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Definition / Meaning of Regulation Best Interest (Reg BI)

The Regulation Best Interest (Reg BI) is a rule established by the U.S. Securities and Exchange Commission (SEC) that sets a higher standard of conduct for broker-dealers and their associated persons when they recommend any securities transaction or investment strategy involving securities to a retail customer. It went into full effect on June 30, 2020. The core purpose of Reg BI is to enhance the quality of the investment advice that retail investors receive by requiring brokers to act in the best interest of their clients, rather than just recommending products that are ‘suitable’ for them.

Before Reg BI, brokers were primarily held to a ‘suitability’ standard. This meant they only had to have a reasonable basis to believe that a recommended transaction or investment strategy was suitable for the customer, based on the customer’s financial situation, needs, and other security holdings. However, this standard did not require the broker to put the customer’s interests ahead of their own. Reg BI elevates this standard by imposing four key obligations on brokers: the Disclosure Obligation, the Care Obligation, the Conflict of Interest Obligation, and the Compliance Obligation.

The Four Key Obligations of Reg BI

To fully understand Reg BI, it is helpful to break down its four main components:

  • Disclosure Obligation: Before or at the time of a recommendation, a broker must provide full and fair disclosure of all material facts about the relationship, including the capacity in which they are acting (broker or fiduciary), any fees or charges, and the type and scope of services provided. This includes disclosing any conflicts of interest that might influence their recommendations.
  • Care Obligation: This is the heart of the rule. The broker must exercise reasonable diligence, care, and skill in making a recommendation. They must have a reasonable basis to believe that the recommendation is in the best interest of the retail customer. This means considering the customer’s investment profile, including their age, investment experience, risk tolerance, financial situation, and investment objectives. The recommendation must not place the financial or other interest of the broker ahead of the customer’s interest.
  • Conflict of Interest Obligation: Brokers must establish, maintain, and enforce written policies and procedures reasonably designed to identify and at a minimum disclose, or eliminate, all conflicts of interest associated with their recommendations. This includes conflicts related to compensation, such as sales contests, quotas, or bonuses that could incentivize a broker to recommend one product over another.
  • Compliance Obligation: The broker-dealer must establish, maintain, and enforce written policies and procedures reasonably designed to achieve compliance with Reg BI. This ensures that the firm as a whole is monitoring and enforcing the rule’s requirements.

How Reg BI Differs from the Fiduciary Standard

While Reg BI is a significant step forward for investor protection, it is important to note that it is not the same as the fiduciary standard that applies to registered investment advisers (RIAs) under the Investment Advisers Act of 1940. A fiduciary duty is the highest legal standard of care, requiring an adviser to always act in the client’s best interest and to put the client’s interests ahead of their own at all times. Reg BI, while requiring a ‘best interest’ standard, is a ‘standard of conduct’ for broker-dealers that is enforced by the SEC. It is a principles-based rule that allows for some conflicts of interest as long as they are properly disclosed and mitigated. In contrast, a fiduciary duty generally requires the elimination of all material conflicts of interest. This distinction is crucial for investors to understand when choosing between a broker-dealer and an RIA.

Practical Implications for Investors

For the average retail investor, Reg BI means that when they receive a recommendation from a broker, they can expect a higher level of care and transparency. For example, if a broker recommends a mutual fund with a high expense ratio and a 12b-1 fee, they must now have a reasonable basis to believe that this recommendation is in the customer’s best interest, not just that it is suitable. They must also disclose the costs and any conflicts of interest, such as receiving a higher commission for selling that particular fund. This helps investors make more informed decisions and reduces the risk of being sold unsuitable or overly expensive products. However, investors should still ask questions about fees, conflicts, and the basis for any recommendation to ensure they are fully informed.

Also Known As Reg BI
Topics Financial Regulation
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Last Updated May 2026

Related Terms

R Regulation D P PCAOB F Financial Industry Regulatory Authority (FINRA) F Fiduciary duty

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