A family office with an empty finance seat has three ways to fill it: hire, bridge, or share.
Each has a price. None of the firms that sell the second and third prints one. So the first thing a principal learns is the price of the first, and that number sets the others.
Full-time: the median is $620,000
Morgan Stanley’s 2025 compensation report for single-family offices, built with Botoff Consulting, puts a CFO’s median total compensation at $620,000 a year (InvestmentNews, July 2025). Total compensation: base, bonus and long-term incentive together. The report does not break the figure out by the size of the office, and the median hides a wide range in both directions.
That is the salary. A seat costs more than a salary: employer taxes, benefits, the search fee, and the months it stays empty while the search runs. None of those is in the $620,000.
Interim: $15,000 to $35,000 a month
An interim CFO holds the seat while a search runs, or through a transaction. The Barton Partnership’s 2026 survey of 73 interim CFOs in the US and the UK (The Role of the Interim CFO) found US day rates mostly between $2,000 and $3,000: 38% at $2,000 to $2,500, 24% at $2,500 to $3,000, 13% above $3,000, and 25% at $1,500 to $2,000. At twenty working days, that is $40,000 to $60,000 a month for a full-time interim, and the survey’s respondents are mostly in private-equity-backed companies, not family offices.
A vendor’s own page (EightX, 2026) prices a part-time interim engagement at $15,000 to $35,000 a month, with emergency ninety-day cover at $25,000 to $35,000 and a premium of about 15% to 25% for starting inside two weeks. JRG Partners puts the C-suite interim day rate at $2,500 to $5,000 for 2026, with tier-one cities 20% to 30% above the rest (interim executive rates).
Two things in the Barton survey matter more than the rate. 84% of interim engagements were extended past their original term, and 86% of those extensions were twelve months or shorter. An interim seat is a year, more often than not.
Fractional: $10,000 to $20,000 a month, at the top
A fractional CFO holds the seat a few days a month, for several clients at once. The published guides are written for operating companies, and their figures are a floor for a family: Compass puts a premium retainer (40 to 60 hours a month) at $10,000 to $20,000, a specialist 20% to 35% above a generalist, and a major-metro rate 10% to 15% above the national one. EightX puts the fractional range at $5,000 to $15,000 a month, or $60,000 to $180,000 a year.
A family office is the specialist case: trusts inside holding companies inside trusts, a foundation with a December date, banks that each read a mandate their own way. The top of the fractional range is where that work sits.
The napkin
| The seat | A year | Against the full-time median | What you get |
|---|---|---|---|
| Full-time CFO, median total compensation | $620,000 | 100% | One person, five days a week, in the office. Plus taxes, benefits, the search and the empty months. |
| Interim, part-time (vendor pricing) | $180,000 to $420,000 | 29% to 68% | A year, more often than not; a seat that empties again when the term ends. |
| Fractional, top of the range | $120,000 to $240,000 | 19% to 39% | A few days a month; a generalist unless you pay the specialist premium. |
| The CFO Seat | $180,000 | 29% | A family office CFO by the month, the Controls Check as week one, and a record anyone can check. Any month to leave. |
The percentages are the year’s fee over $620,000, the median total compensation above. They leave out what the median leaves out: taxes, benefits, the search fee and the empty months, which fall on the full-time column alone.
Why the firms do not print a price
On 7 November 2026 we read the family office pages of twenty-two firms that sell this work: multi-family offices, trust companies, the Big Four’s private practices and a dozen accounting firms. Not one carries a fee. The nearest is a frequently-asked answer that fees may be “AUM-based, flat, or a service retainer”, and a pointer to a regulatory filing.
The reason is structural, not secretive. A firm that prices on assets cannot print a number without printing a formula a principal will test. A firm with seven hundred people cannot print one price because the seat is filled by whoever is free. A one-person house can print one price because there is one seat.
Frequently asked
What does a family office CFO earn?
A median of $620,000 a year in total compensation, by the Morgan Stanley and Botoff 2025 survey of single-family offices. The range around that median is wide and the report does not publish it by office size.
What does an interim family office CFO cost?
The published interim figures are for companies, not families: US day rates mostly $2,000 to $3,000 (Barton, 2026), and part-time interim retainers of $15,000 to $35,000 a month on a vendor’s own page (EightX, 2026). No family-office-specific interim survey was found.
Is a fractional CFO enough for a family office?
It depends on what the seat has to do. The four things that go wrong in a family office’s finance function are written up in Note 7, with a test for each; a fractional seat that cannot run those four is a bookkeeper with a title.