What Is the Business Judgment Rule?

The business judgment rule is the presumption that corporate directors who make a decision in good faith, on an informed basis, and without personal interest in the outcome will not be second-guessed by courts, even when the decision turns out badly. It exists because judges price hindsight accurately: businesses require risk, and directors who faced personal liability for every failed bet would take none.

California codifies the standard for directors in Corporations Code section 309, which requires good faith, the care of an ordinarily prudent person, and reasonable inquiry. The protection evaporates where its premises fail: self-dealing and conflicts of interest, decisions made with no meaningful investigation, fraud, or abdication of oversight. In those cases the burden shifts and the transaction gets real scrutiny.

Practically, the rule frames nearly every shareholder and LLC member lawsuit over management decisions. Plaintiffs work to show a conflict or willful blindness that strips the presumption; defendants work to show a clean, documented, disinterested process. Board minutes, advice from professionals, and disclosure of conflicts are what the fight is actually about.