A reader searching how to get an injunction in Ontario is usually not looking for abstract doctrine. The question arises when harm is already unfolding: assets are being moved, confidential information is about to be used, a transaction threatens to close on the wrong footing, a fiduciary relationship is breaking down in real time, or conduct that cannot be fully unwound after trial is continuing today. In that setting, an injunction in Ontario is not a procedural convenience. It is one of the court’s most exacting forms of interim relief, invoked where delay itself may alter rights, leverage, or commercial reality.
Table of Contents
1. How to Get an Injunction in Ontario: When Urgent Relief Becomes Necessary
2. What Is an Injunction in Ontario?
3. The Statutory and Procedural Architecture for Getting an Injunction in Ontario
4. The Legal Test for Getting an Injunction in Ontario
4.1 Serious Issue to Be Tried
4.2 Irreparable Harm
4.3 Balance of Convenience
5. Mandatory Injunctions and Without-Notice Relief
6. Step by Step: How to Get an Injunction in Ontario
7. Evidence and Common Mistakes
8. Case Law and Leading Authorities
9. Frequently Asked Questions
Practical Closing Note
Ontario law does not treat injunctive relief as routine. Section 101(1) of the Courts of Justice Act provides that the Superior Court of Justice may grant an interlocutory injunction or mandatory order where it appears “just or convenient” to do so, and Rule 40 provides the procedural path by which that relief is sought. The governing framework is disciplined and familiar: the moving party must fit within a statutory and procedural architecture, and then satisfy the court that extraordinary intervention before trial is warranted under the principles articulated in RJR-MacDonald Inc. v. Canada (Attorney General,1994 CanLII 117 (SCC) and, where mandatory relief is sought, the stricter first-stage approach confirmed in R. v. Canadian Broadcasting Corp., 2018 SCC 5, [2018] 1 SCR 196.
For sophisticated litigants—founders, principals, family offices, hedge fund managers, lenders, boards, and CFOs—the practical point is this: an emergency injunction in Ontario is not obtained by indignation, suspicion, or commercial urgency alone. It is obtained by identifying a legally protectable right, assembling a disciplined evidentiary record, choosing the correct procedural route, and presenting the court with relief that is proportionate, tightly framed, and capable of supervision. That is why the strongest injunction materials read less like advocacy by adjectives and more like a concise bench memorandum: chronology first, rights clearly articulated, harm precisely described, and the proposed order narrowed to what the court can justifiably do at an interim stage.
Key Takeaways · Ontario courts usually require a serious issue to be tried, irreparable harm, and a balance of convenience favouring relief. · Mandatory injunctions attract a higher merits threshold than ordinary prohibitory orders. · Without-notice relief is exceptional, tightly time-limited, and dependent on full and fair disclosure. · Evidence quality matters more than rhetoric: chronology, documents, and a narrowly framed order carry the motion. · The wrong draft order—or an overbroad one—can weaken an otherwise strong injunction record. |
At a Glance: Injunction Process
1. Threat Emerges | 2. Legal Right Identified | 3. Evidence Assembled | 4. Motion Path Chosen | 5. Order / Return Date |
Harm is unfolding now | Contract, property, fiduciary, confidentiality, shareholder, fraud, or governance right identified | Affidavits, chronology, exhibits, draft order, undertaking position | On notice or without notice under Rule 40 | Interim relief sought and prepared to survive the first contested review |
2. What Is an Injunction in Ontario?
An injunction is a court order directing a party either to refrain from doing something or, in some cases, to take a positive step.
In Ontario civil practice, the ordinary statutory foundation is s. 101 of the Courts of Justice Act, which authorizes the Superior Court to grant an interlocutory injunction or mandatory order where it appears just or convenient to do so.
Rule 40 then governs how such relief is obtained procedurally in a pending or intended proceeding. For that reason, when businesspeople, trustees, lenders, or commercial litigants ask how to obtain an injunction in Ontario, they are really asking two questions at once: what legal restraint is available, and by what procedural route can the court be moved quickly enough for the order to matter.
The terminology matters. In Ontario practice, a without-notice interlocutory injunction is often described as an interim injunction because Rule 40.02(1) limits its duration unless extended in accordance with the rule.
In ordinary civil proceedings, such an order may be granted without notice for a period not exceeding ten days; labour-dispute injunctions under section 102 of the Courts of Justice Act are treated separately under Rule 40.02(4).
An interlocutory injunction generally refers to relief operating until a further hearing or trial, usually after notice has been given and the respondent has had an opportunity to answer.
A permanent injunction is final relief granted after adjudication on the merits. Sophisticated readers also distinguish between a standard ex parte injunction in Ontario—which is exceptional and temporary by design—and the broader interlocutory order that may follow once the matter returns on notice.
It is equally important to distinguish a prohibitory injunction from a mandatory injunction in Ontario.
A prohibitory order preserves the position by restraining conduct: do not transfer, do not solicit, do not disclose, do not deal with the asset, do not publish the information.
A mandatory order compels an affirmative act: return the property, restore access, deliver up records, reinstate the status quo ante, or take some other positive step. That distinction is not cosmetic. In R. v. Canadian Broadcasting Corp., 2018 SCC 5, [2018] 1 SCR 196, the Supreme Court confirmed that where the order sought is mandatory in substance, the first branch of the injunction analysis is not merely whether there is a serious issue to be tried, but whether the applicant has shown a strong prima facie case. That higher threshold reflects judicial caution about compelling action before trial rather than merely holding conduct in place.
In commercial litigation, these categories are not academic. The difference between an emergency injunction in Ontario, an interlocutory order on notice, and a mandatory order can determine what evidence must be assembled, what timetable is realistic, and how aggressively the motion should be framed. A sophisticated injunction lawyer in Ontario therefore begins by classifying the remedy correctly. Misclassifying the order is not merely a drafting error; it can distort the applicable threshold, overreach the facts, and needlessly erode credibility before the court.
Table 1. Types of Injunctions
Type | What it does | Typical timing | Key risk |
Interim injunction | Short-term relief, often sought urgently and sometimes without notice | Earliest stage | Can be short-lived and quickly revisited |
Interlocutory injunction | Preserves the position until further order or trial | After notice or return date | Requires a fuller record and careful tailoring |
Permanent injunction | Final relief after adjudication on the merits | End of case | Full entitlement must ultimately be proved |
Prohibitory injunction | Restrains conduct | Interim or final | Must be framed narrowly enough to preserve rather than punish |
Mandatory injunction | Compels a positive act | Interim or final | Higher merits threshold; substance controls over label |
3. The Statutory and Procedural Architecture for Getting an Injunction in Ontario
The Ontario framework is both simple in outline and exacting in execution. Section 101(1) of the Courts of Justice Act empowers the Superior Court of Justice to grant an interlocutory injunction or mandatory order where it appears to a judge to be just or convenient to do so, and subsection 101(2) confirms that the order may include such terms as are considered just. Rule 40.01 then provides the gateway: an interlocutory injunction or mandatory order under s. 101 may be obtained on motion to a judge by a party to a pending or intended proceeding. That last phrase matters. In urgent cases, Ontario procedure does not always require a litigant to wait for the ordinary tempo of a fully matured action before seeking relief.
Where the circumstances truly justify proceeding without notice, Rule 40.02(1) permits an injunction motion to be brought without notice for a period not exceeding ten days in ordinary civil proceedings. Labour-dispute injunctions under section 102 of the Courts of Justice Act are treated separately under Rule 40.02(4). But Ontario procedure is deliberate in limiting that remedy. Rule 40.02(2) provides that any extension ordinarily must be sought on notice to every affected party, unless a judge is satisfied that a party has been evading service or that other exceptional circumstances justify a further without-notice extension; even then, Rule 40.02(3) limits that further ex parte extension to another ten days. In other words, a without-notice injunction in Ontario is designed as a narrow bridge to a prompt return date, not as a stable substitute for adversarial process. That is why courts expect full and fair disclosure from a moving party who seeks an ex parte injunction in Ontario.
The undertaking as to damages is equally central. Rule 40.03 provides that, unless the court orders otherwise, the moving party must undertake to abide by any order concerning damages that the court may make if it ultimately appears that granting the injunction caused damage to the responding party for which compensation ought to be paid. Sophisticated litigants sometimes focus intensely on speed and underappreciate this feature of the motion. That is a mistake. The undertaking is part of the price of asking the court to intervene before the merits have been finally determined, and in a serious commercial case the court may scrutinize both the practical and financial realism of that undertaking.
The motion is not procedurally casual. Rule 40.04 requires factums on a Rule 40.01 motion, with the moving party’s factum to be served and filed at least seven days before the hearing and the responding party’s factum at least four days before the hearing, absent a different timetable in practice or by court direction. Those timelines underscore a larger point: even urgent injunction work remains structured advocacy. The moving party must present a coherent legal theory, a disciplined evidentiary record, and an order tailored to the relief the court can supervise. A seasoned civil litigation lawyer in Ontario will therefore treat the injunction motion not as a theatrical escalation, but as a compressed merits exercise conducted under equitable restraints.
Substantively, this procedural architecture sits on top of the familiar injunction test. In RJR-MacDonald Inc. v. Canada (Attorney General,1994 CanLII 117 (SCC), the Supreme Court described the three-stage framework: a serious question to be tried, irreparable harm if relief is refused, and the balance of convenience. The Court also emphasized that “irreparable” speaks to the nature of the harm rather than its magnitude. Where the order is mandatory rather than prohibitory, R. v. Canadian Broadcasting Corp., 2018 SCC 5, [2018] 1 SCR 196, refines the first stage by requiring a strong prima facie case. For present purposes, the essential point is that Ontario procedure tells you how to move the motion, while the case law tells you whether the court should grant it. Both must be satisfied; neither can be neglected.
4. The Legal Test for Getting an Injunction in Ontario
The injunction test in Ontario is not mysterious, but it is unforgiving. The governing framework remains the three-part analysis from RJR-MacDonald Inc. v. Canada (Attorney General,1994 CanLII 117 (SCC): the moving party must establish a serious question to be tried, irreparable harm if relief is refused, and that the balance of convenience favours the granting of the order. Section 101 of the Courts of Justice Act supplies the jurisdictional footing; RJR-MacDonald Inc. v. Canada (Attorney General,1994 CanLII 117 (SCC) supplies the disciplined method by which that jurisdiction is exercised. For sophisticated litigants, the practical point is straightforward: a motion for an injunction in Ontario is not won by urgency alone, but by fitting urgent facts into that framework with precision.
Table 2. The Injunction Test in Ontario
Branch | What the court asks | What evidence helps |
Serious issue to be tried | Is there a real legal claim worth preserving pending adjudication? | Contractual rights, governance records, title documents, clear pleaded wrongs |
Irreparable harm | Why are damages not an adequate answer if relief is refused now? | Confidentiality loss, asset movement, evidence destruction, governance breakdown |
Balance of convenience | Which side should bear the interim risk of being wrong before trial? | Narrow draft order, practical safeguards, status quo evidence, undertaking position |
4.1 Serious Issue to Be Tried
The first branch is often described as modest, but it should not be trivialized. RJR-MacDonald Inc. v. Canada (Attorney General,1994 CanLII 117 (SCC) states that the threshold is a low one and is satisfied where the claim is neither frivolous nor vexatious; the motions judge conducts only a preliminary assessment of the merits. That said, serious commercial litigants should not mistake “low threshold” for indulgence. On an urgent record, the court still expects to see a coherent cause of action, a clearly articulated right said to be under threat, and a motion theory that corresponds to the relief sought. In other words, the applicant seeking how to get an injunction in Ontario must first show that there is a real legal controversy worth preserving pending adjudication, not merely commercial frustration dressed as urgency.
The first branch also has an important structural qualification. RJR-MacDonald Inc. v. Canada (Attorney General,1994 CanLII 117 (SCC) recognizes that a court may need to look more closely at the merits where the interlocutory ruling would, in practical effect, decide the case or inflict harm that could not later be meaningfully repaired. That principle matters acutely in high-stakes civil and commercial litigation: where the motion’s result will effectively determine control of an asset, a transaction, a business relationship, or a governance dispute before trial, counsel should expect a more exacting judicial review of the merits than the phrase “serious issue” sometimes suggests in the abstract.
4.2 Irreparable Harm
The second branch—irreparable harm Ontario injunction analysis—is where many otherwise strong motions fail. RJR-MacDonald Inc. v. Canada (Attorney General,1994 CanLII 117 (SCC) is clear that “irreparable” refers to the nature of the harm, not its size. The question is whether the refusal of relief would permit harm that either cannot be quantified in monetary terms or cannot later be cured, commonly because damages would not be an adequate answer in practice. That remains the governing touchstone in Ontario injunction law.
For sophisticated readers, the distinction is commercially significant. A large loss is not necessarily irreparable merely because it is large; a modest loss may be irreparable if it alters something that money cannot reliably restore. In serious private disputes, irreparable harm may lie in the destruction of confidentiality, the loss of control over a closely held enterprise, the irreversible movement of property, the compromise of evidence, or the destabilization of a transaction or governance structure in a way that a later damages award cannot realistically unwind. The court is not asking whether the applicant will be inconvenienced. It is asking whether the applicant will be left with a hollow judgment if relief is refused now and success comes later.
That is why experienced injunction counsel frame this branch with restraint and specificity. Courts do not respond well to generalized assertions of reputational concern, market uncertainty, or business stress. The evidence must explain, concretely and soberly, why damages are inadequate and why delay changes the position irreversibly. In a well-prepared emergency injunction in Ontario, the irreparable-harm narrative is typically the fulcrum of the motion.
4.3 Balance of Convenience
The third branch—the balance of convenience injunction Ontario inquiry—asks which course creates the lower risk of injustice pending trial RJR-MacDonald Inc. v. Canada (Attorney General,1994 CanLII 117 (SCC) directs the court to compare the harm from granting relief against the harm from refusing it, and, where relevant, to account for public-interest considerations as part of that balance. In practical terms, the judge asks a disciplined interim question: which side should bear the risk of being wrong before the merits are finally determined?
In sophisticated private litigation, this branch is often where judicial instinct meets equitable discipline. The court will look to the character of the order sought, the immediacy and seriousness of the threatened harm, the adequacy of the proposed safeguards, and whether the order is framed narrowly enough to preserve legitimate interests without overreaching. This is also where overbroad draft orders tend to fail. A party that seeks more than is reasonably necessary to protect the position pending trial often loses the moral force of an otherwise persuasive motion. By contrast, a carefully limited order—particularly one that truly preserves rather than rearranges the terrain—will usually fare better.
For boards, principals, lenders, family offices, and investment decision-makers, the practical lesson is simple: the Ontario injunction test is not three disconnected boxes. The branches interact. A modest merits threshold does not excuse weak proof of irreparable harm. Serious harm does not redeem an overreaching order. And a strong commercial grievance does not relieve counsel of the obligation to propose a form of relief the court can grant with confidence. That is the discipline that separates a credible injunction lawyer in Ontario from counsel who merely repackages urgency as advocacy.
5. Mandatory Injunctions and Without-Notice Relief
Not every injunction motion attracts the default formulation of the first branch. Where the order sought is truly mandatory—that is, where it compels a positive act rather than merely restraining future conduct—the threshold is higher. The Supreme Court in R. v. Canadian Broadcasting Corp., 2018 SCC 5, [2018] 1 SCR 196 held that in the mandatory injunction context the applicant must establish a strong prima facie case, rather than merely a serious issue to be tried.
Ontario civil-procedure commentary on section 101 and Rule 40 summarizes that standard as requiring a strong likelihood of success on the merits, reflecting the greater judicial caution involved when the court is asked to order action before trial.
That distinction matters in real files. A classic prohibitory order says: do not transfer, do not solicit, do not publish, do not dissipate, do not interfere. A mandatory injunction in Ontario says: restore, return, deliver up, reinstate, or permit access. The latter is categorically more intrusive because it alters conduct immediately rather than simply freezing it. Sophisticated motion strategy therefore begins by identifying the true character of the order being sought. Counsel who understate a mandatory order as if it were merely preservative risk losing credibility on the very branch where credibility matters most.
The same caution governs the without-notice injunction Ontario route. Ontario courts may entertain without-notice relief where giving notice would undermine the efficacy of the remedy or materially worsen the harm, but Rule 40.02 confines that route tightly. In ordinary civil proceedings, an interlocutory injunction or mandatory order granted without notice may last no more than ten days initially, with any further ex parte extension itself limited and available only in exceptional circumstances; labour-dispute injunctions under section 102 of the Courts of Justice Act are treated separately under Rule 40.02(4). The structure of the rule makes the point unmistakable: without-notice relief exists for genuine emergency preservation, not for durable one-sided process.
Ontario procedure is equally explicit about the price of proceeding ex parte. Rule 39.01(6) requires full and fair disclosure of all material facts on a motion or application brought without notice, and provides that failure to do so is itself sufficient ground for setting aside the order obtained. That obligation is not ornamental. It exists because the ordinary adversarial safeguards are absent, and the court is therefore dependent on the moving party to present the record with scrupulous fairness, including inconvenient facts. In serious commercial disputes, many ex parte setbacks are not caused by weak entitlement to relief in the abstract, but by overconfident drafting, selective disclosure, or an unduly aggressive framing of urgency.
A party affected by a without-notice order is not without recourse. Rule 37.14 allows a party affected by an order obtained on motion without notice to move promptly to set it aside or vary it, and Rule 40.02 itself contemplates an early return to the adversarial setting. For that reason, a sophisticated applicant should treat any ex parte injunction in Ontario as the first hearing, not the last. The real objective is not merely to obtain the order, but to obtain one that can survive its first contested review.
Table 3. Notice Path vs. Without-Notice Path
Route | When used | Duration | Strategic caution |
On notice | Default course where notice will not defeat the remedy | Can continue until further order or trial, depending on the order | Usually more durable because the court hears both sides from the outset |
Without notice / ex parte | Only where notice may defeat the remedy or materially worsen the harm | Usually up to 10 days initially under Rule 40.02(1) | Full and fair disclosure is indispensable; overreach is often punished at the return date |
Return date | After an initial ex parte order or urgent interim order | Prompt adversarial review | The applicant must be ready to defend both the evidence and the breadth of the order |
6. Step by Step: How to Get an Injunction in Ontario
For sophisticated parties—and for an injunction lawyer in Ontario advising them—the practical question is not simply what the law allows, but how the record must be built in the first hours and days so that the motion is genuinely grantable. Section 101 of the Courts of Justice Act authorizes the interlocutory injunction or mandatory order, and Rule 40.01 permits that relief to be sought by motion in a pending or intended proceeding. The procedural architecture is therefore available early, but only if counsel can identify the right being threatened and the order that is truly necessary to protect it.
The first step is to define the legal wrong with precision. Before any motion record is assembled, the applicant must know whether the threatened harm sounds in contract, fiduciary duty, breach of confidence, shareholder oppression, property rights, fraud, misuse of confidential information, interference with governance, or some other recognized legal interest. This sounds elementary, but it is often where urgent motions go astray. A motion judge will forgive compressed timing sooner than conceptual vagueness. Anyone seriously asking how to get an injunction in Ontario must start not with the drama of the facts, but with the exact right that requires interim protection.
The second step is to build an evidentiary record that can withstand immediate scrutiny. Rule 39.01(4) allows affidavits used on a motion to contain statements based on information and belief, provided the source of the information and the fact of the belief are specified. Rule 39.02(1) further permits a party who has served its affidavits and completed examinations under the rule to cross-examine the deponent of an adverse affidavit. In practice, this means that a serious injunction record must be drafted as if it will be tested almost immediately: chronology should be exact, exhibits should do real work, hearsay should be carefully sourced, and rhetoric should give way to proof.
The third step is to choose the notice path honestly. If counsel seeks a without-notice injunction in Ontario, the motion materials should be able to explain why giving notice would undermine the efficacy of the remedy or materially worsen the harm. If that threshold is not genuinely available, the safer and stronger course is usually to proceed on notice and present the motion as an urgent interlocutory application under the normal adversarial framework. Rule 39.01(6) makes full and fair disclosure mandatory on any without-notice motion, and Rule 40.02 confines such relief to tightly limited duration. Ex parte process is therefore a surgical device, not a mark of aggression or sophistication in its own right.
The fourth step is to price the motion properly, including the undertaking as to damages Ontario requires. Rule 40.03 provides that, unless the court orders otherwise, the moving party must undertake to compensate the responding party for damage caused by the injunction if it later appears the order should not have been granted. Section 101(2) of the Courts of Justice Act further permits the court to impose such terms as are considered just. The consequence is strategic as well as legal: the applicant should seek only relief it can defend both substantively and economically. Sophisticated motion practice is not merely about whether relief can be obtained; it is also about whether the applicant is prepared to bear the interim consequences of obtaining it.
The fifth step is to present the motion as disciplined written advocacy, not improvised emergency theatre. Rule 40.04 requires factums on a Rule 40 motion, and provides that the moving party’s factum is to be served and filed at least seven days before the hearing in the ordinary course. For major Toronto business disputes, counsel should also consider at the outset whether the matter belongs on the Commercial List, which the Ontario Superior Court describes as a Toronto-based team of judges experienced in managing complex commercial litigation, with related practice directions, forms, and model orders available. In sophisticated commercial cases, forum selection is often part of remedy strategy, not an afterthought.
The sixth step is to prepare for the return date as carefully as for the initial appearance. If the order is obtained without notice, Rule 40.02 contemplates a short lifespan and Rule 37.14 permits an affected party to move promptly to set it aside or vary it. In other words, an emergency injunction lawyer Toronto clients trust in a crisis must plan not only for the first order, but for the first challenge to that order. The real measure of success is not that relief was obtained in haste, but that it was framed narrowly enough, supported fully enough, and argued carefully enough to endure once the other side is heard.
Urgent Injunction Checklist · Identify the legal right being threatened with precision. · Determine honestly whether notice can be given without defeating the remedy. · Gather affidavit evidence, a clean chronology, and the exhibits that actually move the analysis. · Draft relief narrowly enough to preserve the position rather than overtake the merits. · Assess the undertaking as to damages and the client’s tolerance for interim risk. · Prepare for the return date, any variation motion, and any Commercial List implications. |
7. Evidence and Common Mistakes
In high-stakes motion practice, the question is not merely what evidence do you need for an injunction in Ontario, but whether the evidentiary record has been assembled in a form that a judge can trust on compressed timelines. Rule 39.01(4) permits affidavit evidence based on information and belief, but only if the source of the information and the fact of the belief are specified; Rule 39.02(1) then permits cross-examination on adverse affidavits once the procedural prerequisites are met. The point is practical, not technical. A credible injunction record is built to survive immediate scrutiny, not merely to carry the applicant over the first appearance.
For sophisticated litigants—boards, principals, CFOs, investment managers, trustees, and lenders—the strongest records usually have five characteristics. First, they identify the right said to be under threat with precision. Second, they set out a disciplined chronology, showing not only that harm is occurring, but why delay matters. Third, they append the documents that truly move the analysis: contracts, governance records, transfers, screenshots, correspondence, banking trails, registry documents, or other business records that corroborate the narrative. Fourth, they explain why damages are inadequate in the circumstances. Fifth, they propose relief that is narrow enough to look preservative rather than punitive. That approach aligns with the structure of RJR-MacDonald Inc. v. Canada (Attorney General,1994 CanLII 117 (SCC), which remains centered on a serious issue, irreparable harm, and the balance of convenience.
The evidence on irreparable harm deserves special emphasis. Many litigants assume that if the threatened loss is large enough, the second branch of the injunction test is automatically satisfied. That is not the law. RJR-MacDonald Inc. v. Canada (Attorney General,1994 CanLII 117 (SCC) makes clear that irreparable harm is concerned with the nature of the harm, not its magnitude. In serious commercial cases, the evidentiary burden is therefore to show why a later damages award would be inadequate: loss of confidentiality, irreversible governance disruption, the movement of title or assets beyond practical recovery, the destruction of evidence, or the kind of market or reputational dislocation that cannot be meaningfully priced after the fact. The affidavit should state this with precision and commercial realism, not with generalized assertions of urgency.
The documentary record matters just as much as the affidavit itself. Sophisticated judges are rarely persuaded by adjective-heavy evidence, especially on an urgent record. What tends to carry weight is contemporaneous documentation that allows the court to move from allegation to inference without guesswork. If the theory is asset dissipation, the court expects to see actual transfer patterns, corporate records, banking activity, or transactional conduct that makes the risk concrete. If the theory is misuse of confidential information, the court expects evidence of access, copying, downloading, possession, threatened use, or a business context in which the misuse is intelligible. If the theory is transactional or governance harm, the documents should show the deadline, the voting mechanism, the contractual trigger, or the closing sequence that creates the urgency.
Where the applicant seeks a without notice injunction in Ontario, the evidentiary obligation is even more exacting. Rule 39.01(6) requires full and fair disclosure of all material facts, and it expressly provides that failure to do so is itself sufficient ground to set aside the order. For serious counsel, that means adverse facts belong in the record, not buried in oral submissions and not omitted in the hope that they can be managed later. A sophisticated emergency injunction lawyer Toronto clients rely upon knows that an ex parte order is only as durable as the fairness of the record on which it was obtained.
Several mistakes recur with surprising frequency. The first is mistaking urgency for entitlement. Ontario procedure allows an urgent court order in Ontario, including without-notice relief for up to ten days, but compressed timing does not dilute the substantive burden. The second is confusing a mandatory order with a prohibitory one. If the order compels positive action in substance R. v. Canadian Broadcasting Corp., 2018 SCC 5, [2018] 1 SCR 196 requires a strong prima facie case, not merely a serious issue to be tried. The third is overbreadth: asking for relief wider than is reasonably necessary to preserve the position pending trial. The fourth is failing to prepare for the undertaking as to damages required by Rule 40.03. And the fifth is treating the first appearance as the end of the motion rather than the beginning of the return-date contest.
That is why the most effective evidence in an injunction Ontario motion is not performative. It is spare, organized, corroborated, and proportionate to the relief sought. Judges deciding urgent injunctions do not need volume so much as confidence: confidence that the right is real, the threat is current, the harm is not truly compensable in damages, and the order proposed is the minimum intervention necessary to hold the line until the merits can be fairly adjudicated.
Common Errors Sophisticated Litigants Still Make · Treating urgency as a substitute for proof. · Seeking relief broader than necessary to preserve the position. · Misclassifying a mandatory order as if it were merely prohibitory. · Underestimating the significance of the undertaking as to damages. · Using the ex parte path where notice was realistically possible. · Winning the first appearance but failing to prepare for the return date. |
8. Case Law and Leading Authorities
Case Law at a Glance
Case | Why it matters | Best used for |
RJR-MacDonald | Core three-part interlocutory injunction test | Ordinary injunction analysis in Ontario |
Canadian Broadcasting Corp. | Strong prima facie case for mandatory injunctions | Mandatory relief and motion framing |
Equustek | Flexible, cross-border injunctive relief | Online or international misconduct |
Aetna | Caution on Mareva-style asset freezing | Pre-judgment asset restraint |
Chitel | Ontario Mareva framework | Dissipation-risk analysis |
Delta Power | Mandatory vs. prohibitory distinction in practice | Characterization of the relief sought |
RJR-MacDonald Inc. v. Canada (Attorney General), 1994 CanLII 117 (SCC)
Any serious discussion of how to get an injunction in Ontario begins with RJR-MacDonald Inc. v. Canada (Attorney General,1994 CanLII 117 (SCC). It remains the foundational authority for the three-part interlocutory injunction test: serious issue to be tried, irreparable harm, and balance of convenience. It is also the case that continues to discipline analysis at the motions stage by reminding courts and counsel alike that “irreparable” refers to the nature of the harm rather than its scale. For any civil litigation lawyer Ontario readers would regard as credible, RJR-MacDonald Inc. v. Canada (Attorney General,1994 CanLII 117 (SCC) is not a citation added for form; it is the architecture within which the motion is actually built.
R. v. Canadian Broadcasting Corp., 2018 SCC 5, [2018] 1 SCR 196
This case matters because it refines the first branch of the test where the order sought is mandatory rather than merely prohibitory. The Supreme Court held that for a mandatory injunction in Ontario, the applicant must show a strong prima facie case. The reason is evident: a mandatory order requires affirmative compliance, often at real cost and sometimes with effectively irreversible consequences before trial. In sophisticated commercial disputes, that distinction often determines whether the motion should be framed as preservative relief or whether counsel must accept the heavier merits burden that accompanies a truly mandatory request.
Google Inc. v. Equustek Solutions Inc., 2017 SCC 34
This case is important not because it changes the ordinary injunction test, but because it illustrates the flexibility and reach of equitable relief once the court has personal jurisdiction and efficacy requires broader restraint. The Supreme Court upheld a worldwide injunction against Google in order to prevent the defendant from evading the practical effect of the court’s orders through online distribution. For sophisticated readers—particularly in fraud, IP, confidentiality, platform, and cross-border commercial disputes—the lesson is that injunctions are not confined to traditional territorial assumptions where narrower relief would be ineffectual. A serious commercial litigation lawyer injunction Ontario practice should understand Equustek less as an anomaly than as an illustration of how equity adapts when local wrongs are enabled by transnational conduct.
Aetna Financial Services Ltd. v. Feigelman, 1985 CanLII 55 (SCC)
This case remains the leading Supreme Court authority on Mareva relief and, more broadly, on the caution with which courts approach pre-judgment asset restraint. The case recognizes the availability of Mareva-style freezing relief, but also underscores its exceptional nature: this is relief that comes close to execution before judgment and is therefore granted only where the evidentiary basis justifies that departure from ordinary process. In this general article about injunction lawyer Ontario strategy, Aetna is significant because it reminds sophisticated litigants that not every fear about collectability or asset movement justifies extraordinary interim restraint. Strong evidence that recovery is genuinely at risk remains essential.
Chitel v. Rothbart, 1982 CanLII 1956 (ON CA)
Although Chitel v. Rothbart, 1982 CanLII 1956 (ON CA) is an Ontario Court of Appeal authority rather than a Supreme Court case, it remains the classic Ontario point of reference for Mareva principles and is expressly recognized in later authorities and commentary, including Aetna. Its continuing importance lies in the discipline it imposed on asset-freezing relief: a strong merits foundation, evidence of assets, a real risk of dissipation or removal, full and frank disclosure on the ex parte record, and an undertaking as to damages. Even where the modern law has become more flexible in some respects, Chitel still captures the central idea that asset-freezing relief is exceptional and must be supported by concrete, specific evidence.
Delta Power Equipment Ltd. v. Kubota Canada Ltd., 2018 ONSC 3595
For Ontario motion practice, Delta Power Equipment is useful as a practical illustration of the mandatory/prohibitory distinction. The Ontario commentary on s. 101 and Rule 40 cites it as an example of an order that, though not always labeled dramatically by counsel, was mandatory in substance and therefore attracted the stronger first-branch test from R. v. Canadian Broadcasting Corp., 2018 SCC 5, [2018] 1 SCR 196. This is precisely why sophisticated injunction work begins with classification. If the motion really asks the court to restore, continue, deliver, or perform, the applicant should assume the judge will look past form to substance.
Read together, these authorities establish the governing logic of Ontario injunction law. RJR-MacDonald Inc. v. Canada (Attorney General,1994 CanLII 117 (SCC)sets the default framework. R. v. Canadian Broadcasting Corp., 2018 SCC 5, [2018] 1 SCR 196 sharpens the test for mandatory relief. Google Inc. v. Equustek Solutions Inc., 2017 SCC 34 demonstrates the adaptability of injunctions where efficacy requires it. Aetna Financial Services Ltd. v. Feigelman, 1985 CanLII 55 (SCC) and Chitel v. Rothbart, 1982 CanLII 1956 (ON CA) impose caution on extraordinary asset restraint. And Ontario examples such as Delta Power Equipment Ltd. v Kubota Canada Ltd., 2018 ONSC 3595 show how courts apply those principles in the practical conditions of commercial litigation. Any party seriously considering how to stop someone by court order in Ontario should begin there—not with slogans about urgency, but with these authorities and the evidentiary discipline they require.
Related Remedies at a Glance
Remedy | Best for |
Interlocutory injunction | Stopping conduct pending adjudication |
Mandatory injunction | Compelling an affirmative step before trial |
Mareva injunction | Freezing assets where there is a real dissipation risk |
Norwich order | Obtaining third-party disclosure to identify wrongdoers or trace conduct |
Anton Piller order | Preserving evidence at risk of destruction or concealment |
Certificate of Pending Litigation | Protecting an asserted interest in land |
9. Frequently Asked Questions
What do you need to prove to get an injunction in Ontario?
In the ordinary case, the applicant must satisfy the RJR-MacDonald Inc. v. Canada (Attorney General,1994 CanLII 117 (SCC) framework: a serious issue to be tried, irreparable harm if relief is refused, and a balance of convenience favouring the order. If the relief is mandatory rather than prohibitory, R. v. Canadian Broadcasting Corp., 2018 SCC 5, [2018] 1 SCR 196 raises the first branch to a strong prima facie case. The motion must also fit within the statutory and procedural framework established by s. 101 of the Courts of Justice Act and Rule 40 of the Rules of Civil Procedure.
How fast can you get an injunction in Ontario?
Ontario procedure permits genuinely urgent relief to be sought quickly, including a motion without notice where the circumstances justify it. But the Rules deliberately constrain that route: in ordinary civil proceedings, Rule 40.02(1) permits a without-notice interlocutory injunction or mandatory order for a period not exceeding ten days, with any further ex parte extension itself limited and available only in exceptional circumstances. Labour-dispute injunctions under section 102 of the Courts of Justice Act are treated separately under Rule 40.02(4). In practical terms, speed is available, but not at the cost of fairness or durability.
Can you get an injunction without notice in Ontario?
Yes—but only exceptionally. Ontario courts may entertain an ex parte injunction in Ontario where giving notice would undermine the efficacy of the remedy or materially worsen the harm, but Rule 39.01(6) imposes a strict obligation of full and fair disclosure of all material facts, and failure to comply is itself sufficient ground to set aside the order. Sophisticated applicants therefore treat without-notice relief as a temporary preservation mechanism, not a tactical shortcut.
How long does an injunction last in Ontario?
That depends on the type of order. In ordinary civil proceedings, a without-notice interlocutory injunction under Rule 40.02(1) lasts no more than ten days unless extended in accordance with the rule; labour-dispute injunctions under section 102 of the Courts of Justice Act are treated separately under Rule 40.02(4). An interlocutory injunction granted on notice may remain in force until further order or trial, depending on its terms. A permanent injunction is final relief granted after adjudication on the merits. That is why the distinction between interim, interlocutory, and permanent relief matters from the outset.
What is the difference between a mandatory and a prohibitory injunction in Ontario?
A prohibitory injunction restrains conduct; a mandatory injunction compels positive action. That distinction matters because R. v. Canadian Broadcasting Corp., 2018 SCC 5, [2018] 1 SCR 196 holds that a mandatory interlocutory injunction requires a strong prima facie case. Ontario commentary and case examples, including Delta Power Equipment Ltd. v Kubota Canada Ltd., 2018 ONSC 3595, reinforce that courts look to the substance of the order rather than the label counsel chooses to attach to it.
What happens if the injunction should not have been granted?
Two consequences matter most. First, the responding party can move to set aside or vary the order, especially where it was obtained without notice. Second, Rule 40.03 generally requires the moving party to give an undertaking as to damages, meaning the court may later order compensation if it appears that the injunction caused loss for which the responding party ought to be compensated. Sophisticated applicants therefore do not ask only whether relief can be obtained; they also ask whether it can be defended, and at what interim risk.
Is an injunction available before a lawsuit is started?
Yes. Rule 40.01 permits an interlocutory injunction or mandatory order to be sought in a pending or intended proceeding. In practice, however, the intended claim must still be coherent, imminent, and capable of supporting the interim relief sought.
Do Ontario courts require an undertaking as to damages?
Usually yes. Rule 40.03 provides that, unless the court orders otherwise, the moving party must undertake to abide by any order concerning damages if it later appears the injunction caused loss for which compensation ought to be paid.
What evidence is strongest on an urgent injunction motion?
Contemporaneous documents, a disciplined chronology, carefully sourced affidavit evidence, and a draft order that is narrower than the client’s commercial frustration usually make the strongest impression. Judges are far more likely to trust records built around proof than around indignation.
Can an injunction be used to stop an asset transfer?
Potentially, yes. Depending on the facts, relief may take the form of an ordinary interlocutory injunction, a preservation-focused order, or a Mareva-type freezing order. Where asset restraint is sought, authorities such as Aetna Financial Services Ltd. v. Feigelman, 1985 CanLII 55 (SCC) and Chitel v. Rothbart, 1982 CanLII 1956 (ON CA) underscore the need for concrete evidence of risk, not speculation.
Can the responding party overturn an ex parte injunction?
Yes. Rule 37.14 permits a party affected by an order obtained on motion without notice to move to set it aside or vary it, and Rule 40.02 contemplates a prompt return to the adversarial setting. That is why ex parte relief must be framed to survive immediate challenge.
When does a matter belong on the Commercial List?
That will depend on the subject matter and the court’s practice directions, but for major Toronto commercial disputes involving shareholder conflicts, insolvency, complex transactional issues, and related urgent relief, the Commercial List often warrants early consideration as part of remedy strategy.
Practical Closing Note
This article is designed to make a sophisticated Ontario injunction brief more navigable without reducing its legal precision. It is not legal advice. Injunction strategy remains fact-specific, record-specific, and intensely procedural; in urgent matters, timing and evidentiary discipline often determine whether relief is obtained, narrowed, or refused.
Get in Touch
Urgent injunctive relief is rarely won by speed alone. It is won by disciplined evidence, careful procedural judgment, and relief framed narrowly enough to survive scrutiny at the first contested hearing.
If you are confronting an immediate threat to assets, property, confidential information, governance rights, or commercial position, early strategic advice matters. ME Law acts for sophisticated clients across Ontario in urgent injunction, shareholder, real estate, fraud, estate, and other high-stakes litigation matters where interim relief may determine whether the ultimate judgment retains practical value.
To discuss a time-sensitive dispute, contact ME Law for a confidential consultation.
Disclaimer
This page is provided for general informational purposes only and does not constitute legal advice. Reading it, using it, or communicating with ME Law through this website does not create a solicitor-client relationship. Injunction strategy is intensely fact-specific, record-specific, and procedural; the availability, scope, and durability of interim relief will depend on the governing facts, the evidentiary record, the procedural posture, and the court’s assessment of the applicable legal test.
No action should be taken or deferred on the basis of this material alone. Legal advice should be obtained in relation to the specific facts of your matter.