What does commercial due diligence cover? A guide for private equity and M&A teams
What a commercial due diligence looks at, how it differs from financial due diligence, which red flags matter and what a decision-ready report should contain.
Before an investor commits to a company, the numbers have to be checked. Financial due diligence checks the past. Commercial due diligence asks whether the growth in the investment case is realistic, and that depends on how the company actually wins and keeps customers.
Short answer: Commercial due diligence is an independent assessment of a target’s market position and commercial engine before a deal. It tests whether the revenue plan is credible by looking at customers, competition, pipeline, conversion, retention and the quality of the data behind the reported numbers. The output is a report the deal team can use to decide, and a view of the growth levers that matter after closing.
Commercial versus financial due diligence
| Financial due diligence | Commercial due diligence | |
|---|---|---|
| Main question | Are the reported results accurate? | Is the growth plan credible? |
| Looks at | Accounts, margins, cash flow, working capital | Market, customers, competition, sales and marketing performance |
| Time focus | Mostly the past | Mostly the future |
| Typical output | Adjusted earnings and risks in the numbers | A view on market, position and growth potential |
The two overlap, but one does not replace the other. A company can have clean accounts and a growth story that does not hold.
Who does what in a due diligence
A deal usually involves several advisers, each with a different question. Most providers that describe due diligence services in Belgium focus on financial, legal and tax review. Commercial due diligence is a separate workstream, and it is often the one that gets the least time.
| Workstream | Usually done by | Question it answers | Typical output |
|---|---|---|---|
| Financial | Accounting and advisory firms | Are the reported results and cash position accurate? | Adjusted earnings, net debt, working capital |
| Tax | Tax advisers, often the same firms | Are there tax exposures or structuring issues? | Tax risks and structure advice |
| Legal | Law firms | Are contracts, ownership, IP and employment in order? | Legal risks and conditions for the deal |
| Operational and IT | Operational advisers, sector specialists | Can operations and systems support the plan? | Capacity, systems and cost findings |
| Commercial: market | Strategy consultancies | How large and attractive is the market, and where does the target sit? | Market size, growth and positioning view |
| Commercial: engine | Specialist growth firms | How does the target really win and keep customers, and can that scale? | Funnel, conversion, retention and data findings |
The last two rows are often mixed up. A market study tells you whether a market is attractive. An assessment of the commercial engine tells you whether this company can capture the growth. A good deal team asks for both questions to be answered, by the same adviser or by two.
How to choose and sequence:
- Decide the main risk first. A founder-led business with unclear sales needs the commercial engine checked. A company with complex contracts needs legal first.
- Ask what evidence the adviser will use. Customer interviews, CRM and funnel data, and channel analysis are stronger than management presentations alone.
- Check access. The adviser needs the CRM, a selection of customers and the commercial team within the deal timeline.
- Agree the output upfront. A ranked list of risks and a post-closing plan helps more than a long document.
Why it matters more now
Deal maths has become harder. According to Bain, rising interest rates and shifting market dynamics mean that a deal which needed about 5% EBITDA growth ten years ago to reach a 2.5x return over a five-year hold now needs about 12% (Bain, Private Equity Midyear Report 2026). When less of the return can come from financial structure, more has to come from commercial and operational growth. That is what a commercial due diligence tests: whether the growth the model assumes is credible before you pay for it.
What a commercial due diligence looks at
A solid assessment covers five areas.
- Market. How large and how fast-growing is the market, and what is the target’s real position in it?
- Customers. Who buys, why they buy, why they leave, and how concentrated the revenue is. Customer interviews often reveal more than internal reports.
- Competition. Who the target actually loses deals to, and how it is positioned against them.
- The commercial engine. How leads and opportunities are generated, how they convert, what the sales cycle looks like, and which channels and people drive results.
- Data and measurement. Whether the CRM and tracking can be trusted. If the reported pipeline cannot be traced, the forecast cannot be trusted either.
The fourth area is where we focus. At Stretch, our commercial due diligence applies the method of our Growth Audit to a deal: an independent look at how the target wins and keeps customers, built for investors instead of for the company itself.
Red flags in the commercial engine
These patterns often signal that a growth plan is weaker than it looks:
- Growth that depends on referrals or on one person. If most new business comes from the founder’s network, it is hard to scale.
- A pipeline nobody can explain. Large totals, but no clear definition of stages, no conversion data and no reliable forecast.
- A strong lead number and a weak conversion. Many leads, few opportunities, and a gap between marketing and sales.
- High customer concentration or high churn hidden behind average figures.
- Unreliable data. A CRM that is incomplete, duplicated or edited after the fact.
None of these automatically means “do not invest”. Each one tells you what the buyer must fix after closing, and what the price should reflect.
What a good report contains
A report is only useful if it supports a decision. Ask for:
- A clear view on whether the commercial assumptions in the investment case hold, and where they do not.
- The evidence behind each conclusion, such as customer interviews, funnel data and channel analysis.
- The main risks, ranked by impact on the case.
- The growth levers that matter after closing, so the first 100 days start with a plan.
When a commercial due diligence is not enough
- When the main risk is financial or legal. Then you need those workstreams first.
- When there is no time or access. Without access to CRM data and a few customers, the conclusions stay on the surface.
- When you need an execution plan. Due diligence tells you what is true. Building the plan after closing is a separate step.
How we work
Our commercial due diligence is a fixed premium price per deal, set for speed and depth of analysis. We do not publish amounts, because the scope depends on the target and the timeline of the deal. You can read more on our commercial due diligence page, or see how we work with private equity.
Where to start
If you are preparing a deal, write down the three commercial assumptions in the investment case that would change your decision if they turned out wrong. Those are the questions the due diligence must answer first. To talk about a specific deal, contact us.
Hear it from the people who do it
- Jürgen Ingels on why commercial due diligence is rarely done
- Daan De Wever on sales assessment in acquisitions
Sources
- Bain & Company, Private Equity Midyear Report 2026, “Control the Controllable, Weather the Rest” (June 2026). The 5% to 12% comparison is Bain’s illustration and depends on its assumptions of a 2.5x return over a five-year hold.
