Background
11368 NL Inc. owned property encumbered by numerous mortgages and other charges. In 2016, it defaulted on a mortgage held by Patrick Street Holdings Limited. Patrick Street commenced power of sale proceedings, briefly suspended when 11368 agreed to grant Patrick Street a new collateral mortgage of $4 million. Patrick Street then reactivated its power of sale proceedings under the original defaulted mortgage and purchased the property itself. As the selling mortgagee, Patrick Street prepared an accounting of the sale proceeds that allocated funds to pay out several mortgages it or its affiliates held — including the new $4 million collateral mortgage — leaving insufficient proceeds to satisfy junior encumbrancers’ claims.
Two of those encumbrancers challenged Patrick Street’s accounting in 2016 applications. The application judge reviewed the accounting, reduced or excluded several of Patrick Street’s claimed amounts, expressly excluded the $4 million mortgage from the accounting, and ordered payment to the two encumbrancers. Patrick Street appealed and lost. In 2019, 11368 filed a separate application seeking the residue of the sale proceeds. Patrick Street responded by arguing that even though the $4 million mortgage had been excluded from the accounting in 2016, it remained a valid and enforceable contract between the parties that had never been extinguished, and that the 2016 proceeding had not dealt with its rights as against 11368 as mortgagor.
The application judge rejected Patrick Street’s argument, relying on his 2016 decision, and ordered the residue paid to 11368. The Newfoundland and Labrador Court of Appeal upheld that result, finding that res judicata — specifically cause of action estoppel — barred Patrick Street from relitigating its entitlement to payment under the $4 million mortgage. Patrick Street appealed to the Supreme Court of Canada.
The Court’s Holding
A six-justice majority (Wagner C.J., joined by Rowe, Kasirer, Jamal, O’Bonsawin, and Moreau JJ.) dismissed the appeal. The majority held that 11368 had properly pleaded and raised res judicata before the application judge in the 2019 proceeding — by reproducing the prior accounting decisions, appending the earlier judgments to its pleadings, and pressing the argument orally — and that Patrick Street was on notice of the case it had to meet. Accordingly, 11368 satisfied the long-recognized obligation to plead res judicata at first instance in order to rely on the doctrine.
On the merits of cause of action estoppel, the majority found all four requirements satisfied. The 2016 decision was final (upheld on appeal, leave not sought). The same parties were involved. The cause of action — establishing the validity, value, and priority of encumbrances on the property through a judicial accounting — was identical in both proceedings, not separate and distinct. And Patrick Street could have advanced, with reasonable diligence, its defence of the $4 million mortgage claim in 2016, when the validity of every item in its accounting was squarely before the court. Its failure to do so barred it from raising those arguments in 2019.
The majority further held that no exceptional circumstances warranted exercising discretion to decline applying estoppel. Patrick Street was fully aware in 2016 that its claim under the $4 million mortgage was being contested; the 2016 applications addressed the entirety of its accounting, not merely a discrete slice of a larger dispute; and there was no procedural unfairness tainting the earlier proceedings. Three justices dissented. Justice Martin (joined by Karakatsanis J.) would have allowed the appeal on the ground that res judicata, even if technically applicable, should not be applied due to the lack of clarity in the record and the fact that Patrick Street could not reasonably have foreseen that the 2016 encumbrancer dispute would permanently extinguish its mortgage claim. Justice Côté dissented on the more fundamental ground that res judicata was never properly pleaded or raised before the application judge in 2019 and therefore could not be raised for the first time on appeal; she would have remitted Patrick Street’s claim for a merits determination.
Key Takeaways
- A party invoking res judicata must plead the material facts giving rise to the doctrine at first instance — but need not use the precise term; procedural fairness and adequate notice to the opposing party are the governing standards.
- Cause of action estoppel applies across proceedings where the same factual subject matter (here, the validity, value, and priority of encumbrances on a property) forms the basis of the dispute, even if the nominal parties’ roles differ between proceedings.
- The rule in Henderson v. Henderson — requiring parties to advance all reasonably available arguments in a single proceeding — is strictly applied; failure to litigate a defence when the opportunity existed is fatal to relitigation, absent exceptional procedural unfairness.
- Courts retain a narrow discretion to decline applying cause of action estoppel where procedural unfairness infected the prior proceeding, where the initial application addressed only a discrete portion of a larger dispute, or where the matter was outside the parties’ reasonable contemplation — but this discretion is to be exercised only exceptionally.
- A mortgagee conducting a power of sale bears litigation risk not only in defending encumbrancer challenges to its accounting, but in any subsequent proceeding involving the same distribution of sale proceeds; all arguments supporting its accounting must be pressed at the earliest opportunity.
Why It Matters
This decision provides the Supreme Court’s clearest modern articulation of the pleading obligation for res judicata and of how cause of action estoppel operates across related but formally distinct proceedings. For lenders and mortgagees, it is a significant warning: a mortgagee that is a respondent in an encumbrancer’s challenge to its power-of-sale accounting must advance every available argument in defence of its claimed entitlements at that stage. Silence or partial argument will not preserve rights for a later proceeding, even one initiated by a different party for a different purpose.
More broadly, the decision reinforces the principle of finality in litigation and confirms that cause of action estoppel is not defeated merely because the party configuration shifts between proceedings (applicant versus respondent) or because the second proceeding ostensibly concerns a distinct claim. The three-justice dissent signals ongoing judicial tension over how strictly estoppel doctrines should be applied in summary application proceedings where pleadings are minimal and parties may not anticipate the full dispositive reach of an earlier order.