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ARTICLE · 22 MAY 2026

Plead Carefully: SCC Clarifies Cause Of Action Estoppel And Limits On Relitigation

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The Supreme Court of Canada has clarified the boundaries of cause of action estoppel in civil litigation, holding that litigants must advance all reasonably available legal theories arising from the same material facts in their initial proceeding.

CanadaLitigation, Mediation & Arbitration
Teagan Markin
Teagan Markin
Vivian Cheng
Vivian Cheng
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In Patrick Street Holdings Ltd. v. 11368 NL Inc., 2026 SCC 15, the Supreme Court of Canada held that cause of action estoppel barred the appellant from advancing a new theory in a second proceeding to support its entitlement to mortgage proceeds. The Court’s decision is an important reminder that litigants must bring forward all reasonably available arguments in the first proceeding, and subsequent attempts to relitigate the same underlying cause of action will likely be barred. Respondents must raise res judicata at first instance to rely on its protections, including by properly pleading the underlying material facts.

Background

The dispute arose from a commercial property owned by 11368 NL Inc. and encumbered by multiple mortgages. Patrick Street Holdings Ltd. was one of the secured creditors.

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