How to Serve the Defendant in a Small Claims Court Case

It's a common misconception that filing a claim is the moment a case officially begins for the other side. It isn't. Until the defendant has been properly served, they're not legally on notice, and your case can't move forward — which makes this unglamorous step one of the most important in the entire process.

What service actually means

Service is the formal act of delivering a copy of your issued claim to the defendant, in a way that satisfies the court's rules. It's not the same as the defendant simply finding out about the case informally — a text message, a mutual friend mentioning it, or a social media post doesn't count. The method matters as much as the fact that they received it.

This surprises people who assume that once the other side "knows" about the case, that's good enough. It isn't. Even a defendant who calls you up angry about the claim, having somehow heard about it, still needs to be formally served through an accepted method before the case can legally move forward against them.

Why getting it right matters so much

Service is what starts the defendant's clock to respond. If you serve improperly and the defendant later challenges it, you may need to redo the entire step — losing time and potentially complicating your case. Worse, if a case proceeds to a default judgment based on improper service, that judgment can be vulnerable to being set aside later, undoing progress you thought you'd made. Getting this step right the first time is worth the extra care.

Common accepted methods of service

Ontario's rules set out specific acceptable ways to serve a defendant, generally including options like personal delivery (handing the documents directly to the defendant) and service by mail to a valid address, sometimes with additional requirements depending on the method. The exact accepted methods and any conditions attached to them can be detailed and specific — confirm the current rules for your situation rather than assuming a method is acceptable just because it seems reasonable.

A typical service scenario, step by step

To make this concrete, here's roughly how service tends to unfold for a straightforward case against an individual defendant with a known address:

1. Confirm the defendant's current address using the most reliable information available to you.
2. Confirm the accepted method for your situation and court location before attempting service.
3. Carry out service using that method, noting the exact date, time, and circumstances as they happen.
4. Complete an Affidavit of Service describing what you did, and file it with the court.
5. Keep a copy of everything — the affidavit, any receipts or tracking information, and your own notes — in case questions come up later.

A business defendant, an out-of-province defendant, or a defendant who's hard to locate all add extra considerations on top of this basic pattern — see the sections below for each.

Serving an individual vs. a business

Serving an individual generally means delivering the documents to them personally, or to their residence following the applicable rules for that method. Serving a business is often different — it may involve delivering documents to a specific person authorized to accept service on the business's behalf, such as an officer, director, or registered agent, depending on how the business is structured. Confirm the business's correct structure — sole proprietorship, partnership, or corporation — before serving, since this can change who needs to receive the documents.

If you can't locate the defendant

If you've made genuine efforts to locate the defendant and haven't succeeded, you may be able to ask the court for permission to use substituted service — an alternative method than what's normally required. This generally isn't a first resort; you typically need to show you made real efforts first. Document every attempt you make to locate or serve the defendant, including dates and methods, in case you need to demonstrate this later.

Reasonable efforts might include checking known former addresses, workplaces, social media profiles for current information, or asking mutual contacts (without discussing the details of your claim). Keep a simple log as you go — the date, what you tried, and the outcome — rather than trying to reconstruct your efforts from memory later.

Proving you served them

Once service is complete, you'll generally need to file proof with the court — commonly an Affidavit of Service, a sworn document confirming how, when, and by what method service happened. Keep detailed notes as you go: the exact date, time, location, method, and (if someone else served the documents for you) who did it. Reconstructing these details later from memory is far harder than noting them at the time.

Timing: don't let it drift

There's generally a specific window after your claim is issued within which you need to complete service — confirm the current deadline for your situation rather than assuming you have unlimited time. Treat filing and serving as two steps that should happen close together, not a filing followed by an indefinite pause.

What happens if service goes wrong

If service is later found to be improper — the wrong method was used, or it wasn't properly directed to the right person or entity — the court may require you to serve again before the case can proceed. If this happens after a default judgment was already granted, the defendant may be able to ask the court to set the judgment aside. Neither of these is a permanent setback, but both cost time you didn't need to lose, which is why care at this stage pays off.

This is also why rushing service to hit a deadline can backfire. Serving quickly but incorrectly often costs more time overall than serving carefully a few days later, since you may end up repeating the entire step from scratch.

Special situations

• The defendant lives outside Ontario. Serving someone outside the province (or country) can involve additional rules — confirm the current requirements before assuming your usual method applies, since cross-border service is one of the areas most likely to have specific, different requirements.
• The defendant seems to be avoiding service. Document each attempt carefully — the date, time, location, and what happened — even when an attempt is unsuccessful. A pattern of documented, unsuccessful attempts can support a later request for an alternative method if it comes to that.
• Multiple defendants. Each defendant generally needs to be served individually, even if they're connected to the same dispute or live at the same address. Don't assume serving one household member covers everyone who needs to be served.
• The defendant is incarcerated or otherwise hard to access directly. Unusual circumstances like this are worth raising with the court office directly rather than guessing at how to proceed.

Common mistakes to avoid

• Assuming informal notice counts as service. It doesn't, regardless of how certain you are the defendant knows about the case.
• Using an untested or assumed method instead of confirming the current accepted options.
• Serving the wrong person for a business, based on an outdated understanding of who's authorized to accept it.
• Letting time pass between filing and serving without a clear plan.
• Not documenting attempts when the defendant is hard to locate.
• Forgetting to file proof of service once it's complete.

Frequently asked questions