Guide to how to sue someone in ontario: Key steps and tips

So, you’re thinking about suing someone. Before you even begin to picture yourself in a courtroom, you need to take a hard, honest look at your situation. It’s not enough to feel wronged; the legal system requires more than that. The first, and most important, step is to figure out if you actually have a case that can win.

This initial reality check can save you a world of time, money, and stress down the road.

Do I Really Have a Case Worth Pursuing?

Starting a lawsuit is a serious decision. The people who succeed are the ones who come prepared. The courts don’t run on emotion; they run on facts, solid evidence, and well-established legal principles.

The first hurdle you need to clear is establishing a cause of action. That’s the legal term for a valid, court-recognized reason to sue.

Identifying Your Cause of Action

What exactly is a cause of action? Think of it as the “why” behind your lawsuit. You can’t sue your neighbour just because they’re annoying. Your problem has to fit into a specific legal box that the court can address.

Some of the most common grounds for a civil claim in Ontario include:

• Breach of Contract: This happens when someone doesn’t hold up their end of a deal. Maybe you hired a contractor for a kitchen reno in your Burlington home. You paid the deposit, but they vanished without ever starting the work. That’s a classic breach.
• Unpaid Debt: You loaned someone money or provided a service, and they’ve ghosted you on payment. A freelance graphic designer in the GTA who delivered a full branding package only for the client to refuse payment is a perfect example.
• Property Damage: Someone’s actions—whether careless or deliberate—damaged your stuff. A common one is when a neighbour’s tree falls during a storm and smashes your fence because they ignored warnings that it was dead and unstable.
• Personal Injury: You were hurt, physically or psychologically, because someone else was negligent. This could be anything from a slip-and-fall on an icy, unsalted walkway at a Toronto shop to a more serious car accident.

A strong case is built on two pillars: a clear legal reason for your claim (the cause of action) and the tangible proof you can present to the court. Without both, even a legitimate grievance may fail to secure a legal remedy.

Gathering Your Evidence

Once you know why you’re suing, you need to prove it. Your word alone is almost never enough to win a case. Evidence is what turns your personal story into a legal argument the court can act on.

Start pulling together every document and digital file you can find. It’s time to become a detective in your own case.

Look for these key pieces of evidence:

• Contracts and Agreements: The signed document is gold, but even written quotes or detailed proposals can establish the terms of your agreement.
• Invoices and Receipts: These show what was promised, what was paid, and any extra costs you had to cover because of the dispute.
• Emails and Text Messages: Don’t underestimate digital chatter. A simple text message confirming a promise or admitting a mistake can be incredibly powerful in court.
• Photographs and Videos: Visuals are compelling. A picture of a damaged car, a video of a leaky roof after a bad repair job—this kind of proof speaks for itself.

The Critical Two-Year Deadline

Here’s something that trips up a lot of people: you don’t have forever to file a lawsuit in Ontario. The Limitations Act, 2002 sets a basic deadline of two years to start your claim.

That two-year clock usually starts ticking from the day you “discovered” the claim. Discovery means the moment you knew (or a reasonable person should have known) that you suffered a loss and who was responsible for it.

Missing this deadline is almost always fatal to your case. The court can—and will—throw out your lawsuit, no matter how strong it is, if you wait too long. If you’re unsure about your specific timeline, you can learn more about the statute of limitations in Canada in our detailed guide.

Choosing the Right Court: Small Claims vs. Superior Court

So, you’re confident you have a solid case. Now comes one of the most critical strategic decisions you’ll make: where to file your lawsuit. This isn’t just a matter of filling out a different form; your choice of court dictates the rules, the costs, and the entire pace of your legal action.

In Ontario, the path you take is determined almost entirely by the amount of money at stake. Getting this wrong from the start can be a costly mistake, potentially forcing you to withdraw and begin all over again. Let’s make sure you get it right.

The People’s Court: Small Claims Court

For many disputes, the Small Claims Court is exactly where you want to be. It was designed to be a more accessible, faster, and less expensive way to resolve legal issues.

The defining rule here is the monetary cap: your claim must be for $35,000 or less, not including any interest or legal costs you might claim.

This is the right venue for many common scenarios:

• A freelance graphic designer is owed $8,000 for a completed project.
• A homeowner paid a contractor $15,000 for a bathroom renovation that was left unfinished or done badly.
• A tenant is trying to recover a $3,000 security deposit that a landlord is wrongfully withholding.

Here’s a crucial tip from experience: you can’t divide a larger debt into several smaller claims to fit under the limit. However, if your claim is just over the threshold—say, for $38,000—you can choose to waive the extra $3,000 and sue for the $35,000 maximum. This can be a smart move to keep your case in the simpler, faster Small Claims system.

When the Stakes Are Higher: The Superior Court of Justice

If your claim is for more than $35,000, your case belongs in the Ontario Superior Court of Justice. Be prepared for a significant shift in complexity. The rules are more rigid, the process is much longer, and navigating it without a lawyer is extremely difficult.

The Superior Court isn’t one-size-fits-all, though. It has two distinct tracks based on the claim’s value.

The Middle Ground: Simplified Procedure

For claims between $35,001 and $200,000, you’ll use what’s called the Simplified Procedure. While still more formal than Small Claims, it’s designed to be a more efficient and affordable path than a full-blown Superior Court action.

We often see the Simplified Procedure used for things like breach of contract disputes in the $100,000 range. It strikes a balance, providing the seriousness of the Superior Court but with built-in limits on things like pre-trial discovery to control the time and cost involved.

The Major Leagues: Ordinary Procedure

Claims exceeding $200,000 must proceed under the Ordinary Procedure. This is the most comprehensive, time-intensive, and expensive process, reserved for the most serious and high-value legal battles. Think major commercial litigation, complex real estate disputes, or significant personal injury cases.

Ontario Court Jurisdiction at a Glance

Choosing the correct forum is fundamental to your legal strategy. For a deeper dive into the procedural differences, you can review our insights on what a civil litigation lawyer in Toronto handles day-to-day.

To help you visualize the differences, here is a direct comparison of the three main paths for a civil claim in Ontario.

Feature	Small Claims Court	Superior Court of Justice (Simplified Procedure)	Superior Court of Justice (Ordinary Procedure)
Monetary Limit	Up to $35,000	$35,001 to $200,000	Over $200,000
Complexity & Rules	Low; designed to be user-friendly	Medium; streamlined but formal rules	High; strict and complex procedural rules
Typical Cost	Lowest	Moderate	Highest
Timeline	Generally fastest	Slower, but with time-saving rules	Longest and most drawn-out process
Pre-Trial Discovery	Very limited or none	Capped at 3 hours of examination	Extensive and in-depth discovery
Trial Format	Shorter, more informal trials	Summary trials are encouraged	Full, formal trials with extensive evidence

Ultimately, the value of your claim sets the stage. Understanding these tiers is the first step in building an effective plan to pursue what you are owed.

The Power of a Professional Demand Letter

Before you jump into the formal process of suing someone in Ontario, there’s a crucial first step that can save you a world of trouble: sending a professional demand letter. This isn’t just an angry email. It’s a strategic, formal communication that can often resolve your dispute before it ever gets near a courtroom.

Think of it as the first official move in a legal chess game. A properly written demand letter signals to the other side that you’re serious, you understand your legal position, and you’re ready to proceed if they don’t cooperate. I’ve seen countless disputes, especially over things like unpaid invoices or clear contract breaches, get settled right at this stage. It saves everyone a huge amount of time, money, and stress.

Crafting a Letter That Gets Results

The effectiveness of a demand letter really comes down to its content and tone. If you write an emotional or threatening letter, it can easily backfire and make the situation worse. The goal here is to be firm, professional, and crystal clear.

Your letter needs to lay out your case logically and concisely. To be taken seriously, it must include a few key things:

• A Factual Summary: Stick to the facts. Briefly and objectively explain what happened from your point of view—what, when, and who—without getting into personal feelings or accusations.
• The Legal Basis: Clearly explain why you believe they are legally on the hook. You might point to a specific clause they violated in a contract or explain how their actions directly caused you financial harm.
• The Specific Demand: This is the “ask.” Be precise. Are you demanding payment of a certain amount, the return of property, or for them to finish a job? State exactly what you want.
• A Firm Deadline: This is critical. Give the other party a reasonable amount of time to respond, usually 10 to 14 business days. This creates a sense of urgency and sets a clear date for when you’ll consider taking the next step.

A well-crafted demand letter does more than just ask for what you’re owed. It creates a formal record that you attempted to resolve the matter reasonably before resorting to litigation, a fact that judges in Ontario look upon favourably.

The Essential Elements of a Strong Demand

When you sit down to write, remember that every word counts. Your tone should be assertive but professional, never aggressive. Avoid insults, name-calling, or over-the-top threats, as this will only hurt your credibility.

Let’s use a real-world scenario. Imagine a homeowner in Burlington paid a roofer a $10,000 deposit for a new roof, but the company took the money and never showed up. The demand letter would calmly state the date the contract was signed, the amount paid, and the company’s failure to perform the work. It would then demand the full return of the $10,000 deposit within 14 days, making it clear that a claim will be filed in Small Claims Court if they fail to comply.

If you’re drafting one yourself, using a good legal demand letter template can be a great place to start to ensure you’re covering all the necessary bases.

This letter isn’t just a threat; it’s an invitation to solve the problem. It opens a line of communication and gives the other side a chance to make things right without the high costs and public record of a lawsuit. By sending a demand letter, you take back some control and steer the dispute toward a resolution you can live with. When your dispute is over a broken agreement, it also pays to be familiar with the different breach of contract remedies available to you in Ontario.

Filing the Claim & The Importance of Procedure

So, your demand letter went unanswered, and the deadline you set has come and gone. Now it’s time to get serious. This is the point where you stop asking and start telling, by formally bringing your dispute before the Ontario courts.

This phase boils down to two key moves: first, drafting and filing the official court document that starts your lawsuit, and second, properly “serving” a copy on the person or company you’re suing.

This isn’t the place for guesswork. The procedural rules are strict for a reason, and simple mistakes in how you prepare or deliver your claim can cause major delays. In a worst-case scenario, a judge could toss your case out on a technicality, forcing you to start all over again. Precision is everything here.

Drafting Your Core Legal Document

The document that kicks off your lawsuit is your opening argument—it’s your chance to tell your side of the story to the court. It needs to be clear, factual, and persuasive. The exact form you’ll use depends on which court you’re in.

• In Small Claims Court, you’ll be working with a Plaintiff’s Claim (Form 7A). This is a more straightforward, fill-in-the-blanks style form designed to be user-friendly. It guides you through stating the key facts, explaining why the other party is responsible, and detailing what you want the court to order.
• In the Superior Court of Justice, the document is called a Statement of Claim. This is a far more complex legal document. It’s not a form but a narrative you draft from scratch, requiring a detailed account of the facts, the specific laws that back up your position, and the precise remedies you’re seeking.

No matter the court, your claim must clearly identify who you are suing (the Defendant), lay out a chronological story of what happened, and state exactly what you’re asking for. For instance, if you paid a supplier $50,000 for materials that never showed up, your Statement of Claim would methodically detail the contract terms, the proof of payment, their failure to deliver, and the financial harm your business suffered as a result.

Filing the Claim With the Court

Once your claim is drafted, it needs to be officially filed with the courthouse. Thankfully, the days of physically lining up at a court counter are mostly behind us. Ontario has streamlined this process with online portals for both the Small Claims Court and the Superior Court.

You’ll upload your completed document and pay the required court filing fee. The court clerk then “issues” your claim, which means they stamp it with an official court seal and assign it a unique file number. This issued claim is now the live document you must deliver to the defendant. For a more detailed breakdown of the administrative steps, you can refer to our guide on how to file a lawsuit.

Starting a lawsuit is a patient, strategic process. It’s important to understand that filing a claim is just the beginning of a long journey, not the end. The system is designed to encourage resolution at many points along the way.

To put things in perspective, court data from 2026 showed that while 75,561 new civil cases were started in Ontario’s Superior Court, only 3,539 actually went to a full trial. This shows that the vast majority of disputes get resolved long before a judge makes a final decision, often through negotiation, mediation, or pre-trial motions. You can get more insights from the 2026 Ontario Superior Court civil stats on fmlaw.ca to better understand these trends.

The Rules of Serving Your Claim

After the court issues your claim, the clock starts ticking. You have six months to formally “serve” the documents on the defendant. Service is the official, legally recognized delivery of court documents to ensure the other side has been properly notified of the lawsuit against them. You can’t just drop it in a mailbox and hope for the best.

Ontario’s Rules of Civil Procedure are very specific about how service must be done. The main methods include:

• Personal Service: This is the gold standard—physically handing the documents to the individual being sued. If they refuse to take them, you can drop them at their feet.
• Alternative to Personal Service: You can leave a copy with an adult at the person’s home and then, as a second step, mail another copy to that same address.
• Service on a Corporation: Documents can be delivered to an officer, director, or any person at the company’s place of business who appears to be in charge.
• By Mail or Courier: In some situations, you can use registered mail or a commercial courier, as these methods provide tracking and proof of delivery.

Once you’ve successfully served the documents, you absolutely must complete and file an Affidavit of Service with the court. This is a sworn legal statement confirming who you served, when, where, and how. Without this proof of service on file, your lawsuit can’t proceed.

The True Cost of a Lawsuit in Ontario

Before you dive into a lawsuit, it’s crucial to have a frank conversation about the costs. The reality I’ve seen play out countless times is that the price of justice goes far beyond the initial court filing fee. A civil claim is a journey with significant financial checkpoints, and knowing what to expect is your best defence against sticker shock.

This is the point where many people understandably hesitate. The potential expenses can feel overwhelming, but being informed allows you to plan strategically instead of reacting to surprise bills down the road. Let’s break down the major costs you’re likely to face.

Understanding Legal Fee Structures

How your lawyer gets paid is often the single biggest expense. In Ontario, we generally work with a few different fee models, and the right one for you will depend on the specifics of your case and your agreement with the firm.

• Hourly Rates: This is the classic model. Your lawyer bills for the time they spend on your file, whether it’s drafting documents, making calls, or appearing in court. These rates can vary dramatically based on a lawyer’s seniority and experience.
• Contingency Fee Agreements: You’ve probably heard this called a “no win, no fee” arrangement. It’s the standard for the personal injury and disability claims we handle here at UL Lawyers. Your lawyer’s fee is simply a percentage of the final settlement or award you receive. If you don’t win, you don’t pay us any legal fees.
• Flat Fees: For straightforward, predictable legal work like drafting a will or setting up a simple corporation, a lawyer might quote you a single, all-in price.

Getting a handle on these costs is a critical first step. It’s always a good idea to learn more about how much does a lawyer cost so you can have a confident, informed discussion with any lawyer you’re considering.

The Hidden Costs: Disbursements

On top of legal fees, every lawsuit involves something called “disbursements.” Think of these as the out-of-pocket expenses your lawyer pays to third parties just to keep your case moving forward. These costs are your responsibility, win or lose, and they can add up faster than you’d think.

Some of the most common disbursements include:

• Court Filing Fees: The fees charged by the courthouse to officially start your claim and file subsequent documents.
• Process Server Fees: The cost to hire a professional to properly “serve” the legal documents on the other party.
• Expert Reports: This is often a big one. In many cases, you’ll need a report from an expert—like a doctor, an engineer, or an accountant—to prove your case. These reports can easily run into thousands of dollars.
• Court Reporter Fees: The cost to have a stenographer transcribe examinations for discovery or trial testimony.

This chart gives you a simplified look at the initial steps, all of which trigger some of these early costs.

From the moment you start drafting and filing, the meter is running. Having a clear financial plan from day one is absolutely essential.

The Loser Pays Rule

Here’s a critical concept in Ontario’s justice system: “costs.” In most cases, the party that wins the lawsuit is entitled to have the losing party pay for a portion of their legal fees and disbursements. It’s often called the “loser pays” rule, and it’s a powerful factor in any lawsuit.

This rule is a double-edged sword. If you win, you can expect to get a significant chunk of your legal expenses back. But if you lose, you could be ordered to pay not only your own lawyer but a large portion of the other side’s legal bill, too.

It’s important to know that a judge has discretion and will rarely award 100% of the winner’s actual expenses. This financial risk is precisely why both sides are strongly encouraged to consider settlement offers throughout the entire process.

The high price of litigation is a major hurdle. In fact, for many mid-sized disputes in Ontario, the total cost of civil litigation is projected to surpass $100,000 by 2026. This has led to a situation where over 70% of people in some courts are forced to represent themselves. While online filing now handles 82.5% of civil documents to make things more efficient, the core expenses of discovery and expert reports remain a significant barrier.

When You Absolutely Need a Lawyer

The big question for many people is: do I really need a lawyer? While you can represent yourself in Ontario’s courts, especially in Small Claims, it’s a decision that carries serious weight. Knowing how to sue someone is one thing, but actually steering your case through the labyrinth of rules, deadlines, and legal arguments is a different ball game entirely.

Going it alone is a gamble. From my experience, I’ve seen well-meaning individuals have their entire case thrown out because they missed a single, crucial deadline. A simple misinterpretation of a procedural rule can be a costly, and sometimes irreversible, mistake.

Levelling the Playing Field

The moment you should absolutely call a lawyer is when you’re facing a powerful opponent. If you’re going up against a big corporation or an insurance company, you can bet they have a team of seasoned lawyers ready to go. Their job is to protect their client’s bottom line, and they are experts at using the system to their full advantage.

Hiring a lawyer isn’t just about getting advice; it’s about evening the odds. An experienced litigator ensures your rights are protected and that you are not intimidated or outmanoeuvred by a powerful adversary.

Our Client-First Approach at UL Lawyers

At UL Lawyers, we’ve built our practice around helping people navigate difficult civil disputes, especially personal injury and disability claims. We know that the biggest hurdle for most people is the fear of legal bills. That’s why we always start with a free consultation with zero upfront cost to you.

For many of our cases, like personal injury and long-term disability claims, we work on a contingency fee basis.

• This means you pay no legal fees unless we win your case.
• Our fee is simply a percentage of the settlement or court award we secure for you.

This model removes the financial risk and gives you access to strong legal support when you need it most. Our goal is to ensure you don’t have to face this fight on your own. If you want to better understand what this involves, learning about the role of a civil litigation lawyer in Brampton is a great next step.

Common Questions About Suing Someone in Ontario

Even after you understand the basic steps, taking legal action can feel overwhelming. It’s completely normal to have questions. Here are some of the most common ones we hear from people just like you, with straightforward answers based on our experience in Ontario courts.

How Long Do I Have to Sue Someone in Ontario?

This is one of the first and most critical questions we get. The clock is ticking from the moment you have a potential case.

Under Ontario’s Limitations Act, 2002, you almost always have a strict two-year deadline to file your lawsuit. This two-year period starts on the day you “discovered” your claim—a legal term for when you first knew, or reasonably should have known, about the injury or loss and who caused it.

If you miss that window, your claim is likely extinguished forever. It doesn’t matter how strong your case is; the court will simply not hear it. This is why it’s so important to act quickly and get legal advice as soon as you think you might have a claim.

What Happens if the Person I Sue Ignores the Claim?

So, you’ve done everything right—you’ve prepared your claim, filed it with the court, and served it on the other party. But then… radio silence.

If the person you’re suing (the defendant) doesn’t file their Statement of Defence within the allotted time (usually 20 days), you can take a powerful next step. You can ask the court to have them “noted in default.”

This is where things get serious for the other side. Once a defendant is noted in default, the court treats all the facts in your claim as if they are true. You can then move forward to get a “default judgment.” Sometimes a judge will grant this automatically, and other times you might need to attend a short hearing to prove the amount of your damages. The key is, you no longer have to prove they were at fault.

Being noted in default is a critical misstep for any defendant. In essence, they give up their right to defend themselves, and the judge can decide the case based only on your side of the story.

Can I Sue for Stress and Emotional Distress?

Yes, you can sue for emotional distress in Ontario, but it’s important to understand that this is a tough one. The courts have set a very high bar.

These types of damages aren’t usually a standalone claim. Instead, they’re typically attached to another legal action, like a serious personal injury case or a wrongful dismissal from a job.

To have any chance of success, you can’t just say you were stressed or upset. You need to provide clear, compelling medical evidence from a qualified professional, such as a psychiatrist or psychologist. Their report must show that you’ve suffered a provable, lasting, and recognized psychiatric injury that was a direct result of the defendant’s actions. The court needs to see a diagnosed condition, not just the natural anger or anxiety that comes with a dispute.

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Navigating a lawsuit is more than just knowing the rules; it’s about making the right strategic moves at the right time. The team at UL Lawyers has the experience to guide you through it. If you’re thinking about starting a claim in Ontario, reach out for a free, no-obligation consultation to talk about your situation. Visit us at https://ullaw.ca to get started.