When the Family Office Investment Fund Structure Pencils Out

How a well-known structure delivers durable after-tax alpha for families well below the threshold many advisors assume.

For families running institutional-grade investment programs, the largest recurring tax inefficiency is one most never think of looking for. It surfaces only when someone steps back and asks: what is this family paying every year to run the program, and what is the tax code doing about it?

For most families, the answer is: a lot, and nothing.

Investment management fees, family office overhead, and fund-level expenses passing through on private fund K-1s are all non-deductible to individual and trust investors under current law. The 2017 tax law put that deduction on ice, and 2025’s OBBBA legislation made the suspension permanent. A family paying real fees on a real portfolio is funding the entire program with after-tax dollars, year after year, and getting nothing back from the tax system.

There is a well-established solution. It goes by various names: family investment funds, family office fund structure, the “Lender” structure, after the 2017 Tax Court case that put it on the map. Conventional wisdom treats it as a billion-dollar-family tool, and a handful of national law and accounting firms have cornered that end of the market and price accordingly, partly driven by mystique about the architecture. But while the set-up and operations are complicated, the math can work out for families with a low-nine-figure investment program, and the benefits compound over time.

What the structure does

The specifics vary family by family — there is no single template, and that is part of the point. The goal in every version is the same: reposition the family’s investment activity so that the entity running the program is treated as an actual business for tax purposes — often as a C corporation — with operations to match. When that is done well, expenses that would otherwise vanish into nondeductibility become deductible at the entity level. Income is routed to absorb those deductions efficiently and is taxed at a lower rate than the family would face directly. The two pieces work together to reduce the recurring tax drag on the portfolio every year the structure is in place.

The supporting legal and tax architecture (ownership, governance, operating discipline, accounting, and regulatory positioning to preserve the exemption from investment-adviser registration) is rigorous work, but the approach is well understood by sophisticated advisors, and the cost has dropped sharply as the playbook has matured.

Starting at $100 million

Consider the most conservative case: a family with $100 million invested in a tax-efficient, professionally managed public equity portfolio. Low turnover, mostly qualified dividends, plenty of unrealized appreciation. The kind of portfolio where a tax planner has the least to work with.

Assume 35 basis points of subadvisor fees and another 30 basis points of allocable family office overhead — $650,000 a year. Under current law, none of that is deductible.

Inside the structure, those same expenses are run through an entity that can deduct them, paired with offsetting income taxed at a lower rate than the family would face individually. The direct annual tax savings is roughly $150,000: about 15 basis points on the portfolio, every year, without anyone outperforming a benchmark. There is also a compounding benefit: dollars that would otherwise have been taxed each year (whether or not reinvested) remain invested, growing as deferred capital gain, or potentially escaping income tax entirely on a basis step-up.

At $100 million in a straightforward and otherwise tax efficient portfolio, the direct annual savings can cover the structure’s carrying cost, with the compounding benefit providing margin. At $200–300 million on the same fee profile, the direct savings doubles and triples while structural costs barely move, and the structure starts producing at least 20 basis points of durable tax alpha.

Where the math really opens up

The conservative example understates the case. The economics improve substantially as the portfolio shifts toward strategies with heavier fee loads and more current ordinary-character income: hedge funds, fund-of-funds, actively traded vehicles, private credit, and many private equity programs. Institutional programs lean on these strategies for pre-tax alpha and accept the tax drag as the price of admission. The structure changes that calculus.

These are the corners of the portfolio where fees run highest, where pass-through expense structures (now standard at most large multi-strategy hedge funds) can absorb several percentage points of NAV before any net return reaches the investor, and where income is often taxed currently at ordinary rates. Inside the structure, those expenses become deductible, and the offsetting income, which the family would otherwise absorb at top ordinary rates, can be taxed at a lower rate at the family office entity level to the extent it has net income.

For a $200 million family split between tax-efficient equities and a meaningful allocation to fee-heavy alternatives, total annual tax savings can easily clear $700,000. The math can be an order of magnitude better, per dollar invested, than the public-equity baseline, when pre-tax alpha can be enhanced with additional post-tax alpha.

Why the threshold has moved

The view that this structure is reserved for billion-dollar families is anchored in older fee environments and older legal cost structures, before technology and a maturing playbook brought set-up and operating costs down. The math is driven by total cost load and the rates that would otherwise apply to offsetting income. For a family with $150–300 million of investable assets and meaningful exposure to fee-heavy strategies, the comparison between recurring tax savings and the all-in cost of setup and operation clears with plenty of room to spare.

The complexity and risks are real. The structure has to be designed with care and operated with discipline, and it requires experienced advisors at the table from the start. Shortcuts don’t survive scrutiny, and the structure won’t generate deductions on its own — the underlying economics and operations have to be real. But for families at these asset levels, in this tax environment, it is among the highest-value pieces of income tax planning available. SagePoint’s wealth strategy team can run the diagnostic—fees, income character, structure costs, and projected benefit over a multi-year horizon—before a family dives into structural work.