The signed letter of intent is always the beginning, never the end. For business owners who have spent years building a company, an M&A transaction can feel like the moment everything finally comes together. In reality, the months that follow the LOI are often the most financially demanding stretch the company will ever face. Diligence requests multiply. Every line item on the balance sheet gets scrutinized. Day-to-day operations still need to run, and the team needs reassurance that the business will remain stable through the process.
This is the environment where financial leadership earns its value. Companies that navigate mergers and acquisitions well almost always have one thing in common. They have a senior financial executive who can hold the operating business steady while managing the transaction in parallel. When that executive is not in place, or when the existing CFO is stretched beyond capacity, the cracks show up quickly and they tend to show up at the worst possible moments.
Here is what financial stability looks like during an M&A transaction, and how companies can build it before, during, and after the deal.
Why M&A Transactions Create Financial Turbulence
Even a well-structured deal introduces financial complexity that most operating companies are not built to absorb. The source of the turbulence is almost always the same. A transaction requires a level of financial transparency, responsiveness, and strategic thinking that goes beyond normal business operations, and it requires it for a sustained period of time.
Diligence alone can consume hundreds of hours of finance team capacity. Buyers request historical financials going back three to five years, customer concentration data, debt schedules, working capital analyses, quality of earnings reports, and dozens of other documents that most companies have never had to produce in a single coordinated package. Every inconsistency in the underlying records has to be explained. Every adjustment has to be documented. The ask is relentless, and the finance team still has to close the monthly books and support the operating business at the same time.
Meanwhile, the leadership team is navigating conversations about valuation, deal structure, post-close integration, and employee retention. Decisions made during this period have consequences that last for years, and they often need to be made with incomplete information under significant time pressure.
The companies that come through a transaction with the business still healthy on the other side are the ones that recognized the magnitude of the workload early and put the right financial leadership in place to handle it.
The CFO’s Role Before, During, and After a Deal
Thinking about an M&A transaction as a single event is a common mistake. It is better understood as three distinct phases, each with its own financial leadership demands.
Before the deal. Preparation is where most value is created or destroyed. In the 12 to 18 months leading up to a planned exit, a strong financial leader is cleaning up the books, normalizing EBITDA, documenting revenue recognition policies, organizing contracts and agreements, and building the financial narrative that will support the valuation. This is also the period when companies identify and address the issues that would otherwise surface during diligence, from customer concentration risks to messy intercompany transactions to gaps in internal controls.
During the deal. Once a buyer or investor is engaged, the role shifts. The finance function becomes a project management operation, responding to diligence requests, coordinating with legal and advisory teams, and ensuring that every data point presented aligns with the underlying records. At the same time, the CFO is running scenarios on deal structure, tax implications, working capital adjustments, and post-close financial impact. The operating business still needs a financial leader, which means the function has to deliver on two fronts at once.
After the deal. The work does not end at close. Post-close integration is where many transactions quietly fail to deliver the value that looked so compelling in the LOI. Chart of accounts have to be aligned. Reporting cadences have to be standardized. Teams have to be integrated. Financial systems have to be consolidated or connected. All of this requires senior financial leadership focused specifically on integration while the operating business continues to evolve.
Protecting Financial Accuracy Through Due Diligence
Due diligence is where poorly prepared companies lose valuation and well-prepared companies build buyer confidence. The difference between the two outcomes is rarely about the underlying business. It is almost always about how the financial data is assembled, presented, and defended.
Protecting accuracy through diligence starts with a disciplined data room. Every document shared with the buyer should reconcile to the audited or reviewed financial statements. Every adjustment to historical performance should be supported by documentation. Every projection should have clearly stated assumptions that can be stress-tested in a Q&A session without the CFO having to scramble for context.
The quality of earnings report is often a pivotal moment. This is the deep financial analysis, typically conducted by the buyer’s advisory team, that examines the real economic performance of the business by stripping out one-time items, normalizing owner compensation, and adjusting for any accounting practices that do not reflect sustainable operations. Companies that prepare their own quality of earnings analysis before engaging a buyer typically enter diligence with more credibility and fewer surprises.
Working capital is another frequent flashpoint. Buyers want to ensure they are acquiring a business with sufficient working capital to operate on day one, and the working capital target built into the deal can swing materially based on how accurately the company has tracked accounts receivable, accounts payable, and inventory over time. A finance team that cannot defend its working capital numbers is a finance team that is about to see the deal value reduced.
A fractional CFO with M&A experience brings the muscle memory of having seen these dynamics before. They know which diligence requests will come, in what order, and how to prepare responses that build rather than erode buyer confidence.
Managing Team Morale and Operational Continuity
One of the most underappreciated aspects of M&A transactions is the human impact. Employees notice when the finance team is working around the clock on mysterious projects. Rumors spread. Productivity dips. Key team members, especially in the finance function itself, become flight risks at exactly the moment the company needs them most.
Maintaining operational continuity starts with clear communication about the work that people can see, while respecting the confidentiality the transaction requires. It continues with retention planning for the employees whose departure would materially affect the deal or the post-close business. And it requires a leadership presence that stays visible and engaged with the operating business even as the transaction consumes more and more executive attention.
This is an area where fractional or interim CFO support can make a significant difference. When the existing CFO is fully absorbed by the transaction, a fractional Partner can either take over the operating finance function to free the CFO for deal work, or step in to run the deal work itself so the CFO can stay focused on the business. Either model keeps both tracks moving, and both tracks matter.
At Rankin McKenzie, Partners have seen this pattern repeatedly across industries and deal sizes. The flexibility of the engagement model means the right level of support can be calibrated to the specific demands of the transaction, from a few dedicated hours per week to full interim leadership during the most intense phases.
Why Interim CFO Support Reduces M&A Risk
CFO turnover during a transaction is one of the most disruptive events a company can face. If a CFO resigns mid-deal, whether because of the demands of the process, an offer from another company, or the uncertainty of a pending ownership change, the transaction momentum can stall for months. Diligence responses get delayed. Buyer confidence erodes. In some cases, the deal falls apart entirely.
Interim CFO support is one of the clearest risk mitigations available. A seasoned interim Partner can step in rapidly, often within days, to maintain continuity and keep the transaction on track. At a firm like Rankin McKenzie, this kind of rapid deployment is built into the engagement model because every Partner has 15 or more years of executive experience and the ability to ramp into a new environment quickly.
The same is true for companies that never had a dedicated CFO in the first place. Many private companies reach the point of exit having always relied on a controller or outsourced accountant. That structure works for operating purposes but almost never scales to meet the demands of a transaction. Bringing in a fractional CFO specifically to lead the deal provides the senior-level expertise the process requires without committing to a full-time hire that may or may not be needed after the close.
The common theme across all of these scenarios is continuity. M&A transactions punish companies that experience leadership disruption during the process, and they reward companies that maintain steady, experienced financial leadership from before the LOI through post-close integration.
The Steady Hand That Deals Require
Mergers and acquisitions are high-stakes events that test every system a company has built. Financial leadership is the specific system that tends to determine whether the transaction closes on favorable terms, whether the business remains stable through the process, and whether the post-close integration delivers the value that justified the deal in the first place.
For companies approaching an M&A event, whether as a seller, a buyer, or a party to a merger, the question is not whether senior financial leadership will be needed. It is who will provide it, at what level of experience, and whether that leadership will still be in place when the deal closes.
Navigating an M&A transaction? Schedule a consultation with Rankin McKenzie to connect with a Partner who has led dozens of transactions and can provide the interim or fractional financial leadership your deal requires.
Frequently Asked Questions
Do I need a CFO specifically for an M&A transaction?
Having a senior financial leader dedicated to the transaction is critical. The diligence workload, the deal structuring, the coordination with legal and advisory teams, and the financial narrative that supports your valuation all require executive-level focus. Without that focus, the quality of your diligence responses suffers, and both buyer confidence and deal value can erode quickly.
What happens if our CFO leaves during a deal?
CFO turnover during a transaction is one of the most disruptive events a company can face. Deal momentum stalls, diligence responses fall behind, and in some cases the transaction falls apart entirely. An interim or fractional CFO from a firm like Rankin McKenzie can step in rapidly, often within days, to maintain continuity and keep the deal on track.
How early should we engage financial leadership for an exit?
Ideally 12 to 18 months before a planned exit. This window gives you time to clean up financials, normalize EBITDA, address customer concentration or contract issues, and build the financial narrative that supports the valuation. Companies that start preparation earlier consistently achieve better outcomes than those that engage senior financial leadership only after an LOI is signed.
What financial documents are needed for due diligence?
Buyers typically require 3 to 5 years of audited or reviewed financial statements, detailed revenue breakdowns by product and customer, customer concentration data, debt schedules, accounts receivable and payable agings, projections with clearly documented assumptions, and a working capital analysis. Many transactions also involve a quality of earnings report, either prepared by the seller in advance or commissioned by the buyer during diligence.
Can a fractional CFO handle the entire M&A financial process?
Yes. Experienced fractional CFOs have led dozens of transactions across industries and deal sizes, and they can manage the entire financial arc of an M&A process. That includes preparation before the LOI, diligence response, deal structuring support, coordination with external advisors, and post-close integration planning. Rankin McKenzie’s Partners bring this level of experience to every engagement.
