Starting a family office means defining what the family needs, choosing between a single family office, a multi family office, or a virtual model, then building the legal structure, the team, and the governance to run it. Most families that build a dedicated single family office have at least $100 million in assets, because a full operation commonly costs $1 million or more per year to run, according to published estimates from NerdWallet and major private banks.
This guide walks through the process step by step: purpose, structure choice, legal setup, hiring order, cost realities, governance, and the mistakes that show up most often in year one.
Step 1: Define the purpose and scope
A family office can do many things: manage investments, consolidate reporting across accounts and entities, handle tax and estate planning, run philanthropy, pay bills, manage properties, and educate the next generation. Trying to do all of it from day one is the fastest way to blow the budget.
Write a short mandate document before anything else. Useful questions to answer:
- What problem is the office solving? Liquidity event, complexity, succession, privacy, or direct investing ambitions?
- Which services are essential in year one, and which can wait or stay outsourced?
- Who does the office serve? One generation, several branches, related trusts and foundations?
- What is the investment mandate? Preserve capital, grow it, or deploy it into direct deals?
That last question matters for staffing and cost. In our database of more than 2,700 active family offices, 42% are active in startups, 38% in private equity, and 28% in real estate. Direct investing at that level requires deal professionals, which changes the entire cost profile of the office. For background on what these organizations actually do, see our primer on what a family office is.
Step 2: Choose the model: SFO, MFO, or virtual
There are three main paths, and the choice drives everything downstream.
Single family office (SFO). A dedicated legal entity with its own staff, serving one family. Maximum control, maximum privacy, maximum cost. This is the dominant model among established offices: single family offices make up 74% of our database of more than 2,700 active family offices.
Multi family office (MFO). A firm that serves several families and spreads fixed costs across them. Families typically pay a fee based on assets under management. Entry points are far lower, often in the $30 million range, and the family skips the burden of being an employer. Multi family offices represent 20% of our database.
Virtual family office (VFO). A lean model where the family employs one or two trusted people (or nobody at all) and coordinates a network of outside providers: investment consultant, accountant, attorney, bookkeeper. Technology handles consolidated reporting. This has become a popular starting point for families in the $30 million to $100 million range who want SFO-style control at a fraction of the cost.
Many families start virtual or with an MFO and graduate to a full SFO later. Our comparison of the single family office vs multi family office models goes deeper on the trade-offs.
Step 3: Set up the legal structure
The typical single family office is a separate legal entity, most often an LLC or a corporation, owned by the family or its trusts. Key workstreams with your attorneys:
- Entity choice and domicile. An LLC is the common default in the United States for flexibility and pass-through treatment. Some families use a C corporation structure, in part influenced by the Lender Management case, which supported treating a properly structured family office as a trade or business for expense deductibility. Get specific tax advice here; the details decide whether office expenses are deductible.
- Regulatory position. In the United States, the SEC's Family Office Rule (Rule 202(a)(11)(G)-1 under the Investment Advisers Act) generally exempts an office that serves only family clients, is family-owned and controlled, and does not hold itself out as an investment adviser. Cross any of those lines, for example by managing money for non-family members, and registration questions arise.
- Employment, insurance, and privacy. The office becomes an employer with payroll, benefits, D&O and cyber insurance, and confidentiality agreements.
- Alignment with the estate plan. The office should sit correctly relative to existing trusts, holding companies, and foundations rather than being bolted on beside them.
Guides from J.P. Morgan Private Bank and Deloitte cover these structural questions in detail and are worth reading before the first legal bill arrives.
Step 4: Hire in the right order
Hiring is where budgets are made or broken. A sensible sequence for most new offices:
- A leader the family trusts. Usually a CEO or president, sometimes titled Chief of Staff in smaller offices. Often this person combines financial and operational judgment and becomes the family's single point of contact.
- Finance and controls. A CFO or controller who owns consolidated reporting, cash management, bill pay, and coordination with outside accountants. For many offices this is hire number one if the leader is a family member.
- Investment leadership. A CIO only when the mandate justifies it. A full investment team is the most expensive part of any office; families with a passive mandate often outsource this to an OCIO provider for years.
- Operations and support. Executive assistants, a property or household manager, and eventually legal counsel in-house once outside counsel spend justifies it.
A common pattern: start with two to four people, outsource everything else, and add headcount only when a function is clearly cheaper or better in-house.
Step 5: Face the cost realities
Published estimates cluster around a few consistent numbers:
- NerdWallet reports that running a traditional family office generally costs at least $1 million per year, which is why the model is associated with families of $100 million or more.
- Industry benchmarks such as Aleta's cost guide commonly place total annual operating costs at roughly 1% to 2% of assets for smaller offices, with the percentage falling as assets grow.
- The staff is the biggest line. Compensation typically consumes well over half the budget, and a credible CIO alone can cost several hundred thousand dollars a year before incentives.
The math explains the thresholds. A $1.5 million annual budget is 1.5% of a $100 million fortune and 0.3% of a $500 million fortune. The same office that is a rounding error for one family is a heavy drag for another. Family offices as a group keep growing anyway: CNBC, citing Deloitte research, reported more than 8,000 single family offices worldwide, with assets projected to reach $5.4 trillion by 2030.
Step 6: Put governance in writing
Governance is what keeps the office useful after the founder steps back. The core documents:
- A family charter or constitution stating the mission, values, and how decisions get made.
- An investment policy statement (IPS) covering objectives, asset allocation ranges, liquidity needs, and who can approve what.
- A board or investment committee, often including one or two trusted outsiders, with a regular meeting cadence.
- Succession and education plans for both the family and key employees.
Offices that skip this stage tend to drift into acting as the founder's personal trading account with staff attached, and the structure struggles the moment the founder steps back or the next generation takes over. Formal governance also makes the office legible to outside partners: fund managers and founders who research offices in directories, as covered in our guide to the best family office databases, consistently favor offices with clear decision makers and a stated mandate.
Common first-year mistakes
- Building for the peak on day one. Hiring a full investment team before the mandate is proven burns budget fast. Start lean and add roles as the workload proves itself.
- Underestimating total cost. Salaries are visible; technology, compliance, insurance, office space, and recruiting fees surprise people. Budget a contingency of 20% or more in year one.
- Hiring for prestige instead of fit. A star fund manager may be miserable running bill pay and estate logistics. The first hires need range and low ego.
- Skipping the reporting foundation. Without consolidated reporting across entities from the start, the office spends year two rebuilding its books.
- No written mandate. Every service request from every family member becomes a negotiation. The charter is the office's job description.
- Ignoring the peer landscape. New offices benefit from studying how comparable offices structure teams and investments. Our roundup of family office statistics is a fast way to benchmark against the wider market.
FAQ
How much money do you need to start a family office? A dedicated single family office generally makes sense from around $100 million in assets, since running one commonly costs $1 million or more per year. Multi family offices accept clients from roughly $30 million, and virtual family offices can work below that.
How long does it take to set up a family office? Plan on six to twelve months from mandate to a functioning office: entity formation and regulatory review take weeks, while hiring the first two or three people and standing up reporting systems takes most of the time.
Do family offices need to register with the SEC? Generally no, provided the office fits the SEC's Family Office Rule: it serves only family clients, is wholly owned and controlled by the family, and does not hold itself out to the public as an investment adviser. Legal advice is essential before relying on the exemption.
Sources
- NerdWallet: Family Offices, When to Use One and What It Costs
- J.P. Morgan Private Bank: The why, who, what and how of starting a family office
- Deloitte: The Art of Forming Your Family Office
- Aleta: Family Office Costs and Fees Explained
- CNBC: Family offices are about to surpass hedge funds, with $5.4 trillion in assets by 2030
For a working list of family offices with named decision makers, our human-verified database covers more than 2,700 active family offices. Download the free sample or see the Full USA Database.