A new PE-backed CFO gets a clear mandate: build the finance function the value-creation plan needs. Most read "build the function" as "build the team," and start hiring. A controller, a head of FP&A, the org chart filled in over the first two quarters.
It's the obvious move and it's a half-step wrong. The work of the first year and the work of the steady state are different work, and they call for different teams. Size your department against year one and you've built for a phase that ends.
You didn't inherit a broken function. You inherited a calibrated one.
Start with what's actually wrong, because it's usually not what it looks like.
The finance function you walk into rarely is broken. It's calibrated to the last owner. A founder wanted clean tax and a number at month-end. A corporate parent wanted the package its consolidation team asked for. A slower sponsor wanted quarterly rigor and not much more. Whatever the prior standard was, the team was built to deliver it, and by that standard it was doing fine.
PE ownership moves the standard. Now the board wants monthly reporting that holds up to scrutiny. The value-creation plan needs a forward model it can actually run on, not a budget revisited once a year. Tracking the thesis takes a granularity the old chart of accounts never had. There may be carve-out financials to produce or integration accounting to stand up. None of this is a competence problem. The team you have isn't failing at the new standard. It was never asked for it. The gap is calibration, and closing it is a year of build.
Build work is finite, and finance is full of it
Here's the property that makes finance different from most functions you could be standing up.
The hard work of that first year is non-recurring by nature. Building the forward model. Standing up reporting infrastructure. Implementing or replacing the system. Producing carve-out financials. Getting from a slow, messy close to a clean one in five days. Running the first real budget cycle the way the plan needs it run. Every one of those is a project with an end state. You finish it, and what's left is the lighter, repeatable work of running what you built.
That's why the team that builds the function isn't the team that runs it. The build needs deep, specific expertise for a defined stretch: someone who has stood up the model before, who has done the carve-out close, who knows the system. The run needs a steady, smaller group doing the recurring work well. They're different shapes. The reflex to hire permanent against the build sizes you for the heavier shape, the one that disappears once the build is done.
What that costs you
The cost shows up two ways, both on the slow burn.
If you hired ahead of the build, you spend a quarter or more recruiting the specialized people the projects needed, which means the projects start late, which is the one thing a PE-backed finance function can't afford. The reporting the board wanted in month two arrives in month six.
If you hired into the build and kept everyone, you reach steady state carrying a department sized for work that's finished. Now finance is the cost line the board asks about, and you're either justifying headcount you don't need or unwinding a team you spent a year assembling. Neither is the position you want to be defending at the first review where the plan is behind.
Resource the build as a build
The shape that works treats the build as what it is: finite, specialized, project work, resourced separately from the run.
The deep non-recurring work goes to specialists brought in against it. The model build, the systems work, the carve-out financials, the reporting stand-up: these need someone who has done exactly this before, for as long as the project runs and no longer. They deliver the build and leave the function lighter, not heavier.
Where a part of the function needs an owner before you're ready to make the permanent call, an interim leader covers it. A controller seat that has to be run while you decide what the permanent controller looks like. A head of FP&A role you'll hire carefully rather than fast. The work gets owned now, and the permanent decision gets the time it needs.
The permanent hires come last, against the run. Once the build is far enough along that you can see the steady state, you know the actual shape of the team that operates it, and you hire that team against a real picture instead of a guess made in month one. You end up with a function sized for what it does every month, built by people who specialized in the part that only happened once.
The mandate was never to build a big finance team fast. It was to get the function to the standard the plan requires, on the timeline the plan assumes. Those are different jobs, and the team that gets you to the standard is rarely the team you keep once you're there.