What Is a Fiduciary? Why It Matters Now
The DOL fiduciary rule just died again. Here is what fiduciary means, how it differs from Reg BI, and what to ask your advisor.
On March 10, 2026, the Department of Labor formally withdrew its Retirement Security Rule, the second time in less than a decade that a federal fiduciary rule died in court. The rule, finalized in April 2024, was blocked by two Texas federal courts and officially vacated this March. With that withdrawal, ERISA’s original five-part test for fiduciary status is once again the default standard for retirement advice.
For millions of retirement savers, this means the rules governing retirement advice just got murkier. Not all financial advisors operate under the same legal standard, and the differences between those standards are not small. Understanding what fiduciary actually means, and whether your advisor is one, has never been more relevant.
What Is a Fiduciary?
A fiduciary is a person or firm that is legally required to act in a client’s best interest. The term comes from the Latin fiducia, meaning trust, and it carries real legal weight. A fiduciary must put the client’s interests ahead of their own, even when that means earning less in fees or commissions.
Under the Investment Advisers Act of 1940, registered investment advisers (RIAs) are held to a fiduciary standard by law. That standard includes four core obligations:
- Duty of loyalty. The advisor must act in the client’s best interest and avoid conflicts of interest. When conflicts exist, they must be fully disclosed.
- Duty of care. The advisor must provide advice that is prudent and appropriate given the client’s financial situation, goals, and risk tolerance.
- Full fee transparency. The advisor must clearly disclose how they are compensated, including any fees, commissions, or revenue-sharing arrangements.
- Ongoing obligation. The fiduciary duty applies continuously, not just at the moment a product is sold.
This is the highest standard of care in the financial advisory industry.
How Does the Fiduciary Standard Differ From Other Advisor Standards?
Not every financial professional who gives advice is a fiduciary. In 2026, there are three distinct standards that govern how advisors interact with clients:
| Fiduciary (RIA) | Reg BI (Broker-Dealer) | Suitability (Legacy) | |
|---|---|---|---|
| Legal standard | Must act in client’s best interest at all times | Must act in client’s best interest at the time of recommendation | Recommendation must be “suitable” for the client |
| Governing law | Investment Advisers Act of 1940 | SEC Regulation Best Interest (2019, effective 2020) | FINRA rules |
| Conflicts of interest | Must be eliminated or fully disclosed and managed | Must be disclosed; mitigation required but not elimination | Disclosure required |
| Compensation model | Typically fee-only or fee-based | Commission-based, fee-based, or hybrid | Commission-based |
| Ongoing duty | Yes, continuous | No, applies at point of recommendation | No, applies at point of sale |
| Who it covers | Registered investment advisers | Broker-dealers and their registered representatives | Broker-dealers (pre-Reg BI transactions) |
The practical differences matter. Under a fiduciary standard, an advisor who recommends a high-fee mutual fund when a lower-cost index fund would serve the client equally well could face legal liability. Under the suitability standard, that same recommendation could pass muster as long as the fund was broadly appropriate for the client’s profile.
Regulation Best Interest (Reg BI), adopted by the SEC in 2019 and effective June 2020, raised the bar for broker-dealers above the old suitability standard. It requires brokers to act in a client’s “best interest” at the time of a recommendation and to disclose conflicts, but it stops short of the continuous obligation that defines fiduciary duty for RIAs.
Why Does the DOL Rule’s Withdrawal Matter?
The DOL’s Retirement Security Rule would have extended a fiduciary standard to a broader set of retirement advice interactions, including one-time rollover recommendations. An employee rolling over a $500,000 401(k) at retirement is making one of the most consequential financial decisions of their life, and the standard governing that advice now depends entirely on who is giving it.
With the rule withdrawn, an RIA giving rollover advice is still bound by fiduciary duty. A broker-dealer is governed by Reg BI. The difference in legal protection is real, and the SEC’s FY2026 examination priorities for RIAs signal that regulators are paying close attention to how advisors handle conflicts and fee disclosures.
How Do I Know if My Advisor Is a Fiduciary?
This is one of the most important questions a person can ask before hiring a financial advisor, and one of the least commonly asked. Here are several ways to find out:
Check their registration. You can verify whether an advisor is registered as an investment adviser through the SEC’s Investment Adviser Public Disclosure database or through BrokerCheck for broker-dealer affiliations.
Ask directly. “Are you a fiduciary, and will you put that in writing?” is a reasonable question. Advisors who are fiduciaries will typically confirm without hesitation.
Read the Form ADV. Every RIA is required to file a Form ADV with the SEC, which discloses the firm’s services, fee structure, conflicts of interest, and disciplinary history. Part 2A is written in plain English and is the single most useful document for understanding how an advisor operates.
Look at the compensation model. Fee-only advisors are compensated exclusively by client fees, with no commissions from product sales. The compensation model does not determine fiduciary status by itself, but fee-only RIAs have the fewest structural conflicts of interest.
What Else Should I Ask a Prospective Advisor?
Beyond the fiduciary question, a few more worth asking before signing anything: How are you compensated, and are there any commissions or revenue-sharing arrangements? What are my total costs, including fund expense ratios? Do you have any conflicts of interest I should know about?
These questions apply regardless of whether someone is evaluating an RIA, a broker-dealer, or a hybrid advisor. A good advisor will answer all of them clearly. For a deeper look at the full evaluation process, our guide on how to choose a financial advisor covers credentials, fee structures, and red flags. And if you are still weighing whether professional advice is worth the cost, this post on whether you need a financial advisor breaks down when it tends to pay for itself.
The Bottom Line
The regulatory environment for financial advice in 2026 is fragmented. Three different standards govern how advisors interact with clients, and the failure of the DOL’s Retirement Security Rule means that gap is not closing anytime soon. For anyone choosing an advisor, understanding the difference between fiduciary duty and lesser standards is not a technicality. It is a practical question about whose interests come first.
Ferrante Capital LLC is a registered investment adviser. Information presented is for educational purposes only and does not constitute investment advice, a solicitation, or a recommendation to buy or sell any security. All investing involves risk, including the possible loss of principal.
FC and its principals may hold positions in securities or asset classes discussed in this article. This analysis is for educational purposes only and does not constitute a recommendation to buy, sell, or hold any security.
Forward-looking statements reflect Ferrante Capital’s current analysis and involve assumptions and estimates. Actual results may differ materially. Past performance is not indicative of future results.
Please consult a qualified financial professional before making investment decisions.
