The question comes up constantly at Series A and B companies: do we hire someone full-time or bring in fractional support? The honest answer is that either can work. What determines the right call is usually the candidate pool and what the role actually needs to be.
That said, there's a pattern worth understanding before you start interviewing.
The experience gap is real
A fractional FP&A person with ten years of experience working 20 hours a week will often outperform a junior full-time hire working 40. You get more output, faster execution, and judgment that comes from having seen the same problems at multiple companies. The price point can be surprisingly similar when you factor in salary, benefits, and the ramp time that every junior hire requires.
This isn't an argument against full-time hiring. It's an argument for being honest about what experience level you actually need and what you're likely to get in the market at your budget.
Where fractional works best
Fractional FP&A is particularly well-suited for three situations. The first is part-time coverage, where the workload doesn't justify a full seat but the expertise is genuinely needed. The second is project-based work — a model build, a fundraise, a board package overhaul — where you need senior skills for a defined period. The third is capability gaps, where your existing team is solid but missing something specific, like someone who can own scenario planning or build out a headcount model.
In each of these cases, you're buying expertise you couldn't otherwise afford full-time, applied exactly where you need it.
Where full-time makes more sense
If the role is genuinely full-time and you need someone embedded in the business day to day, fractional has real limits. A fractional person isn't in your Slack at 9pm when the CEO has a question. They're not in the Monday leadership meeting unless you've structured it that way. Presence and availability matter for certain roles, and it's worth being clear-eyed about whether yours is one of them.
There's also a team-building dimension. If you're trying to hire and develop analysts, a full-time leader is almost always better. Fractional FP&A works well as an individual contributor or as a senior advisor. It's harder to run a team on a fractional basis.
The candidate factor
One thing that gets underweighted in this decision is the quality of the specific candidates in front of you. Sometimes you meet a fractional person who is so clearly the right fit that the question answers itself. The same is true on the full-time side.
The frameworks matter, but so does the person. The best version of either arrangement depends heavily on who's actually doing the work.
How to think about it
Start with the job. Write down what you actually need done in the first 90 days. If that list is 20 hours a week of senior work, fractional probably covers it. If it's 40 hours of embedded operational work, you likely need someone full-time. The role definition should drive the structure, not the other way around.
If you're still not sure, a short fractional engagement is a reasonable way to find out. You learn a lot about what you actually need by experiencing what it's like to have senior finance support, even part-time.