Fractional vs. Full-Time CFO After an Acquisition — How to Decide

You've just closed the deal. Day one post-acquisition. The prior CFO has a severance agreement and is out in 60 days. The operating partner is asking the fundamental question: do we find a permanent CFO, or do we put a fractional in place first?

This is one of the highest-stakes talent decisions in private equity — and it's one that's made under time pressure with incomplete information. The wrong answer doesn't just cost money. It costs months of integration momentum, board confidence, and in some cases the trajectory of the entire investment.

Here's the framework I use when I'm advising PE operating partners through this exact decision.

Why the 100-Day Window Is Everything

The 100 days after close are when the real picture of the acquired business comes into focus. Forecasts get stress-tested. Surprises surface. The management team shows you who they actually are under pressure. And critically — the finance function either holds together or it doesn't.

In this window, the CFO role isn't primarily strategic. It's structural. Someone needs to be accountable for the numbers, managing the banking relationship, overseeing the first lender reporting cycle, and giving the board confidence that the financial infrastructure is intact.

That's a specific job. And it's worth asking whether it requires a permanent hire — or whether it's better served by someone who's done it dozens of times and is available immediately.

The Case for Going Fractional First

There are four scenarios where I almost always recommend starting with a fractional CFO:

1. The prior CFO was the finance function

At smaller companies — particularly founder-led businesses acquired by PE for the first time — the CFO often built everything themselves. The processes, the reporting, the relationships. When they leave, they take institutional knowledge that no permanent hire can instantly recover. A fractional CFO who has worked in similar environments can stabilize the function, document what exists, identify gaps, and give the next permanent hire something real to inherit — rather than a crater.

2. You don't yet know what you need

One of the most expensive talent mistakes in PE is defining the CFO profile before you understand the operating reality of the business. You close a deal assuming you need a transformation CFO. Two months later you realize the first priority is a transaction and you actually need someone who's done four or five sale processes. Or vice versa.

A fractional CFO gives you a 60–90 day diagnostic period. By the time you launch the permanent search, you're not guessing at the profile — you know exactly what the business needs.

3. Speed to chair is critical

SIG's average time from kickoff to shortlist is 38 days. The best permanent CFO candidates are typically in active conversations with multiple firms. Even in the fastest-moving search, your permanent hire won't be in the chair for 60–90 days from the moment you kick off the search — and that assumes the first slate produces your candidate. Many searches run longer.

If you need a senior finance leader accountable for the first lender package, the Q3 board deck, or a tuck-in transaction that's already in diligence — you cannot wait. A fractional CFO can be deployed in days.

4. Budget constraints are real

A PE-backed CFO at a $50M–$200M revenue company typically commands a base of $275K–$375K, plus meaningful equity and benefits. In a cash-constrained operating environment — particularly post-close when every dollar matters — a fractional engagement priced at a fraction of that full-time cost may be the right structural decision until the business generates the EBITDA to support a permanent executive compensation package.

The Case for Launching a Permanent Search Immediately

Fractional is not always the answer. There are clear scenarios where the right decision is to move directly to a permanent CFO search — and where delaying that search by introducing an interim layer ends up costing more time, not less.

1. The exit is 18–36 months out and the CFO is central to value creation

If your investment thesis requires a CFO who will professionalize the finance function, build the team, implement a new ERP, and then run a sale process — you cannot afford to have that person arrive 12 months into the hold. Every month without the right CFO is a month the business isn't building the capabilities that support your exit multiple.

In these cases, start the permanent search on Day 1. Use a fractional CFO to keep the lights on while the search runs in parallel — not instead of the search.

2. The business has a complex, high-stakes near-term transaction

Paradoxically, if you're acquiring a company that needs to close a tuck-in acquisition within 90 days, or refinance its credit facility under tight covenants, that specific transaction may require a CFO with real ownership and a long-term stake — not someone on a flexible engagement who may not have the authority or credibility with lenders that a permanent CFO would have.

3. The management team needs a permanent table

Cultural integration is a leadership activity. When the CEO, COO, and other senior leaders are rebuilding trust, establishing norms, and setting direction — an interim finance leader can be a visible signal of instability. In certain operating environments, particularly in businesses where the management team has been through a lot of change, the board and CEO may correctly prioritize the credibility signal of a permanent CFO appointment over the tactical flexibility of a fractional arrangement.

The Decision Matrix

When I sit down with an operating partner to work through this, I run through the following criteria:

The Hybrid Approach: The Right Answer Most of the Time

The question is framed as a binary — fractional or permanent — but the highest-performing PE operating teams have learned that it doesn't have to be.

The approach I see work best in practice:

1. Deploy a fractional CFO on Day 1 post-close. Stabilize the finance function, protect lender relationships, and get honest about what the business actually needs from a permanent hire.
2. Launch the permanent search at 30–45 days post-close, informed by what you now know from the fractional engagement.
3. Target a 90–120 day window for the permanent hire to join, with the fractional CFO providing continuity through onboarding and transition.

This sequence gives you speed (the fractional is in place immediately), quality (the permanent search is informed by real operating knowledge), and optionality (the fractional may become your permanent candidate).

The Conversation You Need to Have Before Close

The biggest mistake I see PE firms make in CFO succession planning isn't the choice between fractional and permanent. It's waiting until 30 days post-close — when the situation is already urgent — to have the conversation at all.

The best operating partners start the CFO succession conversation during diligence. They know the current CFO's severance terms, retention package (or lack thereof), and likelihood of staying. They have a preliminary view on the profile they'll need before they've signed. And they have a search partner lined up so that the moment they have clarity, they can move.

The cost of being reactive is a fractional engagement that runs too long, a permanent search that's rushed, and a management team that's operating without stable financial leadership during the period they need it most.

If you're in the middle of a deal and starting to think about the finance leadership question — this is the right time to have the conversation with a search partner. Not after close.