Interim CFO services put an experienced CFO into an empty finance seat, at full scope and on short notice, for as long as the gap lasts. The work is the same work the last person was doing. The close runs, the forecast holds, the bank and the board keep getting answers, and whatever process was already in motion keeps moving. What is different is the clock: an interim engagement starts in days rather than months, and it is built to end.
That last clause is the one people underestimate. Most of what goes wrong in a CFO vacancy is not the missing analysis. It is that nobody is holding the calendar, and the deadlines do not care that the seat is empty. Payroll still runs, the audit still has a date, the covenant certificate is still due on the fifteenth, and the knowledge that lived in one person’s head walked out with them.
What an interim CFO actually covers
Interim CFO, temporary CFO and CFO coverage all describe the same arrangement. Scope should be everything the seat owned, not a subset chosen for convenience.
The reporting calendar
The monthly close, the management pack, the board or investor report, and every filing and certificate with a date attached. First job is to find out what exists and what has quietly slipped.
Cash
A rolling thirteen-week view, built the way agencies actually get paid: retainer timing, pass-through media and production, and client payment behavior. In a vacancy this is where the surprises live.
The budget and the reforecast
Whatever plan the business is running against, kept honest. If the model left with the CFO, rebuilding it is part of the job rather than a change order.
Lenders, investors and the audit
Covenant compliance, borrowing base certificates, the bank relationship, and the auditors who were mid-fieldwork when the seat went empty. These relationships degrade fast without a named counterpart.
The finance team
Someone has to run the people who report into the seat. An interim CFO who only does analysis and leaves the team unmanaged is covering half the role.
Whatever is already in flight
A raise, a sale, a partner buyout, a systems migration, an acquisition being integrated. These are the situations that make a vacancy urgent rather than inconvenient.
When an agency needs interim CFO services
Five situations account for nearly all of them. They differ in how much warning you get, which is mostly what determines how bad the first month is.
The CFO resigned, and the close is in flight
The most common and the most disruptive. Notice periods rarely align with the reporting calendar, so the gap usually opens mid-cycle with reconciliations half done and nobody who knows which schedules were still manual.
Something is already on the table
A raise, a sale, a lender renewal or an acquisition being integrated. These processes have external counterparties and fixed dates, and a finance function without a leader reads to a buyer or a bank as a diligence risk. This is the single strongest case for moving in days rather than weeks.
Medical or parental leave
The one you can plan for, and the one most often underplanned. A bounded absence still needs full coverage, and backfilling it with the controller means the close and the strategy both get half a person.
The search is going to take longer than the business can wait
A CFO-level search plus a notice period is commonly four to seven months. Interim coverage stops that window from being a hole, and it has a second benefit: after ninety days in the seat, you can write a job spec that describes the role you actually have.
The seat was never really filled
A controller or an office manager has been absorbing CFO work for two years and the business has outgrown it. Sometimes the honest answer here is not interim at all. It is an ongoing fractional CFO, because there was never a full-time seat to cover.
What a good interim CFO produces by day fourteen
This is the part worth judging a provider on, because it is specific and it is checkable. In an agency, the list looks like this.
A cash position you can trust, and thirteen weeks forward
Not a bank balance. A forecast that separates your money from money passing through you, because an agency carrying media spend can look solvent while holding cash that belongs to a vendor.
The pass-through exposure, named
What has been committed to media and production partners, what has been billed to clients, and the timing gap between the two. If the agency is paying vendors before clients pay the agency, it is financing its clients, and a vacancy is when that becomes visible.
The state of the close, honestly
Which accounts are reconciled, which are being plugged, and which schedules only worked because one person maintained them by hand. The answer here decides whether the next close is a report or a rescue.
Every date the business owes somebody
Lender certificates, tax filings, audit deliverables, insurance renewals, board meetings. A single list with owners. In most vacancies this document does not exist anywhere, which is precisely why deadlines get missed.
Client and project margin, at least directionally
Revenue net of pass-throughs, by client, against what your people actually cost. It rarely takes two weeks to see which accounts are carrying the business and which are quietly being subsidized.
A written read on what is actually broken
Separating the emergency from the chronic condition. Most agencies discover the vacancy was not the problem, it was the thing that stopped the problem being ignored.
Interim, fractional and outsourced
Three labels, one underlying service, and a genuine difference in shape that is worth getting right before you sign.
Interim is coverage. A seat that should be full is empty, the hours are heavy, and there is an end condition: the permanent hire starts, the leave ends, the deal closes. Fractional is an ongoing arrangement for a business that needs CFO judgment regularly and CFO hours rarely, with no end date assumed. Outsourced describes only where the person sits, which is off your payroll, and applies equally to both.
The practical consequence is what happens after the emergency. A surprising number of agencies hire an interim CFO, get through the gap, run the permanent search, and then realize the business never justified a $300K seat in the first place. The interim engagement converts to a part-time one and the search gets cancelled. That is a good outcome, and it is much easier to reach with a provider who can do both. The longer comparison is in outsourced CFO vs. fractional CFO, and the seat-level version is in fractional controller vs. fractional CFO.
One more distinction matters in practice. If the vacancy is at the controller level rather than the CFO level, cover it with a fractional controller and do not pay CFO rates for reconciliations. If both seats are empty, fill the controller seat first. A CFO working from books nobody has closed produces confident answers to the wrong questions.
Why a generalist interim costs you the first month
In an ongoing engagement, a ramp-up period is survivable. In an interim one it is most of the engagement, which makes industry fit less optional than it sounds.
Agency economics are unusual in ways that change the first two weeks of work. Gross billings are not revenue, so any analysis built on the top line is wrong before it starts. Pass-through media and production distort both margin and cash. Project work carries WIP and revenue recognition questions that a retainer business does not have. Utilization against capacity is the operating constraint, and it does not appear on a standard P&L at all.
The mix shifts by shop as well. An advertising agency placing media has a different exposure profile than a PR and communications firm on straight retainers, or a creative agency billing project work. A generalist interim CFO will get there eventually. Eventually is a quarter, and in a six-month engagement that is half of it spent learning the business on your clock.
What interim CFO services cost
Start with what the whole function should cost rather than with the proposal in front of you, because the proposal only prices one piece of it.
Nearly all agencies spend 2 to 6 percent of net revenue on finance personnel each month. That counts everything human: internal salaries, plus outsourced bookkeeping, controller and CFO support. Software sits on top. Work out your own number before you read anybody’s fee, because it turns the question from “is this expensive” into “where does this land against what we were already spending on the seat that is now empty.”
Interim carries heavier hours than a steady-state engagement by definition, since it covers a full seat rather than a slice of one. Expect it to sit above an ongoing arrangement while it lasts and to come back down when the permanent hire starts or the engagement converts. What should not change is the mechanism. We agree on a monthly budget and scope, then work to it, with no hourly surprises. The budget is at your discretion and can be modified on request, and there is no overage clause because there is nothing to overage. We don’t work past an authorized budget.
Two things are worth asking any interim provider about pricing. First, whether the rate is a single senior rate applied to all hours, because a great deal of interim work is reconstruction rather than judgment and does not need a CFO doing it. Every engagement here pairs a CFO with at least one analyst, which is why the blended rate on most engagements lands below $150 an hour. Second, what happens when the engagement ends, because an exit that requires renegotiation is not really an exit. The full pricing math is in how much a fractional CFO costs.
The handoff is the deliverable
An interim engagement is judged on what the next person inherits, not on what happened during it. Agree the exit at the start, when it costs nothing to be specific.
A documented close
The calendar, the reconciliations, the schedules and who owns each one. If the interim CFO leaves and the close gets hard again, the engagement fixed nothing.
A model the next person can actually drive
Built to be handed over rather than built to be indispensable. Assumptions visible, inputs separated from logic, no hidden tabs.
Reporting that survives the transition
The management pack and the operating dashboard running on their own, so the numbers keep arriving during the gap between one CFO leaving and the next one getting their bearings. This is what the Hub exists for.
A job spec written from the seat
Ninety days in the role produces a far better description of what you need than an org chart does. If you are running the search alongside the coverage, our recruiting team works from that spec rather than a generic one.
A named end condition
“Until the permanent CFO completes their first close” is an end condition. “Until things settle down” is not. Write the first kind.
Interim CFO services FAQ
What is an interim CFO?
An interim CFO is an experienced CFO who steps into a vacant or temporarily empty finance seat and runs it at full scope until the gap closes. They own the same work the departing CFO owned: the monthly close, the forecast, cash, lender and board reporting, and whatever transaction or deadline is already in motion. The distinguishing feature is not the scope. It is that the engagement starts quickly and is designed to end.
What do interim CFO services include?
Full ownership of the finance function for the duration. That means the close and the reporting calendar, a cash forecast you can act on, the annual budget and reforecast, covenant and lender compliance, board or investor reporting, management of the existing finance team, and any live process such as a raise, an audit or an acquisition. A good interim engagement also produces documentation the permanent hire inherits, which is the part most providers skip.
How quickly can an interim CFO start?
One to two weeks is realistic for a firm that already has senior bench capacity. Same-week starts happen when the trigger is a resignation mid-close or a lender deadline. Be skeptical of a provider who promises a start date before they have seen your trial balance, and equally skeptical of one who needs a month. The first is guessing at scope and the second does not have the bench.
What is the difference between an interim CFO and a fractional CFO?
An interim CFO covers a seat that should be full and currently is not, usually at heavier hours, with a defined end. A fractional CFO is an ongoing arrangement for a business that needs CFO-level judgment regularly and CFO-level hours rarely, with no end date assumed. Many agencies start with an interim engagement to stop the bleeding and convert to a fractional one once the emergency is over, because the second is what they actually needed.
How long does an interim CFO engagement last?
Three to nine months covers most of them. A leave of absence is bounded by the leave. A vacancy lasts as long as the search plus the new hire’s notice period, which is usually four to seven months for a CFO-level role. A transaction runs until it closes. If an interim engagement passes a year without a named end condition, it is no longer interim and should be repriced as something else.
How much do interim CFO services cost?
Price the whole finance function rather than the invoice. Nearly all agencies spend 2 to 6 percent of net revenue on finance personnel each month, counting internal salaries plus outsourced bookkeeping, controller and CFO support. An interim engagement carries heavier hours than an ongoing fractional one because it covers a full seat, so it sits above a steady-state engagement while it lasts and comes back down when the permanent hire starts. The mechanism should be an authorized monthly budget and scope you can change, not an open hourly meter.
Is a temporary CFO the same as an interim CFO?
Yes. Temporary CFO, interim CFO and CFO coverage all describe the same arrangement, and the label tells you nothing useful. What varies between providers is seniority, how fast they can actually start, whether a controller and analyst bench sits behind the CFO, and whether the engagement is built to hand off cleanly or to quietly become permanent.
The bottom line
Interim CFO services are worth buying when a seat is empty and the calendar is not. The things that decide whether the engagement works are how fast the start actually is, whether the person in the chair has run agency finance before, and whether the exit was defined on day one or left to be negotiated later. Get those three right and a vacancy becomes a gap rather than a setback. It is also, more often than agencies expect, the moment you find out what the seat should have looked like all along.