Inside the quiet private firms that run billionaire money: what they own, what they get wrong, and the free version any household can copy.
This in-depth guide covers everything you need to know about what is a family office? how the very rich run money. Based on verified income data and real-world case studies from our database of 138 side hustle tactics.
A family office is a private company that a wealthy family sets up to manage its own money and run its financial life: investing, tax, legal work, bill paying, succession and often philanthropy. A single family office serves one family, while a multi family office shares one team across several families. US law sets no asset minimum, but banks draw the practical line high: Citi Private Bank says its family office services are only for single family offices with over $100 million in assets.
What a family office actually does all day
Picture a quiet floor in an office building with no sign on the door. A dozen people work there. Some pick fund managers and review private deals. Others reconcile bank statements across six countries, pay the property tax on a ski house, renew the insurance on a painting, and prepare the board pack for a family meeting where three cousins will argue about whether to sell the operating company.
That is a family office. The SEC's own shorthand, in the 2011 release that created the US rule, calls them "entities established by wealthy families to manage their wealth and provide other services to family members" (SEC Release IA-3220).
The investment work gets the headlines, yet a lot of the job is administration. In the UBS Global Family Office Report 2026, non-investment staff (operations, accounting, legal support, lifestyle services) made up 40% of total family office headcount. The same report found that strategic asset allocation, risk management and consolidated financial reporting are usually kept in-house, while legal services, tax planning and cybersecurity are more often outsourced.
How many hours a year do you spend on your own family's paperwork? Most households do a small version of this job already, just without a name for it.
Single family office vs multi family office
The two models solve the same problem at different scales.
| Single family office (SFO) | Multi family office (MFO) | Your household version |
|---|
| Who it serves | One family, often across several generations | Several unrelated families | You, a partner, maybe kids or parents |
| Who owns it | The family | An outside firm or a founding family that opened its doors | You |
| Typical staff | Investment, accounting, legal, admin hires | A shared team; you pay a fee | One person with a spreadsheet and a calendar reminder |
| US regulation | Can fall outside the Investment Advisers Act if it meets the SEC family office rule | Serves outside clients, so it falls outside that exclusion | None |
| Cost | Average $0.9 million to $6.6 million a year depending on size (J.P. Morgan, 2026) | A fee paid to the firm | Close to $0 |
A multi family office often starts life as one family's private office that later takes in other families to share the overhead. The moment it advises a second, unrelated family, it fails the first condition of the SEC rule (no clients other than family clients), so in the US it has to find another way to comply with adviser regulation.
How rich do you need to be: the family office minimum
Nobody hands out a license with a dollar threshold printed on it. The minimums you see quoted come from cost, and from banks deciding who they want to serve.
Here is what the primary sources say, as of 2026:
- Citi Private Bank limits its family office services to single family offices with "over $100 million in AUM." That is a bank's eligibility rule, and it is the cleanest published line you will find.
- UBS surveyed 307 family offices in more than 30 markets for its 2026 report. The families had an average net worth of $2.7 billion, and each office managed an average of $1.3 billion.
- J.P. Morgan Private Bank surveyed 333 family offices in 30 countries for its 2026 Global Family Office Report, with average assets under supervision of $1.2 billion.
- Citi's 2025 survey drew a record 346 family offices from 45 countries, and the leaders at its June 2025 summit had an average family net worth of $3.8 billion.
Notice what these numbers describe. They are averages for the bank's own clients, so they skew high. Plenty of smaller offices exist. What the sources agree on is that a full single family office starts to make sense somewhere in the nine figures, and the typical survey respondent sits in the billions.
What would you need to see in your own numbers before you felt you needed a staff to manage them?
What it costs to run one
J.P. Morgan's 2026 report gives the clearest price list. Average annual operating cost by assets under supervision (J.P. Morgan Private Bank):
| Assets under supervision | Average annual cost | What that is as a share of assets, at the top of the band |
|---|
| $250 million or less | $0.9 million | 0.36% at $250 million (0.9% at $100 million) |
| $250 million to $500 million | $1.7 million | 0.34% at $500 million |
| $501 million to $999 million | $3.3 million | about 0.33% at $1 billion |
| $1 billion and up | $6.6 million | 0.66% at exactly $1 billion, less for larger offices |
The percentage column is simple division on J.P. Morgan's averages, so treat it as a rough guide. It shows why the threshold exists. Most of the cost is fixed, so a small office pays a far larger share of its assets for the same team.
Where does the money go? UBS found that pure operating costs are still the biggest slice, at 53% of family office expenditure, with staffing "clearly the largest factor." Technology spending has been falling as a share.
There is also a regulatory cost history. Before 2011, a US family office that fell outside the old exemption had to ask the SEC for an individual order. The SEC estimated those applications cost a typical family office $200,000 on average in legal fees. The rule described below removed that step for offices that meet its terms.
The SEC family office rule, in plain words
Until 2011, many US family offices avoided registering as investment advisers through the "private adviser" exemption, which covered advisers with fewer than 15 clients that did not hold themselves out to the public. The Dodd-Frank Act repealed that exemption effective July 21, 2011, and in its place created an exclusion for family offices as the SEC would define them (SEC Release IA-3220).
The SEC adopted the definition on June 22, 2011 as Rule 202(a)(11)(G)-1. Under the rule text(11)(G)-1), a family office:
- "Has no clients other than family clients"
- "Is wholly owned by family clients and is exclusively controlled (directly or indirectly) by one or more family members" (or family entities)
- "Does not hold itself out to the public as an investment adviser"
"Family" is wide under the SEC rule. It covers the lineal descendants of a common ancestor, living or dead, plus their spouses, adopted children, stepchildren and foster children, as long as "the common ancestor is no more than 10 generations removed from the youngest generation of family members." Certain key employees can also be clients: executive officers and directors of the office, plus investment staff who have done that kind of work for at least 12 months.
Meet those conditions and the office is outside the Investment Advisers Act. The rule itself sets no asset minimum. A family with $30 million could, in principle, run an office that qualifies.
Why does any of this matter to you? Because it explains why these offices are so quiet. Outside the adviser rules, a single family office does not file the public adviser disclosures a registered firm would.
That quiet has a cost when things go wrong. In April 2022 the SEC charged Bill Hwang and his "family office Archegos Capital Management." According to the SEC, Archegos grew from about $1.5 billion with $10 billion of exposure in March 2020 to more than $36 billion with $160 billion of exposure at its peak a year later. When its most concentrated stocks fell, the SEC alleged, the price drops triggered significant margin calls, and the firm's default and collapse left its trading counterparties with billions of dollars in credit losses.
Singapore and Dubai, in one line each
Singapore was home to more than 2,000 single family offices at the end of 2024, according to MAS deputy chairman Chee Hong Tat (finews.asia), and MAS says those offices "do not need to be regulated" beyond normal company rules because they handle no third-party money (MAS, April 2025). Dubai International Financial Centre says it is home to 1,289 family-related entities, up 61% in a year.
What family offices invest in
This is the part most people are curious about. UBS publishes the average strategic asset allocation of the single family offices it surveys. Here is 2025, from the 2026 report:
| Asset class | Share of the average family office portfolio (2025) |
|---|
| Equities, developed markets | 27% |
| Equities, emerging markets | 5% |
| Fixed income, developed markets | 14% |
| Fixed income, emerging markets | 3% |
| Cash | 9% |
| Private equity, direct deals | 8% |
| Private equity, funds | 9% |
| Real estate | 11% |
| Hedge funds | 6% |
| Private debt | 3% |
| Gold and precious metals | 2% |
| Infrastructure | 1% |
| Commodities | 1% |
| Art and antiques | 1% |
Add up the UBS figures and you get 58% in traditional assets (stocks, bonds, cash) and 42% in alternatives. A few things stand out.
Public stocks are still the biggest single block. Nearly a third of the money sits in listed shares. The glamorous stuff, private deals and art, is a minority.
Private equity is big, and much of it is direct. At 17% combined, private equity is the largest alternative. Citi's 2025 survey found that 70% of respondents were engaged with direct investments, meaning they buy stakes in companies themselves instead of only through funds.
They are changing more than usual. UBS found that 60% of family offices plan to change their strategic allocation in the next 12 months, the highest share the report has recorded. Those planning changes expect to cut real estate from 11% to 8% and nudge gold from 2% to 3%.
Themes. UBS reports that 65% of family offices invest in opportunities across the AI technology stack. Crypto stays small: 24% have some exposure, and among those, allocations are "typically around 1%."
They borrow. UBS found 65% of family offices still use leverage, though less than five years ago. How families borrow against assets is its own topic, covered in buy, borrow, die.
Look back at that table. How different is it from your own split between cash, a retirement account and a home?
What family offices get wrong
It is easy to assume the very rich have this figured out. The surveys say otherwise.
Succession. J.P. Morgan reports that "86% of global family offices do not have clear succession plans in place for decision makers." UBS found only 35% have a succession plan for the family office itself, and just 27% have an organized process to prepare the next generation (UBS 2026).
Written investment rules. Only half of UBS respondents (50%) have a documented investment process including an investment policy statement. In J.P. Morgan's survey, 35% cite a formal investment policy statement.
Governance. Fewer than half of UBS respondents (49%) have a governance framework such as a board with oversight of the office.
So skip the idea that a family office is a magic box that guarantees good decisions. Archegos was a family office. What these structures buy is time, attention and staff. Good judgment still has to come from somewhere.
Also skip the urge to copy the allocation table. Private equity, hedge funds and direct deals at this level come with minimums, lockups and fees built for people with hundreds of millions. A household that chases "what the billionaires own" through high-fee products usually ends up with the costs and none of the access. If you want early-stage exposure on a small scale, read the plain risks first in the angel investing guide.
And skip the leverage. Two thirds of family offices borrow, but they borrow against a large, diversified base with staff watching the ratios. UBS notes that among those using leverage, 51% manage the risk by regularly monitoring leverage ratios. A household with one paycheck has far less room for a margin call.
The family office mindset you can copy for free
Strip away the staff and the office, and a family office does five repeatable things. Each has a free version.
1. One page that says how you invest
The investment policy statement is the document half of these offices skip. CFA Institute's position paper on investment policy statements for individual investors frames it around four areas: investment objectives, performance requirements, risk management and governance.
Your one-page version:
- Goal: What is this money for, and when do you need it? (Retirement in 25 years, a house deposit in 4.)
- Target mix: Your split between stocks, bonds and cash, written as numbers.
- Rebalancing rule: For example, "once a year, or when any part drifts more than 5 points from target."
- What you will not do: No single stock above a set share, no borrowing to invest, no product you cannot explain in one sentence.
- Who decides: You, you and a partner, or you with a fee-only adviser.
Cost: zero. Time: an hour. If you have not picked a simple core yet, the index investing guide explains the simple, cheap core most households use.
Could you write down your target mix right now without looking it up?
2. One consolidated view
Family offices spend real money on consolidated reporting so the family sees every account in one place. Your version is a spreadsheet with one row per account (checking, savings, retirement, brokerage, debts, home equity) and a net worth total. Update it once a quarter.
3. An annual review meeting
UBS found 58% of family offices run an annual budgeting process and 55% run a regular review of all their activities. Put a date in your calendar each year. Bring the one-page statement and the spreadsheet. Ask four questions: Did we stick to the plan? Did anything change in our life? Are fees creeping up? Do beneficiaries and insurance still match reality?
4. A succession plan, small edition
This is where most billionaires fall short, and where you can beat them cheaply. Make sure the accounts have current beneficiaries, a trusted person knows where the documents are, and you have a will. If you are the one receiving money, read what to do with inheritance money for the first steps.
5. Teach the next generation
Only about a quarter of family offices have a structured way to prepare heirs. You can do it at the kitchen table: show a teenager the spreadsheet, explain the one-page plan, let them make one small decision a year. The habits behind lasting family money are covered in old money vs new money, and if building something that outlasts you is the point, retire your bloodline is the longer read.
| Family office practice | What it costs them (2026) | Your copy-it version | Your cost |
|---|
| Investment policy statement | Part of a $0.9 million to $6.6 million annual budget | One-page document | $0 |
| Consolidated reporting | Staff plus outside reporting software | Net worth spreadsheet | $0 |
| Investment committee | Family and outside members, paid advisers | You and a partner, once a year | $0 |
| Succession planning | Lawyers, trustees, family meetings | Will, beneficiaries, a document folder | Varies by state and lawyer |
| Next-generation education | Programs, retreats, internships | A yearly money talk with your kids | $0 |
Surplus comes first
A family office is the end point of a long process, and it starts with surplus: money left over after the bills that has to be put somewhere on purpose. The structure only matters once there is something to manage. If your surplus is small right now, the bigger lever is income, and why salary alone won't make you rich is a good place to start. If you are trying to work out what the target even is, how much money is enough puts a number on it.
What would change in your week if you treated your own money like a small family office with one employee?
Your family office this week
- Day 1: List every account you hold in one spreadsheet, with balances. Add a net worth total.
- Day 2: Write your one-page investment policy statement: goal, target mix, rebalancing rule, three things you will not do.
- Day 3: Check the beneficiaries on every retirement and insurance account.
- Day 4: Put a recurring annual review on the calendar, and invite your partner if you share finances.
- Day 5: Tell one person you trust where your important documents are kept.
Total cost: nothing but an evening or two. That covers the habits that half of the family offices in the UBS survey, by their own answers, still have not put in writing.
Which one will you start tonight?
This article is general information about how family offices work and is not legal, tax or investment advice. Rules differ by country and change over time; for a specific decision, speak to a licensed professional.