The Business Judgment Rule in Ontario: How Courts Review Director Decisions

Every director eventually makes a call that looks wrong in hindsight — a product launch that flops, a lease signed just before the market turned, an expansion funded at the wrong moment. When that happens, shareholders sometimes ask whether the director can be held personally responsible for the loss. The answer usually turns on what Ontario lawyers and courts call the business judgment rule — the principle that courts generally defer to a good-faith business decision rather than second-guessing it after the fact.

This article explains what that deference actually covers, what it doesn't, and what a director can do before a decision is made to stay on the right side of the line.

Why Courts Defer to Business Decisions

Running a business involves risk. If courts routinely replaced a director's judgment with their own — reviewing every decision with the benefit of hindsight — few people would agree to serve on a board at all. So Ontario courts, like courts across Canada, generally start from the position that a business decision made honestly, on a reasonable information base, and free of any conflict of interest deserves respect, even if it later turns out badly.

This is not a rule that shields directors from every consequence. It is a standard of review — it tells a court how closely to scrutinize the decision-making process, not whether the outcome was profitable.

The Two Duties Behind the Rule

Directors of an Ontario corporation — whether incorporated under the Business Corporations Act (Ontario) or the federal Canada Business Corporations Act — owe two related duties:

• A fiduciary duty — to act honestly and in good faith, with a view to the best interests of the corporation.
• A duty of care — to exercise the degree of care, diligence, and skill that a reasonably prudent person would exercise in comparable circumstances.

The business judgment rule really speaks to how a court assesses whether the duty of care was met. It asks whether the director followed a reasonable process, not whether a smarter director might have chosen differently.

When a Court Is Likely to Defer

When a Court Is Less Likely to Defer

The rule offers little protection where the process itself was flawed. Courts look much harder at decisions made:

• Without gathering basic, readily available information.
• In bad faith, or to benefit a director personally rather than the corporation.
• With an undisclosed conflict of interest.
• On a rushed or effectively non-existent deliberation, with no real board discussion at all.
• In a way that ignored the corporation's own governing documents, such as a unanimous shareholder agreement restricting how a decision could be made.

In those situations, a court is examining the substance of the decision rather than simply deferring to it — a much harder position for a director to defend.

Protecting Yourself Before You Decide

Directors cannot eliminate risk, but they can build a record that supports deference later:

• [ ] Document the information reviewed and the reasoning behind the decision in board minutes.
• [ ] Disclose any personal or financial interest in the matter before the vote.
• [ ] Get outside professional advice (legal, financial, technical) where the decision calls for expertise the board doesn't have.
• [ ] Confirm the decision is consistent with the corporation's articles, by-laws, and any shareholder agreement.
• [ ] Allow genuine discussion rather than rubber-stamping a decision already made informally.

A thin paper trail is one of the most common weaknesses that surfaces later, whether in a shareholder dispute or in due diligence for a future financing or sale.

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