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Adverse Inference:
Negative Presumptions for Failing to Present Evidence
Last Updated: August 22 2026
Question: How does an adverse inference work in Ontario if a party fails to produce evidence or testify?
Answer: Forseti Legal Services can help you understand how adverse inferences operate as an evidentiary consequence when a party does not produce relevant documents or testimony they were reasonably expected to provide, which may lead a judge to presume the missing evidence was unfavourable (discretionary and case-specific, not automatic, and considered alongside any legitimate explanation and whether the evidence was under the other party’s control). In Ontario civil cases, the court looks at the circumstances, including whether the witness was key, the best person to provide the information, and whether the witness was equally available to both sides, so getting advice early helps you plan what to prove and how to address any non-production allegations. For a practical paralegal-led review of your situation and next steps, call (705) 806-7577 for a quick intake.
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Understanding the Principle of Adverse Inference as an Evidentiary Rule Arising from Failure to Produce Evidence
An adverse inference may arise where a party fails to testify, or where a party fails to lead evidence that is in control of the evidence, and from such a failure the court may thereby presume that the reason for the absence of the evidence or the absence of testimony is that such would negatively affect the party who fails to provide the testimony or the evidence.
Note: Please contact Forseti Legal Services by phone at: (705) 806-7577 to discuss any specific questions that you may have.
The Law
An adverse inference presumption arises from the expectation that where a litigant is in possession of evidence or control of a witness, the litigant would provide the evidence or present the witness unless the evidence or witness is harmful to the case of the litigant. The legal doctrine was provided within the cases of, among others, Tiwari v. Chevalier, 2022 ONSC 3071, and Lane v. Kock, 2015 ONSC 1972, which respectively stated:
[28] Adverse inferences may be drawn from a party’s failure to produce relevant documents they were required to produce or should have produced. (Sarzynick v. Skwarchuk, 2021 BCSC 443, at para. 190.)
[3] The effect of the failure of a party to testify or to call a material witness or other evidence, is summarized as follows in Sydney N. Lederman, Alan W. Bryant & Michelle K. Fuerst, The Law of Evidence in Canada, 4th ed. (Markham: LexisNexis Canada, 2014) at p. 386:
In civil cases, an unfavourable inference can be drawn when, in the absence of an explanation, a party litigant does not testify, or fails to provide affidavit evidence on an application, or fails to call a witness who would have knowledge of the facts and would be assumed to be willing to assist that party. In the same vein, an adverse inference may be drawn against a party who does not call a material witness over whom he or she has exclusive control and does not explain it away. Such failure amounts to an implied admission that the evidence of the absent witness would be contrary to the party's case, or at least would not support it.
The adverse inference principle is discretionary and a judge is without a requirement to apply the principle where circumstances warrant. The basis for discretionary application of the adverse inference principle was explained by the Court of Appeal in Parris v. Laidley, 2012 ONCA 755, whereas it was stated:
[2] Drawing adverse inferences from failure to produce evidence is discretionary. The inference should not be drawn unless it is warranted in all the circumstances. What is required is a case-specific inquiry into the circumstances including, but not only, whether there was a legitimate explanation for failing to call the witness, whether the witness was within the exclusive control of the party against whom the adverse inference is sought to be drawn, or equally available to both parties, and whether the witness has key evidence to provide or is the best person to provide the evidence in issue.
Summary Comment
The principle of adverse inference is the legal version of saying, if you got it, then flaunt it; and, if a party fails to do so, the court may presume that a party who fails to use evidence does so because the evidence would be unfavourable.
NOTE: A significant volume of online searches featuring “lawyers near me” or “best lawyer in” typically signifies an urgent requirement for capable legal aid rather than a particular professional designation. In Ontario, licensed paralegals are governed by the same Law Society that supervises lawyers and have the authority to represent clients in specified litigation matters. Advocacy, legal analysis, and procedural expertise are vital to that function. Forseti Legal Services provides legal representation within its licensed scope, focusing on strategic positioning, evidentiary preparation, and compelling advocacy aimed at securing prompt and advantageous outcomes for clients.
