A fiduciary CPA is a Certified Public Accountant who is also registered as an Investment Adviser, which legally obligates them to put your financial interests ahead of their own when giving investment advice. The CPA license covers tax and accounting competence. The investment adviser registration adds a federal duty of loyalty and care on top of it. Most financial professionals operate under weaker standards that let them earn more by steering you toward particular products, so the combination matters: a fiduciary CPA can give you integrated tax and investment advice without hidden incentives pulling the recommendation off center.
The Legal Duty Behind the Label
The fiduciary standard for investment advisers comes from Section 206 of the Investment Advisers Act of 1940, which prohibits advisers from engaging in any practice that operates as fraud or deceit on a client.1Office of the Law Revision Counsel. 15 U.S. Code 80b-6 – Prohibited Transactions by Investment Advisers The SEC and the courts have read that statute as creating two core obligations.2Securities and Exchange Commission. Commission Interpretation Regarding Standard of Conduct for Investment Advisers
The duty of loyalty means the adviser cannot put their own finances or their firm’s profitability ahead of yours. Where a conflict of interest exists, the adviser must either eliminate it or disclose it fully enough that you can make an informed decision about whether to proceed. An adviser who earns a commission by steering you into a particular mutual fund has a conflict, and under this standard that conflict has to be transparent and managed in your favor.
The duty of care requires competent, informed advice built on a real understanding of your financial situation, goals, and risk tolerance. It isn’t a one-time assessment at account opening. The duty applies to the entire advisory relationship and is ongoing, so the adviser must monitor your circumstances and update recommendations as things change.2Securities and Exchange Commission. Commission Interpretation Regarding Standard of Conduct for Investment Advisers If an adviser sets up a plan and never looks at it again, that falls short.
How This Differs From Other Standards You May Encounter
Not every professional giving financial advice is held to the same bar. Knowing the differences will keep you from assuming someone is legally in your corner when they may not be.
Brokers Under Regulation Best Interest
Broker-dealers historically operated under a suitability standard, which only required a recommendation to be generally appropriate for your financial profile. In 2019 the SEC adopted Regulation Best Interest to raise the standard for brokers making recommendations to retail customers.3U.S. Securities and Exchange Commission. Regulation Best Interest Reg BI requires brokers to act in the customer’s best interest and address conflicts of interest through disclosure, mitigation, or elimination.4Securities and Exchange Commission. Regulation Best Interest: The Broker-Dealer Standard of Conduct
Reg BI sounds close to the fiduciary standard, but it applies only at the time a recommendation is made. A registered investment adviser owes you a continuous fiduciary duty. A broker under Reg BI owes “best interest” conduct at the point of each recommendation, with no obligation to monitor or revisit that advice later.
CPAs Under the AICPA Code
Every AICPA member follows a Code of Professional Conduct that requires integrity, objectivity, due care, and full disclosure of conflicts of interest.5AICPA & CIMA. Professional Responsibilities These are meaningful ethical obligations, but they are not the same as the legal fiduciary standard imposed on registered investment advisers. A CPA doing your taxes is bound by the AICPA Code. A CPA managing your investment portfolio as a registered adviser is bound by both the AICPA Code and the federal fiduciary standard. The investment advisory registration is what triggers the higher legal duty.
Dual Registration
Some professionals are registered as both a broker-dealer representative and an investment adviser representative. When they wear the broker hat they follow Reg BI; when they wear the adviser hat they owe you a fiduciary duty. Clients rarely know which hat the professional is wearing at any given moment, and the SEC has found that some dual-registered professionals failed to disclose which capacity they were acting in when making recommendations.6U.S. Securities and Exchange Commission. Staff Bulletin: Standards of Conduct for Broker-Dealers and Investment Advisers Conflicts of Interest This is why “are you a fiduciary?” isn’t enough on its own. Follow up with: “Are you a fiduciary for all of the services you provide to me, all of the time?” A CPA who operates exclusively as a registered investment adviser, with no broker-dealer affiliation, eliminates the ambiguity.
Fee-Only Versus Fee-Based
Compensation structure is the single fastest way to gauge whether an adviser’s incentives line up with yours. The terminology is confusing on purpose.
A fee-only adviser is paid exclusively by you. No commissions, no referral fees, no bonuses from product companies. When a fee-only adviser recommends an index fund over an actively managed fund, you can trust the recommendation isn’t influenced by a commission check from the fund company. The National Association of Personal Financial Advisors defines fee-only practice as receiving no compensation contingent on the purchase or sale of a financial product, and specifically excludes arrangements like 12b-1 fees, insurance rebates, and transaction-based wrap fees.
A fee-based adviser, despite the similar name, earns a mix of client fees and commissions from selling financial products. The commission income creates a built-in reason to recommend products that generate commissions, even when a cheaper or simpler alternative would serve you better. Fee-based advisers can still be registered investment advisers and owe a fiduciary duty, but the conflicts they must manage and disclose are significantly greater.
Fee-only is the cleaner structure for most people seeking a fiduciary CPA. It doesn’t guarantee perfect advice, but it removes the most common source of bias. If an adviser describes themselves as “fee-based,” ask which products generate commissions and how much those commissions are. A vague answer tells you something.
What a Fiduciary CPA Actually Does
The real advantage of a fiduciary CPA over a standalone financial planner is the integration of tax expertise into every recommendation. A planner might suggest a Roth conversion. A fiduciary CPA models exactly how much of your traditional IRA to convert this year based on your marginal bracket, your other income, and where rates are heading. Every piece of investment advice gets filtered through a tax lens, which is where most of the money is actually saved or lost.
Roth conversion planning is a typical example. Converted amounts count as taxable income in the year of the conversion, so timing and size matter. A fiduciary CPA calculates how much to convert to fill up a lower bracket without pushing you into a higher one, and tracks the five-year holding period that applies separately to each conversion. Withdraw converted funds before that five-year mark while under age 59½ and you face a 10% early withdrawal penalty on top of income taxes.
Real estate planning is another. Section 1031 of the Internal Revenue Code allows you to defer capital gains tax when you sell investment property and reinvest the proceeds into similar property.7Office of the Law Revision Counsel. 26 U.S. Code 1031 – Exchange of Real Property Held for Productive Use or Investment You have 45 days to identify replacement property and 180 days to close the purchase; miss either deadline and the entire gain becomes immediately taxable.8Internal Revenue Service. Like-Kind Exchanges – Real Estate Tax Tips
Tax-loss harvesting, done as part of an integrated annual strategy rather than a December afterthought, is a third. And legislative shifts drive planning throughout the year. The One Big Beautiful Bill Act, signed into law in July 2025, significantly changed the federal tax landscape.9Internal Revenue Service. One, Big, Beautiful Bill Provisions Working out how new legislation affects your bracket, deductions, and estate planning is where a fiduciary CPA earns the fee.
How to Verify Someone Is Actually a Fiduciary CPA
Verifying a fiduciary claim takes about 15 minutes of online research and a few pointed questions. Skipping it is where people get burned.
Ask the Right Questions
Open with: “Are you legally a fiduciary for all of the services you provide to me, regardless of compensation?” Not “do you act in my best interest.” Anyone can claim that. You want confirmation of a legal obligation. Follow up with how they are paid. If commissions on insurance or investment products come up, they are fee-based, not fee-only. Ask whether they or their firm hold any broker-dealer affiliations. If yes, ask how they manage the different standards that apply in each capacity.
Check the IAPD Database
The SEC’s Investment Adviser Public Disclosure site at adviserinfo.sec.gov lets you search any registered investment adviser or representative for free.10Investment Adviser Public Disclosure. Investment Adviser Public Disclosure – Homepage Look up the firm and pull its Form ADV. Part 2 is the firm’s brochure, which must disclose the types of advisory services offered, the complete fee schedule, any conflicts of interest, and material disciplinary events involving the firm or its personnel.11U.S. Securities and Exchange Commission. Form ADV Part 2 Form ADV itself details services, fees, conflicts, and disciplinary history.12Investor.gov. Form ADV If the firm isn’t in the IAPD database, they’re either registered at the state level (check your state securities regulator) or they aren’t a registered investment adviser at all.
Verify the CPA License and Any Credentials
Confirm the CPA license is active and in good standing through the relevant State Board of Accountancy. If the adviser claims the AICPA’s Personal Financial Specialist designation, you can verify it through the AICPA.13AICPA & CIMA. Personal Financial Specialist PFS Credential PFS isn’t required to operate as a fiduciary CPA, but it signals specialization beyond basic tax work. These checks are quick and free, and they occasionally reveal a lapsed license or a dropped credential the adviser forgot to mention.
Confirm an Independent Custodian Holds Your Assets
Your money should be held by an independent qualified custodian, a bank or brokerage firm, not by the adviser directly. The SEC requires registered investment advisers who have custody of client assets to maintain them with a qualified custodian specifically to protect against misuse or loss.14eCFR. 17 CFR 275.206(4)-2 – Custody of Funds or Securities of Clients by Investment Advisers You should receive account statements directly from the custodian, not just from the adviser. Those statements are your independent verification that the assets are where they should be.
Get the Fiduciary Commitment in Writing
Ask the adviser to confirm the fiduciary obligation in writing as part of the engagement agreement. A genuine fiduciary will have no hesitation. The agreement should state that the adviser will act in your best interest, provide full disclosure of all material conflicts, and exercise professional skill and diligence. Resistance to putting this in writing tells you what you need to know.
What You Should Expect to Pay
Fee-only fiduciary advisors generally charge through one of four structures, and many fiduciary CPAs combine them depending on the engagement:
- A percentage of assets under management, with about 1% per year as the industry median. A $500,000 portfolio would run roughly $5,000 a year. Rates often step down for larger portfolios.
- A flat annual retainer, typically $2,500 to $9,200 per year for ongoing comprehensive planning. This structure is increasingly popular because it doesn’t create an incentive to gather more assets.
- Hourly consultation, roughly $200 to $400 per hour, which fits one-time questions or specific issues like evaluating a Roth conversion or reviewing an estate plan.
- A per-plan fee, with a one-time comprehensive financial plan often running around $3,000, varying with complexity.
These figures reflect general fee-only pricing nationwide. A fiduciary CPA who provides both tax preparation and investment management may bundle or separate those services. Ask for a complete fee schedule in writing before signing an engagement letter, and confirm that no additional commissions or referral fees apply.
If a Fiduciary CPA Breaches the Duty
If you believe your fiduciary CPA has acted against your interests, you have more than one route, and you can pursue them in parallel.
- File a complaint with the SEC through its online portal. The SEC can investigate registered investment advisers for violations of the Advisers Act. For state-registered advisers, file with your state securities regulator instead.15U.S. Securities and Exchange Commission. Report a Problem with an Investment Account or Financial Professional
- File an AICPA ethics complaint if the CPA is an AICPA member. Submit through the AICPA’s online complaint form or by mail to the Professional Ethics Division. The AICPA can investigate and impose sanctions up to expulsion from membership, but it cannot award damages or settle financial claims between you and the adviser.16AICPA & CIMA. How to File an AICPA Ethics Complaint
- Report to the State Board of Accountancy, which can investigate professional misconduct and take action against the CPA license itself, including suspension or revocation.
- Pursue a civil lawsuit for breach of fiduciary duty. Recoverable damages can include investment losses attributable to the breach, disgorgement of fees, and in some cases punitive damages.
Document everything from the start of the relationship. Save account statements, emails, engagement letters, and any written recommendations. Fiduciary breach cases often come down to whether you can show the adviser knew about a conflict and failed to disclose it, or recommended a strategy that served their interests over yours. The Form ADV disclosures you reviewed during vetting become important evidence if it comes to that.