Investment Adviser Fiduciary Duty: Rules & Compliance

Every investment adviser registered under the Investment Advisers Act owes its clients a federal fiduciary duty that comprises a duty of care and a duty of loyalty. The duty is enforced through Section 206 of the Advisers Act and its content is set out authoritatively in the SEC's 2019 Commission Interpretation (Release IA-5248). It cannot be waived, and an adviser's compliance program is where a firm proves it is being met.

That last point is the one most treatments miss. Law-firm memos explain the doctrine, and glossaries define the terms, but the operational question for a CCO is different: what must your program contain so that the duty is not just true on paper but provable at exam? This guide states the duty accurately, gets the source chain right, and then maps each piece of it to the controls and records that demonstrate compliance.

What is the investment adviser fiduciary duty?

An investment adviser is a fiduciary to its clients. In the words of the 2019 Interpretation, "the fiduciary duty an investment adviser owes to its client under the Advisers Act, which comprises a duty of care and a duty of loyalty, is important to the Commission's investor protection efforts."

Those two components carry a lot of weight, so it helps to state them plainly:

• Duty of care is about the quality of the advice and the diligence behind it: advice in the client's best interest, best execution, and advice and monitoring appropriate to the relationship.
• Duty of loyalty is about conflicts. An adviser must not put its own interests ahead of the client's, and must eliminate or fully and fairly disclose conflicts so the client can consent to them with eyes open.

The SEC frames the best-interest obligation as an overarching principle that "encompasses both the duty of care and the duty of loyalty." The duty applies to the entire advisory relationship, and it scales with what the adviser agreed to do. A one-time financial plan and an ongoing discretionary mandate carry the same duty; what differs is how it applies.

Where the duty comes from

Getting the source right matters, because thin pages tend to imply the Advisers Act contains a tidy "fiduciary duty" clause. It does not.

Section 206 of the Advisers Act is an antifraud provision. It makes it unlawful for an adviser to defraud clients or engage in transactions that operate as a fraud or deceit. It does not use the word "fiduciary," and it does not enumerate a duty of care and a duty of loyalty. The federal fiduciary standard was read into Section 206 by the Supreme Court in SEC v. Capital Gains Research Bureau, Inc., 375 U.S. 180 (1963), which construed the statute as reflecting congressional intent to hold advisers to fiduciary standards. The 2019 Interpretation then articulates what that duty requires, describing itself as interpreting "certain aspects of the fiduciary duty that an investment adviser owes to its clients under section 206 of the Advisers Act."

So the correct citation chain is: Section 206 (the enforceable hook), as construed in Capital Gains (the fiduciary standard), as articulated in the 2019 Interpretation (the content). If a page tells you the duty of care and duty of loyalty are "codified in Section 206," it has the doctrine wrong.

One consequence for drafting client agreements is that the duty follows the relationship and can be shaped, but not disclaimed. The Interpretation is explicit that an adviser's federal fiduciary duty "may not be waived, though it will apply in a manner that reflects the agreed-upon scope of the relationship." You can define the scope of your services by agreement, with full and fair disclosure and informed consent. You cannot write a term that says you will not act as a fiduciary, or that waives all conflicts in advance.

The duty of care

The Interpretation gives the duty of care three named components: "the duty to provide advice that is in the best interest of the client, (ii) the duty to seek best execution of a client's transactions where the adviser has the responsibility to select broker-dealers to execute client trades, and (iii) the duty to provide advice and monitoring over the course of the relationship."

Read operationally, each has a compliance footprint:

• Best-interest advice requires a reasonable understanding of the client's objectives and a reasonable belief that the advice is in the client's best interest based on that profile. For a program, that means a documented client profiling process and a reasonable basis for recommendations.
• Best execution applies where the adviser selects the broker-dealer. It is not a one-time judgment; it is a periodic, documented review of execution quality against alternatives.
• Advice and monitoring scales with the relationship. The SEC is direct that the duty here turns on scope. An ongoing asset-based-fee relationship carries "relatively extensive" monitoring, while a one-time plan for a one-time fee is "unlikely to have a duty to monitor." Whatever you agreed to, the file should show you did it.

The duty of loyalty

The duty of loyalty is where the highest-profile enforcement has landed. The Interpretation states it directly: "the duty of loyalty requires that an adviser not subordinate its clients' interests to its own," and "to meet its duty of loyalty, an adviser must make full and fair disclosure to its clients of all material facts relating to the advisory relationship."

The operative standard for conflicts is that an adviser must eliminate or make full and fair disclosure of all conflicts of interest such that a client can provide informed consent. Two things follow that CCOs sometimes conflate. Disclosure is not the same as elimination, and a conflict you merely name is a conflict you must still manage. Full and fair disclosure has to be specific enough that a client can actually understand and consent to the conflict; a vague "we may have conflicts" line does not do the work.

The disclosure vehicle is Form ADV Part 2A, and consistency between your actual conflicts and what the brochure says is a recurring exam theme. Marketing and advertising raise the same loyalty-and-disclosure question in a different setting; our SEC Marketing Rule guide covers how the advertising rule treats conflicts and required disclosures.

Fiduciary duty vs. Regulation Best Interest

A frequent point of confusion is how the adviser's fiduciary duty relates to the standard that applies to broker-dealers. They are different standards under different laws for different relationships.

The SEC adopted Reg BI and the adviser Interpretation together in 2019, precisely to draw the line between the two regimes. Reg BI imposes its own care, disclosure, conflict, and compliance obligations on brokers; the difference is not that one side owes nothing, but that the adviser's duty runs through the whole relationship. A dually registered person owes the adviser fiduciary duty when acting in an advisory capacity and the Reg BI standard when making brokerage recommendations, and part of the duty of loyalty is disclosing which hat they are wearing. A separate fiduciary regime, the Department of Labor's rules for retirement advice, can also attach when advice touches ERISA plans or IRAs; that lane is covered in our PTE 2020-02 compliance guide.

How the duty shows up in your compliance program

The duty is abstract; your program is where it becomes concrete and provable. Rule 206(4)-7 requires written policies and procedures reasonably designed to prevent violations of the Advisers Act, plus an annual review of their adequacy. That rule is the container the fiduciary duty lives in. Here is how each element of the duty translates into a control and a record.

The through-line is that the duty is satisfied by activity, and activity leaves records. A conflicts inventory that is never reconciled to the ADV, a best-execution policy with no review behind it, or a monitoring commitment with no logs are the gaps examiners find. RegFin's recurring forms and tasks exist to schedule these reviews and capture that they happened, so the conflicts reconciliation, the best-execution review, and the annual 206(4)-7 review each produce a dated, attributable record.

What a breach looks like

The canonical fiduciary-duty failure is an undisclosed conflict, and the clearest large-scale pattern is mutual fund share-class selection. When an adviser put clients in a share class that paid the adviser or its affiliates a 12b-1 fee while a lower-cost class of the same fund was available, and did not adequately disclose that conflict, the SEC treated it as a breach of the duty to disclose conflicts under Section 206.

The scale is instructive. In its Share Class Selection Disclosure Initiative, announced in February 2018, the SEC offered advisers a chance to self-report the conflict and return money to clients. On March 11, 2019, the Commission announced settlements with 79 investment advisers that returned more than $125 million to clients. The violation in each case was not that a 12b-1 share class is forbidden; it is that the conflict of interest in choosing it was not fully and fairly disclosed. That is the duty of loyalty failing in exactly the way the Interpretation describes.

Evidence over assertion

Asserting that your firm takes its fiduciary duty seriously counts for little at exam. The records are what carry it. A firm that can produce a current conflicts inventory tied to its ADV, dated best-execution reviews, monitoring logs matching each client's agreed scope, and a completed annual review has demonstrated the duty. A firm relying on the policy binder alone is left explaining why the file is empty.

RegFin is built to close that gap. Recurring forms and tasks schedule the conflicts reconciliation, best-execution review, and annual 206(4)-7 review and capture attestations that they were completed, and the reporting layer turns those completions into the exam-ready record an examiner asks for. The work you are already obligated to do ends up leaving proof behind, without a second layer of paperwork on top of it.

For the wider program these controls sit inside, start with our RIA compliance pillar guide or the detailed RIA compliance requirements breakdown.

See how your fiduciary controls produce exam-ready evidence. Book a demo and we will walk through mapping the duty of care and loyalty to your firm's recurring reviews and records.

This article is educational and not legal advice. Verify every citation against the primary source before relying on it; the SEC amends its rules and interpretations periodically.