- - A counterclaim says: "Even putting that aside, you owe me money" — a separate claim, arising out of the same or a related situation, that you're entitled to pursue against the person…
- A counterclaim fits naturally where the parties' dealings run in both directions.
- In the Superior Court's ordinary civil process, a defendant who wants to counterclaim generally does so as part of responding to the claim — asserting the counterclaim alongside the…
Being served with a debt claim doesn't always mean you're purely on defence. If the person or business suing you also owes you something — for deficient work, an unpaid balance of their own, or a separate breach of the same contract — Ontario procedure lets you raise that as a counterclaim inside the very case being brought against you, rather than starting an entirely separate lawsuit.
Used well, a counterclaim can shift the whole tone of a case: instead of just defending, you're also pursuing your own recovery in the same proceeding. Used carelessly, it can turn a simple, cheap case into a longer, costlier fight for both sides. Knowing when it actually fits your situation — and when a straightforward defence is enough — is the first decision to make.
Counterclaim vs. Defence: Not the Same Thing
It helps to separate two different ideas that often get blurred together:
- A defence says: "I don't owe you this money" — because you never agreed to pay, you already paid, the amount is wrong, the debt is out of time, or some other reason the plaintiff's claim should fail.
- A counterclaim says: "Even putting that aside, you owe me money" — a separate claim, arising out of the same or a related situation, that you're entitled to pursue against the person suing you.
A defendant can raise both at once. You can dispute the plaintiff's claim on the merits while also asserting your own claim against them arising from the same dealings.
When a Counterclaim Actually Makes Sense
A counterclaim fits naturally where the parties' dealings run in both directions. Common scenarios include:
- You're sued for an unpaid invoice, but the work or goods delivered were deficient, incomplete, or not what was agreed — giving you your own claim for damages.
- You're sued for a loan balance, but the lender separately owes you money under an unrelated but related arrangement.
- You're sued by a business partner or former partner, and you believe they breached the same agreement or owe you an accounting of funds.
- You're sued for a debt, but you paid amounts the plaintiff never credited, or you have a claim for a set-off — an amount that should be deducted from what you owe because of something the plaintiff did or failed to do.
A counterclaim is not the right tool for grievances that have nothing to do with the plaintiff's claim or your relationship with them — an unrelated dispute usually needs its own, separate action.
How It Works Procedurally
In the Superior Court's ordinary civil process, a defendant who wants to counterclaim generally does so as part of responding to the claim — asserting the counterclaim alongside the statement of defence, rather than waiting and filing something separate later. In Small Claims Court, a defendant with their own related claim against the plaintiff can similarly bring it within the same proceeding, using the court's own process for that purpose, rather than starting an entirely new file.
Once a counterclaim is filed, the case effectively runs as two intertwined claims decided together:
- The plaintiff's original claim proceeds as normal, with the defendant (now also a plaintiff-by-counterclaim) responding to it.
- The counterclaim proceeds on its own footing — the original plaintiff must now respond to it, just as any defendant would.
- Both claims are typically heard and decided at the same time, often at the same trial or hearing, rather than as two separate proceedings on two separate timelines.
- The final result can go either way on each claim independently — a defendant could defeat the original claim, succeed on the counterclaim, both, or neither.
What to Weigh Before Counterclaiming
| Consideration | Why it matters |
|---|---|
| Strength of your own claim | A weak counterclaim adds cost and complexity without improving your position |
| Whether it's genuinely related | Claims with no real connection to the plaintiff's case may not belong in the same proceeding |
| Added cost and time | A counterclaim generally extends the length and complexity of the case for both sides |
| Costs exposure | If you lose the counterclaim, you may face a costs award on it separately from the outcome of the original claim |
| Court level | A larger counterclaim amount could affect which court the whole matter needs to proceed in |
A counterclaim is a genuine litigation strategy, not an automatic add-on — it's worth assessing on its own merits before filing, ideally with legal advice.
A Quick Comparison
| Defence Alone | Defence + Counterclaim | |
|---|---|---|
| Goal | Defeat the plaintiff's claim | Defeat the plaintiff's claim AND recover your own damages |
| Complexity | Generally simpler | Generally more involved — two claims to prove and defend |
| Possible outcome | You owe nothing, or a reduced amount | You could owe nothing and also be awarded money from the plaintiff |
| Risk | Lower | Higher — you now bear the burden of proving your own claim too |
Frequently asked questions
Do I have to file a counterclaim, or can I sue separately later?
You generally aren't required to counterclaim — you can often pursue a genuinely separate claim on its own later, subject to the usual limitation period rules. But raising a truly related claim in the same case is often more efficient than running two overlapping lawsuits at different times.
What if my counterclaim is for more money than the plaintiff is claiming from me?
That's possible, but a significantly larger counterclaim amount can affect procedural questions, including which court level is appropriate for the whole matter. This is worth flagging to a lawyer early rather than after filing.
Can the plaintiff drop their claim once I file a counterclaim?
A plaintiff may be able to discontinue their own claim, but that generally doesn't make your counterclaim disappear — it can typically continue on its own, since it's now effectively its own claim within the file.
Is set-off the same thing as a counterclaim?
Not exactly. Set-off is usually raised as part of your defence — arguing an amount should be deducted from what's claimed — while a counterclaim is a separate, affirmative claim for damages of your own. The two can overlap depending on the facts, which is exactly the kind of nuance worth reviewing with a lawyer.
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