California Bar Fiduciary Duties
Last updated: May 2, 2026
Fiduciary Duties questions are one of the highest-leverage areas to study for the California Bar. This guide breaks down the rule, the elements you need to recognize, the named traps that catch most students, and a memory aid that scales to test day. Read it once, then practice the same sub-topic adaptively in the app.
The rule
Directors and officers of a corporation owe the corporation and its shareholders fiduciary duties of care and loyalty. The duty of care requires acting in good faith, with the care an ordinarily prudent person would use, and in a manner reasonably believed to be in the corporation's best interests; informed business judgments are protected by the business judgment rule (BJR). The duty of loyalty prohibits self-dealing, usurpation of corporate opportunities, and competing with the corporation, and California requires conflict transactions to satisfy Cal. Corp. Code §310 (disinterested approval after disclosure, or fairness). Controlling shareholders owe minority shareholders a duty of good faith and fairness when they cause the corporation to act, and partners owe each other and the partnership the utmost duty of loyalty and care under Cal. Corp. Code §16404 (RUPA).
Elements breakdown
Duty of Care (Directors/Officers)
A director or officer must discharge their duties in good faith, with the care of an ordinarily prudent person in like position, and in a manner reasonably believed to be in the corporation's best interests.
- Act in good faith
- Use ordinary prudent person care
- Reasonable belief action benefits corporation
- Be reasonably informed before deciding
Common examples:
- Reading board materials before voting
- Reasonable reliance on officers, counsel, or experts
- Attending board meetings regularly
Business Judgment Rule (BJR)
A rebuttable presumption that directors acted on an informed basis, in good faith, and in the honest belief the action was in the corporation's best interests; if the presumption holds, courts will not second-guess the decision.
- No conflict of interest
- Acted in good faith
- Reasonably informed decision
- Rational basis for the decision
Common examples:
- Approving a strategic acquisition after due diligence
- Declining to pursue litigation after committee review
Duty of Loyalty — Self-Dealing / Conflict Transactions (Cal. Corp. Code §310)
A transaction between the corporation and a director (or an entity in which the director has a material financial interest) is voidable unless cleansed by disclosure plus disinterested approval, or shown to be just and reasonable to the corporation.
- Material financial interest disclosed
- Approval by disinterested directors or shareholders
- Or transaction is just and reasonable
- Burden on interested director if not cleansed
Common examples:
- Director sells real estate to the corporation
- Director's wholly-owned LLC contracts with corporation
Duty of Loyalty — Corporate Opportunity Doctrine
A director or officer may not divert to personal use a business opportunity that is within the corporation's line of business or that the corporation has an interest or expectancy in, without first offering it to the corporation.
- Opportunity in corporation's line of business
- Corporation financially able to undertake
- Full disclosure to the board
- Board rejection before personal taking
Common examples:
- Tech CEO buys a competing startup for herself
- Real estate director acquires adjacent parcel personally
Duty of Loyalty — Competing With the Corporation
A director or officer may not compete with the corporation in its line of business without disclosure and consent.
- Competing business in same line
- Use of corporate resources, information, or contacts
- No disclosure or consent
- Harm or risk of harm to corporation
Controlling Shareholder Fiduciary Duty
A shareholder who controls the corporation owes minority shareholders a duty of good faith and inherent fairness when causing the corporation to act, particularly in parent-subsidiary dealings, freeze-out mergers, and sales of control.
- Defendant is a controlling shareholder
- Defendant caused corporation to act
- Action benefits controller at minority's expense
- Failure of entire fairness (fair price + fair process)
Common examples:
- Squeeze-out merger at unfair price
- Parent diverting subsidiary opportunities
Partner Fiduciary Duties (Cal. Corp. Code §16404 — RUPA)
Partners owe the partnership and each other the duties of loyalty and care; loyalty includes accounting for profits, refraining from self-dealing adverse to the partnership, and not competing.
- Account for partnership profits/property
- No adverse interest to partnership
- No competition with partnership
- Care: no gross negligence, recklessness, or intentional misconduct
Common examples:
- Partner pockets a kickback from a supplier
- Partner starts a competing firm pre-dissolution
Duty of Good Faith (LLCs and Closely Held Entities)
Members and managers of an LLC, and partners in close partnerships, owe a duty of good faith and fair dealing in performance and enforcement of the operating/partnership agreement.
- Existence of contractual or fiduciary relationship
- Conduct frustrating reasonable expectations
- Lack of honesty in fact
- Resulting harm to entity or co-owners
Common patterns and traps
The BJR Misapplication Trap
A wrong choice invokes the business judgment rule to insulate a transaction in which a director had a material financial stake. The BJR only applies when the decision-maker is disinterested, informed, and acted in good faith; self-dealing knocks out the presumption entirely. Candidates who reflexively cite the BJR whenever a board approves a transaction get burned.
"The directors are protected by the business judgment rule because they reasonably believed the contract benefited the company." — but the director on the other side of the contract destroys the presumption.
The Corporate Opportunity Cleansing Skip
A wrong choice lets a director or officer keep a diverted opportunity merely because the corporation later thrived or because the director paid fair value. The doctrine requires prior disclosure and rejection by a disinterested board; a post-hoc fairness gloss does not cure the breach.
"The director may keep the property because she paid fair market value and the corporation suffered no loss."
The California §310 Omission
A wrong choice analyzes a conflict transaction under generic common-law fairness without invoking Cal. Corp. Code §310's specific cleansing pathways (disinterested director approval, disinterested shareholder approval, or just-and-reasonable). On a California essay, naming §310 and walking its three pathways is what separates a passing answer from a marginal one.
"The contract is enforceable because it was fair to the corporation." — true under common law, but skips the §310 framework graders expect.
The Controlling-Shareholder Confusion
A wrong choice treats a controlling shareholder as if she owes only the duties of a director (or none at all because she is "just a shareholder"). Controlling shareholders owe minority shareholders a duty of good faith and entire fairness when they cause the corporation to act for their benefit.
"The shareholder owed no duty to the minority because shareholders are free to vote their shares in self-interest."
The Care-Loyalty Conflation
A wrong choice analyzes a self-dealing transaction under the duty of care (was the director informed? did she act prudently?) rather than under loyalty. Loyalty issues require a different framework — cleansing or entire fairness — and the BJR is off the table.
"The director breached her duty of care because she did not adequately investigate the transaction's terms." — when the real issue is her undisclosed financial interest.
How it works
Start every fiduciary-duty issue by naming the actor and the duty owed. If a director approves a transaction in which she has a financial stake, you are in loyalty territory and the BJR drops out — the transaction is voidable unless cleansed under Cal. Corp. Code §310 by disclosure plus disinterested approval, or shown to be just and reasonable. If the director merely made a bad business call with no conflict, you stay in care territory and the BJR shields the decision so long as she was reasonably informed and acted in good faith. Imagine Reyes, a director of Liu Robotics, Inc., who learns the company is hunting for a warehouse and quietly buys a suitable property herself, then leases it back to the company at market rates: that is the corporate opportunity doctrine, and Reyes loses unless she first disclosed and the disinterested board declined. The recurring trap is collapsing care and loyalty — graders want you to separate them, name the duty, and then run the cleansing or BJR analysis as a discrete step.
Worked examples
Will the shareholder succeed in voiding the lease?
- A Yes, because any contract between a corporation and one of its directors is voidable as a matter of law.
- B Yes, because the business judgment rule does not apply to transactions in which a director has a financial interest.
- C No, because Patel disclosed her interest and the transaction was approved by a majority of disinterested directors under Cal. Corp. Code §310. ✓ Correct
- D No, because Patel acted as an ordinarily prudent person would in disclosing her interest before the vote.
Why C is correct: Cal. Corp. Code §310 cleanses an interested-director transaction when the material facts of the director's interest are disclosed and the contract is approved in good faith by a vote of a majority of disinterested directors. Patel disclosed her ownership of Patel Holdings, recused herself, and the six disinterested directors approved after comparing competing bids. That satisfies §310's first cleansing pathway, so the lease is not voidable on loyalty grounds.
Why each wrong choice fails:
- A: Self-dealing transactions are not automatically void or voidable in California; §310 expressly provides cleansing pathways through disclosure plus disinterested approval or proof of fairness. This choice ignores the statutory framework. (The California §310 Omission)
- B: It is true the BJR does not by itself shield a self-interested director, but the lease here is independently cleansed by §310 disinterested-director approval. The shareholder's claim fails on cleansing grounds, not on the BJR. (The Care-Loyalty Conflation)
- D: This frames the issue as duty of care (prudence in disclosure) when the operative analysis is duty of loyalty cleansed under §310. Disclosure alone, without disinterested approval or fairness, would not save the transaction. (The Care-Loyalty Conflation)
Is Reyes likely to be held liable for breach of fiduciary duty?
- A No, because Reyes used her own funds and Liu Biotech suffered no out-of-pocket loss.
- B No, because the corporation might not have been able to close the transaction on the same timeline.
- C Yes, because Reyes diverted a corporate opportunity without first disclosing it to the board and obtaining its rejection. ✓ Correct
- D Yes, because any purchase of a competitor by a director constitutes per se self-dealing.
Why C is correct: Under the corporate opportunity doctrine, a director or officer may not appropriate for personal use an opportunity in the corporation's line of business without first disclosing it to the board and giving the corporation a chance to accept or reject it. The diagnostic startup was squarely within Liu Biotech's stated acquisition criteria, and Reyes never disclosed it. Her after-the-fact arguments about fairness or feasibility do not cure the breach, and she must disgorge the profit.
Why each wrong choice fails:
- A: Use of personal funds and absence of out-of-pocket loss are irrelevant; the doctrine targets the diversion itself, not whether the corporation suffered direct expense. This is the classic post-hoc fairness gloss the doctrine refuses to credit. (The Corporate Opportunity Cleansing Skip)
- B: Speculation about whether the corporation could have closed the deal does not substitute for the required prior disclosure-and-rejection process. Financial ability is one factor, but the burden is on the director to first present the opportunity to the board. (The Corporate Opportunity Cleansing Skip)
- D: There is no per se rule barring directors from buying competitors; the analysis turns on the corporate opportunity doctrine and the duty against competing, both of which require fact-specific application. Overstating the rule produces the wrong reason even if the outcome is correct. (The BJR Misapplication Trap)
What is the minority shareholder's strongest theory of liability?
- A Sandoval Holdings, as a controlling shareholder, breached its duty of good faith and entire fairness to the minority. ✓ Correct
- B Sandoval Holdings violated the business judgment rule by failing to investigate the merger price.
- C Sandoval Holdings is liable for ordinary negligence in setting the merger price too low.
- D Sandoval Holdings owed no duty because shareholders are free to vote their shares in their own self-interest.
Why A is correct: A controlling shareholder who causes the corporation to engage in a self-interested transaction — particularly a freeze-out merger — owes the minority a duty of good faith and entire fairness, encompassing both fair price and fair process. Sandoval set the price at $14 while sitting on a $22 appraisal it never disclosed, and used its voting power to ram the deal through. That is a textbook entire-fairness failure on both prongs, and the burden is on Sandoval to prove fairness.
Why each wrong choice fails:
- B: The BJR governs disinterested director decisions, not a controlling shareholder's self-interested cash-out merger. Invoking the BJR here misidentifies the actor and the doctrine. (The BJR Misapplication Trap)
- C: Controlling-shareholder liability sounds in breach of fiduciary duty under the entire-fairness standard, not in ordinary negligence. Framing it as negligence concedes the wrong burden of proof and the wrong remedy. (The Care-Loyalty Conflation)
- D: While shareholders generally may vote their own interests, that freedom contracts sharply once a shareholder becomes a controller and causes the corporation to act for the controller's benefit at the minority's expense. This is the classic mistake of treating a controller as a passive holder. (The Controlling-Shareholder Confusion)
Memory aid
"CLOC-G": Care, Loyalty, Opportunity, Competition, Good faith — and for any conflict, run the §310 cleansing checklist (Disclose, Disinterested approval, or Demonstrate fairness).
Key distinction
Duty of care + no conflict = BJR shields the decision; duty of loyalty (any material self-interest) = BJR is unavailable and the burden shifts to the fiduciary to prove cleansing or entire fairness.
Summary
Identify the fiduciary, name the duty (care vs. loyalty), and decide whether the BJR shields the decision or whether the actor must prove cleansing under §310 or entire fairness.
Practice fiduciary duties adaptively
Reading the rule is the start. Working California Bar-format questions on this sub-topic with adaptive selection, watching your mastery score climb in real time, and seeing the items you missed return on a spaced-repetition schedule — that's where score lift actually happens. Free for seven days. No credit card required.
Start your free 7-day trialFrequently asked questions
What is fiduciary duties on the California Bar?
Directors and officers of a corporation owe the corporation and its shareholders fiduciary duties of care and loyalty. The duty of care requires acting in good faith, with the care an ordinarily prudent person would use, and in a manner reasonably believed to be in the corporation's best interests; informed business judgments are protected by the business judgment rule (BJR). The duty of loyalty prohibits self-dealing, usurpation of corporate opportunities, and competing with the corporation, and California requires conflict transactions to satisfy Cal. Corp. Code §310 (disinterested approval after disclosure, or fairness). Controlling shareholders owe minority shareholders a duty of good faith and fairness when they cause the corporation to act, and partners owe each other and the partnership the utmost duty of loyalty and care under Cal. Corp. Code §16404 (RUPA).
How do I practice fiduciary duties questions?
The fastest way to improve on fiduciary duties is targeted, adaptive practice — working questions that focus on your specific weak spots within this sub-topic, getting immediate feedback, and revisiting items you missed on a spaced-repetition schedule. Neureto's adaptive engine does this automatically across the California Bar; start a free 7-day trial to see your sub-topic mastery climb in real time.
What's the most important distinction to remember for fiduciary duties?
Duty of care + no conflict = BJR shields the decision; duty of loyalty (any material self-interest) = BJR is unavailable and the burden shifts to the fiduciary to prove cleansing or entire fairness.
Is there a memory aid for fiduciary duties questions?
"CLOC-G": Care, Loyalty, Opportunity, Competition, Good faith — and for any conflict, run the §310 cleansing checklist (Disclose, Disinterested approval, or Demonstrate fairness).
What's a common trap on fiduciary duties questions?
Applying BJR to self-dealing transactions
What's a common trap on fiduciary duties questions?
Skipping the §310 cleansing analysis
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