The complete guide to family offices

A family office is a private organization that manages a wealthy family's financial life: investments, taxes, estate plans, record-keeping, philanthropy, and household operations. In asset management, the term refers to both a single-family office set up to manage a single family’s wealth and a multi-family office designed to serve several families.

Key takeaways

• A single-family office (SFO) serves one family (the family that set it up), while a multi-family office (MFO) typically serves a select number of ultra-high-net-worth families.
• There were roughly 8,030 single-family offices globally in 2024, and projections estimate 10,720 worldwide by 2030.
• Core family office services include investment management, tax coordination, estate plan coordination, consolidated reporting, bill pay, philanthropy, and household operations.
• A dedicated single-family office is usually a several-hundred-million-dollar undertaking; the offices in J.P. Morgan's 2026 survey oversee $1.1 billion on average. Multi-family offices serve ultra-high-net-worth families well below that level and many above it.

Where the family office model came from

John D. Rockefeller created the first family office in recorded history in 1882 to manage his family's wealth, philanthropy, and affairs as a dedicated operation. Industrial families copied the model through the twentieth century, and some of those family offices eventually began serving families beyond their own, which is where the multi-family office comes from.

Few families used the model for most of the next century. In the 1980s, more families adopted it as global wealth creation, deregulation, and a long bull market produced more fortunes large enough to need one. The tech startup and venture boom of the 2010s added another generation of founders, and today family offices hold nearly $10 trillion in combined (SFO + MFO) assets.

What does a family office do?

A family office typically aims to preserve, grow, and transfer wealth across multiple generations. How a family office achieves this can look different for every family; however, most family offices offer the following services:

• Investment management. Setting the family's investment policy, allocating across asset classes, selecting managers, and reporting results against the family's stated objectives.
• Tax coordination. Deciding which accounts and entities should hold which assets, timing investments, exits, and exchanges around tax consequences, and working with the family’s CPAs before transactions rather than after.
• Estate and trust coordination. Keeping the estate plan current with the family’s attorney as regulations and family circumstances change, coordinating trust distributions and trust tax filings with the trustee and CPA, and bringing the next generation into meetings before they inherit their family’s wealth.
• Consolidated reporting. Producing one report that brings together the accounts, entities, and holdings the family shares with the office, and updating it.
• Household and administrative management. Coordinating bill pay, cash flow management, insurance reviews and renewals, and payroll for household staff.
• Philanthropy. Structuring giving through foundations or donor-advised funds, administering the grants and the filings that come with them, and involving the next generation in the family's giving.

Wealthy families can buy each of these services separately, whereas a family office provides family office services as one coordinated whole, with one team responsible for all of them.

Single-family offices versus multi-family offices

Single-family office

A single-family office is established by the same wealthy family it serves. The family hires the office’s staff, owns the entity, and bears the full operating costs. As of 2024, an estimated 8,030 single-family offices exist globally, a count that has grown substantially over the past decade as global wealth has increased.

Certain ultra-wealthy families are drawn to the single-family office model for its control and privacy benefits. However, single-family offices carry substantial operating costs, and more and more families that built one have since closed or shrunk it, citing cost, staffing, and the work of running what amounts to a small company.

Multi-family office

A multi-family office, by contrast, can deliver the same scope of work through a registered firm that serves a limited number of families. Under this model, wealthy families get access to institutional-grade services at a fraction of the cost of building a family office themselves, since multiple families share the firm's costs.

This shared model can be an ideal middle ground for families that need an investment team to work in step with their CPA, estate attorney, and other advisors to manage their complex financial lives without bearing the cost of a full-time staff.

Family office vs. wealth management: which is a better fit for you? compares the two models and the conventional advisory relationship in detail.

How much wealth should you have to start a family office?

Families that build their own office generally hold several hundred million dollars or more; advisers who help set them up put the practical starting point near $500 million. A key consideration is the office’s total operating cost. Across 333 offices surveyed in 2026, offices above $1 billion spent $6.6 million. Operating costs typically have a minimum floor, as all single-family offices require the staff and systems to manage the firm; as a family’s asset base grows, family offices can benefit from economies of scale.

Multi-family offices set their own minimums, typically far lower, because the systems and team already exist and families share them. Many ultra-high-net-worth families engage a multi-family office before their wealth would justify a dedicated office often around a major liquidity event, like selling their business or an IPO.

How much money you need for a family office depends on operating costs, fees, and minimums.

A family whose assets are spread across operating businesses, trusts, and several states has more coordination needs than a family with a larger balance held in a single investment account.

How does the SEC treat family offices?

The SEC's family office rule, adopted in 2011 under the Dodd-Frank Act, excludes a single-family office from the definition of an investment adviser when it serves one family and takes no outside clients. In this case, the office may advise only family clients, the family must wholly own and control it, and it may not portray itself to the public as an investment adviser.

A family evaluating a multi-family office can read the firm’s filings on the SEC's adviser search before any meeting to review its services, fee structure, and the assets it oversees.

How are family offices staffed?

Family offices employ their own professionals for investment, reporting, and administrative work; some larger single-family offices also keep tax and legal staff in-house, while most, and multi-family offices generally, work with the family’s outside CPAs and attorneys instead. Most offices build these teams around a chief investment officer, a chief financial officer, and increasingly a chief technology officer, and look for people with both the technical experience and the temperament to work closely with a family.

Candidates with the strongest institutional experience are not always the right fit for the client service a family office requires. Setting up a family office: build one or partner with one walks through the full build and the alternative.

What working with a family office looks like

The family office team manages investments, coordinates with the family’s CPA and estate attorney, keeps trusts and entities in order, coordinates bill payment, and reports on it all together, so the family can work with one group of people who see how the pieces all fit together.

A family office that is paid only by the family does not earn commissions on investment products, so its advice is not tied to selling them. A family evaluating a multi-family office can confirm how the firm is paid in its Form ADV before engaging it.

When families start working with a family office, they often notice the change in how they spend their time. The office takes on the administrative load, and meetings with the team focus on the family’s plans for the years ahead.

Questions families ask

Do family offices have to register with the SEC?

A single-family office serving one family under the family office rule does not. A multi-family office does: it registers as an investment adviser, files a public Form ADV, and owes clients a fiduciary duty.

How many family offices are there?

An estimated 8,030 single-family offices existed globally in 2024, and projections put the count at 10,720 by 2030. That count excludes multi-family offices, which are advisory firms rather than family-owned entities; counting both, the total is estimated at over 20,000 firms.

Is a multi-family office a fiduciary?

A multi-family office registered as an investment adviser owes its clients a fiduciary duty under the Advisers Act: the firm must put client interests first and disclose conflicts. The firm’s public filings describe how the firm is paid. A firm that earns commissions must also be registered as a broker-dealer, and Form ADV shows whether it is; a fee-only adviser is paid only by its clients. Yale Capital's FAQs cover custody, fees, and minimums.

What does a family office cost?

Across 333 family offices surveyed in 2026, the average office spent about $3 million a year; 11% spent more than $7 million. The firms with the lowest operating costs are generally smaller family offices, as certain costs increase with a larger asset base. How much money you need for a family office covers the full economics.

Yale Capital Corp provides family office services to ultra-high-net-worth families, including multi-generational families who want one team accountable for coordinating the whole picture. A conversation about whether the model fits your situation is confidential and costs nothing.