Fiduciary.

A fiduciary is a person or institution legally and ethically obligated to act in the best interest of another party — the beneficiary — when managing assets, providing advice, or making decisions on their behalf. The fiduciary standard is the highest duty of care recognized in financial services law, requiring not merely that advice be "suitable" but that it genuinely prioritize the client's welfare above the adviser's own financial interests or those of their employer. Registered investment advisers (RIAs) in the United States are held to a fiduciary standard under the Investment Advisers Act of 1940, while broker-dealers have historically been held to the lower "suitability standard" — a distinction that has shaped how financial advice has been sold and regulated for decades. The Department of Labor's fiduciary rule, various state-level regulations, and the SEC's Regulation Best Interest have progressively tightened standards for advisers working with retirement accounts and retail investors, though the regulatory landscape remains complex and debated. For individual investors seeking financial guidance, the practical consequence of working with a fiduciary versus a non-fiduciary adviser is significant. A fiduciary who recommends a higher-cost actively managed fund when an equivalent low-cost index fund is available has violated their duty; a broker operating under the suitability standard may not have — provided the recommendation was not wholly inappropriate. Fee-only financial planners — those compensated solely by client fees rather than commissions — are often cited as the clearest example of fiduciary advisers because their compensation structure removes the conflicts of interest inherent in commission-based selling.