Best Interest Standard
The best interest standard is a legal and regulatory duty requiring financial advisors and broker-dealers to act in the best interest of their clients when making investment recommendations, placing the client's financial wellbeing above the advisor's own financial interests or those of the firm, and representing an elevation of the standard above the mere 'suitability' requirement previously applicable to many broker-dealer relationships.
Key takeaways
- In the U.S., Regulation Best Interest (Reg BI), effective June 2020, requires broker-dealers to act in the retail customer's best interest at the time of a recommendation, disclosing and mitigating conflicts of interest.
- The fiduciary standard — which applies to investment advisers registered under the Investment Advisers Act of 1940 — requires ongoing duty to act in client's best interest, not just at the point of recommendation.
- Reg BI requires firms to provide Form CRS (Customer Relationship Summary) to retail customers, describing the nature of services, fees, conflicts of interest, and legal standards of conduct.
- The distinction between 'best interest' (Reg BI, applicable to broker-dealers) and 'fiduciary duty' (Investment Advisers Act, applicable to RIAs) remains a subject of regulatory and legal debate.
- Conflicts of interest — including revenue sharing, proprietary product preferences, and compensation structures — must be disclosed, mitigated, and (for material conflicts) eliminated under best interest frameworks.
Explanation
The evolution toward best interest standards reflects decades of regulatory concern about conflicts of interest embedded in the compensation structures of retail financial advice. Under the traditional 'suitability' standard, a broker was required only to reasonably believe that a recommended product was suitable for the customer based on their financial situation and needs — a standard that permitted recommending a more expensive product (generating higher commissions) over a cheaper, functionally equivalent alternative, provided both were 'suitable.'
The Department of Labor's 2016 Fiduciary Rule attempted to impose a full fiduciary standard on all retirement account advisors, but was vacated by a federal appeals court in 2018 on procedural grounds. The SEC responded with Regulation Best Interest (effective June 2020), which occupies a middle ground: it requires broker-dealers to act in the retail customer's best interest and obliges them to disclose and mitigate conflicts of interest — but does not impose the ongoing fiduciary duty of an investment adviser. Critics argue that Reg BI is insufficiently strong; proponents contend it provides meaningful consumer protection while preserving the commission-based distribution model.
The practical distinctions between the suitability standard (pre-Reg BI), Reg BI, and the investment adviser fiduciary standard are significant. Under suitability, a broker could recommend a mutual fund with a 5.75% front-end load and 1.2% expense ratio when a virtually identical index fund with no load and 0.05% expenses was available — provided both were 'suitable.' Under Reg BI, this recommendation would need to be justified in the client's best interest and the conflict of interest created by the differential compensation would need to be disclosed and mitigated. Under a full fiduciary standard, the lower-cost option would almost certainly be required.
For hedge fund and institutional practitioners, the best interest standard creates compliance obligations primarily around soft dollar arrangements, referral fees, and advisor-as-limited-partner relationships in private funds. Investment advisers to hedge funds owe fiduciary duties to the fund and its investors; any arrangement in which the adviser receives compensation for recommending a service provider or cross-trading between fund accounts must be evaluated against the best interest standard and disclosed in Form ADV.
Example
A retail financial advisor at a broker-dealer is considering recommending either Fund A (a proprietary actively managed fund with a 1.5% expense ratio, generating $750/year in 12b-1 fees to the advisor on a $50,000 investment) or Fund B (a low-cost index fund with a 0.05% expense ratio and no 12b-1 fee). Under the old suitability standard, recommending Fund A was potentially permissible if it met the client's investment objective. Under Reg BI, the advisor must document why Fund A is in the client's best interest despite the higher cost, explicitly disclose the $750 annual financial incentive, and demonstrate that the recommendation is not driven by that incentive. An advisor who cannot provide a genuine performance or service justification for Fund A's higher cost would likely need to recommend Fund B to comply with Reg BI.
Related terms
Audit Trail Basel Iii Broker Dealer Compliance Program End User Exception Expense Ratio Fiduciary Duty Form Adv Hedge Fund Mifid Ii Option