A fiduciary is legally required to put your interests ahead of their own. That sounds like the bare minimum. It isn't. Most financial professionals aren't held to that standard, and most people have no idea which kind of advisor they're sitting across from.
In my 20-plus years doing this, the most useful question you can ask an advisor is the one almost nobody asks. Are you a fiduciary, all the time, in writing?
What is a fiduciary?
A fiduciary has a legal duty to act in your best interest. Not a suitable interest. Your best one.
That means your goals come before their compensation. It means disclosing conflicts. It means recommending the right thing even when something else pays them more.
Registered investment advisors are held to this standard. It's the highest one in the industry, and it's the one you want on your side of the table.
What is the difference between a fiduciary and the suitability standard?
This is the gap that costs people money, and you'd never spot it on your own.
Plenty of financial professionals, especially those working primarily as brokers, are held to a lower bar called suitability. Under suitability, a recommendation only has to be appropriate for someone in your general situation. It doesn't have to be the best option. It doesn't have to be the cheapest.
Here's what that looks like in practice. Two funds are both suitable for you. One pays your advisor a commission and carries higher fees. The other is a low-cost index fund that pays them nothing. Under suitability, recommending the expensive one is fine. Under a fiduciary duty, it isn't.
Over twenty or thirty years, that gap costs real money. Not a rounding error. Tens or hundreds of thousands of dollars.
How do I know if my financial advisor is a fiduciary?
You ask, and you get it in writing.
Ask it plainly. "Are you a fiduciary, and are you acting as one in every recommendation you make to me?" Listen for a clean yes. If you get qualifying language instead, that tells you something.
Ask how they're paid. Fees you can see, or commissions and product compensation you can't.
Look them up. FINRA's BrokerCheck and the SEC's Investment Adviser Public Disclosure site will show you registrations and any disclosures.
Then ask them to put the fiduciary commitment in writing. A real one won't hesitate.
One honest wrinkle. Some professionals wear two hats. The same person can act as a fiduciary in one part of your relationship and as a broker under suitability in another, depending on how the account is set up. That's legal and it's common. It also means the sharper question isn't "are you ever a fiduciary." It's "are you acting as my fiduciary right now, on this recommendation." An advisor worth trusting will tell you which hat they're wearing without being asked twice.
What about robo-advisors and doing it yourself?
Fair question, and the answer surprises people.
Most robo-advisors are registered investment advisors, which means they do carry a fiduciary duty. But look at what that duty actually covers. It covers the portfolio they built from your ten-question intake form. It does not cover your RSU vesting schedule. It does not cover your AMT exposure, whether to exercise before a tender offer, or the fact that sixty percent of your net worth sits in one stock. A fiduciary duty scoped to a questionnaire is still scoped to a questionnaire.
Self-directed accounts are a different animal. When you're trading on your own through Fidelity, E*Trade, or Robinhood, nobody is advising you, so nobody owes you a duty of any kind. That isn't a knock on those platforms. They do exactly what they say they do. It just means the entire burden of getting it right sits with you.
They're all different versions of the wild west. The only question is how wild you want to get.
Why does it actually matter for my money?
Because the standard shapes every recommendation you get.
A fiduciary is structurally pointed at your interests. Someone under suitability is allowed to point somewhere else when it pays better. You won't see the difference in any one meeting. You feel it over years, in fees you paid, products you were placed in, and conflicts nobody mentioned.
If you have equity compensation, a concentrated position, or a complicated tax picture, the stakes go up. Bigger decisions, bigger conflicts. That's where this standard earns its keep.
A real example
Meredith came in for a second opinion. Director at a biotech company, mid-forties, around $1.4 million invested, and a feeling she couldn't put words to.
Her advisor was pleasant. Responsive. Returned calls. She liked him.
Then we opened her statements together. Nearly everything she owned sat in actively managed funds with front-end sales charges and expense ratios north of 1.1 percent. Comparable index funds were available for a fraction of that. On $1.4 million, the difference ran about $14,000 a year. Every year. That's before counting the sales charges she'd already paid on the way in.
Nothing illegal happened here. Every one of those funds was suitable. That's the whole point.
She'd never asked whether he was a fiduciary. He wasn't, at least not in those accounts, and he never brought it up. She wasn't the victim of anything dramatic. She was working with someone held to a lower standard, and it cost her for years without her knowing.
The version I see more often
Nate is 39, engineering lead at a public tech company. Married, two kids, about $900,000 across his accounts. Roughly $600,000 of that sits in his employer's stock, from years of RSUs vesting that he never touched.
He had an advisor. Nice guy. The portfolio was fine. Low-cost funds, sensible allocation, nothing to complain about on paper.
In four years, that advisor never brought up the concentration. Never asked about his vesting schedule. Never mentioned that one bad quarter at his company would hit his paycheck and his portfolio on the same day. When Nate finally raised it himself, the answer was that the RSUs were held away, outside the accounts being managed.
Technically true. Also exactly the problem.
Nobody sold Nate anything bad. He was under-served on the single most consequential thing in his financial life, and nobody was obligated to raise it.
That's the version I see most around here. Not a bad product. A blind spot nobody had a duty to look into.
If either of these sounds familiar, you already know why the question matters.
Frequently Asked Questions
Are all financial advisors fiduciaries?
No. This is the most common and most expensive misconception out there. Investment Advisor Representatives are held to the fiduciary standard when acting in an advisory capacity. Plenty of other financial professionals operate as brokers under suitability, and some move between the two. The title on the business card won't tell you which. You have to ask.
Are robo-advisors fiduciaries?
Most of them are, technically. They're registered investment advisors, so the duty applies. The catch is scope. That duty covers the portfolio built from your intake questionnaire and not much else. If your situation includes equity compensation, concentrated stock, or a real tax question, a fiduciary duty that narrow doesn't do much for you.
Is a CFP® a fiduciary?
CERTIFIED FINANCIAL PLANNER™️ professionals are required to act as fiduciaries when giving financial advice under CFP Board standards. That's a real commitment. Still worth confirming it applies across your whole relationship, and still worth getting in writing.
Can an advisor be a fiduciary sometimes and not others?
Yes. The same person can act as a fiduciary in one part of a relationship and as a broker under suitability in another, depending on how the account and engagement are structured. That's why the better question is whether they're acting as your fiduciary on the specific advice in front of you.
How do I check if my advisor is a fiduciary?
Ask directly and get it in writing. Look at how they're compensated. Then check their record on FINRA's BrokerCheck and the SEC's Investment Adviser Public Disclosure database. A straightforward advisor makes all of this easy.
Is working with a fiduciary worth it?
Usually yes, especially if your situation has any real complexity. The value isn't only dodging conflicted products and fees you can't see. It's knowing every recommendation is pointed the same direction you are. Everything else in the relationship is built on that.
The bottom line
Fiduciary isn't jargon. It's the difference between advice built around your interests and advice that's merely allowed to be sold to you.
You can't tell which one you're getting from how friendly your advisor is or how nice the office looks. You find out by asking a direct question and paying attention to the answer.
If you've never asked yours, ask. And if the answer isn't a clean, confident yes, that's worth a second opinion.