By Pavel Kolmogorov, California Business Litigation Attorney (State Bar No. 321018). Founder of Kolmogorov Law, P.C., recognized in Chambers and Partners 2026 Spotlight Guide for Litigation: General Commercial in Orange County.

When a business partner diverts company funds, a corporate officer steals a business opportunity, or a trustee prioritizes personal interests over the beneficiary's, the legal claim is breach of fiduciary duty. In California, this cause of action carries some of the most powerful remedies available in civil litigation, including disgorgement of profits, punitive damages, and equitable relief.

This guide covers who owes fiduciary duties under California law, what those duties require, the four elements of a breach claim, the damages available, common defenses, and practical steps for business owners pursuing or defending these claims.

Who Owes Fiduciary Duties in California?

A fiduciary relationship exists whenever one person is authorized to act on another's behalf and the beneficiary places trust and confidence in the fiduciary. California law recognizes both formal fiduciary relationships (created by law or contract) and informal ones (arising from the circumstances of the relationship).

Formal fiduciary relationships include: general partners to each other and the partnership (Corp. Code § 16404); corporate officers and directors to the corporation and shareholders (Corp. Code § 309, § 7231); LLC managers to the LLC and its members (Corp. Code § 17704.09); trustees to beneficiaries (Prob. Code § 16000 et seq.); agents to principals (Civ. Code § 2322); attorneys to clients (Bus. & Prof. Code § 6068); and real estate agents to their principals.

Informal fiduciary relationships can arise in a variety of commercial contexts. California courts have recognized fiduciary duties in joint venture relationships, majority shareholder-to-minority shareholder relationships (Jones v. H.F. Ahmanson & Co. (1969) 1 Cal.3d 93), and in certain business relationships where one party exercises dominance or control over the other's affairs.

The Three Core Fiduciary Duties

Duty of care. A fiduciary must act with the care, diligence, and skill that a reasonably prudent person would exercise in similar circumstances. For corporate directors, this is codified in Corporations Code § 309(a). The duty of care requires informed decision-making: reviewing financial statements, attending meetings, asking questions, and investigating red flags. A director who rubber-stamps decisions without review may breach the duty of care even without bad intent.

Duty of loyalty. A fiduciary must act in the best interests of the beneficiary, not in the fiduciary's own interests. This means no self-dealing, no usurping business opportunities that belong to the entity, no competing with the entity, and full disclosure of any conflicts of interest. The duty of loyalty is the duty most frequently litigated in California business disputes, particularly in partnership and closely held corporation contexts.

Duty of good faith and fair dealing. This duty requires honesty, candor, and the absence of intent to defraud or seek unconscionable advantage. It overlaps with the duties of care and loyalty but serves as a separate basis for liability when a fiduciary acts with subjective bad faith.

The Four Elements of a Breach of Fiduciary Duty Claim

To prevail on a breach of fiduciary duty claim in California, the plaintiff must prove four elements (David Welch Co. v. Erskine & Tulley (1988) 203 Cal.App.3d 884):

•        Element 1: Existence of a fiduciary relationship. The plaintiff must establish that the defendant owed fiduciary duties, either through a formal legal relationship or through facts showing the defendant was in a position of trust, confidence, or control.

•        Element 2: Breach of the fiduciary duty. The plaintiff must show the fiduciary acted (or failed to act) in a manner inconsistent with the duties of care, loyalty, or good faith. Common examples include diverting assets, competing with the entity, concealing material information, or engaging in self-dealing transactions.

•        Element 3: Causation. The breach must have been a substantial factor in causing the plaintiff's harm. This is the standard proximate cause analysis applied in California tort cases.

•        Element 4: Damages. The plaintiff must prove actual harm resulting from the breach. However, in fiduciary duty cases, courts may award equitable remedies (disgorgement, constructive trust) even where traditional compensatory damages are difficult to quantify.

Damages and Remedies

Breach of fiduciary duty claims in California offer a broader range of remedies than most civil causes of action:

•        Compensatory damages for the actual financial loss caused by the breach.

•        Disgorgement of profits earned by the fiduciary through the breach, even if the beneficiary did not suffer a corresponding loss.

•        Constructive trust imposed on assets acquired through the breach.

•        Punitive damages if the breach involved oppression, fraud, or malice (Civ. Code § 3294). In fiduciary duty cases, the threshold for punitive damages is often lower in practice because the breach of trust itself may constitute the required "despicable conduct."

•        Attorney's fees may be recoverable under the terms of a partnership agreement, LLC operating agreement, or other contract that contains a fee-shifting provision.

•        Injunctive relief to prevent ongoing or threatened breaches, including orders to return property, cease competing, or stop soliciting company clients.

Common Defenses

•        Ratification and consent. If the beneficiary knew about the fiduciary's conduct and consented to it (or ratified it after the fact), the defense may bar the claim.

•        Business judgment rule. As noted above, this protects informed, good-faith decisions.

•        Statute of limitations. Breach of fiduciary duty claims based in fraud carry a 3-year statute of limitations under CCP § 338(d), with a discovery rule. Claims not based in fraud may be subject to a 4-year statute (CCP § 343) or the 2-year statute for general negligence (CCP § 339), depending on the nature of the duty.

•        In pari delicto. If the plaintiff participated equally in the wrongful conduct, the defense may apply to bar or reduce recovery.

Frequently Asked Questions

Q: Can a minority shareholder sue for breach of fiduciary duty in California?

A: Yes. In closely held corporations, majority shareholders owe fiduciary duties to minority shareholders. A minority shareholder can bring a direct action for breach of those duties, particularly where the majority has engaged in oppressive conduct, freeze-outs, or self-dealing transactions that disproportionately harm the minority.

Q: What is the statute of limitations for breach of fiduciary duty in California?

A: It depends on the nature of the claim. If the breach involves fraud or concealment, the statute is 3 years from discovery (CCP § 338(d)). For breaches not involving fraud, courts typically apply the 4-year residual statute (CCP § 343). The discovery rule delays the start of the limitations period until the plaintiff knew or should have known of the breach.

Q: Is breach of fiduciary duty the same as fraud?

A: Not exactly, though they frequently overlap. Fraud requires an intentional misrepresentation or concealment. Breach of fiduciary duty can arise from negligence (duty of care), self-dealing (duty of loyalty), or dishonesty (duty of good faith). However, when a fiduciary intentionally conceals the breach, the claim may be pled as both breach of fiduciary duty and fraud.

Q: Can an LLC manager be held personally liable for breach of fiduciary duty?

A: Yes. Under Corporations Code § 17704.09, an LLC manager owes fiduciary duties to the LLC and its members. A breach of those duties can result in personal liability, including compensatory damages, disgorgement, and potentially punitive damages.

Related California business-dispute guides

• California partnership buyouts — legal options when you want out, or want your partner out.
• What to do if your business partner steals from the company — recovery and remedies for partner theft.
• When a handshake deal goes wrong: silent partner fraud — a real-world look at uncovering hidden partnership misconduct.

Need help? Contact Kolmogorov Law, P.C. at (909) 235-6116 or visit the contact us page to schedule a consultation with our business litigation team in Irvine, California.