Most fraud cases turn on a lie. A false statement, deliberately made, intended to deceive. But some of the most consequential fraud cases in Canadian law involve no false statement at all. They involve what one party chose not to say.
The law’s position on this is more nuanced than most people expect. Keeping quiet is generally not fraud. But there is a well-developed body of case law that identifies specific circumstances in which staying silent is treated as equivalent to lying, with the same legal consequences: rescission, damages, and in many cases, a clock reset on limitation periods that would otherwise have extinguished the claim. Understanding where silence crosses that line is central to civil fraud litigation in Ontario.
This article works through when silence becomes actionable, what courts require before they will find a duty to speak, how half-truths are treated, and what the discovery of fraudulent concealment does to a plaintiff’s ability to bring a claim.
The Starting Point: No General Duty to Volunteer Information
The foundational rule is straightforward: mere silence does not constitute fraud, except in special circumstances. A party to an arm’s-length transaction is not required to volunteer information that might disadvantage their own negotiating position. Each side is expected to look after their own interests, and absent a specific obligation to speak, silence is not a misrepresentation.
This principle has consistent support in the case law. Courts have denied fraud claims against parties who said nothing while someone else made a misstatement, against auditors who held back information about a client’s questionable financial arrangements, and against parties who simply failed to correct an assumption the other side reached independently. As the courts in Liu v. Huang and Canson Enterprises Ltd. v. Boughton & Co. both confirm, a party who remains silent induces no mistake. There must be a positive assertion of some kind before fraud can be made out.
When the General Rule Gives Way
The exceptions to this rule are well-defined, and courts have approached them carefully to avoid collapsing the general principle into a broad duty of disclosure that commercial transactions cannot support.
Canadian case law identifies two core categories in which silence will constitute deceit. The first is where known material qualifications of an absolute statement are left out. If a party makes a statement that is technically accurate but omits facts that change its meaning, the omission forms part of the representation. A statement that is true as far as it goes, but false in its overall impression, is a misrepresentation. The second is where the circumstances give rise to a duty to speak, such that the other party is entitled to infer from the silence that the undisclosed facts do not exist.
The Duty to Speak
A duty of disclosure does not arise simply because one party knows something the other does not. Courts have required something more, and have identified several relationships and circumstances in which the duty reliably exists.
Special or fiduciary relationships. Where the parties stand in a relationship of trust, confidence, or special proximity, the duty to disclose material facts is established. Solicitor and client, insurer and insured, and corporate officers and shareholders are the clearest examples. In these contexts, the three elements of fraudulent concealment are: (1) the defendant and plaintiff have a special relationship; (2) given the confidential nature of that relationship, the defendant’s conduct is unconscionable; and (3) the defendant conceals the plaintiff’s right of action, either actively or through the manner of the wrongdoing.
Once a topic is introduced in negotiations. A party who chooses to speak on a material subject during negotiations is thereafter obliged to say everything material on that subject. The Manitoba Court of Appeal stated the principle directly in Alevizos v. Nirula: once a party breaks silence on a relevant subject, they impliedly undertake a duty they would not otherwise have had. The right to stay quiet is forfeited the moment a party decides to engage with a topic.
Contractual or statutory duties of disclosure. Where a contract or statute imposes a positive obligation to disclose, breaching that obligation with intent to deceive is fraud. In insurance, the intentional withholding of information material to the risk satisfies the knowledge requirement for fraud without the need to locate a separate common law duty.
Latent defects in property. A vendor who knows of a latent defect, one not discoverable on reasonable inspection, and stays quiet about it is guilty of fraudulent misrepresentation. This principle extends to sellers who made a disclosure declaration and then failed to update it when a new defect emerged before closing. It does not apply to defects that are obvious or known to the buyer, where caveat emptor continues to operate.
Selective document disclosure. A party who is under a contractual duty to disclose and provides an outdated environmental or expert report while holding a more recent, adverse one commits fraudulent concealment. The choice to produce the benign version while withholding the damaging one is active fraud, not mere silence.
Active Concealment: Conduct, Not Just Words
Fraudulent concealment does not require that anything false be said. The doctrine covers deliberate concealment of material facts and conduct designed to prevent or discourage the other party from discovering the truth.
The Sliwinski v. Marks decision from the Ontario Court of Appeal is a useful illustration. A solicitor procured a mortgage by giving his client an ultimatum: execute the mortgage, or he would not appear for her the following day. The threat was a breach of his ethical duty and prevented her from independently assessing the transaction. The mortgage was found null and void. The fraud was not in a false statement, but in conduct that foreclosed her ability to discover the true state of affairs.
Fraudulent concealment also arises when a party who knows of a prior legitimate interest of a third party proceeds to convert that economic benefit for themselves without disclosure. Where conversion or theft is covered up by falsifying books of account, the initial wrong and the subsequent concealment are both actionable. Diverting funds received for a contractual purpose while staying silent about the diversion is simultaneously a fraudulent misrepresentation and a breach of trust.
The line between passive non-disclosure and active concealment is not always clean. Courts have recognized that there is a fine line between failing to disclose on one side and active concealment or recklessness on the other, and that both are capable of grounding fraudulent misrepresentation.
Silence constitutes deceit in two circumstances: where known material qualifications of an absolute statement are omitted, and where a duty to speak exists such that the other party is entitled to infer from the silence that the undisclosed facts do not exist. A representation need not be verbal. Conduct designed to prevent or discourage discovery of the truth is equally actionable.
Half-Truths
The half-truth is the most common form of silence as fraud in commercial practice. A statement can be word-for-word accurate and still be a fraudulent misrepresentation if it omits facts that give it a different meaning. The law requires full disclosure to ensure that statements are completely true, not merely technically defensible.
Canadian courts have consistently held that incomplete disclosure amounting to a half-truth can constitute the necessary deceit. The Ontario Court of Appeal confirmed in Borrelli v. Chan that “omission, silence, half-truths, inaction, or the non-disclosure of material information” are all capable of constituting fraud. Documents that misrepresent the ownership of intellectual property by making accurate but partial disclosures can simultaneously be active misrepresentation and material non-disclosure.
In investment contexts, disguising the true nature of a proposed investment through selective omission is fraud. Knowing concealment of a material fact has the same legal effect as an express false statement. And as University of Regina v. HTC Purenergy Inc. confirms, in the realm of actionable fraud, knowingly concealing a material fact has the same effect as knowingly making an express misrepresentation.
The Duty to Correct
A separate but related obligation arises when circumstances change after a representation has been made. If a party makes a statement that is true at the time and later discovers it has become false, they are under a duty to correct the misapprehension before the other party acts on the now-outdated version.
The Supreme Court of Canada addressed this directly in Rainbow Industrial Caterers Ltd. v. Canadian National Railway Co. A party who learns of changed circumstances affecting a prior representation originally made in good faith must correct it. The fact that the original statement was honest provides no protection if they later discover it is wrong and say nothing.
Where a representation is made during negotiations to induce entry into a contract, courts generally treat it as continuing until the contract is fully performed. It is no defence to show that the other party could have discovered the truth independently. The obligation to correct sits with the party who made the representation.
The Knowledge Requirement
Fraudulent concealment requires subjective knowledge. A defendant who genuinely does not know they have committed a wrong, or who does not know that the concealed fact is material, is not guilty of fraud. As the BC Court of Appeal confirmed in Anderson v. British Columbia (Securities Commission), dishonest concealment of material facts can amount to fraud, but proof of the accused’s subjective knowledge of those facts is still required.
The defendant does not need to know the specific legal significance of what they are concealing. Courts have confirmed that the defendant need not know the fact is relevant to a potential claim, or have a legal obligation to disclose it. What the doctrine requires is a deliberate decision not to inform. Intentional concealment, not mere neglect.
Wilful blindness occupies contested territory. There is authority, including from English commercial courts, that actual knowledge includes knowledge that would have been acquired but for a person wilfully shutting their eyes to the obvious or recklessly failing to make the inquiries an honest and reasonable person would make. However, constructive knowledge, meaning what a person ought to have known, is generally not enough to ground fraud. The defendant must have decided not to inform.
One practical consequence: to prevent a representation from being fraudulent, there must be an honest belief in its truth. A representor who suspects a statement is wrong but makes it anyway without verifying it may satisfy the test for fraud, even without confirmed knowledge of the falsity.
Silence and Contractual Good Faith
The Supreme Court of Canada’s 2020 decision in C.M. Callow Inc. v. Zollinger is the most significant recent development in this area. The Court held that the common law duty of honest performance, which prohibits actively lying in the performance of contractual obligations, can be breached through silence in the right circumstances.
The Court’s reasoning was specific: silence becomes dishonesty when one party realises the other is operating under a false impression as a result of the first party’s own prior misrepresentations, and the first party then fails to correct that misapprehension. The Court drew on the good faith obligations in articles 6, 7 and 1375 of the Civil Code of Québec, which prohibit the abusive or dishonest exercise of contractual rights, and blended those principles with the common law’s developing doctrine of honest performance.
Callow does not impose a general duty of disclosure in contracts. Parties are not required to volunteer all information that might benefit the other side. But a party who has created a false impression and then stays silent to preserve the advantage of it has crossed into dishonesty, even without any new false statement being made.
The Civil Law Dimension
Under Québec civil law, the principle is stated more directly than anywhere in the common law. Article 1401 of the Civil Code of Québec provides expressly that fraud may result from silence or concealment. This is known as dol négatif, or negative fraud: allowing another party to operate under a false impression without correcting it.
Journey Freight International Inc. v. Twist Production inc. is a good illustration of the doctrine in action. A defendant company failed to disclose accumulated net losses of approximately $1 million over its first two fiscal years, allowing its counterparty to assume its financial condition was sound. The court found that simply letting someone believe something without disabusing them of that belief is as wrong as an outright lie.
Fraudulent Concealment and Limitation Periods
One of the most practically significant consequences of fraudulent concealment is what it does to limitation periods. Where a defendant conceals a cause of action, whether by active steps or through the manner of the wrongdoing, the limitation period is suspended until the plaintiff discovers the concealment or reasonably ought to have discovered it.
The Three-Part Test
The test comes from Ambrozic v. Burcevski and has been consistently applied across Canadian jurisdictions. Three things must be established:
- The defendant perpetrated some kind of fraud;
- The fraud concealed a material fact necessary for the plaintiff to succeed at trial; and
- The plaintiff exercised reasonable diligence to discover the fraud.
Each requirement has teeth.
First, the fraud must be perpetrated by the defendant or their agents on the plaintiff. The courts require “conduct which, having regard to some special relationship between the two parties concerned, is an unconscionable thing for the one to do towards the other.” The defendant must know of the wrong. A defendant who is unaware they have committed a wrong is protected by the limitation period even where the plaintiff remained ignorant.
Second, the concealed fact must be material to the claim. It must be a fact the plaintiff would need to prove to succeed at trial, not merely one that would improve the odds. As the case law puts it, the relevant fact must be necessary to plead a statement of the case, not just improve the success of the claim.
Third, the plaintiff cannot be passive. If the fraud could have been discovered through reasonable inquiry and the plaintiff failed to make it, the limitation period runs from when they ought to have discovered the truth. Discoverability is inherently fact-specific, but the courts have held that the plaintiff must make the inquiries a reasonable person in their position would have made.
Ontario’s Limitations Act
In Ontario, section 15(4) of the Limitations Act, S.O. 2002, c. 24, Sch. B gives statutory form to the fraudulent concealment doctrine for the ultimate limitation period. That period does not run during any time in which the defendant wilfully conceals from the plaintiff the fact that injury, loss or damage has occurred, or wilfully misleads the plaintiff as to the appropriateness of legal proceedings as a remedy.
The word “wilfully” carries real weight here. Passive non-disclosure is not enough. Concealment under the Act involves active hiding, disguising, or masking of misconduct. The policy choice embedded in the statute is deliberate: failing to speak up, without more, does not suspend the ultimate limitation period indefinitely.
What the Doctrine Cannot Do
The limits of fraudulent concealment are as important as its scope.
Purely passive parties are not liable. A party who makes no representation cannot be guilty of fraud by omission alone. Remaining silent while someone else commits a fraud, without any legal obligation to speak, is not collusively fraudulent. Physical proximity to another person’s fraud, without more, imposes no liability.
Patent defects are not covered. Where the allegedly concealed fact is obvious and readily discoverable through diligence appropriate to the transaction, silence is not actionable. Caveat emptor continues to govern where defects are visible and the plaintiff had a reasonable opportunity to inspect.
The suppressed fact must be material to consent. The concealment must relate to something foreseeably important to the plaintiff’s willingness to enter the transaction. A defendant has no duty to dispel a plaintiff’s private and legally unsupported assumptions. The concealed fact must be one without which the cause of action cannot be made out, not simply one that would strengthen the plaintiff’s position.
No general duty to correct another’s error. Absent a prior representation, a special relationship, or a statutory obligation, a party is not required to correct a mistaken assumption the other side has reached independently. Courts have declined to impose a general duty to disclose or to correct another’s statement, citing the risk that such a rule would dramatically expand the scope of liability.
Corporate and Agency Considerations
Fraudulent concealment does not dissolve at the corporate boundary. Where a corporation is used as an instrument of fraud and the directing mind deploys its separate legal personality to insulate themselves from personal liability, courts will pierce the veil. The separate personality doctrine is ignored where a corporation is used for fraudulent purposes.
Employers face similar exposure through the conduct of their employees. Where an employee makes a misrepresentation within the apparent scope of their authority, the employer is estopped from denying that authority. The employer’s vicarious liability rests on the same principle that prevents corporations from disclaiming the fraudulent acts of their directing minds.
Auditors have historically occupied more protected ground. Courts have held that auditors, bound by professional duties of confidentiality, have no general obligation to disclose information about their clients to third parties. A qualified endorsement of a business’s prospects, stopping short of a positive misrepresentation, does not become fraud through purposeful omission alone.
What This Means in Practice
For anyone involved in a significant transaction, the law of fraudulent concealment operates as a practical constraint that goes beyond what most people assume.
If you are the party with the information, full and timely disclosure of all material facts is the only safe position, particularly once you have engaged with a topic during negotiations. A half-truth that is technically accurate but creates a false overall impression carries the same legal risk as an outright lie. If circumstances change after you have made a representation, the obligation to update it rests with you, not with the party who relied on it.
If you are the party who was kept in the dark, the question is whether a duty to disclose existed in the circumstances. The relevant considerations include the nature of your relationship with the other party, whether the topic was raised at any point during negotiations, whether any statutory or contractual disclosure obligation applied, and whether the concealed fact was discoverable through reasonable inquiry.
If you suspect concealment has affected your ability to bring a claim and a limitation period may be an issue, fraudulent concealment may suspend that period. But it requires establishing all three elements of the Ambrozic test and demonstrating that you took reasonable steps to discover the wrong. Neither the suspicion of concealment nor the fact of ignorance is enough on its own.
Whether you are in a property transaction that fell apart because of what was not said, an investment made on selective information, or a commercial relationship where material facts were withheld, our commercial litigation practice advises on civil fraud, misrepresentation, and the remedies available to those who have been deceived. Contact Grigoras Law to discuss your situation.
Conclusion
Equity has long treated the suppression of truth as the equivalent of suggesting a falsehood. Lord Keeper Henley put it plainly centuries ago: every deed obtained by suggestio falsi or suppressio veri is an imposition in a court of conscience. Canadian courts have built a substantial body of doctrine on that foundation.
The conditions that transform silence into fraud are specific: a duty to speak must have existed, or a half-truth must have been told that carried a false overall impression. The defendant must have had actual subjective knowledge of the concealed fact. And the concealment, whether active or through the manner of the wrongdoing, must have hidden something material to the plaintiff’s claim.
Where those conditions are met, silence is treated as fraud in all but name. The doctrine is still developing, particularly at the intersection of contractual good faith and tortious deceit. But the direction of travel is clear: the line between permissible silence and actionable concealment falls earlier than many parties to commercial transactions assume, and the consequences of crossing it are serious.
