, interest is not chargeable at more than 5% per annum.

Those limits apply regardless of the document's name. Calling a loan a promissory note does not let you charge a rate that the law prohibits, and stating the annual rate clearly protects both sides.

When to use a promissory note

A note suits a straightforward loan between people who know each other, such as a family loan or a small private advance. It also works as a simple record of a short-term obligation. If the parties trust each other and the terms are basic, a note may be all that is needed.

When to use a loan agreement

A loan agreement is the better choice when the amount is large, the term is long, or the lender needs protection. It is also the right tool when there is security, a guarantor or covenants. Business loans, car financing and private mortgages usually come with an agreement rather than a bare note.

Using both together

The two documents are not rivals. Many lenders use a loan agreement to set the terms and a promissory note as the borrower's formal promise to pay. The agreement governs the relationship, and the note records the debt itself. Used together, they give a lender both detail and a simple, transferable promise.

Common mistakes

The most common errors are leaving out the annual interest rate, failing to sign the note, and mixing casual language with legal terms. Another is assuming a note replaces the need for a contract: if the basic elements of a contract are missing, the document may not be enforceable no matter what it is called.

What about a verbal loan?

Not every loan is written down. A verbal agreement can still be a contract, but proving its terms is much harder if a dispute arises. A written note or agreement turns a memory-based arrangement into evidence that a court can read.

For a promissory note specifically, writing is not optional. The Bills of Exchange Act requires the note to be in writing and signed, so an oral promise cannot be a promissory note under the Act. It might still be an enforceable contract on other grounds, but it will not carry the features of a note.

Choosing the right document

Ask three questions. How much is being lent? How long will it take to repay? What should happen if a payment is missed? A small, short and simple loan points toward a note. A large, long or risky one points toward a loan agreement, often with a note alongside it.

Getting advice

Promissory.ca is not a lender and does not provide legal or tax advice, and it charges consumers no fee. The right document depends on your situation and your province. Have a qualified lawyer review a note or agreement before you sign, especially when the amount is significant.