Commercial due diligence tests the market and revenue story behind a business you may buy. Review customer concentration, demand, retention, pricing, competitors, market size, acquisition channels, reputation, search visibility and the assumptions supporting future growth. Keep commercial work connected to separate financial, legal, tax and operational diligence.
Key points
- Financial statements do not explain why customers will keep buying.
- Customer concentration can turn one relationship into a material acquisition risk.
- A growth forecast should be tested against market size, competition, capacity and acquisition economics.
- Commercial findings often create follow-up questions for legal, accounting, tax, cybersecurity or operational specialists.
Test the market the business actually serves
Define the products, customers, geography and use cases that generate the target’s revenue. Compare that definition with the market-size and growth claims used in the sale process.
A broad industry growth rate may have little relevance if the target operates in a slower niche or depends on one region.
Understand customer quality and concentration
Review revenue concentration, retention, repeat purchasing, contract terms, customer tenure and churn where reliable data is available.
Ask what would happen if the largest customer left, a contract changed or one acquisition channel became more expensive.
Rebuild the competitor picture
Identify direct competitors, substitutes and newer entrants. Compare price, offer, reputation, distribution, search visibility and the reasons customers choose the target.
A strong historical position can weaken quickly if the target has not kept pace with changing customer expectations or digital discovery.
Challenge the growth case
Connect the forecast to the number of customers required, expected price, sales capacity, acquisition channels, retention and operating capacity.
The point is not to create a second financial model. It is to test whether the commercial assumptions behind the forecast are plausible.
Build an issue register across diligence teams
Commercial research may reveal unusual customer terms, regulatory dependence, technology risk or supplier concentration. Record which specialist needs to investigate each issue.
Keep unresolved questions visible through the decision and assign each one to the appropriate adviser.
Questions people ask before they act
What is the difference between commercial and financial due diligence?
Financial due diligence examines the financial record and accounting-related matters. Commercial due diligence tests the market, customers, competitors and revenue assumptions behind the business.
Can commercial due diligence be done for a small business?
Yes. The scope can be scaled to the transaction while still checking the market, customers, competitors and growth assumptions that matter most.
What if the seller will not share customer-level data?
An outside-in review can still be useful, but the limitation should be stated. Material customer concentration and retention questions may remain unresolved without access to reliable internal data.
Does commercial due diligence replace legal or tax advice?
No. It should surface questions for those advisers, not replace their work.
Primary data and official references
These sources are useful for checking market size, business activity, economic conditions and the rules that shape a commercial decision.
Related DSDillon services
Send the market, competitor, location, acquisition or expansion question you need answered and the decision it will support.
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