What does “fiduciary” mean?
The legal duty behind the advice you get, in plain English.
By the ChooseAFinancialAdvisor.com editorial team · Reviewed October 2026 · 3 min read
You’ll hear the word “fiduciary” a lot when shopping for an advisor, often in a tone suggesting it settles everything. It’s important, but it helps to know exactly what it means and what it doesn’t.
The short answer
A fiduciary must act in your best interest. Registered investment advisors owe their clients a fiduciary duty when giving investment advice, which includes a duty of care (giving advice that fits your situation) and a duty of loyalty (putting your interests ahead of their own and disclosing conflicts).
How brokers differ
Brokers who recommend investments follow Regulation Best Interest, which since 2020 has required their recommendations to be in your best interest at the time they’re made. The standards overlap, but they aren’t identical: an advisor’s duty generally continues throughout the relationship, while a broker’s applies to each recommendation.
Many professionals are registered as both. That means the standard can depend on which account or product you’re discussing.
Being a fiduciary doesn’t mean having no conflicts. It means disclosing them and managing them in your favor.
What fiduciary doesn’t guarantee
A fiduciary can still make mistakes, charge more than another advisor, or simply not be a good fit. The duty is a floor, not a guarantee of great advice.
A good question to ask
“Are you acting as a fiduciary for every account and recommendation you’d make for me?” A clear yes, or a clear explanation of when they aren’t, is a good sign. Hesitation is worth noticing.
This guide is general education, not financial advice. Your situation is your own, so talk with a qualified professional before making decisions.