A breach of fiduciary duty happens when a person legally obligated to act in someone else’s interest instead acts for personal gain, hides information the other party needed, or mishandles the assets or decisions placed in their control. The duty is the strictest standard of conduct the law recognizes, and courts respond to violations with a wide range of remedies: money damages, forced return of profits, loss of fees, removal from the role, and in serious cases criminal charges. The same core rules apply whether the fiduciary is a trustee, a lawyer, a corporate director, a retirement plan administrator, or a financial advisor.
What a Fiduciary Owes
A fiduciary duty is more than a promise to deal fairly. It requires putting another person’s interests ahead of your own, and it breaks down into three obligations:
- Loyalty — no divided allegiances, no self-dealing.
- Care — informed, reasonably prudent decisions.
- Candor — volunteering any fact the other party would want to know before deciding.
Federal retirement law gives the clearest statutory picture of what this standard looks like in practice. Anyone managing an ERISA plan must act solely in the interest of participants, exercise the skill and diligence of a prudent person familiar with such matters, diversify investments to reduce the risk of large losses, and follow the plan’s governing documents.1GovInfo. 29 USC 1104 – Fiduciary Duties Those four requirements — exclusive purpose, prudence, diversification, and plan compliance — describe the general shape of fiduciary duty well beyond retirement plans.
Who Actually Owes These Duties
Fiduciary duties don’t attach to every business dealing. They arise where one person has discretion, control, or specialized knowledge and the other is dependent on that judgment. The most common fiduciary relationships are:
- Trustee and beneficiary.
- Attorney and client.
- Corporate directors and officers to the company and its shareholders.
- Investment advisers to their clients. Federal law bars advisers from using any device or scheme to defraud a client, engaging in transactions that operate as a fraud or deceit, or trading against a client’s interest without written disclosure and consent.2GovInfo. 15 USC 80b-6 – Prohibited Transactions by Investment Advisers
- ERISA plan administrators to plan participants.
- Court-appointed guardians to their wards.
- Agents to the principals who authorized them.
Some relationships come from formal agreements. Others arise automatically from how the parties interact. A financial advisor who takes discretionary control of a portfolio may owe fiduciary duties even without any document saying so.
What Counts as a Breach
A breach is any action, or any failure to act, that violates the duties of loyalty, care, or candor. It can be deliberate or careless. The categories below cover most situations that end up in court.
Self-Dealing and Conflicts of Interest
Self-dealing is the clearest breach: the fiduciary uses the position to benefit themselves at the beneficiary’s expense. ERISA flatly prohibits a plan fiduciary from dealing with plan assets for their own account, acting on behalf of a party whose interests conflict with the plan’s, or taking personal compensation from anyone doing business with the plan.3Office of the Law Revision Counsel. 29 USC 1106 – Prohibited Transactions No proof of actual harm is required. The transaction itself is the violation.
Conflicts of interest work the same way. A fiduciary with a financial stake in a transaction involving the beneficiary’s assets must disclose the conflict and obtain informed consent, or step aside. Doing neither is a breach even if the deal turned out to be objectively fair.
Failure to Disclose Material Information
A fiduciary has to volunteer information the other party would want to know. They can’t simply avoid lying when asked. A trustee learning that a major investment is deteriorating, an attorney discovering a conflict that affects strategy, or an advisor receiving third-party compensation for recommending a product all have to disclose without being prompted. Silence, when disclosure is required, is treated like an affirmative misrepresentation.
Mismanagement of Assets
A fiduciary managing money or property must use reasonable care and skill. For trustees, that means evaluating investments in the context of the whole portfolio and the beneficiary’s needs, risk tolerance, tax situation, and liquidity. A classic breach is concentrating a trust in a single stock when diversification was called for. Another is leaving assets in a low-yield account for years without reviewing whether a better approach exists. Inaction can be as much a breach as a bad decision.
Commingling Funds
Mixing a beneficiary’s money with the fiduciary’s own is a breach almost everywhere. Attorneys who combine client funds with operating accounts face disciplinary action up to disbarment. Trustees who blend trust assets with personal accounts expose the beneficiary to the trustee’s personal creditors and make accurate accounting impossible. Courts often treat commingling as a per se breach, so the fiduciary doesn’t get to argue no harm resulted.
Taking a Corporate Opportunity
Directors and officers who learn of a business opportunity through their role can’t take it for themselves. The opportunity has to be presented to the company first. Diverting it to a personal venture is a breach even if the company likely wouldn’t have pursued it.
Misusing Confidential Information
Fiduciaries routinely see sensitive material: trade secrets, financial data, legal strategy, health records. Using that information for personal advantage, sharing it with people who shouldn’t have it, or failing to protect it from disclosure all count as breaches. This category overlaps with self-dealing whenever the fiduciary trades on inside information.
What a Plaintiff Has to Prove
A breach of fiduciary duty claim has four elements, generally proven by a preponderance of the evidence (more likely than not):
- A fiduciary relationship existed between the parties.
- The fiduciary breached a specific duty of loyalty, care, or disclosure.
- The breach caused harm — a direct link between the misconduct and the injury.
- The plaintiff suffered real losses, whether in money, asset value, or lost opportunities.
Causation is where most cases get hard. Showing that a trustee invested poorly is one thing; proving how much the beneficiary would have had under a prudent strategy requires financial modeling, expert testimony, and almost always a fight over the numbers.
What a Court Can Order
Judges have broad discretion in these cases. The remedies go well beyond simple damages.
Compensatory Damages
The usual starting point is money equal to the losses the beneficiary suffered. Under ERISA, a fiduciary who breaches their duties is personally liable to restore any losses the plan suffered as a result.4Office of the Law Revision Counsel. 29 USC 1109 – Liability for Breach of Fiduciary Duty That can include lost profits, out-of-pocket losses, and the difference between what the beneficiary received and what they should have received.
Disgorgement of Profits
If the fiduciary profited from the misconduct, a court can order those profits turned over even when the beneficiary can’t show a matching loss. The focus is the fiduciary’s gain, not the plaintiff’s injury. A fiduciary who used trust assets for a personal investment that paid off must return the profit regardless of whether the trust itself lost anything.4Office of the Law Revision Counsel. 29 USC 1109 – Liability for Breach of Fiduciary Duty The rule is simple: fiduciaries don’t get to keep the fruits of disloyalty.
Fee Forfeiture
Courts can strip a disloyal fiduciary of compensation earned during the period of the breach. Fee forfeiture is distinct from disgorgement because it doesn’t require tracing specific profits. It removes the fiduciary’s right to be paid at all for services tainted by disloyalty. The remedy is especially common against attorneys and agents and can be imposed even when the plaintiff struggles to prove a precise dollar loss.
Equitable Relief
Beyond money, courts can order structural remedies. Injunctions can stop further harmful action. A constructive trust can be placed on specific property, forcing the fiduciary to transfer it. Rescission can unwind a transaction. And in many cases the court simply removes the fiduciary from the role — a trustee who self-deals, for instance, may lose the position entirely.4Office of the Law Revision Counsel. 29 USC 1109 – Liability for Breach of Fiduciary Duty
Punitive Damages and Criminal Liability
Some jurisdictions allow punitive damages when the conduct was willful, malicious, or grossly negligent. These awards punish rather than compensate. In the worst cases, especially those involving embezzlement, fraud, or theft of plan assets, a breach can also lead to criminal charges. ERISA provides criminal penalties including fines and up to ten years of imprisonment for willful violations, as well as for coercive interference with participants’ rights.
Attorney Fees
Most breach cases follow the American Rule, meaning each side pays its own lawyer. A prevailing plaintiff generally can’t recover fees on the fiduciary claim alone. Fees may be recoverable if the same conduct also supports a related contract claim or falls under a statute with a fee-shifting provision.
Defenses the Other Side May Raise
Anyone bringing or defending one of these claims should know the main defenses available.
The Business Judgment Rule
Corporate directors get the best-known shield. The business judgment rule presumes that directors who made a decision acted on an informed basis, in good faith, and in the honest belief that the decision served the company. A court won’t second-guess the outcome if the process was sound. The presumption collapses when the plaintiff shows self-interest, bad faith, grossly uninformed decisions, or complete abdication of oversight. The rule protects honest mistakes, not disloyalty or negligence.
Informed Consent
A fiduciary who fully disclosed a conflict and obtained the beneficiary’s informed consent before proceeding generally has a defense to a later claim based on that conflict. The disclosure must cover all material facts, not just the existence of a conflict, and courts examine whether the consent was truly voluntary given the power imbalance.
Reliance on Professional Advice
A fiduciary who relied in good faith on qualified accountants, lawyers, or consultants may defend against a claim of imprudence. The reliance has to be reasonable, and the fiduciary must have given the advisor accurate and complete information. Blindly following bad advice without any independent judgment doesn’t qualify.
Filing Deadlines
Every breach claim has a filing deadline. Miss it and the case is over no matter how strong the facts.
For ERISA plans, federal law sets two alternatives: six years from the last act that constituted the breach, or three years from when the plaintiff first had actual knowledge of the violation, whichever comes first. If the fiduciary committed fraud or actively concealed the breach, the deadline becomes six years from the date the plaintiff discovered it.5Office of the Law Revision Counsel. 29 USC 1113 – Limitation of Actions
For non-ERISA claims — against trustees, attorneys, corporate directors — statutes of limitations vary by state, generally running between two and six years. Many states apply a discovery rule that starts the clock when the plaintiff knew or reasonably should have known about the breach rather than when it occurred. That matters because beneficiaries typically trust the fiduciary and don’t scrutinize what they’re doing. A trustee quietly siphoning funds may go undetected for years. Not every state applies the discovery rule to fiduciary claims, and some have explicitly excluded them, so getting a legal evaluation quickly is the only way to avoid losing a case to a deadline you didn’t know existed.
Tax Consequences of a Recovery
Winning or settling one of these cases creates a tax bill that catches many plaintiffs off guard. The Internal Revenue Code defines gross income as “all income from whatever source derived,” which sweeps in most litigation proceeds.6Office of the Law Revision Counsel. 26 USC 61 – Gross Income Defined
The main exclusion is for damages received on account of personal physical injuries or physical sickness.7Office of the Law Revision Counsel. 26 USC 104 – Compensation for Injuries or Sickness Breach of fiduciary duty claims are financial disputes, so compensatory damages are almost always taxable as ordinary income. Emotional distress damages are taxable unless they reimburse actual medical expenses. Punitive damages are always taxable.
Settlement agreements should describe the character of each payment, but the IRS isn’t bound by labels that lack economic substance.8IRS. Tax Implications of Settlements and Judgments Talk with a tax professional before finalizing any settlement in a fiduciary case.