A fiduciary is a person or entity legally required to act in someone else’s best interest rather than their own. The category is broad: trustees, executors, registered investment advisers, retirement plan managers under ERISA, corporate directors and officers, attorneys, legal guardians, agents under a power of attorney, and healthcare proxies all qualify. The obligations are enforceable duties backed by federal and state law, not courtesies, and breaching them can lead to personal liability, removal, and civil penalties.
What Being a Fiduciary Actually Requires
Every fiduciary, regardless of role, owes a core set of duties. They overlap, but each addresses a distinct risk.
Loyalty
The duty of loyalty means the fiduciary puts the beneficiary’s interests ahead of their own in every decision. A trustee cannot steer trust assets into an investment that benefits the trustee’s side business. A corporate director cannot divert a profitable deal to a personal venture. Courts routinely order fiduciaries who breach loyalty to hand over any profits gained through the breach and make the injured party financially whole.
Care
The duty of care requires the fiduciary to act with the prudence and diligence a reasonable person would use managing their own affairs. That means doing genuine research, consulting qualified professionals when needed, and documenting the reasoning behind major decisions. A fiduciary who rubber-stamps a risky investment without reviewing the underlying financials has likely breached this duty. Courts evaluate the decision-making process, not just the outcome. A well-researched decision that happens to lose money is treated very differently from a reckless one.
Good Faith and Disclosure
Good faith runs through every other duty. It requires honesty, transparency, and a genuine intent to serve the beneficiary. Fiduciaries must disclose material facts that could affect a beneficiary’s interests, including conflicts of interest, fee structures, and risks tied to a course of action. Concealing information or misleading a beneficiary is treated as seriously as outright theft in many courts. Most jurisdictions treat good faith as part of the duty of loyalty rather than a wholly separate obligation.
Impartiality
When a trust or similar arrangement has more than one beneficiary, the fiduciary must balance competing interests fairly. A trustee managing assets for both a surviving spouse and adult children from a prior marriage cannot favor one group over the other unless the trust document explicitly authorizes it. The duty comes up constantly in estate planning, where income beneficiaries who want high current returns and remainder beneficiaries who want long-term growth have naturally opposing goals.
Who Counts as a Fiduciary
Trustees and Executors
Trustees and executors (sometimes called personal representatives) are the fiduciaries most people encounter. A trustee manages assets held in a trust for named beneficiaries. An executor settles a deceased person’s estate through probate.
Both roles carry real personal risk. A trustee who mismanages trust funds or an executor who fails to pay estate debts in the correct order can be surcharged, meaning they pay the losses out of their own pocket. Beneficiaries can demand a formal accounting at any time to verify assets are being handled properly, and courts take those requests seriously.
Fiduciaries managing investment portfolios are also held to the Uniform Prudent Investor Act, which nearly every state has adopted in some form. It requires fiduciaries to evaluate investments in the context of the entire portfolio rather than judging each asset in isolation. A single volatile stock isn’t automatically a problem if it’s part of a diversified strategy appropriate for the beneficiary’s needs. Relevant factors include balancing risk and return, accounting for inflation, considering tax consequences, and maintaining enough liquidity to meet anticipated expenses.
Registered Investment Advisers
Registered Investment Advisers owe a fiduciary duty to clients under the Investment Advisers Act of 1940. The Act makes it unlawful for any investment adviser to employ a scheme to defraud clients, engage in transactions that operate as fraud or deceit, or trade in their own account with client funds without written disclosure and consent.1Office of the Law Revision Counsel. 15 USC 80b-6 – Prohibited Transactions by Investment Advisers The Supreme Court interpreted these provisions in SEC v. Capital Gains Research Bureau (1963) as imposing a broad fiduciary duty requiring advisers to act in clients’ best interest at all times, not only when making specific recommendations.
An “investment adviser” under the Act is anyone who, for compensation, engages in the business of advising others on the value of securities or the advisability of buying or selling them.2Office of the Law Revision Counsel. 15 USC 80b-2 – Definitions Lawyers and accountants whose investment advice is incidental to their main practice, and brokers who receive no special compensation for advice, are excluded.
ERISA Retirement Plan Fiduciaries
Anyone who exercises discretionary authority over a retirement plan’s management or assets is a fiduciary under the Employee Retirement Income Security Act. That includes plan administrators, investment committee members, and outside consultants hired to select fund options. ERISA requires these fiduciaries to act solely in the interest of participants and beneficiaries, use the care and skill of a prudent person familiar with such matters, diversify investments to minimize the risk of large losses, and follow the plan documents to the extent they comply with the law.3Office of the Law Revision Counsel. 29 USC 1104 – Fiduciary Duties
ERISA also explicitly prohibits self-dealing. A fiduciary cannot use plan assets for their own benefit, act on behalf of a party whose interests conflict with the plan’s, or receive personal compensation from any party involved in a plan transaction.4Office of the Law Revision Counsel. 29 USC 1106 – Prohibited Transactions These are bright-line prohibitions, and even unintentional violations can trigger significant penalties.
Where Broker-Dealers Fit
This is where most people get tripped up. A broker-dealer is not a fiduciary. Since June 2020, broker-dealers have been subject to SEC Regulation Best Interest (Reg BI), which requires them to act in a retail customer’s best interest when making a recommendation, but only at the moment of the recommendation itself.5eCFR. 17 CFR 240.15l-1 – Regulation Best Interest A registered investment adviser’s fiduciary duty, by contrast, applies to the entire advisory relationship on an ongoing basis.6U.S. Securities and Exchange Commission. Staff Bulletin: Standards of Conduct for Broker-Dealers and Investment Advisers Conflicts of Interest
The practical difference matters. A broker-dealer under Reg BI must disclose conflicts and avoid placing their financial interests ahead of the customer’s, but is not required to eliminate conflicts altogether. An investment adviser fiduciary must either eliminate conflicts or make full disclosure so the client can give informed consent.6U.S. Securities and Exchange Commission. Staff Bulletin: Standards of Conduct for Broker-Dealers and Investment Advisers Conflicts of Interest If someone tells you they follow a “best interest” standard, ask whether they are a fiduciary or a broker-dealer subject to Reg BI. The labels sound similar; the legal protections are not.
Corporate Directors and Officers
Corporate directors and officers owe fiduciary duties to the corporation and its shareholders. Most states base their corporate governance laws on the Model Business Corporation Act, which requires directors to act in good faith, with reasonable care, and in a manner they believe serves the corporation’s best interests. Self-dealing and diverting corporate opportunities for personal gain are classic violations. Shareholders who believe directors have breached their duties can file a derivative lawsuit on behalf of the corporation.
Attorneys
Attorneys owe fiduciary duties to their clients under the professional conduct rules adopted in their jurisdiction, most of which are modeled on the ABA Model Rules of Professional Conduct.7American Bar Association. Model Rules of Professional Conduct: Preamble and Scope An attorney must protect client confidences, provide candid advice free from outside influence, and avoid representing clients with conflicting interests without informed consent. Violations can lead to professional discipline, including suspension or disbarment, and civil liability for financial harm caused.
Guardians, Agents, and Healthcare Proxies
Legal guardians, agents appointed under a power of attorney, and healthcare proxies also serve as fiduciaries. A guardian manages the personal and financial affairs of someone a court has found unable to do so themselves. An agent under a power of attorney acts on behalf of the person who granted the authority (the principal). A healthcare proxy makes medical decisions when the principal cannot. All three must follow the principal’s known wishes and, where those wishes are unclear, act in the principal’s best interest. Courts can remove any of them for mismanagement, neglect, or acting against the interests of the person they serve.
How Someone Becomes a Fiduciary
Fiduciary relationships arise in three main ways.
The most straightforward is by written agreement. A trust document names a trustee, a client signs an advisory contract with a registered investment adviser, or a person executes a power of attorney designating an agent. These agreements typically spell out the scope of the fiduciary’s authority and the specific assets or decisions they control.
The second path is by operation of law. Certain roles automatically carry fiduciary status regardless of whether the parties signed anything. Corporate directors owe fiduciary duties to shareholders the moment they join the board. An attorney-client relationship creates fiduciary obligations as soon as representation begins. ERISA fiduciary status attaches to anyone who exercises discretionary control over a retirement plan’s assets, even if the job title does not include the word “fiduciary.”3Office of the Law Revision Counsel. 29 USC 1104 – Fiduciary Duties
The third path is implied by the circumstances. Courts sometimes find a fiduciary relationship exists without a contract or statutory mandate when one party placed significant trust in another who had superior knowledge or control. A longtime financial adviser who informally managed an elderly client’s entire portfolio could be held to fiduciary standards even without a formal advisory agreement. Courts look at the actual dynamics of the relationship rather than its labels.
How to Confirm Whether a Financial Professional Is a Fiduciary
Don’t assume someone is a fiduciary just because they call themselves a “financial adviser.” The Department of Labor recommends asking direct questions: Are you willing to act as a fiduciary? Will you disclose any conflicts of interest? Will you put that commitment in writing?8U.S. Department of Labor. How to Tell Whether Your Adviser is Working in Your Best Interest: A Fiduciary Guide for Individual Consumers Also ask how they’re compensated, whether they earn higher fees for recommending certain products, and whether they’ll provide a written list of all fees and commissions.
You can verify credentials independently. The SEC’s Investment Adviser Public Disclosure (IAPD) database lets you search for any registered investment adviser and view their Form ADV filing, which contains information about the firm’s business operations, fee structures, and any disciplinary history.9U.S. Securities and Exchange Commission. IAPD – Investment Adviser Public Disclosure The database also searches FINRA’s BrokerCheck system and will indicate whether the entity is a brokerage firm rather than an investment adviser. Every broker-dealer and registered investment adviser must deliver a Form CRS (Client Relationship Summary) to retail investors, disclosing whether the firm is acting as a broker-dealer, an investment adviser, or both, and what standard of conduct applies.10U.S. Securities and Exchange Commission. Form CRS
What Happens When a Fiduciary Breaches the Duty
Consequences vary by context but share a common thread: the fiduciary bears personal responsibility for the harm caused.
Under ERISA, a fiduciary who breaches any duty is personally liable to restore any losses the plan suffered and to return any profits made through misuse of plan assets. Courts can also impose additional equitable relief, including removing the fiduciary from their position.11Office of the Law Revision Counsel. 29 USC 1109 – Liability for Breach of Fiduciary Duty The same principle applies in trust law, estate administration, and corporate settings: a breaching fiduciary must make the injured party whole and give up any personal gains.
ERISA violations also carry layered civil penalties. For prohibited transactions like self-dealing, the Department of Labor can assess a penalty of up to 5% of the amount involved for each year the violation continues. If the fiduciary fails to correct the transaction within 90 days of receiving notice, that penalty jumps to as much as 100% of the amount involved. Separately, for any fiduciary breach resolved through a DOL settlement or court order, the Secretary of Labor is required to assess an additional penalty equal to 20% of the recovery amount.12Office of the Law Revision Counsel. 29 USC 1132 – Civil Enforcement
There are deadlines to act. Under ERISA, a lawsuit for breach of fiduciary duty must generally be filed within six years of the last action that constituted part of the breach, or within three years of the date the plaintiff first had actual knowledge of the violation, whichever comes first. If the fiduciary committed fraud or actively concealed the breach, the deadline extends to six years from the date of discovery.13Office of the Law Revision Counsel. 29 USC 1113 – Limitation of Actions Outside of ERISA, statutes of limitations for fiduciary breach claims vary by state, but most fall in the range of two to six years.