What "Fiduciary" Actually Means: RIA vs. Broker-Dealer

A fiduciary is legally obligated to put the client's interest ahead of its own. Registered investment advisers (RIAs) owe clients a fiduciary duty under the Investment Advisers Act of 1940: a duty of care and a duty of loyalty that applies to the entire relationship, at all times. Broker-dealers operate under a different standard, Regulation Best Interest, which applies at the moment a recommendation is made and does not make the broker a fiduciary. The difference is structural, not cosmetic, and it shapes how advice is produced and paid for.

What does it mean to be a fiduciary?

Fiduciary duty is the highest standard of care in American law. It is the standard that applies to trustees managing a trust, to executors settling an estate, and to investment advisers managing client portfolios.

Under the Advisers Act, the SEC has described the adviser's fiduciary duty as having two components. The duty of care requires advice that is in the client's best interest, based on a reasonable understanding of the client's objectives, along with suitable ongoing monitoring. The duty of loyalty requires the adviser to eliminate conflicts of interest or, at minimum, disclose them fully and fairly enough that a client can give informed consent.

Two features matter most in practice. First, the duty applies continuously, not just at the point of sale. Second, it covers the whole relationship: account recommendations, investment selection, fees, and the handling of conflicts.

What standard do broker-dealers follow?

Broker-dealers are governed by Regulation Best Interest (Reg BI), which the SEC adopted in June 2019 with a compliance date of June 30, 2020. Reg BI requires a broker-dealer to act in the best interest of a retail customer when recommending a securities transaction or investment strategy, and not to place the firm's financial interest ahead of the customer's.

Reg BI was a meaningful upgrade over the prior "suitability" standard, and it has four component obligations: disclosure, care, conflict of interest, and compliance. The SEC has been explicit, however, that Reg BI does not impose the Advisers Act fiduciary standard on broker-dealers. The obligation attaches when a recommendation is made. Between recommendations, a broker-dealer generally has no duty to monitor the account unless it has agreed to do so.

That design fits the brokerage business model, which is transactional: the firm is compensated when something is bought or sold. It is a legitimate model, and for some investors an episodic, commission-based relationship can cost less than an ongoing advisory fee. But it is a sales relationship with investor protections attached, not a continuous duty of loyalty.

Why does the difference matter in practice?

Consider a hypothetical example. An investor has $2,000,000 to invest in a diversified equity allocation.

At a broker-dealer, the representative might recommend Class A mutual fund shares carrying a front-end sales load plus an ongoing 12b-1 fee. Under FINRA rules, 12b-1 fees are capped at 1.00% annually, typically 0.25% on Class A shares. A 3.5% load at this asset level (loads often step down at breakpoints) would be $70,000 paid at purchase, plus roughly $5,000 per year in 12b-1 fees flowing to the distributor. The recommendation must be in the customer's best interest at the time it is made, but the broker has no general obligation to revisit it next year.

At an RIA charging, say, 0.75% on the same $2,000,000, the client pays roughly $15,000 per year, with no load and typically institutional-class funds or ETFs with no 12b-1 fees. The adviser owes a continuous duty to monitor, rebalance, harvest losses where appropriate, and advise on the account in the client's best interest the entire time.

Neither structure is automatically cheaper over every horizon; a true buy-and-hold investor who never wants advice again might pay less in the brokerage account. The point is that the legal duty, the compensation, and the incentive to pay attention all run in different directions under the two models.

What about firms that are both?

Many large financial firms are dually registered as both broker-dealer and investment adviser, and many of their representatives hold both licenses. The same person can act as a fiduciary adviser in your advisory account in the morning and as a broker earning a commission in your brokerage account in the afternoon. Each role carries a different legal standard.

This is legal and disclosed, but it puts the burden on the client to know which hat the professional is wearing for any given recommendation. A fee-only RIA, by contrast, acts under one standard in every interaction because it has only one registration and one revenue source: the fee its clients pay.

How do you verify what standard your adviser follows?

You do not have to take anyone's word for it. Three public documents answer the question.

• Form CRS. Since June 30, 2020, both broker-dealers and RIAs must deliver a short relationship summary describing their services, fees, conflicts, and disciplinary history in plain language. It states directly whether the firm is a broker-dealer, an investment adviser, or both.
• Form ADV. Every RIA files this with the SEC. Part 2A is the narrative brochure: fees, conflicts, compensation arrangements, and disciplinary events. It is free at adviserinfo.sec.gov.
• BrokerCheck. FINRA's database (brokercheck.finra.org) shows a broker's registrations, employment history, and customer complaints.

Then ask three questions in writing: Are you a fiduciary for me at all times, on all accounts? Do you or your firm receive any compensation from anyone other than me? Will you put your answers in writing? A fee-only fiduciary can answer yes, no, and yes without hesitation.

Key numbers

Frequently asked questions

Is a broker-dealer a fiduciary?Generally no. Reg BI requires a broker to act in a retail customer's best interest when making a recommendation, but the SEC has stated that Reg BI does not impose the Advisers Act fiduciary standard, which applies continuously.

What is the difference between fee-only and fee-based?Fee-only means the firm is compensated solely by client fees. Fee-based usually means the firm or its affiliates can also earn commissions or other third-party compensation, which reintroduces conflicts that fee-only firms avoid.

Did Regulation Best Interest make brokers and advisers equivalent?No. Reg BI raised the brokerage standard above the old suitability rule, but the two standards remain different in scope, duration, and the treatment of conflicts.

How can I check an adviser's record for free?Use adviserinfo.sec.gov for RIAs and brokercheck.finra.org for brokers. Both show registrations, disclosures, and disciplinary history at no cost.

Can the same person be both a broker and a fiduciary adviser?Yes. Dually registered representatives are common at large firms, and the applicable standard depends on the capacity in which they are acting for each recommendation. Form CRS must disclose the dual role.

Is fiduciary advice always better?A fiduciary standard aligns legal duty with the client's interest, which we believe matters. But standards do not replace judgment; competence, process, and fees still need to be evaluated on their own merits.