A promissory note is a one-sided written promise to repay, signed only by the borrower; a loan agreement is a two-party contract both people sign, with fuller terms — funding, schedule, default, governing law. Both are enforceable in Canada; the agreement is the safer choice for family loans because it proves both sides agreed to the same terms.
They both put a loan in writing, and both are legally binding in Canada — but they're built differently. One is a promise; the other is a contract. Here's what separates them, in plain terms.
The short version
Think of it as the difference between a promise and a contract.
A promissory note is the borrower saying, in writing, "I owe you this, and I'll pay it back like so." It's signed by the borrower and records the debt.
A loan agreement is both people saying, in writing, "here are the full terms we've agreed to" — and both signing. It records the debt and the rules around it.
Neither needs a lawyer or notary to be valid in Canada. The difference isn't whether they're legal — both are — it's how much they cover.
Side by side
What a promissory note is
A promissory note is a short document in which the borrower (the "maker") makes an unconditional promise to pay a fixed amount to the lender (the "payee"), either on demand or by a set date. It names the parties, states the sum, sets out repayment, and the borrower signs.
That's its whole job — to record that a debt exists and that the borrower has promised to repay it. It's quick, it's simple, and courts in Canada enforce notes routinely. Its defining feature is that it's unilateral: only the borrower is bound by it.
What a loan agreement is
A loan agreement is a contract signed by both the lender and the borrower. It contains everything a note does, plus the terms that govern what happens around the loan:
- A repayment schedule (lump sum or installments) with a clear final date
- What happens on a missed payment — grace periods and whether the lender can call the full balance due
- Whether early repayment is allowed
- Any security or collateral
- Interest stated as a clear annual rate (under the 35% cap)
- The governing province and how disputes are handled
Because both parties sign, it's bilateral — both sets of obligations are on the record. It's longer than a note, but it answers the questions a note leaves open.
Are they both legally binding?
Yes — and this trips a lot of people up. A promissory note is not a lesser or "informal" document in the eyes of the law; a properly signed note is fully enforceable in Canada. The difference is scope, not validity. A note proves the debt; an agreement proves the debt and the terms. If a dispute is only about "was money owed?", a note may be plenty. If it's about "owed how, by when, with what consequences?", the agreement carries more answers.
A real case where the document decided it
Documentation — note or agreement — is what turns a "he said, she said" into a clear outcome. This Ontario case shows it in action.
This Ontario matter is a useful illustration of why the form of the document matters. A family advance of roughly $164,000 toward a couple's home had no paperwork when the funds changed hands. Years later, with the relationship over and the parties disagreeing about what the money had been, the lender relied on a promissory note created after the fact. Because the borrower had electronically signed it and had previously acknowledged in writing that he would, the court treated the note as binding and granted summary judgment for repayment.
Which should you use?
As a rule of thumb: a promissory note can suit a small, interest-free, lump-sum loan between people who fully trust each other. A loan agreement suits almost everything else — larger amounts, installments, interest, property purchases, or any situation where a relationship breakup could later put the money in question.
The good news is that the fuller document costs you nothing extra in effort. The builder walks you through the same handful of details either document needs and produces a complete two-sided agreement, ready for both signatures on any phone. If you'd like the full decision framework — when a one-page note genuinely covers you and when it quietly doesn't — see is a promissory note enough for a family loan? →
The bottom line
Both documents are legally binding. The note is a one-page promise; the agreement is the full contract. Because a guided agreement takes the same few minutes to make and closes the gaps a note leaves, it's the safer default for nearly every family loan.
Whichever you choose, a signed document is only as strong as your ability to prove it's unaltered. LendRight seals its agreements with a SHA-256 fingerprint anyone can verify — document integrity and the SHA-256 seal.
Create a proper loan agreement in minutes
Skip the one-page IOU and get the full two-sided contract instead — drafted from a few quick answers, signed digitally by both sides. Free to draft.
Create my loan agreement →This article is general information about Canadian law, not legal advice. Rules vary by province, and Quebec's civil-law system differs. For a large or complex loan, consult a licensed lawyer in your province.
We write plain-language guides on lending between family and friends in Canada, reviewed against current provincial and CRA rules. LendRight is not a law firm — this is general information, not legal advice.