Acquisitions are how PE firms build value. You buy a platform company, bolt on complementary businesses, and aim to sell at a multiple of what you paid within three to five years. The strategy is straightforward, but M&A integration—specifically the financial side—is where most acquisitions lose time and value. Investor-backed portfolio companies that integrate within 30 days of close achieve consolidated reporting by day 60 and eliminate the dual-disruption of delayed migrations.
However, Consero’s 2025 survey of finance leaders found that 30% of investor-backed CFOs cite integrating post-M&A financials as their top challenge. Too frequently, the portco CFO becomes the person caught between running the existing finance operation and absorbing a newly acquired business onto the same systems, processes, and reporting structure. Without the right support, that integration drags on for months, delays financial closes, burns out staff, and erodes the very value the acquisition was supposed to create.
It doesn’t have to work that way. Here’s what PE firms should know about setting up their CFOs and their portfolio companies for faster, smoother M&A integrations.
Why Do In-House M&A Integrations Fail?
In-house integrations fail when the same team responsible for daily transactions, monthly close, and payroll gets asked to stand up a new entity on the parent company’s ERP without dedicated resources, a repeatable playbook, or deep platform expertise.
Most portfolio companies don’t have a dedicated implementation team sitting on the bench. When an acquisition closes, the people responsible for integrating it are the same people running the existing finance engine. They already have full-time jobs.
Asking them to also stand up a new entity on the parent company’s systems creates a cascade of problems.
- Transactional processing slows down
- The monthly close gets pushed back
- Overtime hours pile up and stress increases
- What should take 30 days stretches into months
The downstream consequences are real. In Consero’s 2022 CFO survey, 36% of finance leaders said a poorly run F&A function leads directly to an inability to absorb potential acquisitions — meaning a botched integration doesn’t just slow things down, it can block the next deal entirely.
That’s assuming the team even has the skills. Integrating an acquired company into an ERP system like Sage Intacct or NetSuite requires deep familiarity with the platform—how to set up new entities, map charts of accounts, configure AP and AR workflows, and consolidate reporting. Further, an in-house controller may have done two or three implementations in their entire career.
“You’re looking for a unicorn—a controller who’s done integrations with multiple systems, knows the ERP well enough to set it all up, and still handles the fundamentals of GAAP and daily accounting. Finding that one person is very difficult.” —— Chris Hartenstein, Practice Director, Consero
Some firms try a different approach: using the acquired company’s finance staff to run the integration. That’s typically even worse. Those employees are unfamiliar with the parent’s systems, don’t know the existing processes, and bring their own biases from whatever platform they were on before. Their learning curve is steeper, and the result is more friction, not less.
In a 30-minute call, we’ll benchmark your portfolio’s finance operations and identify where integration speed, reporting visibility, or cost structure can improve. You’ll get a free assessment — no strings attached.
Why You Should Start the Integration Immediately
M&A integration should begin the day after close. Waiting creates a second wave of disruption: the acquired company endures change management at close, then faces another round of upheaval months later when the migration begins. Starting immediately consolidates all the disruption into one window.
The cost of waiting:
- The acquired business adapts to new ownership at close
- Then, six months later, gets hit with another round of upheaval during the system migration
- Staff endures change management twice instead of once
The faster path:
- Integration starts the day after close
- Acquired entity is on the parent’s platform within 30 days
- Consolidated reporting is in place by month two
- By day 90, the acquisition runs on the same processes as the rest of the company — and the CFO isn’t thinking about it anymore
This approach consolidates the pain into a single window. The acquired team is already adapting to new ownership. Stack the system migration on top of that, get the change management behind you all at once, and move forward.
starts tomorrow
the parent’s platform
reporting in place
CFO focuses forward
What Do Successful M&A Integrations Look Like?
A successful M&A integration is fast (measured in weeks, not quarters), produces consolidated reporting early, and doesn’t disrupt the day-to-day finance operation that’s already running.
Speed
Integration completes in weeks, not quarters. The goal is having the acquired entity on the parent’s platform within 30 days of close — not still migrating six months later.
Early consolidated reporting
The CFO and PE sponsor have full visibility into the combined entity without relying on manual Excel consolidations or shadow systems. Consolidated reporting should be in place by day 60.
Zero disruption to the existing finance function
Month-end close still happens on time. AP and AR are still processed. A dedicated implementation team operates separately from the ongoing finance function and handles:
- System setup in Sage Intacct, NetSuite, or the parent’s existing ERP
- Chart of accounts mapping
- User configuration
- Process documentation for new employees
- The full technical migration
The existing team keeps closing the books.
The Repeatable Playbook Advantage
A repeatable playbook, built across hundreds of integrations, gives PE-backed portfolio companies a structured, edge-case-aware process that first-time in-house teams can’t replicate. Consero’s M&A integration process includes a 496-item checklist refined over 180+ acquisition integrations.
When you’ve done something hundreds of times, you develop a process that accounts for the things first-timers miss. Not every item applies to every deal — but that’s the point. The checklist is comprehensive enough to catch the unusual situations that cause problems when they’re overlooked.
What an in-house team misses:
- Unique revenue recognition structures that need special handling
- Multi-entity consolidation requiring a non-standard approach
- Billing models that don’t map cleanly into the parent’s existing framework
An in-house team doing their first or second integration won’t have a checklist like that. They’re building the plane while flying it. A partner with hundreds of integrations under their belt already knows what to look for, what to ask, and how to solve for edge cases before they become problems.
“Each subsequent acquisition gets easier. We tailor the playbook to the specific company, keep the same implementation resources assigned, and cut down the time it takes on the second, third, and fourth integration.” —— Chris Hartenstein, Practice Director, Consero
How to Free the CFO to Focus on What Matters
M&A integration handled by a dedicated partner frees the CFO from transactional plumbing — chart of accounts mapping, bill pay configuration, system migrations — so they can focus on the strategic work that drives value from day one.
When a portfolio company’s CFO is stuck managing the mechanics of an acquisition integration, they’re not doing the work that accelerates the growth thesis.
Where the CFO’s time should go after an acquisition:
- Aligning sales teams across the combined entity
- Integrating operational workflows
- Supporting due diligence for the next deal
- Providing strategic insight to the PE sponsor
With a partner handling the finance integration, the CFO isn’t pulled into transactional details. They set high-level expectations, get flagged when their input is needed, and focus on the change management and operational alignment that only they can drive — from day one, not 60 or 90 days later. It’s why M&A transaction support is the #1 service PE-backed CFOs rely on from finance partners, cited by 53% of respondents in Consero’s 2024 CFO survey.
Why You Shouldn’t Overlook the Human Side of M&A Integration
The integration is as much a people problem as a systems problem. The acquired company’s finance staff holds critical institutional knowledge, and losing it too early creates gaps that are expensive to fill.
What the acquired team provides:
- Explanations of how things actually work on the ground
- Early flags on potential issues before they surface
- Mapping of the old world into the new one
How to protect that knowledge:
- Keep those people engaged during the first 30 days of integration
- Capture institutional knowledge before roles transition
- Be upfront about role changes from the start — making promises you can’t keep creates resentment and undermines the integration
Good communication with the acquired company’s team sets the stage for the entire process. Be clear about what’s changing, when it’s happening, and what you need from them. The rest follows from there.
How to Build the Infrastructure for Serial Acquisitions
PE firms running a buy-and-build strategy need a repeatable M&A integration model — standardized systems, proven processes, and a team that doesn’t require recruiting and onboarding for every new acquisition.
What a serial acquisition infrastructure requires:
- Standardized ERP (Sage Intacct, NetSuite, or equivalent) deployed consistently across portfolio companies
- A proven integration playbook that gets faster and more efficient with each deal
- A dedicated implementation team that doesn’t need to be rebuilt from scratch for every acquisition
The standard every M&A integration should meet:
- Consolidated financial reporting within 60 to 90 days
- The acquired entity running on the parent’s platform
- The CFO free to focus on the next chapter of growth
When that’s the standard, acquisitions stop being a drag on the finance function and start being the growth accelerator they’re supposed to be.
