Breach of Warranty Discovered After Closing: An Ontario Buyer's Options

You bought the business relying on a set of specific statements the seller made in the purchase agreement. Weeks or months later, you learn one of them wasn't true. Maybe a contract the seller said was fully assignable actually needed consent nobody obtained. Maybe the financial statements weren't prepared the way the agreement said they were.

This is a breach of warranty — and while it can feel like grounds to tear up the deal, Ontario purchase agreements are generally built to channel this situation toward a specific, narrower set of remedies. Here's how to think through your options.

First: Confirm It's Actually a Breach

Not every disappointment is a breach. Check the exact wording of the representation against what you're seeing:

• Did the seller actually warrant this specific thing, or are you extending a general statement further than it was written to go?
• Is there a materiality qualifier ("in all material respects") or a knowledge qualifier ("to the seller's knowledge") that narrows what was actually promised?
• Was the issue disclosed somewhere in the disclosure schedule, even if you didn't focus on it at signing? Disclosed matters are usually carved out of the warranty's protection.

If the representation was accurate as written, or the issue was properly disclosed, you may not have a breach at all — however unfair the situation feels commercially.

If it does look like a genuine breach, the next question is what you can actually do about it. Ontario purchase agreements generally point to one of three outcomes.

Rescission — Rarely Available Post-Closing

Unwinding the entire transaction and putting both sides back where they started is, generally, a difficult remedy to obtain once a deal has closed and the business has been operated by the buyer for any length of time. Most purchase agreements aren't built around this outcome, and courts are typically reluctant to unwind a completed, operating transaction absent unusual circumstances.

An Indemnity Claim — The Standard Path

Most purchase agreements are drafted so that a breach of representation or warranty gives rise to an indemnity claim — a claim for money to compensate the loss the breach caused — rather than a claim to void the deal. This is usually the buyer's primary, and often exclusive, contractual remedy.

The "Sole Remedy" Question

Many agreements include a clause stating that the indemnity provisions are the buyer's exclusive remedy for breach of the agreement, subject to specific carve-outs (fraud is a common one). Whether other legal claims — outside the four corners of the contract — remain available depends entirely on how that clause is worded and what the specific facts are. This is a genuinely fact-specific legal question, not something to assume either way.

Working Through It in Practice

1. Identify the specific representation the facts appear to breach, and read it alongside any qualifiers and the disclosure schedule.
2. Check the survival period for that representation — has the window to bring a claim already closed?
3. Quantify your loss — what has this actually cost you, in dollars, not just in principle?
4. Check the basket and cap — does the loss clear the minimum threshold, and does the total claim fit within the negotiated ceiling?
5. Give notice in the form and timeframe the agreement requires.
6. Decide your escalation path — negotiation, drawing on a holdback, the agreement's dispute mechanism, or litigation if the agreement's remedies don't adequately address the situation.

Frequently asked questions