Plan on at least $100 million in net worth before a dedicated single-family office makes financial sense, and expect to spend $500,000 to $1.5 million getting it off the ground plus 1% to 3% of total net worth every year to run it. That is the short answer to how much money you need to start a family office. Below the $100 million mark, the fixed costs of staff, technology, and compliance eat too much of the asset base to justify the structure, and most families in that range are better served by a multi-family office.
The Net Worth Threshold
A single-family office centralizes investment management, tax planning, estate administration, and philanthropic coordination under one private entity controlled by the family. The $100 million benchmark is a floor, not a target. Some advisors set the bar considerably higher and argue that a full-fledged office with eight or more employees should not be built unless the family is worth at least $1 billion. A fully staffed operation is often said to need $500 million or more behind it.
The math is simple. A family office has high fixed costs regardless of how much money it manages. Salaries, office space, technology, insurance, and compliance fees don’t scale down just because the asset base is smaller. Spend $1 million a year running an office on $50 million in assets and you’ve handed 2% of your wealth to overhead before paying a single investment fee. On $500 million, that same $1 million is 0.20%.
Complexity shifts the break-even point. Families holding private equity positions, real estate across multiple countries, or operating businesses with complicated tax structures reach the point where an office pays for itself sooner than families with simpler portfolios.
What Setup Costs Cover
Launching an office means building its legal, operational, and technological foundation from scratch. Families generally spend between $500,000 and $1,500,000 during the setup phase, with legal entity formation and technology infrastructure driving most of the bill.
Legal Entity Formation
The office itself needs a legal structure. The most common choices are a limited liability company, a private family trust company, or some combination of both. An LLC can be formed quickly through a state secretary of state filing and provides liability protection and operational flexibility. A private family trust company requires more specialized legal work but offers greater privacy, because trust details are generally not part of the public record in most states. Many families use both: an LLC as the operating entity and one or more trusts to hold and protect assets across generations.
Drafting operating agreements, governance charters, and investment policy statements requires attorneys experienced in ultra-high-net-worth structures, and those fees typically account for the largest share of initial setup costs. Formal employment contracts, confidentiality agreements, and succession protocols should be in place from day one.
Technology and Cybersecurity
Portfolio management software, accounting platforms, and secure document storage all require upfront licensing and installation. Family offices handle account numbers, tax returns, trust documents, and personal information for multiple family members, so cybersecurity is a line item from the start. Firewalls, encrypted communications, multi-factor authentication, and vulnerability monitoring are standard. Annual cybersecurity spending varies with the complexity of the operation but shows up in both setup and ongoing budgets.
Annual Operating Costs
Once the office is running, annual costs typically land between 1% and 3% of total net worth for a fully staffed operation. On $200 million, that is $2 million to $6 million a year. Benchmarking data suggest that internal operating costs alone average roughly 0.40% to 0.55% of assets under management for offices in the $200 to $500 million range, with the percentage declining as the office gets larger. The higher end of the 1% to 3% range reflects all-in costs, including external investment manager fees, fund expenses, and transaction costs on top of internal overhead.
Staff Compensation
Personnel is the largest recurring expense by a wide margin. A chief investment officer, responsible for portfolio strategy, manager selection, and market monitoring, commands significant compensation that varies with the office’s size and investment complexity. Total packages including salary and performance bonuses commonly reach seven figures at larger offices. Beyond the CIO, most offices employ or retain tax specialists, accountants, an estate planning attorney, and administrative staff. Smaller offices outsource some of these roles to keep headcount low; larger operations build fully internal teams.
Audit, Compliance, and Legal Fees
Annual auditing and regulatory filing costs add $50,000 to $150,000 or more depending on the complexity of the asset structure. These cover independent financial audits, tax return preparation for multiple entities, and any required regulatory filings. Ongoing legal counsel is needed to update trust documents, review employment contracts, and respond to changes in tax law.
Insurance
Family offices carry directors and officers liability, errors and omissions, and cyber liability policies at minimum. Annual premiums for a single-family office managing $100 million to $500 million with 5 to 15 staff members generally run $40,000 to $85,000 for a comprehensive program. Smaller offices with fewer staff and lower assets under management may pay $15,000 to $40,000. Premiums vary with the office’s investment activities, employee count, and claims history.
Structuring the Office So Expenses Are Deductible
Whether your office can deduct its operating expenses — salaries, rent, technology, professional fees — turns on whether the IRS considers it a trade or business rather than a personal investment activity. Ordinary and necessary expenses paid in carrying on a trade or business are deductible under federal tax law, including reasonable compensation for services, travel, and rent on business property.1Office of the Law Revision Counsel. 26 USC 162 – Trade or Business Expenses
The statute does not precisely define “trade or business.” Courts have read it to mean an activity conducted with continuity and regularity and with a primary purpose of earning income. For a family office, the question is whether the office provides genuine advisory services to family members, similar to what an outside firm would provide, or simply manages the family’s own passive investments.
In the Lender Management case, the Tax Court found that a family office qualified as a trade or business because it provided investment management and financial planning services to family members comparable to those of a hedge fund manager. Critical factors included that the office received compensation through a profits interest structure, family members could withdraw their money, and the family members were geographically dispersed with distinct financial needs requiring tailored advice. Families that want to maximize deductibility should structure the office along those lines: documented service agreements, arm’s-length fee arrangements, and evidence that the office operates like a professional advisory firm.
If the office does not qualify, its operating expenses may be treated as personal investment expenses, which face significant limitations under current tax law. Getting this right at the structuring stage can save hundreds of thousands of dollars a year, making it one of the most consequential decisions you make.
The SEC Family Office Exclusion
A family office that serves only its own family does not need to register with the SEC as an investment adviser. Federal law excludes “any family office, as defined by rule” from the definition of an investment adviser under the Investment Advisers Act.2Office of the Law Revision Counsel. 15 USC 80b-2 – Definitions The implementing regulation requires three conditions: the office has no clients other than “family clients” (family members, certain key employees, family-controlled trusts and estates, and charitable organizations funded exclusively by the family); the office is wholly owned by family clients and exclusively controlled by family members or family entities; and the office does not hold itself out to the public as an investment adviser.3eCFR. 17 CFR 275.202(a)(11)(G)-1 – Family Offices
Open the office to outside investors and you lose the exclusion. The office then has to register with the SEC or a state securities authority and file Form ADV, a detailed disclosure covering ownership, business practices, employees, disciplinary history, and conflicts of interest.4SEC.gov. Form ADV – General Instructions Losing the exclusion brings significant ongoing compliance costs, so the boundary should be built into your governance documents from the start.
When a Multi-Family Office Is the Better Answer
If you’re below the $100 million threshold — or even above it, but without the complexity that justifies dedicated staff — a multi-family office is the usual alternative. An MFO serves several wealthy families through a shared team of professionals, spreading the cost of staff, technology, and infrastructure across clients. Most MFOs work with families holding at least $30 million.
Instead of millions in annual overhead, MFO clients typically pay a percentage of assets under management, generally 0.50% to 2.00% depending on portfolio size, service complexity, and the specific firm. A family with $50 million paying 0.75% spends $375,000 a year — a fraction of what a dedicated office would cost. Some MFOs also charge performance fees on top of the base management fee.
MFOs are registered investment advisers, so they file Form ADV with the SEC and are subject to oversight that single-family offices qualifying for the exclusion avoid.4SEC.gov. Form ADV – General Instructions For the client, that registration is a transparency feature: you can review disclosures, conflicts of interest, and disciplinary history in the SEC’s public database before signing on.
The trade-off is control. In a single-family office, you dictate the investment mandate, hire and fire staff, and set every policy. In an MFO, you are one of several clients, and the office balances your preferences against its broader operations. For families whose complexity doesn’t justify a standalone office, an MFO delivers institutional-quality estate planning, tax work, philanthropic coordination, and access to alternative investments at a manageable cost.