A plan fiduciary is any person or entity that exercises discretionary authority or control over an employee benefit plan governed by the Employee Retirement Income Security Act (ERISA), its assets, or its administration. The label doesn’t come from a job title or a formal appointment. It comes from what a person actually does with plan money and plan decisions. That functional test catches more people than most employers realize, and the consequences of getting caught unprepared are serious: personal liability for plan losses, civil penalties from the Department of Labor, excise taxes from the IRS, and potential removal by a court.
How You Become a Fiduciary Without Being Called One
ERISA uses a three-part functional test. You are a fiduciary to the extent you do any of the following with respect to a plan:
- Exercise discretionary authority or control over plan management, such as interpreting plan terms or deciding whether a participant qualifies for a benefit.
- Exercise authority or control over plan assets, including selecting or removing investment options, directing purchases of securities, or approving distributions.
- Have discretionary authority or responsibility in plan administration, such as processing claims that involve judgment calls or deciding appeals.
A consultant hired to recommend an investment lineup, an HR director who picks the recordkeeper, or a committee member who votes on plan changes can all become fiduciaries without anyone formally designating them as such.1U.S. Department of Labor. Fiduciary Responsibilities The test looks at conduct, not credentials. If you make the call, you own the call.
What Doesn’t Make You a Fiduciary
Not every plan-related decision triggers fiduciary status. ERISA draws a line between managing a plan (fiduciary) and designing or creating one (settlor). An employer deciding whether to offer a 401(k), choosing the vesting schedule, amending the plan to add a loan feature, or terminating the plan is acting as a settlor. These design-level decisions fall outside ERISA’s fiduciary rules.2U.S. Department of Labor. Guidance on Settlor v. Plan Expenses
The distinction matters. Settlor activities don’t carry personal ERISA liability, and their costs generally can’t be paid from plan assets. But the moment the employer shifts from designing the plan to implementing it — selecting specific investments, enrolling participants, processing contributions — the fiduciary hat goes on. Many plan sponsors cross that line without realizing it.
The Duties You’re Held To
ERISA imposes four interlocking obligations on every fiduciary. These are legally enforceable standards, not aspirational guidelines, and courts evaluate them when participants sue.
Prudence
The “prudent person” rule requires fiduciaries to act with the care, skill, and diligence that a knowledgeable person familiar with such matters would use in running a similar plan.3Office of the Law Revision Counsel. 29 USC 1104 – Fiduciary Duties Courts focus on the decision-making process, not just the outcome. A fiduciary who picks an investment that later loses money isn’t automatically liable. One who made the selection without researching alternatives, reviewing fees, or documenting the rationale almost certainly is. The process is the protection.
Loyalty
Every fiduciary action must be taken solely in the interest of plan participants and their beneficiaries, for the exclusive purpose of providing benefits and covering reasonable plan expenses.3Office of the Law Revision Counsel. 29 USC 1104 – Fiduciary Duties A fiduciary cannot subordinate participant interests to other objectives or sacrifice returns to promote goals unrelated to participant retirement income.4eCFR. 29 CFR Part 2550 – Rules and Regulations for Fiduciary Responsibility Steering plan business to a vendor because they’re friendly with the CEO, or picking higher-cost funds because they kick back revenue-sharing, violates this duty.
Diversification
Fiduciaries must spread plan investments to minimize the risk of large losses.3Office of the Law Revision Counsel. 29 USC 1104 – Fiduciary Duties Concentrating the plan in one stock, one industry, or the employer’s own securities is the kind of bet that gets fiduciaries sued. The only exception is when concentration is “clearly prudent,” which is a high bar that rarely applies.
Following the Plan Document
Fiduciaries must administer the plan according to its written terms, as long as those terms are consistent with ERISA.1U.S. Department of Labor. Fiduciary Responsibilities That means calculating benefits the way the plan says to calculate them, distributing funds on the schedule the plan describes, and not inventing rules that aren’t in the document. If a provision conflicts with ERISA, the statute wins. But fiduciaries can’t unilaterally override terms they simply disagree with.
The Different Fiduciary Roles
Most plans involve several people or entities sharing fiduciary responsibility, each with a distinct scope of authority. Liability follows the function.
Named Fiduciary
Every ERISA plan must identify at least one “named fiduciary” in its written plan document. This person or committee has authority to control and manage plan operations and administration.5Office of the Law Revision Counsel. 29 USC 1102 – Establishment of Plan The named fiduciary carries ultimate oversight responsibility. The plan document can allocate specific duties to others or authorize delegation, but delegation doesn’t eliminate accountability. The named fiduciary remains responsible for selecting and monitoring delegates prudently.
Plan Administrator
The plan administrator handles operational duties: filing Form 5500, distributing required disclosures, processing benefit claims, and maintaining records. If the plan document doesn’t name a specific administrator, the plan sponsor — typically the employer — defaults into this role automatically.6eCFR. 29 CFR 2510.3-16 – Definition of Plan Administrator Many employers don’t realize they’ve inherited this responsibility simply by failing to designate someone else in writing.
Investment Manager
An investment manager takes full discretionary control over selecting, monitoring, and replacing plan investment options. Only banks, insurance companies, and registered investment advisers qualify for this role, and the manager must acknowledge fiduciary status in writing. When a qualified investment manager is properly appointed, the employer or named fiduciary is no longer liable for the specific investment decisions that manager makes. They remain responsible, however, for choosing and overseeing the manager itself.
Co-Fiduciary Liability
A fiduciary doesn’t have to personally commit a violation to be on the hook for one. Under ERISA, you can be liable for another fiduciary’s breach if you knowingly participated in it or helped conceal it, if your own failure to meet fiduciary standards enabled the other person’s breach, or if you knew about the breach and didn’t make reasonable efforts to fix it.7Office of the Law Revision Counsel. 29 USC 1105 – Liability for Breach of Co-Fiduciary Looking the other way is itself a legal problem. A committee member who sees questionable transactions and stays silent is exposed to the same liability as the person who initiated them.
Transactions Fiduciaries Simply Cannot Do
Beyond the general duty standards, ERISA flatly bars certain dealings between a plan and people closely connected to it. These prohibited transactions apply regardless of whether the deal seems fair or even beneficial to the plan. The barred categories include sales or leases of property between the plan and a party in interest, loans or extensions of credit, providing goods or services, transferring plan assets to or using them for the benefit of a party in interest, and acquiring employer securities or real property beyond statutory limits.
A “party in interest” is a broad category: plan fiduciaries, service providers, the sponsoring employer, unions whose members participate, 50%-or-more owners of the employer, and relatives of any of these people.8Office of the Law Revision Counsel. 29 USC 1106 – Prohibited Transactions The net is cast wide on purpose.
Statutory exemptions allow certain otherwise-prohibited transactions, including participant loans (if available to everyone on similar terms, adequately secured, and at a reasonable interest rate), contracts for necessary services like legal or accounting work (if compensation is reasonable), and certain insurance contracts.9Office of the Law Revision Counsel. 29 USC 1108 – Exemptions From Prohibited Transactions The Secretary of Labor can also grant individual or class exemptions.
Prohibited transactions carry a separate tax penalty on top of any ERISA liability. The IRS imposes an initial excise tax of 15% of the amount involved for each year the violation continues. If the transaction isn’t corrected within the taxable period, an additional 100% tax kicks in.10Office of the Law Revision Counsel. 26 USC 4975 – Tax on Prohibited Transactions These excise taxes fall on the “disqualified person” rather than on a fiduciary acting solely in that capacity, but in practice the same person often wears both hats.
What Personal Liability Actually Means
ERISA enforcement has real teeth. A fiduciary who breaches any duty is personally liable to restore all losses the plan suffered as a result of the breach, return any profits made through improper use of plan assets, and submit to whatever other equitable relief a court deems appropriate, including removal from the fiduciary position.11Office of the Law Revision Counsel. 29 USC 1109 – Liability for Breach of Fiduciary Duty Personal liability means what it sounds like. Courts can reach a fiduciary’s own bank accounts and assets to make the plan whole. One saving grace: a fiduciary isn’t liable for breaches committed before they assumed the role or after they left it.
On top of restoring plan losses, the Department of Labor can impose a civil penalty equal to 20% of the amount recovered through a settlement or court judgment. The Secretary has discretion to waive or reduce this penalty if the fiduciary acted reasonably and in good faith, or if enforcing the full penalty would prevent full restoration of plan losses.12Office of the Law Revision Counsel. 29 USC 1132 – Civil Enforcement
Lawsuits for breach can be brought by plan participants, beneficiaries, other fiduciaries, or the Secretary of Labor. Any recovery goes to the plan itself, not to the individual who filed suit. A single participant’s lawsuit can therefore benefit every person in the plan.
There is a time limit. Claims must be brought by the earlier of six years from the date of the last action constituting the breach, or three years from the date the plaintiff first had actual knowledge of the violation. If the breach involved fraud or concealment, the window extends to six years from discovery.13Office of the Law Revision Counsel. 29 USC 1113 – Limitation of Actions The actual-knowledge standard is strict. Suspicion or constructive notice doesn’t start the three-year clock.
Fixing a Problem Before the DOL Finds It
Fiduciaries who discover a violation before the Department of Labor does have an option. The Voluntary Fiduciary Correction Program (VFCP) allows plan officials to self-report and fully correct certain fiduciary violations in exchange for avoiding a civil enforcement action. The program also provides conditional relief from excise taxes for certain prohibited transactions when corrections follow prescribed methods.14U.S. Department of Labor. Fact Sheet – Voluntary Fiduciary Correction Program Applicants can’t use the program if the plan or applicant is already under investigation. Correcting a late deposit of employee contributions voluntarily is far less expensive than having the DOL discover it during an audit.