Structuring a family office is a different exercise than deciding whether to build one at all. Once that decision is made, the question shifts from "do we need this" to "what should this actually look like" — and that's where most guidance available online stops short. Most published resources describe family office structures in general terms (an entity, a team, some governance) without giving families a way to decide between the real options in front of them.
This guide walks through the three layers of structure that matter — legal, organizational, and governance — and how they interact with the financial infrastructure decisions that ultimately determine whether the structure works day to day.
The 3 layers of family office structure
A family office structure isn't one decision. It's three, made roughly in this order:
Legal and service model — is this a single-family office, a multi-family office relationship, an outsourced/embedded model, or some hybrid of these?
Organizational structure — which roles are needed, which sit in-house, and which are outsourced?
Governance structure — who has decision rights, how disputes get resolved, and how the family interfaces with the operating team?
Families that treat these as one decision tend to under-build (assuming a fully staffed office is the only option) or over-build (hiring a team before the entity count justifies it). Treating them separately makes each decision easier to reason through on its own terms.
Choose a legal and service model first
There are four structural models most families choose between, and the right one depends less on net worth and more on entity complexity and how much control the family wants over day-to-day operations.
Single-family office (SFO). A dedicated structure — typically a management company or LLC — that serves one family exclusively. This gives full control over staffing, systems, and reporting, but concentrates the fixed cost of infrastructure and headcount onto one family's balance sheet. It tends to make sense once a family is managing enough entities, intercompany activity, or illiquid holdings that a shared or outsourced model can't keep pace.
Multi-family office (MFO). An independent firm that serves several families, spreading the cost of staff and infrastructure across multiple clients. This trades some customization and control for lower fixed cost, and it's often the right model for families that need family-office-level reporting rigor without the entity count to justify a dedicated team.
Outsourced or embedded model. Rather than building a standalone entity, some families embed family office functions — accounting, bill pay, reporting — into an existing operating business or work with a fractional controller and outside CPA firm. This is common in the early stages, and it's often the right call for families who are managing family-office-level complexity but aren't ready to commit to permanent headcount.
Hybrid model. Many single-family offices are hybrids in practice: a small in-house team (often a controller or CFO) supported by outsourced bookkeeping, an external CPA firm, and an outside investment advisor. This is the most common real-world structure for offices in the $50 million to $500 million range, where full in-house staffing isn't yet justified but a shared MFO relationship doesn't offer enough customization.
None of these models are permanent. Families frequently start outsourced or embedded, move into a hybrid model as entity count and intercompany activity grow, and only build a fully staffed SFO once the coordination burden justifies it.
Structure the legal entity layer
The legal and service model determines how the family office operates; the entity structure determines what it operates as. Most family offices are built around:
A management company (typically an LLC or S-corp) that employs staff, holds contracts with vendors and advisors, and charges a management fee to the underlying entities it serves.
The underlying entities themselves — trusts, holding companies, operating businesses, and investment vehicles — which the management company services but does not necessarily own.
This separation matters for liability, tax treatment, and clarity of purpose: the management company is a service provider to the family's wealth, not a holding vehicle for it. Families sometimes skip this separation and run family office functions directly out of a holding entity, which tends to create tax and liability complications as the number of underlying entities grows.
Two structural decisions to make early:
Will the management company charge a market-rate management fee to underlying entities, which has tax and documentation implications, or will it be funded directly by family capital without a fee structure? Family office fee structure decisions like this should be made with tax counsel, not assumed by default.
Will one management company serve all family entities, or will the structure need multiple service entities — for example, if different branches of the family have different ownership or control preferences?
Design the organizational and staffing structure
Once the legal and service model is set, the staffing structure follows from it. There's no fixed team size that applies to every family office — it depends on entity count, asset mix, and how much is outsourced — but most offices converge on a similar set of functions, whether staffed in-house or contracted out:
Leadership — a CEO, president, or family office director who sets strategy and manages the team
Investment function — a CIO or investment team managing the portfolio, or an outside advisor relationship if this is outsourced
Finance and accounting — a controller or CFO overseeing bookkeeping, reporting, and consolidation across entities
Operations and administration — bill pay, HR, and vendor management, often combined with the finance function in smaller offices
Tax and estate — typically an outside CPA firm and estate counsel, even in offices that staff most other functions internally
Smaller offices frequently combine several of these into one or two roles — a single controller handling both accounting and operations, for instance — while offices managing dozens of entities separate them into distinct positions with clear reporting lines. The staffing and continuity question — what happens if the person holding this function leaves — is worth revisiting as the structure scales, since informal arrangements that work with two or three entities become a single point of failure at ten or more.
Build the governance structure around the team
Governance is the layer that determines how decisions actually get made once the legal and staffing structure exists. A family office can be perfectly structured on paper and still function poorly if governance is unclear. The core governance components most family offices need:
A family council or equivalent body — the group of family members (often across generations) who set overall direction and review major decisions, distinct from the operating team that executes them
An investment committee — which may include family members, the internal investment team, and outside advisors, with clearly defined authority over allocation decisions
Decision rights and approval thresholds — who can approve what, at what dollar threshold, without going back to the family council
A conflict resolution process — particularly important in multi-generational structures, where family members may disagree on risk tolerance, liquidity needs, or philanthropic priorities
Governance structures that work well tend to separate strategic decisions (made by the family) from operational execution (handled by staff), with clear, written escalation paths between the two. Families that skip formal governance often find that informal decision-making works fine with one generation in charge and breaks down once a second generation is involved.
Where accounting and financial infrastructure fit into the structure
The legal, staffing, and governance decisions above set the shape of the family office. The accounting and reporting infrastructure is what makes that shape functional day to day — and it's worth treating as its own structural layer rather than an afterthought once the entity and staffing decisions are made.
At minimum, the accounting structure needs to mirror the legal entity structure, support consolidation across entities with different ownership percentages, and produce the reporting each governance body actually needs (the investment committee needs different output than the family council). This is a large enough topic that it deserves its own detailed treatment — see how to build the operational and financial infrastructure for a family office for the general ledger, banking, and month-end close decisions that follow once the structure above is in place.
Purpose-built platforms like SumIt's single-family office and multi-family office tools are designed to support this layer directly — mapping the accounting structure to the legal entity structure, handling inter-entity and partnership accounting, and producing consolidated reporting across whichever legal and staffing model a family lands on.
Common structuring mistakes
A few patterns show up repeatedly across family offices that end up restructuring within a few years:
Building full in-house staffing before entity complexity justifies it, which creates fixed cost without a corresponding operational need
Mixing the management company and a holding entity, creating avoidable tax and liability exposure
Skipping formal governance until a disagreement forces the issue, usually across a generational transition
Choosing a general ledger and accounting structure last, after the legal and staffing decisions are finalized, when it's cheaper and easier to design the accounting structure alongside the legal one from the start
Frequently asked questions about family office structure
What are the main types of family office structures? The four most common are a single-family office (a dedicated structure serving one family), a multi-family office (a shared structure serving several families), an outsourced or embedded model (functions handled by an outside firm or fractional staff), and hybrid models that combine a small in-house team with outsourced functions.
How are family offices structured legally? Most are built around a management company — typically an LLC or S-corp — that employs staff and contracts with vendors, separate from the trusts, holding companies, and operating entities that make up the family's underlying wealth. The management company services those entities; it generally doesn't own them.
How does a family office fee structure work? Where a management company exists, it typically charges the underlying entities a management fee for the services it provides, which has tax and documentation implications that should be structured with tax counsel. Some families instead fund the management company directly from family capital without a formal fee arrangement.
Do family offices need a formal governance structure? Not necessarily on day one, but most benefit from one before a second generation becomes actively involved. A family council for strategic direction, an investment committee for allocation decisions, and clear decision-rights thresholds are the most common components.
Getting the structure right the first time
The legal, staffing, and governance decisions above are easier to make well from the start than to unwind later, particularly once entities, staff, and historical records are built around a structure that no longer fits. The accounting and reporting layer is the part of this structure that's the most expensive to retrofit — and the easiest to get right early if it's designed alongside the legal and staffing decisions rather than after them.
SumIt builds multi-entity accounting software purpose-built for the structure family offices actually run — single-family, multi-family, and everything hybrid in between. See how SumIt supports multi-entity consolidation and reporting across whatever structure fits your family.
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