To structure a family office, you form a family-owned legal entity (most often an LLC, limited partnership, or C-corporation), choose a tax posture that fits how your operating expenses will be treated, qualify for the SEC’s family office exemption so you avoid investment adviser registration, and build a governance layer that ties the office to your trusts and estate plan. Industry practice treats roughly $100 million in investable assets as the point where a standalone office justifies its cost. The decisions you make at formation drive your annual tax bill, your regulatory obligations, and how cleanly wealth moves to the next generation.
Decisions to Make Before You File
Structural choices follow from three questions. First, what assets will the office actually manage? Inventory liquid securities, private equity stakes, real estate, closely held businesses, collectibles, intellectual property, and every existing trust, foundation, and custodial account, along with the trustees and executors already in place.
Second, who counts as a client? An office serving a married couple and their children looks nothing like one serving siblings, cousins, and in-laws across several branches. The breadth of that client base determines whether you can qualify for the SEC family office exemption and shapes the size of the legal and compliance team you will need to maintain it.
Third, what is the office for? Wealth preservation, growth, philanthropy, and lifestyle management compete for staff and capital. A written mission statement that ranks these priorities keeps decisions consistent when new generations join and bring different goals.
Choosing the Legal Entity
Three entity types dominate: the limited liability company, the limited partnership, and the C-corporation.
Limited Liability Company
The LLC is the most common choice because it pairs personal liability protection with flexible management. Members can be taxed as a partnership, with income flowing through to individual returns, or elect corporate taxation if that becomes advantageous. Formation requires filing articles of organization and drafting an operating agreement covering member rights, voting, distributions, and buyouts. Not every state requires an operating agreement, but running a family office without one invites internal disputes and unclear authority.
Limited Partnership
A limited partnership separates control from passive ownership. General partners run the office and carry unlimited personal liability; limited partners hold economic interests without management rights. This suits families where senior members want to retain decisions while shifting economic value to younger generations. The partnership agreement sets profit allocation, liability limits, and exit terms.
C-Corporation
A C-corporation is a standalone taxpayer, separate from the family that owns it. It faces double taxation: the corporation pays tax on its earnings, and shareholders pay again on dividends. In exchange, it can deduct a broader set of fringe benefits (health insurance, retirement contributions, educational assistance) and puts a clean wall between the office’s finances and personal returns. As explained below, the permanent loss of individual investment-expense deductions has made the C-corporation math more attractive than it used to be.
Where to Form
Jurisdiction matters. Delaware is a frequent choice because its Court of Chancery, staffed by judges rather than juries, has produced decades of predictable corporate case law that resolves internal disputes quickly.1State of Delaware. Litigation in the Delaware Court of Chancery and the Delaware Supreme Court Nevada offers stronger privacy and no state corporate income tax. Wyoming has low fees and strong charging-order protection for LLC members. The choice affects filing costs, annual maintenance, and the case law available if a dispute reaches court.
Tax Posture for 2026
Entity selection and tax planning cannot be separated, and one change under the One Big Beautiful Bill Act (signed July 4, 2025) has reshaped the analysis.
Pass-Through Versus Corporate
LLCs and limited partnerships are typically pass-through entities: income flows to each member’s return and the entity itself pays no federal income tax. That avoids double taxation, but all income is taxed at individual rates, which reach 37 percent at the top bracket. C-corporations pay a flat 21 percent federal rate on their income, with dividends taxed again to shareholders at capital gains rates.
The Permanent Loss of Investment Expense Deductions
Before 2018, individuals could deduct investment management fees and other income-production expenses under Section 212 as miscellaneous itemized deductions. The Tax Cuts and Jobs Act suspended those deductions through 2025. The One Big Beautiful Bill Act made the suspension permanent, so individuals and pass-through owners can no longer deduct family office operating expenses, including advisory fees, portfolio management costs, and administrative overhead, on their personal returns.2Internal Revenue Service. One Big Beautiful Bill Provisions
The structural consequence is direct: a C-corporation family office can deduct its operating expenses at the entity level as ordinary business expenses, while a pass-through structure cannot pass those deductions to individual members. Families with high operating costs should model both structures with a tax advisor to see which produces lower total tax over time.
Qualified Business Income Deduction
The Section 199A deduction has allowed pass-through owners to deduct up to 20 percent of qualified business income. Its availability significantly affects the pass-through-versus-corporate math, and its current status should be confirmed with tax counsel before you commit to a structure.3Internal Revenue Service. Qualified Business Income Deduction
Qualifying for the SEC Family Office Exemption
The Investment Advisers Act of 1940 makes it unlawful, in general, for any investment adviser to operate without SEC registration.4Office of the Law Revision Counsel. 15 USC 80b-3 – Registration of Investment Advisers Registration means Form ADV filings, books and records, disclosure brochures, and SEC examinations.5U.S. Securities and Exchange Commission. How To Register as an Investment Adviser A properly structured family office avoids all of that by qualifying for the exemption at 17 CFR ยง 275.202(a)(11)(G)-1, which requires three things:6eCFR. 17 CFR 275.202(a)(11)(G)-1 Family Offices
- The office provides investment advice only to “family clients,” a term defined broadly to include current and former family members, key employees, trusts funded by family clients, charitable organizations funded entirely by family clients, and entities wholly owned by family clients.
- The office is wholly owned by family clients and controlled, directly or indirectly, exclusively by family members or family entities.
- The office does not hold itself out to the public as an investment adviser.
“Family member” covers all lineal descendants of a common ancestor (including adopted, step, and foster children), their spouses and spousal equivalents, and the common ancestor’s own spouse or spousal equivalent. The common ancestor cannot be more than ten generations removed from the youngest generation of family members.6eCFR. 17 CFR 275.202(a)(11)(G)-1 Family Offices
If the office takes on a non-family client or lets someone outside the family acquire ownership, it can lose the exemption and be pushed into full registration. The rule provides a narrow grace period: when a non-family person becomes a client through an involuntary event such as a death, that person is treated as a family client for one year after the transfer of assets is complete.6eCFR. 17 CFR 275.202(a)(11)(G)-1 Family Offices Regular internal audits of the ownership roster and client list catch eligibility issues before they become enforcement problems.
Separately, FinCEN’s rule bringing investment advisers into the anti-money-laundering regime is now scheduled to take effect January 1, 2028.7Financial Crimes Enforcement Network. FinCEN Issues Final Rule to Postpone Effective Date of Investment Adviser Rule to 2028 Build recordkeeping systems now that can support AML reporting if it eventually reaches your office.
Governance and Officers
The exemption depends on family ownership and control, but daily operation still needs a professional structure that prevents any one person, family or not, from making unchecked decisions.
A board of directors or board of managers sits at the top. It approves major commitments, hires and removes senior officers, and keeps the office aligned with the family’s mission. One or two independent outside advisors on the board check groupthink and manage conflicts among family members. Below the board, three senior roles cover daily operations: a Chief Executive Officer who runs administration and coordinates across departments, a Chief Investment Officer who sets and executes strategy and manages external fund relationships, and a Chief Financial Officer who handles financial reporting, tax compliance, cash management, and audit prep. An investment committee drawn from board members and officers handles specific capital allocation decisions and monitors performance.
The operating agreement or bylaws should set voting thresholds for major decisions, define each officer’s authority, require dual signatures for transfers above a set dollar amount, and cover leadership succession on retirement, death, or incapacity. Include a dispute resolution mechanism, whether mediation, arbitration, or a family council.
Attracting outside investment talent usually requires more than a base salary. Common tools include co-investment rights alongside the family, phantom equity that tracks office value without granting actual ownership, and carried interest on private equity or real estate. Any incentive plan needs tax and employment counsel review to handle deferred compensation rules and, critically, to make sure the arrangement does not create an ownership interest that breaks the family office exemption.
Integrating the Office with Trusts and Estate Planning
For most families, wealth management and estate planning are the same project. The federal estate and gift tax exemption for 2026 is $15,000,000 per person, up from $13,990,000 in 2025, letting a married couple shelter up to $30,000,000. Amounts above that face rates as high as 40 percent.8Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
A dynasty trust is an irrevocable trust designed to hold assets for multiple generations without triggering estate or generation-skipping transfer taxes each time wealth passes down. The family office can serve as investment manager for these trusts, keeping strategy consistent across personal portfolios and trust holdings. Funding a dynasty trust while the exemption is high locks in the tax benefit even if the exemption later drops.
Some families form a private trust company, a corporate entity that acts as trustee for all family trusts. A private trust company has perpetual life (avoiding the disruption of an individual trustee’s death or incapacity), centralized governance through a family-selected board, and more investment flexibility than a commercial corporate trustee would typically permit. Its board decisions are generally reviewed under the deferential business judgment rule rather than the stricter prudent investor standard applied to individual trustees. This option works best in a state with favorable private trust company legislation, such as South Dakota, Wyoming, or Nevada.
Filing Steps to Formalize the Office
Once the entity, governance, and estate integration are settled, formation follows a predictable sequence.
File articles of organization (LLC) or articles of incorporation (corporation) with the Secretary of State in your chosen jurisdiction. Delaware charges $110 for an LLC certificate of formation; other states range from under $100 to several hundred dollars. Most filings can be done online, with processing from same-day to several weeks depending on the state and whether you pay for expedited handling.
After the state recognizes the entity, apply for an Employer Identification Number from the IRS. The free online application at irs.gov issues the EIN immediately.9Internal Revenue Service. Employer Identification Number Form SS-4 can also be submitted by fax or mail with longer turnarounds.10Internal Revenue Service. About Form SS-4 – Application for Employer Identification Number The IRS recommends forming the entity with your state first, because applying for an EIN before the state recognizes the entity can delay processing.11Internal Revenue Service. Get an Employer Identification Number
Before operations begin, execute employment agreements for senior officers and management contracts with outside advisors. These should cover compensation, confidentiality, non-compete and non-solicitation terms, termination procedures, and the scope of authority. Have the board approve each agreement in a recorded resolution.
Open bank and brokerage accounts in the entity’s name. Financial institutions will want the filed formation documents, the EIN confirmation, and the operating agreement or bylaws to verify signing authority.12U.S. Small Business Administration. Open a Business Bank Account Once accounts are open, you can move assets from personal accounts, existing trusts, and other holdings into the office’s framework.
Most states then require annual or biennial reports to keep the entity in good standing. Fees range from nothing in a few states to several hundred dollars elsewhere, and some states add franchise taxes. Missing a filing can trigger administrative dissolution, so put these deadlines in the office’s compliance calendar from day one.
Insurance and Risk Coverage
A family office faces liability from investment losses, employment disputes, data breaches, and governance failures that personal umbrella policies do not adequately cover. A dedicated program typically includes directors and officers liability (for claims of mismanagement or breach of fiduciary duty against board members and officers), errors and omissions coverage (for professional mistakes in advice, tax planning, or administration), employment practices liability (for wrongful termination, discrimination, or harassment claims), fiduciary liability (for employee benefit plan and trust asset claims), and cyber liability (for breach response, regulatory fines, and third-party claims). Use a broker who specializes in financial institutions or family offices rather than a generic business package.
Cybersecurity for a Concentrated Target
A family office consolidates unusually sensitive financial and personal data in one place, which makes it a high-value target. On the technical side, encrypt data in transit and at rest, require multifactor authentication for every user (including outside attorneys and accountants), and use role-based access controls so each person sees only what their role requires. Revoke credentials the moment a staff member or advisor leaves. For payments, set thresholds that trigger dual authorization and use fraud detection software that verifies amount and recipient before funds move.
On the administrative side, run annual risk assessments using both internal staff and independent third-party firms. Maintain a written incident response plan identifying who to notify, how to contain a breach, and what regulatory reporting applies. Keep client data and electronic vault contents with a single vetted technology provider, with regular backups. The threat landscape shifts constantly, and the office’s defenses have to shift with it.