RIA vs Broker-Dealer: 10 Differences That Matter for High-Earning Families

By Kevin Luu, Co-Founder and Chief Learning Officer. Reviewed on 2026-09-30.

A registered investment adviser (RIA) is paid to give advice and owes you a fiduciary duty for the whole relationship. A broker-dealer is paid to buy and sell securities for you, and its representatives must act in your best interest under Regulation Best Interest only at the moment they make a recommendation, with no duty to keep watching the account afterward. The other differences (who regulates them, how they are paid, what they can sell you, and what they will tell you) follow from that one split.

For a two-income household earning $750,000 to $3 million in California or Washington, the label on the business card matters less than which hat the person is wearing on each of your accounts. Many advisers hold both registrations. This guide explains the differences that change real outcomes for a family with RSUs, a 529 for each child and a growing taxable account, and gives a worked example with three ways the same family could be served.

The legal standard: fiduciary duty versus best interest at the point of sale

RIAs are regulated under the Investment Advisers Act of 1940. The SEC describes the adviser’s fiduciary duty as a duty of care and a duty of loyalty that applies to the entire relationship, including advice about which account type to use and ongoing monitoring when the adviser has agreed to provide it (SEC interpretation, Release IA-5248).

Broker-dealers have followed Regulation Best Interest since its compliance date of June 30, 2020. The rule says a broker must act in the best interest of the retail customer “at the time the recommendation is made” (17 CFR 240.15l-1). The SEC’s adopting release states plainly that the rule “imposes no duty to monitor a customer’s account following a recommendation” (SEC Release 34-86031).

That fixes a common error, including in the earlier version of this page: brokers no longer work under the old “suitability” standard for retail recommendations. Reg BI is stricter than suitability. It is still a transaction-by-transaction standard, not an ongoing one.

Ten differences that matter to a high-earning family

Two of these rows deserve more detail for this reader: who regulates the firm, and how the person is paid.

Who regulates an RIA and who regulates a broker-dealer

An adviser generally registers with the SEC once it manages at least $100 million. Under SEC Rule 203A-1, a firm may choose SEC registration between $100 million and $110 million and does not have to withdraw unless it falls below $90 million (17 CFR 275.203A-1). Smaller advisers register with their state. In California that is the Department of Financial Protection and Innovation. In Washington it is the Securities Division of the Department of Financial Institutions.

Broker-dealers register with the SEC and must be members of FINRA, a self-regulatory organization that writes and enforces rules for brokerage firms and licenses their representatives. A person who holds both a brokerage license and an adviser registration is often called dually registered. On one account they are your fiduciary, and on the next they may be acting as a broker.

Broker-dealers and SEC-registered advisers must give retail investors Form CRS, a short relationship summary that SEC rules limit to two pages, or four pages for a firm that is both an adviser and a broker-dealer (SEC Release 34-86032). The SEC rule does not require state-registered advisers to provide it, so with a smaller adviser read the Form ADV brochure instead. Either way, read it before the first meeting. It states how the firm is paid and what conflicts it has, in standard language that is hard to dress up.

How the pay model shapes the advice you get

Every pay model has a conflict. The useful question is which conflict you can see and manage.

• Commissions and sales charges reward activity and product choice. A family that buys a fund once and holds it for 15 years can pay less this way than with an annual fee. The risk is a recommendation that pays the broker more than the alternative, such as an advisor-sold 529 share class with a sales charge when California’s ScholarShare 529 or Washington’s DreamAhead plan could be bought directly.
• A percentage of assets rewards gathering and keeping assets. It can make an adviser slow to tell you to pay down a mortgage, fund a donor-advised fund, or move money into an employer plan they do not manage.
• A flat fee is not tied to your balance or your trades. It is visible in one number, which makes it the easiest of the three to judge against the work actually done.

“Fee-only” means the adviser takes no commissions at all. “Fee-based” usually means a mix of advisory fees and commissions, which requires a broker-dealer affiliation. The two terms sound alike and are not the same. More on how advisory pricing works is in our guide to RIA fees.

Worked example: one Bay Area family, three ways to be served

Assumptions (illustrative, not a quote from any firm): a married couple in Palo Alto with two children aged 4 and 8. Household W-2 income is $1.1 million, including about $350,000 a year of RSUs from one employer. They hold $1.5 million in a taxable brokerage account, about half of it in that employer’s stock, plus two 401(k)s and two 529s.

Option A: commission brokerage account

The broker recommends moving $1.5 million into a fund family with a hypothetical 1% sales charge at that purchase size and a hypothetical 0.25% annual distribution fee. Cost: $15,000 once, then about $3,750 a year. Over 10 years that is roughly $52,500, before any growth. The broker has no duty to tell them in year three that their employer stock has grown back to 60% of the account.

Option B: fee-based advisory account at a broker-dealer

The same representative opens an advisory account at a hypothetical 1.0% a year: $15,000 a year, or about $150,000 over 10 years. On this account they are a fiduciary. Their 529 recommendations and any insurance sold alongside may still be made in their broker capacity.

Option C: fee-only RIA on a flat fee

A hypothetical flat fee of $20,000 a year, or $200,000 over 10 years, covering investment management plus a written plan for selling vested RSUs over time, coordinating with the family’s CPA and estate attorney, and reviewing beneficiary designations each year.

Option A is cheapest on paper. Whether it is cheapest in practice depends on the decisions nobody in Option A is paid to make. RSUs are taxed as wages at vest, and employers often withhold federal tax at the optional 22% supplemental rate for 2026, rising to a mandatory 37% only on supplemental wages above $1 million in the year (IRS Publication 15, 2026). A household in the 35% or 37% bracket can owe a large balance in April that nobody flagged. In a commission relationship, no one has to raise that. In a fiduciary planning relationship, it is part of the job.

The test for this family is simple: list the decisions you want someone to own (RSU sales, tax withholding gaps, 529 funding, guardianship and trust documents), then ask each firm in writing which of those it will handle and in what capacity.

Mistakes high-earning families make when choosing between them

• Assuming a title means a duty. “Financial advisor” and “wealth manager” are not legal categories. Look the person up on the SEC’s Investment Adviser Public Disclosure site and FINRA BrokerCheck.
• Not asking about capacity per account. Ask: “On my taxable account, my 529s and any insurance, are you acting as a fiduciary or as a broker?”
• Confusing custody protection with investment protection. SIPC covers up to $500,000 per customer, including a $250,000 limit for cash, if a brokerage firm fails. It does not cover market losses or bad advice (SIPC).
• Comparing fees without comparing scope. A low fee for trading is not the same service as a higher fee that includes tax and estate coordination. Compare what each firm puts in writing that it will do.
• Leaving the employer stock plan out of the conversation. For many tech and biotech households, the stock plan account is the largest and least diversified asset. Make sure whoever you hire will advise on it, even if it is held away.

For a fuller checklist on screening any adviser, see what a vetted financial advisor is, and for how common the fiduciary standard actually is, what percentage of advisors are fiduciaries. If you are also weighing a large bank brokerage, our comparison of wirehouses and broker-dealers covers that layer.

What to write down for your children

Children do not see which adviser you chose. They see that “someone handles the money.” Write a one-page note: who advises the family, how that person is paid, what duty they owe, and why you chose that model over the alternatives. Add a line each year on what the adviser actually did. When your children are adults choosing their own adviser, that page will teach them more than any account statement. As Kevin Luu puts it: “Your kids don’t need to inherit your portfolio. They need to inherit your decision-making process.” Our family governance work is built around keeping notes like this.

Common questions

Can one person be both an RIA representative and a broker?

Yes. Many advisers are dually registered, and a dually registered firm’s Form CRS will say so. They can be a fiduciary on an advisory account and a broker on a commission account or an insurance sale. Ask which capacity applies to each account, and get the answer in writing. Their records appear on both the SEC adviser database and FINRA BrokerCheck.

Is a broker-dealer always more expensive than an RIA?

No. For a family that makes a few purchases and holds for many years, commissions can cost less than an annual advisory fee. The cost difference shows up in what is not covered: ongoing monitoring, tax coordination, equity compensation planning and estate work. Compare total cost against the specific work each firm commits to doing.

Does it matter whether an RIA is registered with the SEC or the state?

Not for the duty owed. State-registered and SEC-registered advisers both owe a fiduciary duty. Registration level mostly reflects firm size, with SEC registration generally starting at $100 million under management. Check the adviser’s Form ADV brochure, which describes services, fees, conflicts and any disciplinary history, whichever regulator it is filed with.

Next step

Pull the Form CRS (or, for a state-registered adviser, the Form ADV brochure) for every firm that currently holds your family’s money, including the employer stock plan, and note in one line per account whether the person advising you is acting as a fiduciary or a broker. If you want a second look at how your accounts, equity compensation and tax picture fit together, our investment and risk management and tax management pages explain how Age Five Family Office™ works with families, and the Tax & Wealth Assessment is the place to start.

This article is general education, not individual advice, and the right choice depends on the family’s full picture.

Written by

Kevin Luu

Co-Founder and Chief Learning Officer, Bright Advisers

Kevin has advised high-income W-2 tech and biotech families since 2015, and leads the education-first Age Five Family Office from Brea, California.

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