Definition
An ERISA fiduciary is any person or entity that exercises discretionary authority over a covered employee benefit plan's management, its assets, or the administration of the plan, and who is therefore subject to the duties and liability standards set by Title I of the Employee Retirement Income Security Act.
Why it matters
Fiduciary status is what triggers the substantive duties ERISA imposes — the duty of loyalty to participants, the prudent expert standard, the diversification requirement, and the duty to operate the plan in accordance with its governing documents. The status is defined by function rather than title: whether a person is an ERISA fiduciary depends on what they actually do with respect to the plan, not on how the plan documents label them.
How it works
Under ERISA Section 3(21), a person is a fiduciary to the extent they exercise any discretionary authority or control over the management of the plan; exercise any authority or control over the management or disposition of plan assets; render investment advice for a fee, direct or indirect, with respect to plan assets, or have any authority or responsibility to do so; or have any discretionary authority or responsibility in the administration of the plan. Fiduciary status is scope-specific and functional — a person can be a fiduciary for some purposes (e.g., selecting investment options) and not others (e.g., routine ministerial recordkeeping). The duties owed by a fiduciary appear principally in Section 404 and include the exclusive-benefit rule, the prudent expert standard, diversification, and adherence to plan documents. Personal liability under Section 409 attaches to a fiduciary who breaches these duties, with remedies including make-whole restoration and other equitable relief. Multiple fiduciaries typically coexist for a single plan — the named fiduciary designated in the plan document, investment committee members, investment managers appointed under Section 3(38), the plan administrator, and any third-party service providers who exercise discretion.
In practice
For a plan participant, the practical significance of ERISA fiduciary status is that decisions about the plan's investment menu, the reasonableness of plan fees, and the selection of any in-plan lifetime income option are all subject to enforceable duties owed to the participant, with civil remedies available through Section 502. For an individual serving on a plan committee or advising the plan, understanding whether the role carries fiduciary status is a threshold question — the functional definition means that documenting the scope of authority matters more than the title on the appointment letter. A professional evaluating any recommendation from a service provider should note whether the provider is acting in a fiduciary capacity or a non-fiduciary capacity with respect to the specific decision, because the applicable standard of care and the available remedies differ. Plan sponsors and committee members typically obtain fiduciary liability insurance to address the personal exposure that attaches to fiduciary status.
In the Longevity Standard Framework
The Longevity Standard plan-sponsor-facing scenario library entries are constructed to function as analytical infrastructure that a fiduciary can cite and reproduce, not as recommendations.
Related terms
- Employee Retirement Income Security Act
- Named fiduciary
- ERISA Section 404
- Prudent expert standard
- Exclusive benefit rule
- Fiduciary breach
- Fiduciary liability insurance
- Co-fiduciary liability