Debates over fiduciary status gained national prominence with the Department of Labor’s 2016 attempt to define an investment adviser fiduciary under the Employee Retirement Income Security Act in 2016. The DOL’s fiduciary rule, however, was vacated by the courts, leaving doubt as to whether and when an investment advisor is considered a fiduciary under ERISA. Moreover, many believe that earlier guidance from the DOL on who is an investment advisor fiduciary is too narrow to protect retirement investors. What is less well known is that many of the debates in ERISA over investment advisor fiduciaries track larger debates in the common law regarding fiduciary status. This chapter explores three parallels between the common law and ERISA in determining fiduciary status. The first is the structure of fiduciary categories and the division between categorical and ad hoc fiduciaries. The second is the tendency to look to whether one person has discretionary authority to determine whether the first person is a fiduciary. The third is the challenge raised by advice giving. Both common law courts and ERISA jurisprudence struggle to determine whether and when advisors, who lack discretionary authority, should be considered fiduciaries. The chapter concludes that trust can serve as a foundation for an advisor’s fiduciary status both in the common law and under ERISA.

The statutory regime that governs employee benefit plans includes fiduciary provisions that track the obligations of loyalty and care developed in trust law. Relationships among key benefit plan actors, however, never have mapped neatly onto the trust law structure of settlors, trustees, and beneficiaries. In particular, the self-interest of the employers that sponsor benefit plans is in tension with their fiduciary obligations. Changes in the relative importance of some types of benefit plans have caused the tensions to become more acute. To address the relationships among benefit plan actors and the tensions between self-interest and fiduciary obligation, courts have developed implementing rules to adapt the fiduciary standards to the employee benefit plan ecosystem. This chapter compares two implementing rules to identify differences in the ways they function and have adapted to the current plan paradigms.