In M&A, CDD means commercial due diligence. It is the evidence-based assessment of whether a target's revenue is real and whether its growth story is achievable. Financial diligence validates history. Legal diligence covers liabilities and structure. Commercial diligence tests the forward-looking claim, which is the one the price is built on.
The four questions it has to answer
Is the market attractive, and growing for reasons that will persist? Does the company hold a position competitors cannot easily take? Are the customer economics genuine, meaning retention, pricing power and unit economics that survive contact with the customers themselves? And what would have to be true for the growth plan to work?
Everything else in a CDD report is supporting evidence for those four.
Why it decides more deals than accounting issues do
The largest downside risk in most deals is not a restatement. It is a growth narrative nobody independently tested. Accounting problems get found, because financial diligence is mature and quality of earnings work is standard. Overstated market opportunity often does not get found, because testing it requires primary research that costs money and time the process does not allow.
This has become more expensive to get wrong. McKinsey's Global Private Markets Report 2026 cites StepStone analysis showing that for deals done between 2010 and 2022, leverage and multiple expansion accounted for 59% of returns, with the remaining 41% coming from revenue growth and EBITDA margin expansion net of dividends and debt paydown. McKinsey's own conclusion is blunt: the traditional drivers of past returns, meaning low purchase prices, multiple expansion and cheap leverage, are largely spent, and the next decade will have to rely far more on operational value creation. The debt share of entry multiples has already fallen from 44% in 2016 to 37% in 2025.
If nearly six tenths of historical returns came from levers that are no longer available, the diligence that underwrites the remaining four tenths stops being a procedural step and becomes the thing the return depends on.
When to run it
Three points in a process, with different depths.
A pre-LOI scan is fast and directional, built to decide whether to spend real money on the deal at all. A full post-LOI CDD is diligence grade and supports final pricing, terms and the debt case. Vendor CDD is commissioned by the seller before a process starts, to anticipate the questions buyers will ask and to avoid finding out about a problem in week three of exclusivity.
The workstreams
Market attractiveness. Size and growth, but structured so the number means something. Total addressable market, then serviceable segments, then growth by segment rather than in aggregate. Demand drivers and cyclicality. Where the profit pools actually sit in the value chain, which is often not where revenue sits. Geographic and segment mix, so you can see where growth is genuinely coming from rather than where it is claimed to come from.
The market sizing questions worth asking are narrower than the ones usually asked. Not how big is the market, but: how big is the part of it this company can realistically sell to, growing at what rate, and what happens to that number if the segment definition tightens by one degree? Inflated TAM is almost always a definitional problem rather than an arithmetic one.
Competitive position. Direct competitors, substitutes, and the make-versus-buy dynamic that determines whether the category exists at all in five years. What actually differentiates the target, and whether it is product, brand, distribution, switching costs or network effects. How competitors are likely to respond once the growth plan starts working, which is the step teams most often skip.
Customer and revenue quality. This is the centre of the work. Segmentation, concentration, cohort retention curves, renewal behaviour, pricing power and leakage, pipeline conversion, win and loss drivers. A CDD without customer conversations is not a CDD. Management's account of why customers stay is a hypothesis, not evidence.
Go-to-market. Whether the model can scale without breaking. Channel strategy and channel conflict, sales coverage and productivity, customer acquisition cost and payback, readiness to enter a new segment or geography.
Growth and value creation. Beyond validating the base case, quantifying credible upside and what it requires. Pricing actions, cross-sell, adjacent segments, and the operational enablers each one depends on.
What is different about PE commercial diligence
Corporate buyers can absorb a mediocre acquisition into a larger business. A fund cannot. That produces four differences in emphasis.
Downside case rigour comes first, because lenders underwrite the downside and the IC votes on it. Customer truth, established through independent calls rather than management-supplied references. Unit economics by segment and product, not blended, because blended numbers hide the segment that is actually losing money. And an exit narrative that has to hold up in three to five years, which means asking what a future buyer will pay for and whether this business will still have it.
The exit assumption deserves particular scrutiny, because the window has moved. The median holding period for PE-backed companies reached 6.0 years in early 2026, the longest since Private Equity Info began tracking the metric, and PitchBook counted 33,575 unsold portfolio companies at the end of June, up from 32,451 at the end of 2025. Longer holds mean the growth plan has to keep working further out than most diligence tests it, which argues for underwriting the durability of a competitive position rather than the slope of a curve.
Red flags CDD is designed to uncover
Customer concentration where a handful of accounts carry the revenue. Renewals propped up by discounting rather than value. Product parity dressed up as differentiation, visible in a win rate that depends on price. TAM inflated by a loose category definition. Dependence on a channel partner whose incentives are shifting. An expansion thesis that amounts to the same playbook in a new segment with no evidence of fit. Pricing that varies across similar customers for no describable reason.
Choosing a CDD provider
Sector familiarity matters less than people assume and interview capability matters more. Ask any firm you are considering for three things: the three to five hypotheses they would test first in this specific deal, how many customer and channel interviews they run and how they control for selection bias, and exactly what data they need from the target to quantify churn, pricing and segment performance. A team that cannot answer the third question has not done this at depth.
The other thing to test is whether they will disagree with you. A CDD that confirms the thesis you walked in with has cost you money and told you nothing.
How long does commercial due diligence take?
Timelines depend on the process and data availability, but many buy-side CDD engagements run 3-6 weeks. A common pattern is:
- Week 1: thesis definition, initial management interviews, data request, research plan
- Weeks 2-3: customer/channel interviews, market sizing, competitor benchmarking, early findings
- Weeks 4-5: driver-based modeling, sensitivity analysis, value-creation plan
- Week 6: final report and IC-ready presentation
Best practices to get maximum value from CDD
The teams that get most out of CDD do four things consistently. They scope the work to the handful of questions that actually change price or conviction, rather than commissioning a survey of everything. They require two independent sources before any conclusion goes in the report. They express findings as drivers and ranges rather than narratives, so the model can absorb them. And they align definitions with the financial diligence team early, particularly on revenue recognition, churn and cohort logic, because two workstreams measuring churn differently will produce two irreconcilable views of the same business.
Commercial due diligence is the discipline of validating the growth story in M&A. For private equity and corporate acquirers, it reduces the risk of overpaying, strengthens investment conviction, and turns market and customer insights into a practical value-creation plan. When done well, CDD sets the agenda for post-close execution.
FAQ
What does CDD stand for in M&A? Commercial due diligence. It is distinct from customer due diligence, which refers to AML and KYC checks in financial services.
What is the difference between CDD and FDD? Financial due diligence validates historical numbers, normalises EBITDA and tests working capital. Commercial due diligence tests the forward-looking case: market, competition, customers and the feasibility of the growth plan.
What is in a commercial due diligence report? Findings and investment implications, a market model with segment sizing, a customer insights summary, base, upside and downside cases tied to named drivers, and a prioritised value creation plan.
Who commissions commercial due diligence? Private equity funds and corporate acquirers on the buy side, lenders in support of debt underwriting, and sellers running vendor CDD ahead of a process.
