

Regulation Best Interest (Reg BI): Definition, Obligations & Standard Comparison
Regulation Best Interest — universally abbreviated Reg BI and codified at 17 CFR 240.15l-1 under the Securities Exchange Act of 1934 — is the SEC rule adopted on June 5, 2019 and effective June 30, 2020 that establishes the standard of conduct governing broker-dealers and their associated persons when making recommendations of any securities transaction, investment strategy involving securities, or account type to a retail customer, requiring that the broker-dealer act in the best interest of the retail customer at the time the recommendation is made without placing the financial or other interest of the broker-dealer or associated person ahead of the interest of the retail customer.
Regulation Best Interest represents the most significant reform of the broker-dealer conduct standard since the suitability framework was codified in FINRA Rule 2111, elevating the standard applicable to retail customer recommendations above the prior suitability requirement — under which a broker needed only to have a reasonable basis to believe a recommendation was suitable for the customer — to a best interest standard that explicitly prohibits the broker from placing its own financial interest above the customer's when making recommendations.
Reg BI is the SEC's response to the mandate of Section 913 of the Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010, directing the SEC to study the standards of conduct applicable to broker-dealers and investment advisers and to adopt rules if necessary and appropriate — and its adoption completed a decade-long regulatory debate about whether broker-dealers who provide personalised investment advice to retail customers should be subject to a full fiduciary duty equivalent to that applicable to investment advisers under the Investment Advisers Act of 1940.
Regulation Best Interest is directly and extensively tested on the Series 7 and Series 65 examinations in the context of broker-dealer conduct standards, the four component obligations, the retail customer definition, the comparison with suitability under FINRA Rule 2111, and the distinction from the investment adviser fiduciary duty.
The General Obligation — The Foundational Standard
The general obligation of Regulation Best Interest — stated in 17 CFR 240.15l-1(a)(1) — requires that a broker-dealer or associated person, when making a recommendation of any securities transaction or investment strategy involving securities to a retail customer, shall act in the best interest of the retail customer at the time the recommendation is made, without placing the financial or other interest of the broker-dealer or associated person ahead of the interest of the retail customer.
This general obligation contains two distinct and equally important components.
The affirmative component — act in the best interest of the retail customer — requires that the broker-dealer's recommendation be oriented toward achieving the best outcome for the customer given their investment profile and circumstances.
The negative component — without placing the financial or other interest of the broker-dealer ahead of the interest of the retail customer — specifically prohibits the recommending broker from prioritising its own compensation, product quotas, or other financial interests when selecting among reasonably available alternatives.
The SEC deliberately chose not to define the term best interest in the rule text, following the same approach used in the Investment Advisers Act's treatment of the investment adviser fiduciary duty — instead providing through the four component obligations a framework of specific behaviours that together constitute compliance with the best interest standard.
A broker-dealer that satisfies all four component obligations simultaneously satisfies the general best interest obligation.
The Retail Customer Definition — Who Reg BI Protects
Regulation Best Interest applies only to recommendations made to retail customers — a defined term under 17 CFR 240.15l-1(b)(1) that limits the rule's scope to natural persons — individuals — or the legal representatives of such individuals who receive a recommendation primarily for personal, family, or household purposes.
The retail customer definition specifically excludes institutional investors, sophisticated counterparties, and entities — corporations, partnerships, trusts used for non-personal purposes, and other non-natural person entities do not qualify as retail customers for Reg BI purposes regardless of their size or sophistication.
This limitation reflects the SEC's judgment that natural persons making personal investment decisions require the heightened conduct standard that Reg BI provides, while institutional market participants have sufficient sophistication, resources, and bargaining power to negotiate appropriate standards of conduct through their commercial relationships with broker-dealers.
The primarily personal, family, or household purposes qualifier further limits the retail customer definition — a natural person who uses a brokerage account exclusively for business investment purposes rather than personal investing may not be a retail customer even though they are an individual.
In practice the vast majority of individual investors maintaining retail brokerage accounts at broker-dealers are retail customers whose recommendations are subject to Reg BI.
The Four Component Obligations — The Implementation Framework
Regulation Best Interest establishes a general best interest obligation that is satisfied through compliance with four specific component obligations — each addressing a different dimension of the broker-dealer's relationship with retail customers and its management of conflicts of interest.
These four obligations are the most directly and extensively tested aspect of Reg BI in the securities licensing examination curriculum.
The Disclosure Obligation
The disclosure obligation — codified at 17 CFR 240.15l-1(a)(2)(i) — requires the broker-dealer, prior to or at the time of the recommendation, to provide the retail customer in writing with full and fair disclosure of all material facts relating to the scope and terms of the relationship with the retail customer and all material facts relating to conflicts of interest associated with the recommendation.
The disclosure must include that the broker-dealer is acting as a broker-dealer — not as an investment adviser — with respect to the recommendation, the material fees and costs that apply to the customer's transactions, holdings, and accounts, the type and scope of services provided including any material limitations on the securities or investment strategies that may be recommended, and all material facts relating to conflicts of interest associated with the specific recommendation being made.
The most significant practical implementation of the disclosure obligation is the Form CRS — the Customer Relationship Summary — which broker-dealers and investment advisers must deliver to retail customers before or at the time of entering a new relationship.
Form CRS provides a standardised disclosure document in plain language describing the types of services offered, the fees and costs, any material limitations on services, legal standards of conduct, and conflicts of interest — enabling retail customers to compare broker-dealer and investment adviser relationships and understand the applicable conduct standard before making a choice.
The Care Obligation
The care obligation — codified at 17 CFR 240.15l-1(a)(2)(ii) — requires the broker-dealer to exercise reasonable diligence, care, and skill in making the recommendation — specifically by understanding the potential risks, rewards, and costs associated with the recommendation and having a reasonable basis to believe that the recommendation is in the best interest of at least some retail customers — the reasonable basis determination — and is in the best interest of the specific retail customer based on that customer's investment profile — the customer-specific determination — and does not place the financial or other interest of the broker-dealer ahead of the interest of the retail customer.
The care obligation is the component most directly related to the prior FINRA Rule 2111 suitability framework — it requires the broker-dealer to understand what it is recommending and to match the recommendation to the customer's specific circumstances.
However the care obligation goes beyond the suitability framework in one critically important respect — it requires the broker-dealer to consider the costs and reasonably available alternatives before making a recommendation.
Under the prior suitability standard a broker who recommended a higher-cost product when an equally suitable lower-cost alternative was available did not necessarily violate the suitability rule — both products were suitable.
Under the care obligation the broker must consider whether the higher-cost product is in the customer's best interest when a lower-cost alternative providing equivalent or superior outcomes is available — the cost differential must be justified by a specific benefit to the customer.
The Conflict of Interest Obligation
The conflict of interest obligation — codified at 17 CFR 240.15l-1(a)(2)(iii) — requires the broker-dealer entity — not the individual associated person — to establish, maintain, and enforce written policies and procedures reasonably designed to identify and fully and fairly disclose all material conflicts of interest associated with the firm's recommendations, identify and mitigate any conflicts of interest that create an incentive to place the firm's interest ahead of the customer's interest, identify and disclose or eliminate any material limitations on the securities or strategies the firm recommends, and identify and eliminate sales contests, sales quotas, bonuses, and non-cash compensation tied to the sale of specific securities or types of securities within a limited time period.
The specific prohibition on sales contests tied to specific securities is one of the most practically significant provisions of the conflict of interest obligation — it directly prohibits the types of incentive programmes that historically created the most severe conflicts between broker financial interests and customer best interests.
A broker-dealer may not incentivise its registered representatives to sell a specific security or product during a specific contest period through prizes, travel, or other non-cash awards because such incentives create powerful financial pressure to recommend the contest security regardless of whether it is the best available alternative for each specific customer.
The Compliance Obligation
The compliance obligation — codified at 17 CFR 240.15l-1(a)(2)(iv) — requires the broker-dealer entity to establish, maintain, and enforce written policies and procedures reasonably designed to achieve compliance with all of Regulation Best Interest.
The compliance obligation is the supervisory infrastructure component of Reg BI — requiring the firm to have systems, controls, and procedures that make compliance with the other three obligations operationally achievable and verifiable.
The compliance obligation is distinct from the conflict of interest obligation in its scope — while the conflict of interest obligation addresses the specific problem of managing conflicts through policies and procedures, the compliance obligation addresses the broader need for a firm-wide supervisory framework that detects, prevents, and remediates violations of any Reg BI component.
A firm that has excellent disclosure and care practices at the individual representative level but lacks adequate supervisory review to detect violations has likely failed the compliance obligation even if most individual recommendations comply with the other obligations.
Regulation Best Interest Versus FINRA Rule 2111 Suitability — The Critical Comparison
The comparison between Regulation Best Interest and the FINRA Rule 2111 suitability standard is the most directly and consistently tested regulatory conduct standard comparison on the Series 65 examination — requiring candidates to articulate precisely how the two standards differ and why the SEC considered Reg BI an upgrade from the prior suitability framework.
Under FINRA Rule 2111 suitability the broker-dealer must have a reasonable basis to believe that a recommended transaction or investment strategy is suitable for the customer based on the customer's investment profile — including age, financial situation, investment objectives, risk tolerance, time horizon, and other relevant factors.
The suitability standard does not require that the recommendation be the best available option — only that it be suitable for the customer.
If two products are equally suitable for a customer, the broker-dealer may recommend whichever produces the higher commission without violating suitability — the financial interest of the broker is not constrained by the suitability framework as long as the recommendation itself is suitable.
Under Regulation Best Interest the broker-dealer must act in the customer's best interest without placing its own financial interest ahead of the customer's.
This language specifically addresses the gap that suitability left open — a broker recommending a higher-cost fund when an equally or more suitable lower-cost fund is available must justify that recommendation in terms of the customer's best interest. The fact that both funds are suitable is not sufficient — the broker must affirmatively consider whether the higher-cost choice serves the customer better or whether the cost difference is simply increasing the broker's compensation at the customer's expense.
FINRA Rule 2111 does not apply to recommendations subject to Regulation Best Interest — the two standards are mutually exclusive for retail customer recommendations by broker-dealers effective June 30, 2020. All three suitability obligations of Rule 2111 — reasonable-basis, customer-specific and quantitative — continue to apply to the recommendations Regulation Best Interest does not cover, such as those to non-retail customers, and none of them applies alongside Regulation Best Interest to a recommendation it covers.
Regulation Best Interest Versus the Investment Adviser Fiduciary Duty
The SEC explicitly stated in the adopting release for Reg BI that the best interest standard is not identical to the fiduciary duty applicable to investment advisers under the Investment Advisers Act of 1940 — a distinction that remains one of the most actively debated questions in securities regulation.
The investment adviser fiduciary duty under Advisers Act Sections 206(1) and 206(2) — interpreted in the SEC's 2019 fiduciary interpretation Release IA-5248 — is a continuous duty that applies throughout the entire advisory relationship, requiring the adviser to act in the client's best interest in all aspects of the relationship including making recommendations, managing portfolios, selecting service providers, and managing conflicts.
The fiduciary duty applies to every aspect of the advisory relationship — not only to specific recommendation events.
Regulation Best Interest applies at the moment of a recommendation — it is a transaction-specific standard rather than a relationship-wide ongoing duty.
The broker-dealer's Reg BI obligations are triggered by a specific recommendation and are discharged at the time of that recommendation — there is no ongoing Reg BI monitoring obligation between recommendations of the type that the investment adviser's continuous fiduciary duty requires.
This distinction is important for the Series 65 examination because investment advisers must satisfy their fiduciary duty continuously throughout the client relationship — including when they are not making specific recommendations — while broker-dealers must satisfy Reg BI at the time of each specific recommendation.
The broker-dealer's obligations between recommendations — absent a specific recommendation — are not governed by Reg BI but rather by the general conduct standards applicable to all broker-dealers.
How Regulation Best Interest Divides Responsibility Between the Firm and the Representative
The four component obligations are not all addressed to the same person, and reading them in the rule text makes the division plain. The disclosure obligation and the care obligation are each stated as requirements of the broker, dealer, or natural person who is an associated person of a broker or dealer — so an individual registered representative owes them personally when making a recommendation. The conflict of interest obligation and the compliance obligation are stated differently: each is a requirement that the broker or dealer establish, maintain and enforce written policies and procedures, and an associated person acting alone cannot satisfy either of them, because what the rule requires there is an institutional system rather than a judgement made at the point of recommendation.
The policies and procedures the compliance obligation requires must be reasonably designed to achieve compliance with Regulation Best Interest — with the whole of it, not only with the parts the firm performs itself. Because the disclosure obligation and the care obligation are addressed to associated persons as well as to the firm, a firm's compliance policies have to reach the conduct of its representatives at the moment each recommendation is made. A firm whose policies manage its own conflicts thoroughly but say nothing about how representatives form the care obligation's determinations has not built what this obligation asks for.
The rule asks for three things of those written policies and procedures, not one: they must be established, maintained and enforced. Each verb carries work. A firm that adopts a policy and files it has established it; a firm that revises it as its business and its conflicts change has maintained it; a firm that acts on breaches when its own reviews find them has enforced it. A policy that is written correctly and then left unapplied — representatives departing from it without consequence, exceptions granted and never recorded — fails the conflict of interest obligation and the compliance obligation alike, whatever its drafting quality, because enforcement is a stated element of what each obligation requires rather than a matter of good practice beyond it.
Applying the Disclosure Obligation in Practice
The fees and costs the disclosure obligation reaches are the material fees and costs that apply to the retail customer's transactions, holdings and accounts — three levels, not one, and a firm that discloses only the charge on the recommended trade has disclosed at one of them. Suppose a customer is recommended a sixty thousand dollar purchase of a fund, and suppose the firm charges a commission of one and a half percent, the fund carries an annual expense of eight tenths of one percent, and the account carries an annual fee of one hundred and twenty-five dollars. The transaction-level charge is nine hundred dollars, the holding-level charge for the first year is four hundred and eighty dollars, and the account-level charge is one hundred and twenty-five dollars, so the first-year total is one thousand five hundred and five dollars and the commission the customer most readily sees is just under three fifths of it. All three figures fall within the fees and costs the rule directs the firm to disclose.
The Customer Relationship Summary and the disclosure obligation do different work, and delivering the former does not complete the latter. The relationship summary is given to a retail customer before or at the time of entering a new relationship and describes, in standardised terms, the services the firm offers, its fees, its legal standard of conduct and the kinds of conflict its business creates. The disclosure obligation separately requires full and fair disclosure of all material facts relating to the conflicts of interest associated with the recommendation — a particular recommendation, made at a particular moment, with whatever conflicts attach to that one. A firm that delivered a relationship summary at account opening and then recommends a product on which it earns a payment from the product's sponsor has not disclosed that conflict merely because its summary said conflicts of this kind can arise.
The obligation is also built from two separate categories of material fact, and only one of them is about conflicts. The first category is the scope and terms of the relationship with the retail customer: the capacity in which the firm and its representative are acting, the material fees and costs, and the type and scope of services provided including any material limitations on what may be recommended. The second category is the material facts relating to conflicts of interest associated with the recommendation. Because the rule states them as separate categories, the relationship facts are owed in respect of a recommendation that presents no conflict at all — a firm cannot reason that a recommendation carrying no conflict of interest therefore carries no disclosure duty.
What Counts as a Conflict of Interest Under the Rule
Regulation Best Interest defines the term it turns on. A conflict of interest, for the purposes of the rule, means an interest that might incline a broker, a dealer, or a natural person who is an associated person of a broker or dealer — consciously or unconsciously — to make a recommendation that is not disinterested. Three features of that definition do the work. It is keyed to an interest rather than to an act; it asks what the interest might do to a recommendation rather than what it has already done; and it describes the mechanism of influence as capable of operating below the level of the person's own awareness.
Because the definition names unconscious influence alongside conscious influence, establishing that an interest is a conflict requires no finding about the state of mind of the person who holds it. A representative who is entirely unaware that one product pays the firm more than another, and who would have made the same recommendation had the payments been identical, still holds an interest that might incline a recommendation. Good faith is therefore not an answer to the identification requirement: a firm cannot leave an incentive out of its conflicts inventory on the ground that its representatives are honest, because the definition is satisfied by the potential for influence and not by proof that influence occurred.
The definition names the interest of the broker, the interest of the dealer and the interest of the natural person who is an associated person, and those are not the same interest. An interest personal to the representative — a production target that affects their own compensation, a personal relationship with the sponsor of a product, an interest in a business that would benefit from the recommendation — falls within the definition even where the firm itself gains nothing from the recommendation at all. A conflicts inventory built only from the firm's revenue arrangements will therefore miss a category of conflict the rule expressly covers.
Disclosing, Mitigating and Eliminating a Conflict
The conflict of interest obligation does not treat every conflict the same way, and the difference between its requirements is where most of its practical content sits. For conflicts of interest associated with the firm's recommendations generally, the rule requires written policies and procedures reasonably designed to identify them and, at a minimum, to disclose them in the manner the disclosure obligation specifies — or else to eliminate them. Disclosure is the floor for that general category, and elimination is the alternative the firm may choose instead.
A narrower category attracts a different verb. Where a conflict creates an incentive for a natural person who is an associated person to place the interest of the firm or of that person ahead of the retail customer's interest, the rule requires the firm's policies to identify and mitigate it. Mitigation is a requirement about the incentive itself, so it is not met by recording the incentive and telling the customer about it: a firm that discloses an incentive accurately, completely and in advance, and leaves the incentive exactly as it was, has done what the general category asks and not what this one asks. Reading the two requirements together gives the firm a graded task — identify every conflict associated with its recommendations, disclose or eliminate each of them, and then do something about those among them that pull on the individual making the recommendation.
Material limitations on what a firm will recommend are handled by a two-part requirement of their own. The firm's policies must identify and disclose any material limitation placed on the securities or investment strategies involving securities that may be recommended to a retail customer, together with the conflicts of interest associated with that limitation; and they must also prevent the limitation and those conflicts from causing recommendations that place the firm's or the representative's interest ahead of the customer's. A firm whose menu holds only its own affiliate's funds, and which says so plainly in writing, has satisfied the first part and not the second — the disclosure tells the customer what the constraint is, while the second part asks the firm to stop that constraint from producing recommendations that serve the firm.
The Care Obligation Applied to a Series of Recommendations
The care obligation asks for a reasonable basis to believe three things, and the third is about a pattern rather than a recommendation. Beyond the belief that a recommendation could be in the best interest of some retail customers, and the belief that it is in the best interest of this particular retail customer, the rule requires a reasonable basis to believe that a series of recommended transactions — even where each of them is in the retail customer's best interest when viewed in isolation — is not excessive, is in the customer's best interest taken together in light of that customer's investment profile, and does not place the financial or other interest of the firm or the representative ahead of the customer's. A set of recommendations each of which can be justified on its own can therefore fail the care obligation collectively, and the failure is a failure of the care obligation itself rather than of some separate rule about trading volume.
That element is owed in making the recommendation, which places a backward look inside a standard that is otherwise applied at a moment. When a representative recommends the next transaction in an account, the series to be assessed includes the recommendations already made in it, so the question is not only whether this transaction suits the customer but whether this transaction, added to what has already been recommended, leaves the pattern defensible. The obligation attaches at each recommendation and is assessed then; what the rule directs the representative to look at, at that point, extends further back than the recommendation in front of them.
Whether a series is excessive is measured in light of that retail customer's investment profile, and not against any figure the rule supplies. The same number of recommended transactions, in the same security, over the same period, can therefore be excessive in one retail customer's account and unobjectionable in another's, because the profiles against which the two are measured differ. A firm looking for a single threshold that makes a pattern of recommendations acceptable will not find one in this obligation: what it provides is a comparison, and the customer supplies one side of it.
Incentive Compensation and the Limits of the Elimination Requirement
An interest need not be cash to be a conflict of interest. The definition reaches any interest that might incline a recommendation, and the conflict of interest obligation names non-cash compensation expressly among the arrangements it addresses, so prizes, travel, merchandise, recognition programmes and internal product targets are all capable of being conflicts. The practical consequence is that a firm which has levelled every commission in its product range may still hold conflicts to identify: a quota that a representative must meet to retain a desk, or an award trip for which sales of one product qualify, exerts the pressure the definition describes without a dollar changing hands at the point of recommendation.
The requirement to eliminate such arrangements has a stated boundary, and the boundary matters as much as the requirement. What must be eliminated is a sales contest, sales quota, bonus or non-cash compensation that is based on the sales of specific securities or specific types of securities within a limited period of time: both elements — the tie to particular securities or particular types of them, and the limited period — are part of what triggers elimination. An incentive that lacks them, such as a bonus computed at the end of the year on the firm's overall profitability, is not within that elimination requirement, which does not leave it unregulated: it remains a conflict to be identified, disclosed or eliminated, and mitigated if it creates an incentive for a representative to place the firm's interest ahead of a customer's.
Mitigation, where it is required, operates on the incentive, and a worked comparison shows what that means. Suppose a firm pays a representative one percent of the amount invested when a customer buys the firm's own fund and half of one percent when the customer buys a comparable third-party fund. On a two hundred thousand dollar recommendation that is two thousand dollars against one thousand dollars, so one thousand dollars of the representative's pay turns on which of two comparable funds is recommended. Disclosing the differential tells the customer that the thousand dollars is there. Levelling the payout — paying three quarters of one percent, or one thousand five hundred dollars, whichever fund is recommended — removes it, and with it the incentive, which is what the mitigation requirement is directed at.
Examination Relevance and Key Takeaways
Regulation Best Interest is tested on the Series 7 and Series 65 examinations in the context of broker-dealer conduct standards, the four component obligations, the retail customer definition, the comparison with FINRA Rule 2111 suitability, and the distinction from the investment adviser fiduciary duty.
The key points to retain are these.
Regulation Best Interest — codified at 17 CFR 240.15l-1 — was adopted by the SEC on June 5, 2019 and became effective June 30, 2020.
It requires broker-dealers and associated persons when making recommendations to retail customers to act in the best interest of the retail customer without placing the broker-dealer's financial or other interest ahead of the customer's interest.
A retail customer is a natural person or their legal representative who receives a recommendation primarily for personal, family, or household purposes — institutional investors and non-natural persons are not retail customers.
FINRA Rule 2111 does not apply to recommendations subject to Regulation Best Interest — the two standards are mutually exclusive for retail customer recommendations.
The four component obligations are the disclosure obligation — full and fair written disclosure of material facts about the relationship and conflicts of interest before or at the time of the recommendation including through Form CRS; the care obligation — exercise reasonable diligence, care, and skill, understand risks, rewards, and costs of the recommendation, have a reasonable basis to believe it is in the best interest of retail customers generally and the specific customer based on their investment profile, and consider costs and reasonably available alternatives; the conflict of interest obligation — applicable to the broker-dealer entity only, requiring written policies to identify, disclose, and mitigate conflicts and to eliminate sales contests tied to specific securities; and the compliance obligation — written policies and procedures reasonably designed to achieve compliance with all of Reg BI firm-wide.
The critical distinction from FINRA Rule 2111 suitability is that suitability requires only that a recommendation be suitable — it does not prohibit recommending a higher-cost suitable alternative over a lower-cost equally suitable one.
Reg BI requires the broker to act in the customer's best interest without placing its own financial interest ahead of the customer's — specifically requiring consideration of costs and reasonably available alternatives.
The critical distinction from the investment adviser fiduciary duty under the Investment Advisers Act of 1940 is that Reg BI is a transaction-specific standard triggered by a recommendation, while the investment adviser fiduciary duty is a continuous relationship-wide obligation applying throughout the entire advisory relationship even between specific recommendations.


