Fractional CFO for Companies Preparing for Acquisition

An acquisition - whether you're the one buying or the one being bought - is the most financially complex event most businesses will face. The stakes are high, the timeline is compressed, the due diligence is intense, and the financial decisions made during the process can affect the outcome by millions of pounds.

Most companies don't have the in-house financial expertise to manage this effectively. A full-time CFO might have done one or two acquisitions in their career. A fractional CFO who specialises in M&A may have done dozens. That experience gap translates into better preparation, smoother due diligence, stronger valuations, and fewer surprises after completion.

fullfraction matches UK companies with fractional CFOs who have specific M&A experience. Here's what that looks like in practice.

If You're Being Acquired (Sell-Side)

Preparation - 6 to 18 Months Before

The companies that achieve the best outcomes in a sale start preparing long before a buyer appears. A fractional CFO's role in this preparation phase is about making your business look (and actually be) as financially attractive as possible.

Financial clean-up is the first priority. This means ensuring your management accounts are accurate, consistent, and professionally presented. Historical figures should be clean, adjustments should be documented, and any unusual items should be explained. Buyers and their advisors will scrutinise every number, and discrepancies erode confidence and value.

Profit optimisation (sometimes called "earnings quality") involves identifying and addressing issues that suppress your reported profitability. Are you running personal expenses through the business? Are there below-market salaries for founders that understate the true cost base? Are there one-off costs that should be normalised? A fractional CFO will produce an adjusted EBITDA that presents your true earnings power.

Revenue quality analysis examines how sustainable and predictable your revenue is. Recurring revenue is valued more highly than one-off revenue. Long contracts are valued more than short ones. A diverse customer base is better than concentration in a few accounts. A fractional CFO will help you understand and improve these factors before going to market.

Working capital normalisation ensures your balance sheet tells an accurate story. Buyers will calculate a normalised working capital level and adjust the purchase price accordingly. If your working capital is unusually high or low at the time of sale, it affects the final number. A fractional CFO manages this proactively.

During the Sale Process

Data room management is one of the most time-consuming aspects of a sale. Buyers request hundreds of documents: financial statements, contracts, customer data, employee information, IP documentation, compliance records. A fractional CFO prepares and manages this data room, ensuring information is presented clearly, questions are answered quickly, and nothing is missing that could delay the process.

Due diligence support is where a fractional CFO's M&A experience is most valuable. Buyer-side accountants and advisors will interrogate your financials in detail. Having someone who has been through this process many times - who knows what they'll ask, what they'll focus on, and how to present information in the most favourable light - is an enormous advantage.

Negotiation support on financial terms. While the overall negotiation is typically led by the founders and their corporate finance advisor, the fractional CFO provides essential input on financial aspects: earn-out structures, completion accounts mechanisms, warranty and indemnity provisions, working capital adjustments, and deferred consideration terms.

Completion accounts are the financial statements prepared at the moment of sale that determine the final purchase price. Getting these right - and having someone who understands the common areas of dispute - can affect the proceeds by hundreds of thousands of pounds.

Post-Completion

Even after the sale completes, there's financial work to do. Earn-out management (if part of the deal), completion accounts finalisation, and the transition of financial systems and reporting to the new owner all benefit from having a capable fractional CFO involved.

If You're Acquiring (Buy-Side)

Target Evaluation

Before you commit to an acquisition, a fractional CFO evaluates the target's financials with a critical eye. They'll assess the quality of earnings (is the reported profit sustainable?), working capital requirements, hidden liabilities, customer concentration risk, and the true cost of integration.

This evaluation goes beyond what a standard due diligence report provides. A fractional CFO applies commercial judgment: does this acquisition actually make financial sense for your business? What are the realistic synergies? What will integration cost?

Financial Due Diligence

While you may engage a specialist due diligence firm (and probably should for acquisitions above £1-2M), a fractional CFO acts as your internal finance lead during the process. They interpret the due diligence findings, identify areas that need deeper investigation, and translate technical financial findings into business implications.

They also prepare the questions and information requests for the seller, manage the flow of information, and ensure nothing falls through the cracks in what can be a fast-moving and information-dense process.

Deal Structuring

The structure of the deal - cash versus deferred consideration, earn-outs, warranties, working capital mechanisms - all have financial implications. A fractional CFO models different scenarios: what happens to your cash flow under various deal structures? What's the true cost of the acquisition including integration? How does it affect your ability to fundraise or invest in organic growth?

Integration Planning

Financial integration is one of the most common areas where acquisitions go wrong. Different accounting systems, chart of accounts, reporting standards, and financial processes need to be harmonised. A fractional CFO plans this integration before completion, so you can hit the ground running from day one.

Post-Acquisition Financial Management

After the acquisition, the fractional CFO manages the combined financial reporting, tracks performance against the acquisition business case, manages any earn-out calculations, and ensures the financial integration stays on track. This is often a more intensive period requiring additional days per week.

Why a Fractional CFO Is Often Better Than a Full-Time Hire for M&A

Acquisitions are events, not permanent conditions. You might spend six to twelve months preparing, three to six months executing, and three to six months integrating. After that, the intensity drops back to normal.

A fractional CFO can flex their involvement to match this pattern - working one day per week during preparation, scaling to three or four days during active due diligence and negotiation, then scaling back down during integration. A full-time hire can't flex this way, and you may not need a full-time CFO outside of the acquisition process.

Additionally, M&A-specialist fractional CFOs bring specific experience that most full-time CFOs don't have. They've seen more transactions, more deal structures, and more due diligence processes. This pattern recognition is genuinely valuable when the stakes are high.

What to Look for in an M&A-Specialist Fractional CFO

Transaction experience is non-negotiable. Ask how many acquisitions or sales they've been involved in, at what size, and on which side (buy or sell). Ideally, they've done both.

Due diligence expertise - both conducting it (buy-side) and surviving it (sell-side). They should be able to describe common due diligence findings and how they've addressed them.

Completion accounts experience is important because this is where significant money is at stake post-deal. The mechanisms are technical and the disputes are common.

Corporate finance network. A fractional CFO who works regularly on M&A will know corporate finance advisors, lawyers, and due diligence firms. These relationships can save you time finding the right advisors for your transaction.

How fullfraction Matches You with M&A-Experienced CFOs

When you tell us you're preparing for or considering an acquisition, we match you specifically with fractional CFOs who have relevant M&A experience. We know which CFOs in our network have buy-side experience, which have sell-side experience, and which have worked on transactions at your scale and in your sector.

Our matching is completely free. Tell us what you need and we'll present options within 48 hours.

Frequently Asked Questions

How early should I bring in a fractional CFO if I'm thinking about selling?

The earlier the better, within reason. Twelve to eighteen months before you want to sell gives enough time to clean up financials, optimise profitability, and present the business in its best light. Six months is workable but leaves less room for improvement. If a buyer has already approached you, bring someone in immediately.

Do I need a fractional CFO if I'm already using a corporate finance advisor?

Yes - they serve different roles. A corporate finance advisor runs the sale process: finding buyers, managing the auction, negotiating the headline deal terms. A fractional CFO manages the financial substance: preparing the data room, supporting due diligence, working on completion accounts, and ensuring the financial story is strong. Most corporate finance advisors expect the company to have its own financial leadership.

How much does a fractional CFO cost for an acquisition process?

Expect to pay £20,000 to £60,000 over the full process (preparation through completion), depending on the complexity and duration. For a transaction worth £5M or more, this is a tiny fraction of the deal value and easily justified by the improvement in process quality and outcome.

Can a fractional CFO help us value the business?

They can provide an indicative valuation and model different scenarios, but for a formal valuation (as required for a sale process), you'll want a corporate finance advisor. The fractional CFO's role is to ensure the underlying financials support the strongest possible valuation, not to produce the valuation itself.

fullfraction is the UK's free matching platform for fractional CFOs. Find your perfect CFO match today.