Setting Up a Family Office: Structure, Costs, Build Sequence

The build-or-buy decision

Establishing a family office is a business decision, not a status symbol. The principal question is whether the cost of building and running a dedicated institution is justified by the complexity of the family's affairs, the volume of decisions requiring coordination, and the value of control and privacy. For most families, that threshold arrives somewhere between $100 million and $200 million in investable assets, but AUM alone is a poor guide. A family with $120 million in liquid assets, no operating businesses, and no cross-border residency may be perfectly well served by a multi-family office (MFO) or a carefully structured private banking mandate. A family with $180 million in assets but several operating companies, three jurisdictions of tax residency, a private aircraft, a yacht, and a philanthropy program will likely find that an MFO cannot provide the depth of coordination required.

Three structural alternatives deserve honest comparison before committing to an SFO. The embedded model, in which a private bank, law firm, or accounting firm provides integrated services under a formal mandate, works well for families whose complexity is primarily financial and whose trust in the incumbent adviser is high. It costs nothing to set up and typically runs 60-120 basis points on assets under advisement, depending on the scope of services. The MFO model, in which the family buys into a shared-cost platform, offers more independence from product sales and more robust operational infrastructure than an embedded arrangement, at comparable or slightly lower all-in cost. The SFO model delivers maximum control, customization, and confidentiality, at the price of fixed overhead, management distraction, and operational risk if key staff depart.

An SFO is justified by complexity and control requirements, not by asset size alone. AUM is a proxy for whether the cost is tolerable; it is not the underlying rationale.

Cost and staffing thresholds by AUM tier

In practice, SFO operating costs decline as a percentage of AUM as assets grow. At the $150-250 million tier, a lean but functional office, meaning a family office director, one investment analyst, a finance and operations manager, and outsourced tax and legal work, will cost approximately $1.5-2.5 million per year in total overhead, including salaries, benefits, office space, technology, and professional fees. On $200 million in AUM, that equates to roughly 75-125 basis points. That figure is meaningfully higher than an MFO mandate, which typically prices at 40-70 basis points all-in at that asset level. The differential narrows sharply above $400 million. A full-function SFO at $500 million, with a chief investment officer, a tax and legal function, family office director, operations staff, and appropriate technology infrastructure, might cost $3.5-5 million annually, or 70-100 basis points, while an MFO at that tier will typically price at 35-55 basis points. The gap remains, but the value of control, customization, and privacy begins to offset it for complex families.

Staffing norms vary by function. Investment oversight at the $250-500 million tier requires at minimum one experienced investment professional capable of managing external manager relationships, conducting due diligence, and producing coherent asset allocation analysis. A dedicated CIO is rarely necessary below $400 million unless the portfolio includes significant private market exposure requiring active monitoring. Tax and legal functions at this tier are almost always best outsourced initially, with in-house counsel and tax professionals added once annual external fees exceed roughly $400,000-600,000, which typically occurs above $600 million in total assets. Operations, reporting, and family administration can often be handled by one or two generalist staff members in the early phases, supported by outsourced accounting and consolidated reporting.

Jurisdiction and entity structure

Entity structure and domicile are foundational decisions that should be resolved before the first operating hire. The choice of jurisdiction affects tax treatment of investment income, employment obligations, regulatory requirements, and the cost of future restructuring. Common SFO domiciles include the Cayman Islands for investment vehicles, with the operating entity in a low-tax or nil-tax jurisdiction such as Singapore, Dubai (DIFC or ADGM), Jersey, or Guernsey. U.S.-based families typically operate through a limited liability company or limited partnership structure in Delaware or Wyoming, with the SFO structured as a registered investment adviser if it manages assets for family members across multiple households, triggering regulatory obligations under the Investment Advisers Act of 1940 and the family office exemption under Dodd-Frank.

Cross-border families face additional layers of complexity. FATCA reporting obligations apply to foreign financial institutions with U.S. beneficial owners, and CRS automatic exchange of information has closed most of the remaining information asymmetries across OECD jurisdictions. Families with operations or holdings generating significant profits in multiple jurisdictions must now plan around BEPS Pillar Two, which establishes a global minimum effective tax rate of 15 percent for large multinational enterprises, including certain family-owned structures above the revenue threshold. Substance requirements in low-tax jurisdictions have tightened materially since 2018; a Cayman or BVI holding structure with no genuine economic activity will struggle to withstand scrutiny from HMRC, the IRS, or EU member-state tax authorities. The practical implication is that the holding and operating structure must be designed by qualified advisers with cross-border expertise before the SFO entity is incorporated, not revised after the fact.

Trustee location and governance entity

The trustee location for any family trust structures should be selected on the basis of legal system quality, political stability, information exchange commitments, and the family's ability to appoint and remove trustees with reasonable practicality. Jersey and Guernsey offer common-law trust frameworks, robust regulatory oversight under the Financial Services (Jersey) Law and equivalent Guernsey legislation, and tax-neutral treatment for non-resident beneficiaries. Singapore's trust framework under the Trust Companies Act has matured considerably and benefits from a strong rule of law. Choosing a trustee jurisdiction primarily to avoid disclosure is a strategy with declining utility given CRS and the growing network of beneficial ownership registers across EU member states.

The four-phase build sequence

A phased approach to building an SFO reduces the risk of over-investing in infrastructure before the operating model is clear. The four phases below reflect a common progression, though the sequencing will vary depending on whether the family's primary complexity is investment, operational, or tax-driven.

Phase one: governance and legal entity formation

Before any staff are hired, the family should complete three foundational tasks: document the family's investment philosophy and governance principles in a written family constitution or charter; establish the legal entity structure for the SFO operating company and any investment holding vehicles; and define the SFO's mandate, including which assets it will oversee, which family members it will serve, and what the decision-making hierarchy will be. This phase should also include the selection of an independent family council or advisory board if appropriate, and agreement on the family office's reporting lines. Families that skip this phase and hire a director first frequently find that the director spends the first 12-18 months attempting to reverse-engineer a governance framework without the authority to do so.

Phase two: investment oversight

The first substantive hire in most SFOs is either a family office director with investment competence or a dedicated investment professional. At this stage, the primary objective is to rationalize the existing portfolio, which is often a legacy accumulation of banking relationships, direct investments, and inherited positions with no coherent allocation framework. This phase involves establishing an investment policy statement, selecting a strategic asset allocation, transitioning custody and reporting to a consolidated structure, and beginning the process of manager due diligence for any active external mandates. The investment function at this stage should be principally one of oversight and manager selection, not direct investment management, unless the family has a specific competitive advantage in a particular asset class.

Phase three: tax, legal, and compliance infrastructure

Once the investment function is operational, attention should turn to the tax and legal infrastructure. This includes completing any entity restructuring identified in phase one, establishing formal processes for FATCA and CRS compliance, reviewing existing trust structures for substance and alignment with current beneficial ownership, and putting in place a legal calendar for regulatory filings, trustee meetings, and family council meetings. At this phase, many families choose to retain a single external law firm and a single external tax adviser on a primary-relationship basis, with specialist firms brought in for specific transactions. The risk of continuing to rely on multiple uncoordinated advisers beyond this phase is significant: conflicting advice, duplicated fees, and gaps in coverage are consistent findings when SFOs conduct their first formal governance reviews.

Phase four: consolidated reporting and full operations

The final phase involves building the operational backbone: consolidated financial reporting across all entities and asset classes, a formal accounting function (in-house or outsourced), an employee handbook and HR framework for SFO staff, insurance coverage for the operating entity and its directors, and a business continuity plan. Consolidated reporting is frequently the most technically demanding element, particularly when the portfolio spans public securities, private equity, real estate, operating businesses, and personal assets. Families should expect 6-12 months of intensive work to achieve genuinely consolidated reporting at institutional quality, regardless of the tools used.

The sequence matters: governance before staff, investment oversight before tax restructuring, and reporting infrastructure before the operating model is considered complete.

Pressure-testing readiness before committing

Before authorizing the formation of an SFO, principals should be able to answer four questions clearly. First, is the complexity of the family's affairs genuinely sufficient to require dedicated institutional infrastructure, or is the desire for an SFO driven by preference rather than necessity? Second, does the family have the governance maturity to act as an informed employer, meaning the capacity to set objectives, conduct performance reviews, and make difficult personnel decisions without the intermediation of a bank or adviser? Third, is the family's privacy requirement strong enough to justify the premium over an MFO, recognizing that employee turnover in small family offices creates disclosure risk of its own? Fourth, is there a principal or family member capable of providing consistent strategic direction to the SFO, without which even well-staffed offices tend to drift?

Families that cannot answer all four questions confidently are not necessarily unready to build an SFO, but they should sequence the work differently: complete the governance and legal formation phase as described above before making operating hires, and consider a transitional arrangement with an MFO or embedded adviser to provide operational continuity while the family's own institutional framework is being constructed. The cost of a poorly sequenced SFO build, measured in staff turnover, restructuring fees, and advisers correcting early-stage errors, typically exceeds the cost of a deliberate, phased approach by a material margin.

Every family's situation is different. The thresholds, structures, and cost benchmarks described here are illustrative starting points. Specific facts, asset types, family circumstances, and applicable jurisdictions will all affect the right answer. Families considering establishing an SFO should obtain qualified legal and tax advice tailored to their specific situation before making any structural commitments.