A fiduciary CPA is a Certified Public Accountant who is legally required to put your financial interests ahead of their own when giving investment advice. That legal duty comes from registering as an investment adviser under federal securities law, which sits on top of the CPA’s tax and accounting license. Most financial professionals operate under weaker standards that let them recommend products that pay them more, as long as those products are broadly appropriate for you. If you want tax planning and investment advice from the same person without hidden incentives, a fiduciary CPA is the professional to look for.
What the Fiduciary Duty Actually Requires
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 Courts and the SEC have read that statute as creating two core obligations: a duty of loyalty and a duty of care.2Securities and Exchange Commission. Commission Interpretation Regarding Standard of Conduct for Investment Advisers
The duty of loyalty means the adviser cannot put their own financial interests or their firm’s profitability ahead of yours. If 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 the fiduciary standard that conflict has to be transparent and managed in your favor.
The duty of care requires competent, informed advice based on a genuine understanding of your finances, goals, and risk tolerance. It isn’t a one-time assessment at account opening. The obligation runs across the entire advisory relationship, so the adviser has to monitor your situation and update recommendations as things change.2Securities and Exchange Commission. Commission Interpretation Regarding Standard of Conduct for Investment Advisers If your adviser builds a plan at intake and never looks at it again, they are falling short.
Why This Standard Is Different from What Most Advisers Owe You
Not every financial professional is held to this bar, and the language they use often makes the difference hard to see.
Broker-dealers historically operated under a suitability standard, which required only that a recommendation be generally appropriate for your profile. A broker could recommend a product paying a larger commission over a cheaper alternative as long as both fit. In 2019 the SEC adopted Regulation Best Interest, which requires brokers to act in the customer’s best interest when making recommendations to retail customers and to address conflicts through disclosure, mitigation, or elimination.3U.S. Securities and Exchange Commission. Regulation Best Interest4Securities and Exchange Commission. Regulation Best Interest: The Broker-Dealer Standard of Conduct Reg BI sounds close to the fiduciary standard. It still falls short in one critical way: it applies only at the moment a recommendation is made, not continuously across the relationship.
Some professionals are registered as both a broker-dealer representative and an investment adviser representative. Wearing the broker hat, they follow Reg BI. Wearing the adviser hat, they owe a fiduciary duty. Clients often can’t tell which hat is on at any given moment, and the SEC has flagged cases where dual-registered professionals failed to disclose the capacity they were acting in.5U.S. Securities and Exchange Commission. Staff Bulletin: Standards of Conduct for Broker-Dealers and Investment Advisers Conflicts of Interest That’s why “are you a fiduciary?” isn’t enough. The follow-up is: are you a fiduciary for all of the services you provide to me, all of the time?
One boundary worth naming. A CPA doing your tax return is bound by the AICPA Code of Professional Conduct, which requires integrity, objectivity, due care, and disclosure of conflicts.6AICPA & CIMA. Professional Responsibilities Those are real ethical obligations, but they are not the federal fiduciary standard. The fiduciary duty is triggered by the investment adviser registration, not by the CPA license alone.
Fee-Only vs. Fee-Based: Read Compensation Carefully
Compensation is the single fastest way to see whether an adviser’s incentives line up with yours, and the naming 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 that recommendation isn’t influenced by a 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 conflict: the adviser has a financial reason to recommend commissionable products even when a cheaper alternative would serve you better. Fee-based advisers can still be registered investment advisers with a fiduciary duty, but the conflicts they must manage and disclose are larger.
For most people looking for a fiduciary CPA, fee-only is the cleanest structure. It doesn’t guarantee perfect advice, but it removes the most common source of bias. If an adviser calls themselves fee-based, ask which products generate commissions and how much. A vague answer is an answer.
What a Fiduciary CPA Actually Does
The advantage of a fiduciary CPA over a standalone financial planner is that tax expertise runs through 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, other income, and where rates are heading. Investment advice gets filtered through a tax lens, which is where most of the money is actually saved or lost.
Typical services include:
- Roth conversion planning, sizing each year’s conversion to fill a lower bracket without spilling into a higher one and tracking the separate five-year holding period that applies to each conversion.
- Section 1031 like-kind exchanges for investment real estate, where deferring capital gains depends on meeting a 45-day identification deadline and a 180-day closing deadline and using a qualified intermediary to hold the sale proceeds.7Office of the Law Revision Counsel. 26 U.S. Code 1031 – Exchange of Real Property Held for Productive Use or Investment8Internal Revenue Service. Like-Kind Exchanges – Real Estate Tax Tips
- Tax-loss harvesting coordinated against your overall income picture for the year, with attention to wash sale rules.
- Planning around major tax legislation. The One Big Beautiful Bill Act, signed into law in July 2025, changed the federal tax landscape and is exactly the kind of shift a fiduciary CPA translates into bracket, deduction, and estate-planning decisions.9Internal Revenue Service. One, Big, Beautiful Bill Provisions
What It Costs
Fee-only fiduciary advisers typically charge through one of four structures, and many fiduciary CPAs use a combination depending on the engagement:
- Percentage of assets under management, with roughly 1% per year as the industry median. A $500,000 portfolio runs about $5,000 annually, and rates often decrease for larger portfolios.
- 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, useful for one-time questions like evaluating a Roth conversion or reviewing an estate plan.
- Per-plan fee, often around $3,000 for a one-time comprehensive plan, varying with complexity.
These figures reflect general fee-only advisor 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 no additional commissions or referral fees apply.
How to Verify a Fiduciary CPA Before You Hire
Verifying a fiduciary claim takes roughly 15 minutes of online research and a few pointed questions.
Ask Directly, Then Ask Again
Start with: are you legally a fiduciary for all of the services you provide to me, regardless of how you’re compensated? Anyone can claim to act in your best interest; you want confirmation of a legal obligation. Follow up on compensation. If they mention commissions on insurance or investment products, they are fee-based, not fee-only. Ask whether they or their firm have any broker-dealer affiliations, and if so, 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 – Homepage11Investor.gov. Form ADV12U.S. Securities and Exchange Commission. Form ADV Part 2 Firms managing $100 million or more in client assets generally register with the SEC; smaller firms register with the state securities regulator. If the firm isn’t in the SEC database, check your state.
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, verify it through the AICPA.13AICPA & CIMA. Personal Financial Specialist PFS Credential14FINRA.org. Series 65 – Uniform Investment Adviser Law Exam15NASAA. Exam FAQs
Confirm Independent Custody of Your Assets
Your money should be held by an independent qualified custodian, meaning a bank or brokerage firm, not by the adviser directly. SEC rules require registered investment advisers with custody of client assets to maintain them with a qualified custodian specifically to protect against misuse or loss.16eCFR. 17 CFR 275.206(4)-2 – Custody of Funds or Securities of Clients by Investment Advisers You should receive statements directly from the custodian, not just from the adviser. Those custodian statements are your independent check that your 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, disclose all material conflicts, and exercise professional skill and diligence. Resistance to putting this in writing is itself an answer.
If a Fiduciary CPA Breaches the Duty
If you believe a fiduciary CPA acted against your interests, you have several avenues for recourse, and you can pursue more than one at the same time.
- File a complaint with the SEC through its online portal, which can investigate registered investment advisers for violations of the Advisers Act. For state-registered advisers, file with your state securities regulator.17U.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. 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.18AICPA & CIMA. How to File an AICPA Ethics Complaint
- Report to the State Board of Accountancy, which can investigate professional misconduct and act on 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. These cases often turn on 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.