Common Defences in Ontario Small Claims Court

Most defendants know, in a general sense, that they disagree with a claim — but turning that instinct into an actual, effective legal defence is a different skill. This article walks through the defences that come up again and again in Ontario Small Claims Court cases, with the reasoning behind each one and realistic examples of how they play out. For general background on how a Defence fits into the broader court process, see the Ontario Superior Court of Justice's guide to the Small Claims Court process.

What actually counts as a defence

In Small Claims Court, a Defence is your formal, written response to a claim, and it needs to do more than express disagreement in general terms. A strong Defence responds to the plaintiff's specific allegations one by one — admitting what's true, denying what isn't, and explaining anything in between. The defences below are the recurring patterns those specific responses tend to fall into.

A defence on the merits is also different from arguing that the claim itself shouldn't have been brought at all — see dismissing a frivolous or vexatious claim for that narrower, less common situation.

Complete denial of the facts

Sometimes the most straightforward defence is that the core facts alleged simply didn't happen the way the plaintiff describes — the work wasn't done, the goods weren't delivered, the agreement described never existed. This defence lives or dies on evidence and credibility: messages, receipts, photos, and witnesses that support your version over the plaintiff's. A bare "that's not true" carries far less weight than a documented account of what actually happened instead.

Consider a claim where a plaintiff alleges they lent a former friend $3,000 in cash with no paperwork. If the defendant genuinely never received the money, this is a complete denial case — but without any documentation on either side, it often becomes a credibility contest decided largely on which account is more consistent and more plausible given the surrounding circumstances.

Partial admission, or a dispute over amount

Frequently, a defendant doesn't dispute that something is owed — only how much. This is arguably the most common real-world defence, because most disputes involve services or goods that were at least partially delivered or partially satisfactory. A Defence here should admit the parts you agree with specifically, and dispute the rest with equal specificity — for example, agreeing that work was performed but disputing the hourly rate charged, or agreeing that goods were delivered but disputing that all of them matched what was ordered.

This type of defence tends to be persuasive precisely because it isn't all-or-nothing. It signals to a judge, and to the plaintiff at a settlement conference, that you've engaged seriously with the claim rather than reflexively rejecting all of it.

The debt was already paid or satisfied

Sometimes a claim is for a debt that was already paid, whether in full or in part, before the claim was filed. This defence depends heavily on proof of payment — bank records, e-transfer confirmations, receipts, or a written acknowledgment from the plaintiff. Verbal payment with no supporting record is a much harder position to establish, so if you've paid something informally, it's worth gathering whatever trace of it exists, even an old text message confirming receipt.

The limitation period has expired

Ontario's Limitations Act, 2002 generally sets a two-year limitation period for most claims, running from the day the plaintiff knew, or reasonably should have known, about the claim — not necessarily the day the underlying event happened. If a claim appears to have been filed well outside that window, expiry of the limitation period can be raised as a defence. See the full text of the Limitations Act, 2002 for the governing rules, since there are exceptions and nuances that can affect exactly when the clock started.

You weren't properly served, or named incorrectly

Service and naming issues are technical, but real. If you were never actually served in a way the court's rules recognize, or if the claim names the wrong legal entity entirely — suing you personally for a debt that was actually your corporation's, for instance — these are genuine issues worth raising specifically. That said, don't let a dispute over service or naming become a reason to ignore the claim altogether; if the issue turns out not to hold up, inaction in the meantime can still expose you to a default judgment. Address the issue actively, in writing, rather than through silence.

Set-off and Defendant's Claims

Sometimes the right response isn't just defending against what's alleged — it's pointing out that the plaintiff, or someone connected to the same dispute, actually owes you money too. A contractor who sues over an unpaid final invoice might be met with a defence that their own defective work caused the defendant additional repair costs. Depending on the specifics, this can be raised as a straightforward set-off against the amount claimed, or as a full Defendant's Claim within the same case. See our guide on preparing a defence for how this fits into the broader document you file.

The plaintiff's own conduct caused or contributed to the loss

In some disputes, the plaintiff's own actions played a role in the loss they're now claiming for. A landlord suing a former tenant for damage might be met with a defence that a maintenance request was ignored for months, worsening a problem that started small. This kind of defence doesn't necessarily eliminate what's owed, but it can meaningfully reduce it by shifting some responsibility back onto the plaintiff's own choices.

Combining more than one defence

Real disputes are rarely clean enough to fit inside a single defence, and there's no rule requiring you to pick just one. Consider an auto repair shop that sues a customer for $3,500, covering both a completed brake job and a transmission repair the customer says was never finished properly. The customer's Defence in this scenario could reasonably combine two of the defences above at once: admitting and paying for the brake job while disputing the transmission charge as unsatisfactory work, and separately noting that a $600 deposit already paid toward the transmission repair should be credited against whatever amount the court finds is actually owed.

Structuring a Defence this way — walking through each component of the claim and applying whichever defence genuinely fits that piece — tends to produce a far more convincing document than trying to force the entire dispute under one label. It also tends to make settlement conferences more productive, since both sides can see exactly which parts of the claim remain genuinely contested and which have effectively already been resolved by the pleadings themselves.

Arguments that generally don't work as defences

Just as important as knowing what can work is recognizing what generally doesn't, so you don't build your entire response around it:

• "I can't afford to pay." A real hardship, but not a legal defence to whether the amount is owed.
• "I didn't think they'd actually sue me." Surprise isn't a legal defence, and it won't undo a properly filed claim.
• "It's been so long I forgot about it." The passage of time can support a limitations defence in the right circumstances, but forgetting alone doesn't.
• "I'm a good person and wouldn't do that." Character alone rarely answers specific, documented allegations.

Defences at a glance

What to do next

1. Match your situation against the defences above and identify which genuinely apply.
2. Gather supporting documentation for each defence you plan to raise.
3. Check the timeline against Ontario's general two-year limitation period if the dispute is old.
4. Draft your Defence so it responds to each specific allegation, rather than relying on general disagreement.
5. Consider whether a Defendant's Claim applies if you believe money flows the other way too.

Frequently asked questions

This article is general legal information about how Ontario Small Claims Court generally works, not legal advice about your specific situation — see our disclaimer for more.