A fiduciary is a person or institution legally required to act in someone else’s best interest rather than their own. The relationship arises wherever the law recognizes a special bond of trust: a financial advisor managing your investments, an executor settling an estate, a trustee holding property for your benefit, a 401(k) plan administrator, an agent under a power of attorney, or a corporate director acting for shareholders. Because that trust is enforceable, a fiduciary who puts personal gain ahead of your welfare can be sued, ordered to repay losses, forced to give up profits, and removed from the role.
The label matters. Many professionals who sound like they are on your side are held to a lower standard. Knowing when you are dealing with a fiduciary — and what that person actually owes you — is the difference between a vague expectation of fairness and a legal right you can enforce.
The Core Duties a Fiduciary Owes You
Fiduciary relationships look different across contexts, but the same handful of obligations show up in federal statutes, state law, and court decisions.
Duty of care. A fiduciary must act with the skill and diligence a reasonable, knowledgeable person would use in the same situation. Under ERISA, for example, a retirement plan fiduciary must use the care and prudence of someone “familiar with such matters” running “an enterprise of a like character and with like aims.”1Office of the Law Revision Counsel. 29 USC 1104 – Fiduciary Duties In practice, that means researching options, weighing risks, and documenting the reasoning before making decisions with someone else’s money or property.
Duty of loyalty. The beneficiary’s interests come first. Self-dealing — profiting from a transaction at the beneficiary’s expense — is the most common violation. When a conflict of interest exists, the fiduciary must disclose it fully and, in many cases, obtain the beneficiary’s consent before going forward.
Duty of good faith. A fiduciary must act with honest intentions and cannot use the position to advance interests that conflict with the beneficiary’s welfare. A pattern of bad-faith conduct has been treated by courts as grounds for removal and damages.
Duty of disclosure. A fiduciary must share information the beneficiary needs to make informed decisions, including risks, fees, and conflicts. Withholding material facts is generally treated as seriously as providing false ones.
Who Counts as a Fiduciary
The clearest way to understand what a fiduciary is is to look at the roles the law treats this way.
Trustees. A trustee holds legal title to property for the benefit of named beneficiaries. The trustee must follow the trust document, invest prudently, make distributions as directed, and keep accurate records. Personal funds and trust assets cannot be mixed. If a trustee mismanages the trust, a court can impose a surcharge requiring personal repayment of lost value, and beneficiaries can petition to have the trustee removed.
Executors. An executor (sometimes called a personal representative) manages a deceased person’s estate. The executor gathers assets, notifies creditors, pays debts and expenses, files required tax returns, and distributes what remains according to the will. Estate funds cannot be used for personal expenses, and heirs cannot be favored without a legal basis.
Agents under a power of attorney. When you sign a power of attorney, the agent you name becomes a fiduciary with duties similar to a trustee’s. The agent must act loyally, stay within the authority you granted, avoid conflicts of interest, keep your property separate from their own, and document receipts, disbursements, and other actions taken on your behalf. If you chose the agent because of professional expertise — an accountant or attorney, say — courts may hold them to a higher standard. An agent who acts within authority and uses reasonable care is generally not liable for market losses, but one who exceeds authority, self-deals, or fails to keep records can be removed and held liable.
Guardians and conservators. When a court decides someone cannot manage their own affairs, it may appoint a guardian for personal decisions or a conservator for financial ones. Unlike agents, these fiduciaries are chosen by the court and remain under court supervision. They must file reports, typically within 90 days of appointment and annually afterward, and may need court approval for major decisions like selling property. A few states also require professional guardians and conservators to be licensed.
Retirement plan fiduciaries. If you have a 401(k), pension, or similar employer plan, the people running it are fiduciaries under the Employee Retirement Income Security Act (ERISA). Plan administrators, trustees, and investment committee members must act solely in the interest of participants and beneficiaries.1Office of the Law Revision Counsel. 29 USC 1104 – Fiduciary Duties Plan investments must be diversified to minimize the risk of large losses unless it is clearly prudent not to, and fees must be reasonable. ERISA also bars specific prohibited transactions, such as using plan assets for personal benefit, receiving outside compensation in connection with a plan transaction, or lending between the plan and the employer.2Office of the Law Revision Counsel. 29 USC 1106 – Prohibited Transactions When a 401(k) lets participants direct their own investments, the plan fiduciary generally is not liable for losses from a participant’s choices, but remains responsible for selecting and monitoring the menu of options.
Corporate directors and officers. Directors and officers owe fiduciary duties to the corporation and its shareholders. They must make decisions they honestly believe serve the company, disclose personal conflicts, and avoid taking corporate opportunities for private gain. In mergers and acquisitions, directors are expected to conduct thorough due diligence so shareholders receive fair value, and minority shareholders are protected from tactics that unfairly dilute their ownership.
Partners. General partners owe fiduciary duties to one another. Opportunities within the partnership’s scope must be shared rather than taken privately, and partnership property and information cannot be used for personal gain. A partner who breaches these duties can be sued for damages and forced to give up any profits earned through the breach.
Not Every Financial Advisor Is a Fiduciary
This is where the term causes the most confusion. Whether the professional giving you investment advice owes you fiduciary duties depends on how they are registered.
Registered Investment Advisers
Registered investment advisers (RIAs) are governed by the Investment Advisers Act of 1940.3GovInfo. Investment Advisers Act of 1940 Under that law, an investment adviser owes you a fiduciary duty across the entire advisory relationship, not only when making a specific recommendation. That means ongoing suitable advice based on your situation, disclosure of all material conflicts of interest, and seeking best execution of trades when the adviser selects brokers for you.4Federal Register. Commission Interpretation Regarding Standard of Conduct for Investment Advisers Section 206 of the Act specifically prohibits the adviser from being on the other side of a client’s trade without first disclosing that conflict in writing and getting the client’s consent. “Best execution” is not simply the lowest commission; the SEC has clarified that the adviser must weigh execution quality, financial responsibility, and the full range of a broker’s services to maximize overall value for the client.5Securities and Exchange Commission. Compliance Issues Related to Best Execution by Investment Advisers
Broker-Dealers
Broker-dealers execute securities transactions and may recommend products, but they are not held to the full fiduciary standard. Before 2020, they operated under a “suitability” standard that only required recommendations to match a client’s general financial situation. Regulation Best Interest (Reg BI) took effect in June 2020 and raised that bar: broker-dealers must now act in the retail customer’s best interest at the time of a recommendation and cannot place their own financial interests ahead of the customer’s. Reg BI has four components: a disclosure obligation covering fees, services, and conflicts; a care obligation requiring reasonable diligence before a recommendation; a conflict-of-interest obligation requiring written policies to identify and manage conflicts; and a compliance obligation requiring internal procedures to enforce the other three.6eCFR. 17 CFR 240.15l-1 – Regulation Best Interest Even so, Reg BI applies only to specific recommendations, not to the ongoing relationship, so it stops short of the full fiduciary standard that applies to RIAs.
How to Check Whether Your Advisor Is a Fiduciary
Ask directly, then verify. Two free tools let you check independently.
Every registered investment adviser and broker-dealer must file a Form CRS (Client Relationship Summary) with the SEC. The two-page document states whether the firm is registered as an investment adviser (fiduciary) or a broker-dealer, along with the fees, services, and conflicts involved. You can look it up through the SEC’s Investment Adviser Public Disclosure database.
FINRA’s BrokerCheck lets you search any broker or brokerage firm by name or registration number and shows current employer, employment history for the past ten years, licenses held, registration status, and qualification exams passed.7Investor.gov. Using BrokerCheck Someone registered only as a broker-dealer follows Reg BI, not the full fiduciary standard. Someone registered as an investment adviser owes you fiduciary duties for advisory services.
Investment advisers must also give you a Form ADV Part 2 brochure. The SEC’s own instructions for the form state that an investment adviser “is a fiduciary and must make full disclosure to your clients of all material facts relating to the advisory relationship,” including all material conflicts of interest.8SEC.gov. Appendix C Part 2 of Form ADV Reading the brochure before you sign anything is the most direct way to see what conflicts exist and how the adviser handles them.
Fiduciary Bonds in Estate and Guardianship Cases
Courts can require an executor, trustee, guardian, or conservator to obtain a fiduciary bond before taking control of assets. The bond functions like insurance for beneficiaries: if the fiduciary mishandles property, the beneficiary can file a claim with the bond company. The fiduciary pays for the bond, and the cost depends on the value of the assets and the fiduciary’s creditworthiness. A poor credit history or criminal record can prevent someone from getting a bond, which may disqualify them from serving. A will can sometimes waive the bond requirement for an executor, but when a living person is incapable of managing their own assets, courts almost always require one for the appointed fiduciary.
What Happens When a Fiduciary Breaks the Rules
If a fiduciary violates their duties, the remedies depend on the context. The most common are monetary damages for losses, disgorgement of any profits the fiduciary gained through the breach, removal from the role, and court orders stopping further harmful conduct. In trusts and estates, a court can surcharge the fiduciary, requiring personal repayment of lost value. Some courts impose a constructive trust on property the fiduciary obtained improperly, which effectively transfers those assets to the rightful beneficiary.
Time limits for filing a claim vary. Under ERISA, you generally must sue within six years of the last action that was part of the breach, or within three years of when you first learned of the violation, whichever comes first. If the fiduciary concealed the breach, the deadline extends to six years from the date you discovered it.9Office of the Law Revision Counsel. 29 USC 1113 – Limitation of Actions Outside ERISA, state statutes of limitation for breach of fiduciary duty claims typically run from two to six years, with the exact period and starting point depending on the type of relationship and the jurisdiction. If you suspect a breach, the clock is already running, and talking to a lawyer early protects your options.