A family office is a private organization built to manage the wealth, investments, taxes, legal affairs, and personal logistics of an ultra-high-net-worth family under one roof. Family offices go beyond what a brokerage or wealth advisor provides, and the way they are regulated depends heavily on whether they serve one family or several. A qualifying single-family office is excluded from registering as an investment adviser with the SEC; a multi-family office generally is not.
The Three Common Structures
Single-Family Office
A single-family office serves one family exclusively. The family owns it, controls it, and staffs it with professionals who answer only to them. Privacy and customization are maximal. The cost of a full in-house team of investment managers, attorneys, accountants, and support staff is substantial, and industry consensus generally puts the practical threshold at roughly $100 million or more in investable assets before a standalone office makes economic sense.
Multi-Family Office
Families whose wealth falls below that threshold often turn to a multi-family office, a firm that manages the affairs of several unrelated families and operates more like a professional service company. Annual management fees typically range from about 0.50% to 1.25% of assets under management, depending on complexity. You share a team of specialists with other families and get institutional-grade resources at a fraction of the cost of building your own operation.
Virtual Family Office
A virtual family office sits between the other two. It serves a single family, but instead of hiring full-time staff in one location, the family engages a network of remote independent contractors and consultants coordinated by a central manager. Overhead drops, specialists can be brought on and off the team as needs change, and talent selection isn’t limited by geography.
What a Family Office Actually Does
The core function is investment oversight. A chief investment officer or equivalent directs strategy across public equities, fixed income, real estate, and alternative investments, with risk monitoring and rebalancing happening continuously rather than at quarterly check-ins. One growing trend is direct investment in private operating companies rather than committing capital through outside private equity funds, which lets the family exercise more influence and avoid layered fee structures, though it demands deeper due diligence in-house.
Tax planning weaves through every investment decision. The office coordinates with outside CPAs and estate attorneys to structure holdings in ways that minimize tax exposure across generations, including drafting trusts, managing entity elections, and filing returns for what can be a sprawling web of partnerships, LLCs, and holding companies. Centralizing that coordination prevents the conflicting advice that happens when a family uses several unrelated advisors who don’t talk to each other.
Beyond capital, family offices handle the logistical complexity of wealthy households: private travel, multiple residences, security, bill payment, document archiving, and the hiring and supervision of household employees. Philanthropy is another major responsibility, with the office often running private foundations, vetting recipients, and ensuring donations comply with tax-exempt organization rules. Younger family members typically get structured programming on financial literacy so heirs are prepared before they inherit.
Governance and Succession
The biggest threat to a family fortune usually isn’t a bad investment quarter. It’s the third generation. Formal governance is what separates families whose wealth survives across generations from those whose fortunes fragment through infighting or mismanagement.
Many offices help draft a family constitution, a governing document that lays out rules for decision-making, wealth distribution, voting rights, and the responsibilities of family members involved in the office. Regular family meetings give members a structured forum to review performance, discuss strategic direction, and resolve disagreements before they escalate. Dispute resolution provisions belong in the constitution from the start rather than bolted on after conflict erupts. A tiered approach works well: direct negotiation between the parties, mediation if that fails, and binding arbitration as the final step. Arbitration clauses can limit the types of damages available and assign legal costs to the losing party, and keeping disputes out of court protects family privacy.
Succession planning ensures that leadership transitions happen on a timeline the family controls rather than one forced by illness or death. Identifying and developing the next generation of decision-makers years in advance reduces disruption and gives heirs time to build competence.
The SEC Family Office Rule
The regulatory framework centers on the Investment Advisers Act of 1940 and the SEC’s Family Office Rule. A qualifying family office is excluded from the definition of “investment adviser” entirely, so it does not have to register with the SEC or comply with the reporting obligations that apply to commercial advisory firms.1eCFR. 17 CFR 275.202(a)(11)(G)-1 – Family Offices
Three conditions must be satisfied. The office can have no clients other than “family clients,” a defined term that includes current family members, former family members, and certain key employees. It must be wholly owned by family clients and exclusively controlled by one or more family members or family entities. And it must not hold itself out to the public as an investment adviser.1eCFR. 17 CFR 275.202(a)(11)(G)-1 – Family Offices
A limited grandfathering provision protects offices that were operating before January 1, 2010, and were advising certain persons who would not otherwise qualify as family clients, including officers, directors, and employees of the family office who are accredited investors and who invested with the office before that date.1eCFR. 17 CFR 275.202(a)(11)(G)-1 – Family Offices Offices relying on the grandfather remain subject to certain antifraud provisions of the Advisers Act.
These boundaries need active monitoring. Taking on a non-family client, marketing services publicly, or losing family control of the entity can strip the exclusion and expose the office to retroactive registration requirements and enforcement action.
When a Multi-Family Office Must Register
The Family Office Rule exclusion does not extend to multi-family offices because they serve unrelated families. A multi-family office that provides investment advice for compensation meets the statutory definition of an investment adviser and must register unless another exemption applies.
Whether registration is with the SEC or a state regulator depends primarily on assets under management. An adviser managing $110 million or more in regulatory assets under management must register with the SEC. Advisers with between $100 million and $110 million may register with the SEC. Advisers managing between $25 million and $100 million generally register at the state level, though they may qualify for SEC registration if they are exempt from registration in their home state or not subject to examination there. An adviser already registered with the SEC can remain registered as long as its assets under management stay at or above $90 million.2SEC.gov. Form ADV – General Instructions
Multi-family offices that advise only private funds and manage less than $150 million in U.S. assets may qualify as exempt reporting advisers, filing abbreviated reports with the SEC and avoiding full registration. Once assets reach $150 million, full registration is required unless another exemption applies.2SEC.gov. Form ADV – General Instructions
Household Employment Rules
Families that employ domestic workers across multiple properties need to pay attention to federal wage and hour rules. The Fair Labor Standards Act requires covered household employees to receive at least the federal minimum wage of $7.25 per hour and overtime pay of one and a half times their regular rate for hours over 40 in a workweek. A narrow exemption applies to live-in domestic employees, who are exempt from overtime but must still receive minimum wage.3Federal Register. Application of the Fair Labor Standards Act to Domestic Service Workers’ compensation requirements vary by state, with some mandating coverage starting with a single household employee. These obligations are easy to overlook when staff are spread across properties in multiple jurisdictions.
Beneficial Ownership Reporting After the 2025 Rule Change
The Corporate Transparency Act originally required most domestic companies, including LLCs and corporations commonly used as family office vehicles, to file beneficial ownership information reports with the Financial Crimes Enforcement Network. A March 2025 interim final rule exempted all domestic reporting companies from the filing requirement.4Federal Register. Beneficial Ownership Information Reporting Requirement Revision and Deadline Extension A family office organized as a domestic entity does not need to file initial, updated, or corrected beneficial ownership reports.
Foreign reporting companies are not exempt. A family office structured through a foreign entity registered to do business in the United States must still file beneficial ownership reports within 30 days of registration. Those reports need not identify U.S. person beneficial owners, but the filing obligation itself remains.4Federal Register. Beneficial Ownership Information Reporting Requirement Revision and Deadline Extension
A separate “large operating company” exemption remains relevant for foreign entities. To qualify, a company needs more than 20 full-time U.S. employees, over $5 million in gross receipts or sales on its prior-year federal tax return (excluding foreign-source income), and a physical office in the United States that the entity owns or leases and that is distinct from any other unaffiliated company’s workspace.5FinCEN.gov. Frequently Asked Questions Families with international structures should confirm which entities fall on which side of the domestic and foreign line.
Can a Family Office Deduct Its Operating Expenses?
Whether a family office can deduct its operating costs as business expenses is one of the more consequential tax questions these entities face. Federal law allows a deduction for ordinary and necessary expenses paid in carrying on a trade or business.6Office of the Law Revision Counsel. 26 U.S. Code 162 – Trade or Business Expenses Managing your own investments, however large the portfolio, does not by itself qualify as a “trade or business” under longstanding Supreme Court precedent.
An office that wants to deduct salaries, rent, technology, and other overhead needs to demonstrate it is doing something more than passively overseeing investments. Offices that charge fees for advisory services, manage assets for multiple family entities, or operate in a manner comparable to a commercial investment adviser have a stronger argument. The Tax Court has addressed the issue in a memorandum opinion, finding that a multi-generational family office qualified as a trade or business because it provided advisory and financial planning services and received compensation beyond ordinary investment returns. That opinion carries no binding precedential value, so the question remains fact-specific and unsettled, and it warrants close work with tax counsel if deductibility is a priority.