What is a Fiduciary?

ProjectionLab
4 min readUpdated Aug 15, 2026Aug 15, 2026

A fiduciary must act in your best interest, not their own. Learn which advisors are fiduciaries, how the standard differs from suitability, and how to verify.

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A fiduciary is a person or organization legally obligated to act in someone else’s best interest rather than their own. In financial advice, that obligation is the dividing line between someone required to recommend what is best for you and someone required only to recommend something suitable.

The distinction has practical consequences. A non-fiduciary advisor can recommend a fund that pays them a commission over a nearly identical fund that does not, provided the recommendation is suitable. A fiduciary cannot.

The Duties a Fiduciary Owes

Fiduciary obligation is usually described as two core duties.

The duty of loyalty requires putting the client’s interests ahead of the advisor’s own. Conflicts of interest must be avoided where possible and disclosed where not.

The duty of care requires acting with the skill and diligence a prudent professional would apply in the same circumstances. This covers the quality of the advice itself, not just the advisor’s motives.

Breaching either can carry legal consequences, including liability for resulting losses.

Who Is Actually a Fiduciary

The label is applied loosely in marketing, so it is worth knowing which relationships carry the obligation by law.

Registered Investment Advisers (RIAs) and their representatives are fiduciaries under the Investment Advisers Act of 1940. They are required to act in your best interest at all times.

Broker-dealers are not held to the same standard. Under Regulation Best Interest, which took effect in 2020, they must act in the retail customer’s best interest when making a recommendation, but the obligation attaches to the recommendation rather than to the relationship as a whole.

Certified Financial Planner (CFP) professionals commit to a fiduciary duty when providing financial advice as a condition of their certification.

Retirement plan sponsors and trustees are fiduciaries with respect to plan assets under the Employee Retirement Income Security Act (ERISA).

Some advisors operate in both capacities depending on the transaction, which is why asking whether someone is a fiduciary at all times is more useful than asking whether they are a fiduciary at all.

Fiduciary Duty Beyond Financial Advice

The concept extends well past investment management. A trustee administering a trust owes fiduciary duty to its beneficiaries. An executor owes it to an estate. Corporate directors owe it to shareholders. An agent under a power of attorney owes it to the person who granted it.

In each case the structure is the same: one party has been given authority over another’s assets or decisions, and the law responds by constraining how that authority can be used.

How to Verify Someone’s Status

Ask directly whether the advisor is a fiduciary at all times and in writing. An advisor bound by the standard will have no difficulty confirming it.

Compensation structure is the other signal worth understanding. Fee-only advisors are paid solely by clients, which removes product-based incentives. Fee-based advisors charge fees and may also earn commissions. Commission-based advisors are paid by product sales. The structure does not determine fiduciary status by itself, but it tells you where the conflicts sit.

You can also check an advisor’s registration and disciplinary history through public regulatory databases before engaging them. If you are looking for someone who works this way, you can find a fiduciary advisor in the ProjectionLab advisor directory.

Frequently Asked Questions

Is my financial advisor a fiduciary? Not necessarily. Registered Investment Advisers and CFP professionals providing financial advice are; many broker-dealer representatives are not, or are only when making specific recommendations. Ask for confirmation in writing.

What is the difference between fiduciary and suitability standards? A fiduciary must recommend what is best for you. A suitability standard requires only that a recommendation be appropriate for your situation, which permits recommending a more expensive product when a cheaper equivalent exists.

Does fee-only mean fiduciary? They usually overlap but are not the same thing. Fee-only describes how an advisor is paid; fiduciary describes the legal standard they are held to. Most fee-only advisors are fiduciaries, but confirm rather than assume.

Can an advisor be a fiduciary only some of the time? Yes, and this is a common source of confusion. An advisor may act as a fiduciary when providing planning advice and in a different capacity when selling a product. Asking whether they are a fiduciary at all times resolves it.

What happens if a fiduciary breaches their duty? They can be held legally liable for losses caused by the breach, and may face regulatory action. Remedies depend on the relationship and the governing law.

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