Swap Agreement Litigation in Ontario
What Corporations, Funds, and Institutional Counterparties Need to Know When an Interest Rate Swap Goes Wrong
Compliant with Ontario’s Rules of Civil Procedure, the Limitations Act, 2002, and the Courts of Justice Act | Updated for 2026
Introduction: When a Hedge Becomes a Liability
An interest rate swap is supposed to be a risk management tool — a way for a borrower to convert floating-rate exposure into something predictable, or for a fund to hedge a position it can’t otherwise unwind. For most of the life of a swap, that’s exactly what it does. The trouble starts when the underlying loan is refinanced early, when rates move sharply against one side of the trade, when a counterparty defaults on an unrelated obligation and triggers a cross-default clause, or when a bank exercises its contractual right to terminate and hands the client a close-out invoice for an amount that seems to bear no relationship to commercial reality.
At that point, what looked like a straightforward hedging instrument becomes the subject of a serious commercial dispute — one governed by dense, heavily negotiated documentation that most in-house counsel rarely litigate, and that most general commercial litigators have never had to pull apart clause by clause.
This guide sets out how swap agreement litigation actually unfolds in Ontario: the legal basis for a claim, the doctrines Ontario courts apply when interpreting ISDA documentation, the case law that governs discretion and good faith in close-out valuations, and the practical steps a counterparty needs to take — often within days, not months — to protect its position.
What Is a Swap Agreement, and Why Do Disputes Arise?
Most institutional and corporate swaps in Canada are documented under an ISDA Master Agreement, published by the International Swaps and Derivatives Association, together with a negotiated Schedule, a Credit Support Annex governing collateral, and individual Confirmations for each trade. The Master Agreement creates a single, netted contractual relationship across every transaction between the two parties — the “Single Agreement” concept — so that on default or early termination, all outstanding trades collapse into one net sum owed by one party to the other.
Disputes over swap agreements in Ontario tend to fall into a small number of recurring categories, and understanding which one you’re in shapes the entire litigation strategy:
Close-out valuation disputes. When a swap is terminated early — whether by default, a termination event, or a refinancing — the terminating party calculates a Close-Out Amount meant to reflect the commercially reasonable cost of replacing the terminated trade. Because the calculating party is almost always the bank, and because the methodology involves discretion over which market quotes, models, and assumptions to use, this is where the largest disputes originate. A close-out figure that seems inflated is not automatically wrong — but it is not automatically right either, and Ontario courts have made clear that discretion of this kind must be exercised honestly and reasonably, not opportunistically.
Mis-selling and suitability claims. Where a borrower alleges it was pushed into a swap it didn’t understand, wasn’t told about breakage costs, or was given advice that exceeded a salesperson’s role, the claim shifts from contractual interpretation into negligent misrepresentation and, in narrower circumstances, breach of an advisory duty. These claims are harder to win in Canada than borrowers often expect, in large part because of standard-form non-reliance and no-advisory-relationship clauses embedded in every ISDA Schedule — but they are not unwinnable, and the circumstances surrounding the sale matter enormously.
Cross-default and termination event disputes. A default under an entirely separate loan facility, a merger without an assumption of obligations, or a credit downgrade can each trigger termination rights under a swap that has otherwise been performing exactly as intended. Whether the triggering event actually falls within the contractual definition is frequently the whole case.
Collateral and margin disputes under the Credit Support Annex, where the parties disagree on valuation of posted collateral or the timing of margin calls.
The Legal Basis: How Ontario Courts Approach Swap Litigation
Ontario has no swap-specific statute. These disputes are resolved through the general law of contract, informed by the reality that ISDA documentation is negotiated between sophisticated commercial parties represented by counsel. That framing matters — Canadian courts, like their English counterparts, start from the presumption that sophisticated parties who signed detailed, heavily negotiated agreements should be held to their bargain. But that presumption is not absolute, and several doctrines give a disadvantaged counterparty real room to litigate.
Contractual interpretation. The Supreme Court of Canada’s decision in Sattva Capital Corp. v. Creston Moly Corp., 2014 SCC 53 (see also Barclays Bank PLC v. Metcalfe and Mansfield Alternative Investments VII Corp., 2011 CarswellOnt 9183), is the starting point for interpreting any commercial contract in Canada, including ISDA documentation. Sattva requires courts to interpret contractual language not in isolation, but in light of the surrounding circumstances known to the parties at the time of contracting — the “factual matrix.” In swap disputes, this opens the door to evidence about what was actually discussed during the sale of the product, how the parties understood specific defined terms, and what commercial purpose the swap was meant to serve — evidence a bank would often prefer stayed out of the case.
Good faith performance and the exercise of discretion. This is the doctrine that most often decides close-out valuation disputes. The Supreme Court’s decision in Bhasin v. Hrynew, 2014 SCC 71, established an organizing principle of good faith in Canadian contract law and a freestanding duty of honest contractual performance. That principle was sharpened for cases involving contractual discretion in Wastech Services Ltd. v. Greater Vancouver Sewerage and Drainage District, 2021 SCC 7, which held that a party exercising a discretionary power under a contract — precisely what a Calculation Agent does when determining a Close-Out Amount — must exercise that discretion reasonably, and not in a manner unconnected to the purposes for which the discretion was granted. A close-out calculation that technically follows the ISDA methodology but is driven by opportunism rather than a genuine attempt to reflect replacement cost is vulnerable under this line of authority.
Exclusion and non-reliance clauses. Every ISDA Schedule contains representations in which each party confirms it has made its own independent decision to enter into the transaction and has not relied on the other party for advice. Canadian courts generally enforce these clauses between sophisticated commercial parties, but the Supreme Court’s earlier decision in Hunter Engineering Co. v. Syncrude Canada Ltd., [1989] 1 S.C.R. 426, remains the foundational Canadian authority on when exclusion clauses will not be enforced — including where enforcement would be unconscionable in the circumstances of the bargain, or where the clause is being used to escape liability for conduct fundamentally inconsistent with the purpose of the agreement. Whether a non-reliance clause holds up often turns on exactly how the transaction was actually sold, not just what the boilerplate says.
Persuasive comparative authority. Because ISDA documentation is a globally standardized product, Ontario courts and litigants routinely look to English commercial law, which has produced the deepest body of swap litigation jurisprudence anywhere. In Thornbridge Limited v. Barclays Bank PLC [2015] EWHC 3430 (QB) and JP Morgan Chase Bank v. Springwell Navigation Corporation [2008] EWHC 1186 (Comm), the English High Court examined in detail when a bank’s conduct during the sale of a swap crosses the line from ordinary salesmanship into an advisory relationship carrying legal duties — and when a non-reliance clause forecloses that argument regardless. These decisions are not binding in Ontario, but they are frequently cited as persuasive authority given the shared ISDA framework, and a well-prepared factum will engage with them directly.
Available Causes of Action
Depending on the facts, a swap dispute in Ontario is typically litigated through one or more of the following:
Breach of contract — the most common claim, whether disputing a Close-Out Amount, a default determination, or the classification of a termination event.
Which includes wrongful termination – where a non-defaulting party may designate an early termination date if an event of default has occurred and is continuing. Disputes frequently involve whether the terminating party was entitled to do so.
Failure to make payments, also falls under breach of contract, swap agreements generally permit termination by the other party if one party fails to perform its swap payment obligations.
Misrepresentation – whether innocent or fraudulent, may be grounds to set aside a contract, with fraudulent misrepresentation being a statement known to be false or made not caring whether it was true or false. The requirement that the misstatement be material means it must relate to a matter that would be considered by a reasonable person to be relevant to the decisions to enter the agreement.
In Barclays Bank PLC v. Metcalfe and Mansfield Alternative Investments VII Corp, the Court of Appeal found that the representations about ongoing negotiations were material misrepresentations that induced the counterparty to agree to standstill extensions, affecting the validity of subsequent termination notices.
Negligent misrepresentation — where inaccurate or incomplete information was provided during the sale of the swap and the counterparty relied on it to its detriment.
What can fall under both breach of contract, and negligent misrepresentation, is the making of misrepresentations or false warranties, failure to perform covenants, and cross-default to indebtedness or other swaps which are frequent reasons for termination.
Breach of fiduciary or advisory duty — a narrower claim requiring evidence that the relationship went beyond an ordinary arm’s-length sale, an argument that is difficult but not foreclosed by a non-reliance clause where the conduct in fact establishes an advisory relationship.
Unjust enrichment — becomes relevant when a swap agreement is void or unenforceable, allowing recovery of payments made under the invalid contract.
Procedure: Where and How These Cases Are Litigated in Ontario
Swap disputes involving institutional counterparties are almost always litigated in the Superior Court of Justice, and given their complexity, valuation evidence, and often multi-jurisdictional dimension, they are frequently case-managed on the Commercial List in Toronto — a specialized stream designed for exactly this kind of high-value, document-intensive commercial dispute.
Limitation periods matter immediately. Under the Limitations Act, 2002, a claim generally must be commenced within two years of the date the claim was discovered — meaning the date the counterparty knew, or ought reasonably to have known, that it had suffered a loss caused by the other party’s conduct and that a proceeding was an appropriate remedy. In a close-out dispute, that clock often starts running the moment the calculating party delivers its Close-Out Amount statement, not months later when the counterparty finally retains litigation counsel. Waiting to “see how things play out” is one of the most common and most damaging mistakes we see.
Further, the critical challenge in swap litigation is that parties often have only days to respond to termination notices and preserve rights. If an event of default occurs and is continuing, the non-defaulting party may give notice to the defaulting party designating an early termination date. Missing these narrow windows can result in waiver of claims or acceptance of unfavourable valuations.
Urgent relief is sometimes available before the substantive claim is even filed. Where a bank is about to enforce a disputed close-out figure — drawing on collateral, setting off against other accounts, or registering security — an application for an interlocutory injunction can preserve the status quo while the underlying dispute is litigated. This is time-sensitive relief that requires evidence of irreparable harm and a strong prima facie case, assembled and filed on an urgent basis.
Documentary discipline decides these cases. Because ISDA disputes turn on interpretation of specific defined terms against a specific factual matrix, the outcome is won or lost in the documentary record: term sheets, internal valuation models, correspondence from the sale of the product, and the calculating party’s own working papers behind the Close-Out Amount. Early forensic engagement with that record — often before litigation is even commenced — is what separates a credible claim from a losing one.
Practical Steps If You’re Facing a Swap Dispute
Act on the timeline the documentation gives you, not the timeline that feels comfortable. Most ISDA Schedules impose short notice periods for disputing a calculation, and Ontario’s limitation clock does not wait for you to feel ready.
Review jurisdictional basis in relation to an event of a default and consider curing the default.
Preserve every document connected to the sale and performance of the swap, including internal correspondence, marketing materials, and any recorded calls — this evidence frequently disappears from a counterparty’s own systems faster than anyone expects.
Do not accept the calculating party’s Close-Out Amount as final without an independent review of the methodology, the market data used, and whether the discretion exercised was genuinely reasonable.
Get counsel with actual derivatives litigation experience involved before responding in writing to the counterparty’s bank or counsel — early admissions and informal correspondence in these disputes have a way of resurfacing in the litigation record months later.
It is always helpful to also to note that arbitration can be used when disputes do arise. The ISDA has introduced an Arbitration Guide which provides guidance on the use of arbitration clauses within the ISDA Master Agreement (see 2018 ISDA Arbitration Guide and Choice of Court & Jurisdiction Guide).
Conclusion: The Documentation Is Complex. Your Options Are Not Limited.
Swap agreement litigation is unforgiving of delay and unforgiving of counsel who haven’t spent real time inside ISDA documentation. But the doctrines that govern these disputes — good faith performance, the reasonable exercise of contractual discretion, and the factual-matrix approach to interpretation — give a well-prepared counterparty genuine room to challenge a close-out figure, a default determination, or the circumstances under which a swap was sold in the first place.
If your business, fund, or institution is facing a disputed interest rate swap, a contested close-out valuation, or a termination you believe was wrongly triggered, the derivatives and financial markets litigation team at ME Law Professional Corporation can assess the documentation, the calculation methodology, and your available remedies — including urgent relief where enforcement is imminent.
Contact us today for a confidential consultation. Every day that passes after a disputed Close-Out Amount is delivered narrows your options — both procedurally and evidentially. Reach out now so we can review your ISDA documentation and outline your strongest path forward.
For a broader view of how we approach institutional financial disputes, see our overview of Financial Markets & Derivatives Litigation, our dedicated page on ISDA Master Agreement Disputes, and our related article on ISDA Master Agreement Disputes in Ontario, which examines termination mechanics and judicial review of valuation discretion in greater depth. Where enforcement is imminent, our Urgent Interlocutory and Interim Injunctions practice can advise on preserving your position on short notice.
Contact Information
ME Law Professional Corporation
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Website: https://melaw.ca/contact
Telephone: (416) 923-0003
Email: intake@melaw.ca
Disclaimer
This publication is for general informational purposes only and does not constitute legal advice. You should not rely on the statements herein as a substitute for personalized legal consultation. Every case is unique, and outcomes depend on the facts, applicable law, and judicial discretion. The information reflects Ontario’s civil procedure and relevant Canadian jurisprudence as of 2026 and may change through new rules or appellate decisions.