How to serve a defendant
(and find a missing one).

By Jonathan Kleiman, Barrister & Solicitor · Published June 2026

People put enormous effort into preparing a Plaintiff\'s Claim — the facts, the numbers, the documents — and then treat getting it to the defendant as an afterthought. In my experience that is backwards. Service is the step that makes your lawsuit official. Until the defendant has been served the way the Rules require, the case essentially sits frozen: their clock to respond has not started, you cannot note them in default, and you certainly cannot get judgment.

Most of the time, service is straightforward. You hand the documents to the defendant, someone swears an affidavit, and the case moves on. The trouble starts when the defendant does not want to be found — the contractor who screens calls, the customer who moved without a forwarding address, the person who has quietly left the province. The good news is that Ontario\'s rules anticipate exactly that situation. You are not powerless against a defendant who hides.

Below I will walk through how to serve a claim properly, the deadlines that actually bind you, the common situations I see, and — the part people really come here for — what to do when you cannot find the defendant at all. None of this is legal advice about your specific matter, but after years of doing this in Ontario courts, this is the practical map I give clients.

Why service matters more than people think

Service is not a formality you check off. It is the legal event that brings the defendant into the lawsuit and starts their obligations running. Think of it this way: filing the claim creates the case on paper, but service is what tells the defendant — in the eyes of the court — "you are being sued, and the clock is now ticking."

That clock is the whole point. Once a defendant is properly served, they have a flat 20 days to file a Defence. If you never serve them, or serve them in a way the Rules do not allow, that 20-day clock never starts, and the rest of the case has nothing to stand on. I have seen people wait weeks expecting a default judgment, only to discover the service was defective and the deadline they were counting was never actually running.

There is also a fairness principle underneath all of this. The court will not let you win a case against someone who genuinely never knew they were being sued. Proper service is the system\'s way of guaranteeing the defendant had a real chance to respond. That is why the Rules are particular about how it is done and why you have to prove it afterward — both of which I cover below.

From my experience

From my experience, service is where careful plaintiffs and careless ones quietly separate. The careful ones treat it as a real step: they get someone other than themselves to serve, they confirm the defendant\'s identity, they document the date and method, and they have a clean affidavit of service before they take another step. Their cases move.

The careless ones do something that feels reasonable in the moment and turns out not to count. They drop the claim in the mail with no acknowledgment. They serve it themselves because they are the plaintiff and it seemed efficient. They send the defendant a message on social media and assume that is enough. Each of those feels like service. None of them, on its own, necessarily is. And every one of them costs time to unwind.

The pattern I want you to take away is simple: service is not about whether the defendant "found out" about the claim. It is about whether you did it the way the Rules permit and whether you can prove it. A defendant can know all about your lawsuit and still defeat a default judgment because the service was technically defective. Do it right the first time and you never have that conversation.

What the law generally says about service

Most of the mechanics of getting your case to trial vary with the courthouse, but service has a few fixed guideposts worth knowing before you start.

• You have six months to serve. Once your Plaintiff\'s Claim is issued, it must be served on each defendant within six months under rule 8.01. The court can extend that window in some circumstances, but you should not rely on it — a stale claim that blows the six-month deadline can force you to start over.
• You generally cannot serve it yourself. If you are a party to the case, you are not the person who serves the documents. Another adult who is not a party, or a professional process server, does it. This keeps the proof of service credible.
• Personal service is the default. Personal service means handing a copy directly to the individual defendant. For a corporation, personal service is generally on an officer or director, or on a person at the place of business who appears to be in control or management.
• The Rules allow specific alternatives. Beyond personal service, the Rules set out defined alternative methods — for example, leaving a copy with an adult at the defendant\'s home and also mailing a copy, or mailing the claim with an acknowledgment of receipt. These have precise requirements; a method that only almost complies is still defective.
• You have to prove it. Service is backed up by an affidavit of service, sworn by the person who served, setting out who, when, where, and how. That affidavit goes in the court file and is what lets the case advance.

Notice what those guideposts have in common: they are all about doing service in a permitted way and being able to prove it. Get those two things right and the rest of the process opens up. Get either one wrong and you are exposed, even if the defendant knows full well that you have sued them.

Common situations I see

Over the years, I\'ve found that service problems fall into a few recurring shapes. Knowing which one you are in tells you what to do next.

The easy personal service. You know exactly where the defendant lives or works, they are not actively avoiding you, and a process server hands them the documents without drama. This is the most common scenario by a wide margin. The defendant may be unhappy, but they take the papers, the server swears an affidavit, and the 20-day clock starts. Clean and done.

The dodging defendant. This one knows the claim is coming and is making themselves scarce — not answering the door, not being at work when the server arrives, screening calls. A good process server is used to this and will make several attempts at different times of day. Often persistence solves it. When it genuinely does not, the dodging itself becomes useful evidence later if you need to ask the court for permission to serve another way.

The one who has moved or vanished. Here the problem is not avoidance — it is that you do not know where the defendant is at all. They moved with no forwarding address, the business closed, or they may have left the province entirely. This is the situation people worry about most, and it is where locate efforts and, if needed, a motion for substituted service come in. I deal with this case in detail further down, because it deserves its own playbook.

Step-by-step: how to serve a claim properly

Here is the sequence I follow once a Plaintiff\'s Claim has been issued. Treat it as a checklist — most service failures come from skipping or fumbling one of these steps.

1. Confirm you have named the right defendant

Before you serve anyone, make sure you are serving the correct legal person — the right individual, or the corporation under its exact legal name. Service aimed at the wrong party is wasted, and fixing it means amending and re-serving. The full mechanics of naming and issuing are in my guide on how to sue in Small Claims Court in Ontario.

2. Pick your method

Decide how you will serve: personal service on the individual or corporation, or one of the specific alternatives the Rules allow. For most cases, personal service is the cleanest and least likely to be challenged. Choose the method before you involve a server so everyone knows the plan.

3. Get someone other than you to serve

Because you are a party, you cannot be the one who hands over the documents. Use another adult who is not a party, or — my usual recommendation — a professional process server. Servers do this for a living, they know how to confirm identity, and their affidavits hold up.

4. Serve within the six-month window — promptly

You technically have six months under rule 8.01, but treat that as a ceiling, not a target. Serve as soon as you reasonably can. The defendant\'s 20-day clock does not start until service is done, so every week you delay is a week added to your overall timeline. If you want to see how the post-service deadline lands, the Small Claims defence deadline calculator shows you the math.

5. Complete the affidavit of service

Right after service, have the server complete and swear an affidavit of service — who they served, the date, the location, and the method. Do this while the details are fresh. This affidavit is your proof, and the case cannot advance without it.

6. Keep your copies and watch the calendar

File the affidavit of service as required and keep your own copy. Then watch the 20-day clock. If a Defence comes in, the case heads toward a settlement conference; if it does not, you can move toward default. Either way, you are now properly in motion.

What if you can\'t find the defendant?

This is the question that brings most people to this page, so let me be direct: a defendant who cannot be found does not end your case. It just means you have to do two things — make genuine efforts to locate them, and then, if those efforts fail, ask the court for permission to serve a different way.

First, make real efforts to locate them

Before the court will let you serve by an alternative method, it will want to see that you tried — properly, not half-heartedly. So your first job is to chase down every reasonable lead and write down what you did. The kinds of steps I look at include:

• Checking every address you have — current, previous, billing, and the address on any contract.
• Trying known phone numbers and email addresses, and noting what came back.
• Looking at an employer or place of business, if you know one.
• Searching public sources and social media for a current location.
• Asking mutual contacts, family members, or business associates who might know where they are.
• Using a skip-tracing service — a professional locate service — when the trail goes cold.

The point is not just to find the defendant — though often these steps do. The point is also to build a record. If you eventually have to go to the court and say "I genuinely cannot serve this person the normal way," the strength of that request depends entirely on how thorough and well-documented your search was.

Then, bring a motion for substituted service (or to dispense with service)

If your locate efforts do not get you to a defendant you can serve in a permitted way, you can bring a motion asking the court for help. There are two main outcomes you might seek:

Substituted service. This is an order giving you permission to serve by another method that is reasonably likely to bring the claim to the defendant\'s attention — for example, by email, by a social media account they actively use, or by serving a family member who is in contact with them. You propose the method; the judge decides whether it is good enough. The court is essentially saying: you cannot reach this person the ordinary way, so here is an approved alternative that should still get the documents in front of them.

Dispensing with service. In some circumstances, where service genuinely cannot be accomplished at all, the court can order that service be dispensed with. This is more exceptional, and you should expect to show that you truly exhausted your options.

The thread running through both is the same: you cannot simply decide on your own to email the defendant or message them on social media and call it served. A bare social-media message, or leaving documents in a way the Rules do not permit, is not valid service. You need the court\'s order first — and to get it, you need that record of locate efforts I keep harping on. If your defendant is a moving target, this is exactly the kind of situation where it is worth talking to a Small Claims Court lawyer in Toronto before you spend money serving the wrong way twice.

Important records to keep

Service is one of those areas where your paperwork is doing real legal work. Two categories of records matter most, and I treat both as non-negotiable.

Proof of service. The affidavit of service is the document that proves the defendant was served — who, when, where, and how. Keep it complete and accurate, and keep your own copy. Without it, you cannot reliably note a defendant in default or move the case forward, even if service actually happened.

Records of your attempts to locate. If the defendant is hard to find, keep a running log of everything you tried — dates, addresses checked, calls made, searches run, and the results. If you end up bringing a motion for substituted service, this log is the backbone of your evidence. The court is far more likely to grant alternative service when you can show a careful, documented search rather than a vague claim that you "couldn\'t find them."

Both kinds of records also help you understand the broader path your case is on. If you want to see how service fits into the larger picture, what happens after a statement of claim in Ontario maps out the stages that follow.

Common mistakes I see

A handful of service mistakes come up over and over, and each one can quietly derail an otherwise solid case. Here are the ones to avoid.

Serving it yourself when you are a party. This is the most frequent one. You are the plaintiff, you know where the defendant is, so you serve the papers yourself to save a step. But as a party you generally cannot be the server, and doing so can taint the service. Have another adult or a process server do it.

Missing the six-month window. An issued claim is not served just because it exists. Sit on it too long and you can blow the six-month service deadline under rule 8.01, which at best means asking the court for an extension and at worst means starting over. Serve promptly.

Sloppy proof of service. An affidavit of service with the wrong date, a vague description of the method, or missing details is a gift to the other side. If your proof is weak, your service is vulnerable. Get it complete and accurate while the facts are fresh.

Assuming a Facebook message is service. Messaging the defendant on social media, or emailing them, feels like you have reached them — and maybe you have. But a bare social-media message is not valid service unless a court has ordered substituted service by that method. Knowing the defendant saw your message is not the same as having served them within the Rules.

What happens next

Once service is properly done and you can prove it, the case finally has traction. The defendant\'s flat 20-day clock to file a Defence starts running from the date of service.

If the defendant files a Defence within those 20 days, the case moves into the scheduled-court system, where a mandatory settlement conference comes before any trial. If you want a sense of the road ahead from there, I lay out realistic stages and waits in my guide on how long Small Claims Court takes in Ontario.

If the defendant does nothing within the 20 days, you can ask the clerk to note them in default and then move for default judgment. This is precisely why proper service matters so much: default is only available if you served them correctly and can prove it. A defendant who was never properly served can often have a default judgment set aside. The flip side — what to expect when a defendant simply never engages — is covered in what happens when a defendant does not show up in Small Claims.

And remember that getting judgment is not the end of the story. If you win and the defendant still does not pay, you move into enforcement, which is its own process — I walk through the tools in how to enforce a Small Claims Court judgment in Ontario.

Settlement considerations

Service and settlement might seem unrelated, but in my experience they are quietly connected. Proper service is often what makes a defendant take the dispute seriously in the first place. A demand letter can be ignored; a claim that has been formally served, with the 20-day clock running, tends to focus the mind. More than once I have seen a defendant who stonewalled for months suddenly want to talk the week after they were served.

That is worth keeping in mind if you are weighing how hard to push on a hard-to-serve defendant. Once you have located and served someone who has been avoiding you, the leverage often shifts. The settlement conversation that was going nowhere can reopen, because now there is a real deadline and a real consequence — default — sitting on the table.

If you are representing yourself through this, it is worth understanding how the pieces fit together so you can use that leverage well. My overview of the steps to represent yourself in Small Claims Court in Ontario puts service in the context of the whole self-represented journey.

Key takeaways

• Service makes the lawsuit real. Until the defendant is properly served, their 20-day clock does not start, and nothing downstream — default, judgment, enforcement — can happen.
• You usually cannot serve it yourself. As a party, get another adult or a process server to serve, and have them swear the affidavit of service.
• Mind the deadlines. You have six months to serve under rule 8.01, but serve promptly — the defence clock and your whole timeline wait on it.
• A missing defendant is not the end. Make documented efforts to locate them, then bring a motion for substituted service or, where appropriate, to dispense with service.
• Proof is everything. A clean affidavit of service and a record of your locate efforts are what let the court — and you — rely on the service you did.

Frequently asked questions

How do I serve a Small Claims claim in Ontario?

Once your Plaintiff's Claim is issued, you have to deliver it to each defendant in a way the Rules allow. The standard method is personal service — physically handing a copy to the individual. The Rules also set out specific alternatives, like leaving a copy with an adult at the defendant's home and mailing a copy, or mailing with an acknowledgment of receipt. You generally cannot serve it yourself if you are a party, so another adult or a process server does it. Then you complete an affidavit of service to prove it happened, and you do all of this within six months of issuing the claim.

Can I serve the defendant myself?

Generally, no — not if you are a party to the case. If you are the plaintiff suing in your own name, you cannot be the one who hands over the documents. Someone else has to do it: another adult who is not a party, or a professional process server. This rule exists to keep the proof of service clean and credible, because the person who serves swears an affidavit confirming what they did. In my experience this trips people up constantly. They serve it themselves to save money, then learn the service may not count. Have someone else do it from the start.

How long do I have to serve the claim?

After your Plaintiff's Claim is issued by the court, you must serve it on each defendant within six months under rule 8.01. The court can extend that window in some circumstances if you ask in time and have a good reason, but you should never count on it. In my experience the smartest move is to serve promptly — every week you sit on an issued claim is wasted time, and letting the six-month window lapse can force you to start over. Serving quickly also matters because the defendant's 20-day clock to file a Defence does not start until service is properly done.

What counts as personal service?

Personal service means physically handing a copy of the claim to the defendant. For an individual, that is giving the documents directly to that person — not a roommate, not a voicemail, not an email. For a corporation, personal service is generally made on an officer or director, or on a person at the place of business who appears to be in control or management. The person who serves does not need the defendant to sign anything or to accept the papers graciously; if they identify the defendant and leave the documents with them, that can be enough. They then record exactly what happened in an affidavit of service.

What are the alternatives to personal service?

Personal service is the default, but the Rules set out specific alternative methods you can use instead. For example, you may be able to leave a copy with an adult at the defendant's home address and also mail a copy to that address, or mail the claim together with an acknowledgment of receipt that the defendant signs and returns. These alternatives have precise requirements, and getting the details wrong can invalidate the service. I keep this general on purpose: confirm the exact method and steps for your situation before you rely on it, because a method that almost complies with the Rules is still defective service.

How do I serve a corporation?

Serving a corporate defendant follows the personal-service idea but is aimed at the company rather than a single person. Personal service on a corporation is generally made on an officer or director of the company, or on a person at the corporation's place of business who appears to be in control or management of that place. The practical key is naming the corporation correctly in the first place — the exact legal name, not a trade name or a guess — and then directing service at the right people. In my experience getting the corporate name wrong is one of the most common reasons service and the whole claim has to be redone.

What if I can't find the defendant?

You are not automatically stuck. First, you make genuine efforts to locate them — checking known addresses, employers, social media, mutual contacts, and using a skip-tracing service if needed. Document every step. If you still cannot serve them the normal way, you can bring a motion asking the court for an order for substituted service, which is permission to serve by another method reasonably likely to bring the claim to their attention. Where appropriate, the court can also dispense with service. The court will want to see the steps you took to find them, which is exactly why keeping a record of your search matters so much.

What is substituted service?

Substituted service is a court-ordered alternative for when you genuinely cannot serve a defendant by the normal methods. You bring a motion, show the court the efforts you already made to locate and serve the person, and propose a different method that is reasonably likely to bring the claim to their attention — for example, email, a social media account they actively use, or service on a family member. If the judge agrees, you serve in that approved way and it counts as valid service. The key is that you cannot simply decide on your own to email or message someone — you need the court's order first.

Do I have to prove I served them?

Yes. Service is not complete in any practical sense until you can prove it, and you prove it with an affidavit of service. The person who actually served the defendant swears an affidavit setting out who they served, when, where, and how. That document goes into the court file and is what lets you move the case forward — including noting a non-responding defendant in default. In my experience sloppy or missing proof of service is one of the quiet case-killers: the service may have happened, but if you cannot prove it properly, the court treats it as though it did not.

What happens after the defendant is served?

Once service is properly done, the defendant's flat 20-day clock to file a Defence (Form 9A) starts running under the Rules of the Small Claims Court. If they file a Defence in time, the case moves toward a mandatory settlement conference. If they do nothing within those 20 days, you can ask the clerk to note them in default and then move for default judgment. This is exactly why prompt, proper service matters so much: nothing downstream — no defence deadline, no default, no judgment — happens until the defendant has actually been served and you can prove it.

Final thoughts

Service is the unglamorous step that quietly decides whether your case moves or stalls. Do it the way the Rules allow, get someone other than yourself to serve, and keep clean proof — and you rarely think about it again. Cut corners, and you can lose weeks unwinding service that never counted, or watch a default judgment get set aside because the defendant was never properly brought into the case.

The harder situation — a defendant you cannot find — is also the one where the system has your back the most, as long as you do the work. Chase every reasonable lead, write down what you did, and the court can give you permission to serve another way. The defendant who hides is not beyond reach; they just require a more deliberate path. And if you are unsure where your case sits, you can always confirm which courthouse it belongs to on the list of Ontario Small Claims Court locations.

If you want help serving a difficult defendant, or you are facing a vanished one and weighing a motion for substituted service, call 416-554-1639 or book a free consultation. A short conversation can usually tell you whether your service plan will hold up — before you spend money doing it twice.