CanadaHow does the presumption of undue influence work in family transactions?
In Canada, a presumption of undue influence arises in family transactions where one party holds a position of trust or dominance over the other and benefits from the transaction — shifting the burden to the dominant party to prove the transaction was fair and freely entered into.
What the Law Says
Canadian law does not codify undue influence in a single statute; it is a common law doctrine developed through case law. No federal or provincial statute defines or sets out the presumption of undue influence — it is entirely judge-made law rooted in equity and fairness.
The presumption of undue influence applies automatically in certain relationships — like parent-child, solicitor-client, or trustee-beneficiary — where one person is in a position to dominate the will of another.
It arises when: (1) a confidential or fiduciary relationship exists, and (2) the dominant party receives a benefit from the transaction. Once triggered, the burden shifts to that party to prove the transaction was fair, fully understood, and freely agreed to.
No legislation prescribes how to rebut the presumption — courts look at factors like independent legal advice (ILA), full disclosure, opportunity to reflect, and whether the transaction reflects the vulnerable party’s true intentions.
What Courts Have Said
The Supreme Court of Canada’s decision in Geffen v. Goodman Estate remains the leading authority on presumed undue influence in family contexts.
The Court confirmed that a presumption of undue influence arises in relationships of trust (e.g., mother-son), especially where the dominant party benefits. To rebut it, the beneficiary must show the transferor acted freely, with full knowledge and appreciation of the transaction — ideally supported by independent legal advice.
What to Do
Identify whether a confidential or fiduciary relationship exists (e.g., parent-child, caregiver-dependent).
Determine if the transaction benefits the dominant party — triggering the presumption.
Ensure the vulnerable party receives independent legal advice before finalizing the deal.
Document full disclosure of terms, alternatives, and consequences.
Preserve evidence showing voluntariness — e.g., written statements, witness accounts, timing, and absence of pressure.
Sources
Not legal advice. This article is general information based on publicly available sources, written for educational purposes. Laws change and individual situations vary. Consult a licensed attorney in your jurisdiction before acting on anything you read here. Last reviewed: 2026-06-08.