Regulation Best Interest (Reg BI)

What Is Regulation Best Interest?

Regulation Best Interest, or Reg BI, is an SEC rule requiring broker-dealers and associated persons to act in a retail customer's best interest when making a recommendation about a securities transaction or investment strategy involving securities.

Reg BI raised the conduct standard for broker-dealer recommendations beyond the older suitability framework, but it is not identical to the fiduciary standard that applies to investment advisers under the Investment Advisers Act. Investors should understand which type of professional they are dealing with and what standard applies.

How Reg BI Works

Reg BI has four core obligations. The disclosure obligation requires firms to provide material facts about the relationship and conflicts. The care obligation requires reasonable diligence, care, and skill when making recommendations. The conflict-of-interest obligation requires firms to address conflicts that create incentives to put the firm's interests ahead of the customer's. The compliance obligation requires policies and procedures reasonably designed to achieve compliance.

The rule applies at the time of a recommendation. It does not automatically create an ongoing monitoring duty for every broker-dealer relationship unless the broker has agreed to provide that service.

Reg BI Compared With Related Standards

Financial Consequences for Investors

Reg BI matters because recommendations can shape portfolio cost, risk, liquidity, tax outcomes, concentration, and account type. A broker recommending a rollover, complex product, margin strategy, annuity-like security, share class, or account type must consider the retail customer's investment profile and the available alternatives.

Conflicts remain possible. A firm may receive compensation, revenue sharing, markups, commissions, or other incentives. Reg BI requires conflicts to be disclosed and addressed, but investors still need to ask how the professional is paid and why a recommendation is better than reasonably available alternatives.

What Investors Should Ask

Useful questions include: Are you acting as a broker, adviser, or both? Are you making a recommendation or providing education? How are you compensated? What conflicts apply? What lower-cost or less risky alternatives were considered? Will you monitor this account after the recommendation?

Those questions are practical because titles can be confusing. Financial professionals may use similar business cards while operating under different legal standards.

Limits of the Rule

Reg BI is an important investor-protection rule, but it does not eliminate poor recommendations, conflicts, or investor misunderstanding. It also does not replace due diligence. Investors still need to read disclosures, understand product risks, and document advice received.

Regulators can enforce Reg BI, and firms must supervise compliance, but the rule works best when investors know what relationship they are entering and what obligations come with it.

Documentation is useful. Investors should keep copies of Form CRS, recommendation materials, cost disclosures, risk explanations, and account-opening documents. Those records make it easier to understand what was recommended and why.

The Bottom Line

Regulation Best Interest requires broker-dealers to put retail customers' interests ahead of their own when making securities recommendations. It strengthens broker-dealer conduct standards, but investors still need to understand compensation, conflicts, account type, and whether the professional is acting as a broker or adviser.