I've sat on both sides of the due diligence table. I've been the interim CFO preparing a business for exit, and I've reviewed finance functions as part of acquisition assessments. The pattern is remarkably consistent: certain finance weaknesses reliably cost sellers 10-15% of enterprise value.
On a £100m exit, that's £10-15m. Not theoretical money. Real money that the seller leaves on the table because their finance function wasn't ready for scrutiny.
The frustrating part is that every one of these red flags is fixable. They just need time, typically 12-18 months. Which means the cost of not preparing early is enormous.
Here are the five red flags I see most often, why they matter, and what to do about each one.
Red flag 1: Close cycle longer than 10 days
When a buyer's due diligence team asks how long your month-end close takes and the answer is anything north of 10 working days, alarm bells ring. Not because they care about your close process per se, but because of what a slow close signals.
A long close cycle tells buyers that the finance function lacks control over its own data. If it takes you 15 or 20 days to produce a set of management accounts, there are almost certainly manual workarounds, data integrity issues, and process bottlenecks embedded in that timeline. Every one of those is a risk factor.
More practically, a slow close makes the due diligence process itself painful. Buyers need data. They need it quickly, in consistent formats, with clear audit trails. If your team is spending three weeks producing monthly numbers, they're going to struggle to respond to DD information requests at the pace buyers expect. That extends the DD timeline, which increases costs and creates opportunities for the deal to stall.
I worked with a business where the 18-day close was explicitly cited in the buyer's DD report as a material weakness. The buyer used it as leverage to negotiate a £2m price reduction on a £30m deal, arguing that the finance function would need significant investment post-acquisition. The seller had known about the slow close for years. Fixing it would have cost a fraction of what it ultimately cost in lost value.
What good looks like: 5-7 day close cycle. Management accounts produced within 10 business days. No restatements. Board pack delivered on a predictable schedule.
Red flag 2: No consolidated reporting across entities
This one is almost universal in buy-and-build strategies, and it's a deal-breaker more often than people realise.
When a PE-backed business has made multiple acquisitions but hasn't consolidated the finance function, you end up with separate charts of accounts, different reporting formats, inconsistent KPI definitions, and a consolidation process that runs on spreadsheets and hope. I've seen businesses where the "group accounts" are literally a series of copy-paste operations from entity-level reports into a master spreadsheet, with manual adjustments that only the FD understands.
Buyers see this as a fundamental integration failure. If you've owned these businesses for three years and you still can't produce a single, unified view of group performance, what does that say about your management capability? What does it say about the reliability of the numbers you've been presenting?
For trade buyers, it also signals significant post-acquisition integration cost. They're going to have to do the consolidation work you didn't, and that cost gets priced into the deal. For secondary PE buyers, it raises questions about whether the reported EBITDA is truly comparable across periods, which directly affects the multiple they're willing to pay.
One business I worked with had four entities on three different accounting systems with no unified chart of accounts. The DD process took seven months instead of the expected three because every number had to be verified at entity level. By the time the deal closed, the buyer had negotiated a retention holdback and a price adjustment that together cost the seller roughly 12% of the original valuation.
What good looks like: Single chart of accounts across all entities. Automated consolidation. One set of group management accounts that any qualified accountant could understand. Intercompany transactions eliminated cleanly with an audit trail.
Red flag 3: Key-person dependency
This is the silent killer. Every finance function has its hero — the controller who's been there since the first acquisition, who knows where everything is, who can produce any number on request because it all lives in her head.
That hero is a catastrophic risk, and buyers know it.
Key-person dependency in finance means that institutional knowledge isn't documented, processes aren't standardised, and the business is one resignation away from chaos. In DD, buyers assess this through interviews, process documentation reviews, and sometimes by asking team members to explain processes that the key person usually handles. The results are often telling.
The risk gets priced into the deal in two ways. First, the buyer may require a retention package for the key person, funded by the seller, typically through an escrow or holdback. Second, and more expensively, the buyer may discount the valuation to reflect the cost of building proper documentation, cross-training, and process resilience that should already exist.
I once saw a DD report that explicitly stated: "The finance function is operationally dependent on a single individual. Should this individual depart within 12 months of completion, the buyer estimates a cost of £400K-£600K to rebuild institutional knowledge and stabilise operations." That estimate was deducted from the purchase price.
What good looks like: Documented processes that anyone qualified could follow. At least two people capable of performing every critical function. A team structure that survives any single departure without service disruption. Clear handover documentation maintained as a living asset, not something created in a panic.
Red flag 4: Manual reconciliations with no audit trail
Reconciliations are where data quality lives or dies. And in DD, they're one of the first things the buyer's accountants examine.
When reconciliations are manual — spreadsheet-based, performed by copying data from one system, pasting it into another, and manually matching transactions — two problems emerge. First, the error rate is inherently higher. Humans make mistakes, especially when they're working under time pressure during a close. Second, there's no systematic audit trail. The reconciliation exists as a spreadsheet on someone's laptop, with no version control, no approval workflow, and no way to demonstrate to a buyer that the process was consistently followed.
This matters because reconciliation quality is a direct proxy for data reliability. If a buyer can't trust the reconciliations, they can't trust the numbers. And if they can't trust the numbers, they either walk away or they discount.
I've seen DD teams spend days working through manual bank reconciliations, finding unexplained differences dating back months. Differences that the finance team had been "parking" in suspense accounts with the intention of investigating later. Later never came. Those unexplained differences became adjustments in the DD completion accounts, always in the buyer's favour.
What good looks like: Reconciliations performed in a system with an audit trail — ideally automated where possible. Exceptions flagged and resolved within the period. Zero unexplained balances. Reconciliation sign-off by someone other than the preparer. A history that shows consistent execution, not just a clean snapshot at the DD date.
Red flag 5: No forward-looking financial model
What surprises people is that due diligence isn't just about proving the past. It's about demonstrating the future. If you can't show buyers a credible, well-structured financial model that tells them where the business is going, they'll assume it's going nowhere.
I don't mean a budget. I mean a proper three-statement model — P&L, balance sheet, and cash flow — with clearly stated assumptions, scenario analysis, and sensitivity testing. A model that can answer questions like: what happens to margins if raw material costs increase 15%? What's the cash impact of that acquisition pipeline? How does the EBITDA bridge from current performance to the investment case?
Without this, the buyer builds their own model. And their model will always be more conservative than yours, because they don't have the context you have, and they're incentivised to see downside, not upside.
One seller I worked with had been running the business on a single-year budget with no balance sheet or cash flow projections. When the buyer asked for a three-year model during DD, the finance team scrambled to build one in two weeks. It was inconsistent with the historical data, the assumptions weren't documented, and it fell apart under questioning. The buyer concluded that management didn't have a credible view of the future, which directly affected the multiple they were willing to pay.
What good looks like: A rolling three-year model, updated quarterly. Three statements that balance. Clearly documented and defensible assumptions. Scenario analysis that shows upside, base case, and downside. A model that the CFO can walk through line by line under questioning without hesitation.
The due-diligence ready checklist
If you're preparing for exit, here's what "ready" actually looks like. This isn't exhaustive, but it covers the items that most commonly cause problems:
Financial close and reporting:
- Month-end close completed within 5-7 working days
- Management accounts produced within 10 business days
- Consolidated reporting across all entities with a unified chart of accounts
- Zero unexplained restatements in the trailing 12 months
- Board pack delivered on a consistent, predictable schedule
Data integrity and controls:
- All material reconciliations performed systematically with an audit trail
- No unexplained balances in suspense or intercompany accounts
- Automated bank feeds and reconciliation where possible
- Segregation of duties in place for all material processes
- Clear approval workflows for journals, payments, and accruals
People and process:
- All critical finance processes documented in standard operating procedures
- No single point of failure — at least two people trained on every critical process
- Finance team structure appropriate for the business's complexity
- Clear roles and responsibilities documented and understood
Forward-looking capability:
- Three-statement financial model updated quarterly
- Assumptions documented and defensible
- Scenario analysis available (base, upside, downside)
- Cash flow forecasting with 13-week rolling visibility
- EBITDA bridge from current to projected clearly articulated
Due diligence logistics:
- Virtual data room structured and maintained (not built in a rush)
- Historical financial data easily extractable in consistent formats
- Tax, statutory, and management accounts reconciled
- Key contracts, leases, and commitments documented and accessible
The timeline: what to fix and when
If you're 12-18 months from a potential exit, here's the order I'd address these in:
Months 1-3: Foundation. Standardise the chart of accounts across all entities. Document all critical processes. Start the data cleanup — master data, intercompany balances, suspense accounts. This is the unglamorous work that everything else depends on.
Months 3-6: Close and reporting. Optimise the month-end close. Build consolidated reporting. Eliminate manual workarounds. Get the close cycle below 7 days and the board pack below 10 business days.
Months 6-9: Controls and resilience. Implement proper controls and audit trails. Cross-train the team to eliminate key-person dependencies. Build the reconciliation framework.
Months 9-12: Forward-looking. Build or rebuild the three-statement model. Establish rolling forecasting. Develop the EBITDA bridge and management presentation narrative.
Months 12-18: Polish and prepare. Structure the data room. Run a mock DD with your advisers. Stress-test the finance function's ability to respond to information requests at pace. Fix whatever breaks.
This timeline assumes you're starting from a position of reasonable maturity. If you're starting from a 20-day close with no consolidated reporting, add 6-12 months. The earlier you start, the more value you protect.
The bottom line
The best time to prepare for due diligence is the day after acquisition. The second best time is today.
Every one of these red flags is fixable. None of them require exotic technology or enormous budgets. They require focus, discipline, and time. The finance functions that create value at exit aren't the ones with the fanciest systems. They're the ones where the basics are bulletproof.
Look at your finance function through a buyer's eyes. If what you see makes you nervous, it will make them nervous too. And nervous buyers pay less.
Fix it now. The return on that investment will be the best your portfolio has ever seen.
The Finance Diagnostic will tell you exactly where your finance function stands against each of these red flags — with enough time to fix them before they cost you at exit. If the assessment confirms you need a full programme, the Exit-Ready Finance Transformation is designed specifically for this.
