Family Office — United States

The US family office market

The US hosts the world’s largest family office ecosystem. Roughly 3,000–4,000 single-family offices operate domestically, with a multi-family office industry serving thousands more families. The infrastructure, specialized legal, tax, compliance, and investment service providers, is deep in a way no other market matches.

The density creates real optionality. A US family at any scale from $25M to $10B+ can find infrastructure that matches their needs, from lean multi-family office arrangements to large institutional single-family offices with direct investment teams. The optionality is also a trap: the marketing surround-sound pushes families toward building infrastructure earlier and larger than they need.

The continuum for US families

Embedded family office. A longtime CPA or wealth advisor, an executive assistant, and informal coordination. Works well at $20M–$100M for households without operating businesses or multi-generational complexity.

Virtual family office. A handful of trusted specialists coordinated by a generalist (often called a personal CFO or principal advisor). Lower cost than a single-family office; meaningful coordination benefit when the generalist is competent. Typical range $30M–$150M.

Multi-family office (MFO). Shared institutional infrastructure across a handful of client families. The dominant offering in the $50M–$500M range. Major US MFOs include Bessemer, Rockefeller Capital Management, GenSpring, Constellation Wealth Advisors, Pathstone, Cresset, AlTi Tiedemann Global, and many regional players. Pricing typically 25–75 bps of AUM with larger families receiving meaningful discounts.

Outsourced Chief Investment Officer (OCIO). Institutional investment management outsourced to a specialized provider. Hirtle Callaghan, Strategic Investment Group, and similar providers. Often combined with a small in-house operational team to cover non-investment functions.

Single-family office (SFO). Dedicated internal team. Typically makes sense at $250M+ with genuine complexity (operating businesses, international presence, multi-generational structures). Below $250M, the SFO cost structure rarely competes with a good MFO.

Hybrid SFO. The emerging dominant model for larger US families. Internal team for governance, coordination, and family-specific functions; outsourced CIO for investment management; external providers for specialized needs. Addresses the difficulty of hiring and retaining top investment talent inside a single family context.

What sits inside a US family office

The functions follow a predictable set:

Investment management. Whether in-house, OCIO, or MFO-delivered. Portfolio construction, manager selection, alternative investment sourcing and due diligence, direct deal participation.

Tax coordination. Preparation typically outsourced; strategy is where family offices earn their fees. Federal income, federal estate and gift, state tax planning, entity structure coordination, trust income tax management. For US families, the coordination between multiple tax regimes (federal, state, trust, entity) is where most leakage occurs without active management.

Trust and estate administration. Funding irrevocable trusts, administering distributions, coordinating trustees. US families frequently have multiple trusts in multiple jurisdictions, the administrative burden is real and scales with complexity.

Entity administration. Family LLCs, partnerships, holding companies, and operating businesses require ongoing tax compliance, bookkeeping, and governance support.

Concierge and lifestyle. Travel, properties, household staff, personal services. Some family offices embed this; others explicitly keep it separate to preserve clean professional boundaries.

Governance support. Family meetings, next-generation education, dispute resolution. The largest US family offices invest heavily here; smaller ones often don’t and subsequently wish they had.

Philanthropic administration. Private foundation operation, DAF management, grantmaking support.

Security and privacy. Coordination with physical and digital security providers.

Health and wellness. For some families, coordinated healthcare, concierge medicine, and wellness services.

US-specific structural choices

State of formation and operation. Single-family offices are typically formed in low-tax, business-friendly states. Wyoming, Nevada, Delaware, and South Dakota are common. Operating location (where the staff actually works) can be different from legal domicile.

Entity structure. The family office itself is often an LLC or corporation. The specific structure affects tax treatment of the office’s operating income and the deductibility of operating expenses against the family’s taxable income.

§162 vs. §212 deductibility. A 2017 Tax Court case (Lender Management) clarified that certain single-family office structures can qualify as “businesses” under §162, allowing full deduction of operating expenses. §212 (investment activities) deductions were eliminated for individuals by the TCJA. The case created a planning path for families to structure the office as a bona fide business serving multiple family entities, preserving deductibility of what would otherwise be non-deductible.

Trust company vs. non-trust-company structure. Families of sufficient scale increasingly form private trust companies (PTCs) in favorable jurisdictions (South Dakota, New Hampshire, Wyoming). The PTC serves as trustee for family trusts, providing continuity, confidentiality, and control over trustee succession that commercial trusteeships don’t offer.

Operating business integration. Families with active operating businesses often embed certain family office functions within the business’s finance and legal infrastructure. Clean when deliberate (with clear cost allocation and governance); messy when it evolves by default.

Economics for US SFOs

Small SFO (~$100M AUM). Operating cost typically 50–100+ bps of AUM. A $100M SFO at 75 bps is $750k per year. Hard to justify vs. an MFO for most families at this scale.

Mid-sized SFO ($250M–$750M AUM). Operating cost typically 40–70 bps of AUM. A $500M SFO at 50 bps is $2.5M per year. Starts to make sense when the family’s complexity genuinely exceeds what an MFO can deliver cleanly.

Large SFO ($1B+ AUM). Operating cost typically 25–50 bps of AUM. A $2B SFO at 35 bps is $7M per year. At this scale, the cost is typically justified by the combination of complexity, deal flow, and governance value.

The hidden cost. The operating budget doesn’t include the principal’s time and attention running the institution. Employing people, managing interpersonal dynamics, handling compensation questions, dealing with turnover. For principals who built operating businesses, this is familiar. For those who explicitly restructured their life to escape running operating businesses, the SFO often becomes the thing they didn’t want.

Tax-specific coordination US family offices should deliver

State residency and trust situs alignment. The family’s residency state, trust situs, and business state should be deliberately aligned. A California-resident family with Florida-situs trusts and a New York-headquartered business faces specific coordination complexity. Good family offices run this as an ongoing discipline.

GST allocation tracking. Generation-skipping transfer tax exemption allocation across multiple trusts and funding events. Easily mismanaged; hard to fix after the fact.

Multi-generation QSBS planning. Coordinated stacking of §1202 exclusion across family members, with documentation and timing alignment.

Basis and step-up planning. Tracking basis in appreciated assets, with deliberate decisions about which assets to hold for step-up at death versus sell during life.

Trust income tax optimization. Taxable income at trust level can face compressed brackets (37% at just $15,200 of undistributed income). Deliberate decisions about distribution vs. retention, plus situs selection for state tax.

Year-end planning coordination. The calendar year is the unit of tax planning in the US. Year-end coordination, charitable gifting, loss harvesting, estimated payments, specific elections, is an annual choreography that good family offices run tightly.

Common US family office failure modes

Building too early. A $50M family hiring a CIO and a controller, paying $750k+ in operating cost to run a portfolio that an MFO would manage competently for $250k. Most commonly driven by the principal’s desire for control; frequently reversed within five years.

§162 deductibility mishandling. A family office structure that doesn’t qualify for §162 treatment, leaving substantial operating expenses non-deductible. A significant leakage that proper structural work prevents.

Staff retention failure. Losing a CIO or senior administrator mid-tenure. Institutional memory is concentrated in few people; replacement is disruptive. Compensation and tenure planning for key roles is material.

Unclear separation from operating business. Family office staff and operating business staff blend roles without clear cost allocation. Creates transfer pricing issues (if the operating business subsidizes the family) and governance friction.

Trust situs not aligned with family office location. Trusts administered in high-tax states that could have been sitused in South Dakota, Nevada, or Delaware for better tax and legal treatment.

Next-generation not integrated. Office serves the principal generation exclusively. When the principal withdraws or dies, the next generation inherits an institution they don’t know how to run and doesn’t match their preferences.

Overbuilt investment infrastructure. The office hires an investment team that marks performance slightly below what the MFO alternative would have delivered, at meaningfully higher cost. Common at the $200M–$500M range.

Advanced patterns

Private trust company in SD/NH/WY. For families of sufficient scale, a family-owned PTC provides the most control over trusteeship. Requires specific state licensing and formation work; becomes transformative at the right scale.

Direct deal platforms. Larger SFOs build internal direct investment capability. Sourcing, evaluating, and making direct private investments. Works when the family has operating background and sustained deal flow; underperforms when it’s theater.

Shared family offices. A few ultra-large families formally combine infrastructure. Rare, legally complex, occasionally very efficient.

Private foundation operation. Larger family offices operate the private foundation as an embedded function. Requires attention to self-dealing rules and clean separation between foundation and family activities.

Captive insurance coordination. Some families use family-owned captive insurance for operating business risk or legitimate family-level insurable risks. Specialized; properly structured captives remain defensible; abusive micro-captives have been heavily challenged.

Next-generation education programs. Formal programs for heirs, financial literacy, fiduciary responsibility, governance practice. The most effective US family offices at multi-generational scale run these as core functions rather than afterthoughts.

Where to go deeper

TIGER 21 and Long Angle surface candid conversations on family office decisions. For US-specific family office discussions, organizations like Family Office Exchange (FOX) and the Institute for Private Investors host regular programming for principals and family office executives. The honest version of most family office decisions is available in peer settings and rarely in the advisory marketing. See also Tax Strategy, US for the tax coordination the office should deliver and Estate Planning, US for trust situs and governance architecture.