What Is a Multi-Family Office? Services, Costs, and Who Should Consider One

A multi-family office (MFO) is a firm that provides comprehensive wealth management to a select group of wealthy families, combining investment management, financial planning, tax strategy, estate coordination, and administrative services under one coordinated team. By industry estimates, families typically consider an MFO from roughly $25 million to $50 million in investable assets, with fees often around 0.40% to 0.70% of assets under management. The model gives families much of the depth of a private family office at a fraction of the cost of building one themselves.

The rest of this article explains what those services actually involve, what they cost, how an MFO differs from a traditional wealth manager, and how to decide whether one fits your situation.

Where did the multi-family office model come from?

The family office concept began with single-family offices: private staffs created by industrial-era families to manage their investments, taxes, property, and philanthropy. A single-family office serves exactly one family and is owned by that family.

The multi-family office emerged when some of those offices, and later independent firms, began serving several families at once. Sharing a professional team across families spreads the cost of expertise that no single family below a very high asset level could justify hiring on its own. Today the term covers a range of firms, from converted single-family offices to boutique registered investment advisers built from the start to serve multiple households.

What unites legitimate MFOs is scope. The job is not limited to managing a portfolio. It is overseeing a family's entire financial life, the way a chief financial officer oversees a company.

What services does a multi-family office provide?

Service menus differ by firm, but a full-service MFO typically coordinates work across six broad areas.

Investment management.This includes setting an asset allocation tied to the family's goals, selecting and monitoring managers or building portfolios directly, managing concentrated positions, evaluating alternative investments, and reporting performance across all accounts and entities, not just the ones the firm manages.

Financial and cash flow planning.MFOs model long-range spending, liquidity needs, education funding, large purchases, and the sustainability of the family's lifestyle across generations. The plan, not a product, drives the investment work.

Tax strategy and coordination.Most MFOs do not prepare tax returns, but they design the strategy a CPA executes: asset location, gain and loss management, charitable timing, entity structuring, and multi-year income planning. The MFO's job is to make sure investment, estate, and tax decisions are made together rather than in separate silos.

Estate and wealth transfer coordination.This covers working with estate attorneys on trusts and gifting strategies, tracking exemption use, keeping beneficiary designations and titling consistent with the documents, and administering the structures after they are created. With the federal estate and gift exemption at $15 million per person ($30 million per married couple) in 2026 under the One Big Beautiful Bill Act, families above those levels still face a meaningful transfer tax problem that requires ongoing management.

Family office administration.Bill pay, bookkeeping across entities, consolidated reporting, insurance reviews, document management, and coordination of household and property matters. These are unglamorous tasks, but they are where errors and fraud most often hide when no one owns them.

Family governance and education.Many MFOs facilitate family meetings, help draft family mission statements or governance documents, and educate the next generation about stewardship before heirs inherit responsibility.

A useful test of any firm calling itself a multi-family office is whether it actually delivers across most of these areas, or whether it is an investment manager with a family office label.

How is a multi-family office different from a wealth manager?

The line can blur, because good wealth managers also plan and coordinate. The differences are mostly matters of depth, scope, and structure.

Scope of responsibility.A typical wealth management relationship centers on the assets the firm manages. An MFO takes responsibility for the family's full balance sheet, including outside assets, operating businesses, real estate, trusts, and entities it does not directly manage.

Coordination role.An MFO acts as the hub among the family's CPA, estate attorney, insurance specialists, and bankers, convening them and tracking execution. In a traditional model, the family itself usually carries that coordination burden, and tasks fall through the gaps between professionals.

Administration.Few wealth managers handle bill pay, multi-entity bookkeeping, or consolidated reporting across custodians. For complex families, this administrative layer is often the most immediately felt difference.

Client load.MFOs generally serve far fewer families per professional than large brokerage or bank platforms, which is what makes the depth of service possible.

Structure also matters. Many MFOs, including Atlatl Advisers, are independent, fee-only registered investment advisers, which means they are fiduciaries compensated only by their clients rather than by commissions or product revenue. That is not universal across firms using the family office label, so it is worth verifying on a firm's Form ADV.

What does a multi-family office cost?

By industry estimates, MFO fees often run roughly 0.40% to 0.70% of assets under management, frequently with tiered schedules that decline as assets grow. Some firms instead charge flat annual retainers, project fees, or a combination, particularly for administrative and consulting work that does not scale with portfolio size.

Three comparisons put that range in context.

First, against a single-family office: industry estimates put the annual operating cost of a dedicated single-family office at $1 million or more, often roughly 1% to 2% of assets, which is why that route generally makes sense only above $100 million or so.

Second, against fragmented advice: a family separately paying an investment manager, a planning firm, and hourly professionals for uncoordinated work may pay a similar or higher all-in percentage while still doing the coordination themselves.

Third, against headline advisory fees alone: an MFO quote typically covers planning, tax strategy, estate coordination, and administration, not just portfolio management. When comparing fees across firms, compare what is included, not just the percentage.

Always ask for the full fee schedule in writing and read the firm's Form ADV Part 2, which registered advisers must file with the SEC and which discloses fees and conflicts.

Who should consider a multi-family office?

Asset level is the usual starting point, and industry convention puts the MFO conversation at roughly $25 million to $50 million and above. But complexity is often the better signal than the number itself. Entry points vary by firm, and some boutique MFOs work with families below those levels when the situation warrants it.

An MFO tends to fit when several of the following are true:

• Wealth is spread across multiple entities, trusts, properties, or custodians, and no one sees the whole picture.
• A liquidity event has occurred or is coming: a business sale, an IPO, a large inheritance.
• The family's CPA, attorney, and investment manager rarely talk to each other, and the family is the messenger.
• Significant estate tax exposure exists above the $15 million per person exemption, requiring multi-year transfer planning.
• The family wants to prepare children or grandchildren to handle wealth responsibly.
• The administrative load of the family's financial life has become a part-time job for someone in the family.

Conversely, a family with a single brokerage account, a simple estate, and a salary-driven balance sheet usually does not need this model and should not pay for it.

A hypothetical example: what coordination looks like in practice

Consider a hypothetical family with $40 million in investable assets after selling a business: $30 million in a taxable portfolio, $6 million in retirement accounts, and $4 million in cash, plus two homes and three trusts created during the sale.

At a 0.50% blended fee, the family would pay an MFO roughly $200,000 per year. In a representative year, the work might include: rebuilding the portfolio around the family's spending needs and tax position; harvesting losses and managing gains in coordination with the CPA before year-end; funding annual exclusion gifts and tracking lifetime exemption use against the couple's $30 million combined exemption with the estate attorney; consolidating reporting across nine accounts and three entities; reviewing property and liability insurance; and running a family meeting to introduce the adult children to the structures that now exist for their benefit.

The family could buy each piece separately. What the MFO model is designed to provide is a single accountable team making sure the pieces fit together and nothing is missed. This example is hypothetical and for illustration only; fees and services vary by firm and situation.

Key numbers

What are the drawbacks of a multi-family office?

The model is not right for everyone, and an honest assessment should include its limits.

Cost relative to simple needs.A family with an uncomplicated balance sheet can often meet its needs with a capable planning-oriented adviser at a lower fee, or with hourly professionals. Paying for coordination a family does not need is waste.

Shared, not dedicated, staff.Unlike a single-family office, an MFO team serves multiple families. Good firms manage this with deliberately low client loads, but a family wanting employees who answer only to them will eventually outgrow the model.

Wide variation under one label.The term multi-family office is not regulated, so service depth, conflicts, and economics vary enormously from firm to firm. Some are fee-only fiduciaries; others are distribution channels for in-house products. The label tells you little; the Form ADV and the service agreement tell you more.

Switching costs.Because an MFO touches so much of a family's financial life, changing firms later is more involved than moving a brokerage account. That argues for careful diligence up front rather than avoiding the model.

How do you evaluate a specific multi-family office?

Start with structure: confirm the firm is an SEC-registered investment adviser acting as a fiduciary, and ask whether it is fee-only or also earns commissions or product revenue. Read the Form ADV Part 2 and the Form CRS.

Then test depth. Ask who, specifically, will handle tax strategy, estate coordination, and administration, and what those people's credentials are. Ask how many families each lead adviser serves. Ask for a sample consolidated report and a description of a typical annual service calendar. Ask how the firm is paid on every product and account, including cash.

Finally, test fit. An MFO relationship often spans decades and generations, so succession at the firm, continuity of the team, and cultural fit with your family matter as much as the service list.

Frequently asked questions

What is the minimum to join a multi-family office?There is no fixed rule. Industry estimates put the typical consideration range at roughly $25 million to $50 million in investable assets, but minimums vary widely by firm, and complexity matters as much as asset level.

Is a multi-family office a fiduciary?Many MFOs are SEC-registered investment advisers, which owe clients a fiduciary duty under the Investment Advisers Act. Confirm the specific firm's registration and compensation model on its Form ADV before assuming this.

Does a multi-family office replace my CPA and estate attorney?Usually not. Most MFOs coordinate and quarterback those specialists rather than replace them, designing strategy and making sure execution happens across the team.

How are multi-family office fees charged?Most commonly as a percentage of assets under management, often roughly 0.40% to 0.70% by industry estimates, sometimes combined with or replaced by flat retainers for planning and administrative work.

What is the difference between a multi-family office and a single-family office?A single-family office is a private company serving one family, typically viable above $100 million in assets. A multi-family office serves several families with a shared professional team, providing similar scope at a much lower cost.

Can a multi-family office work with my existing advisers?Yes. A core function of the model is coordinating the professionals a family already trusts, including CPAs, attorneys, and bankers, while filling gaps in the team.