Commercial due diligence: what to check before an acquisition

Commercial due diligence examines whether the business you want to acquire has a credible commercial future. It tests the customers, competition, revenue drivers and growth assumptions behind the transaction. The question is straightforward: does the evidence support the business you believe you are buying?

A profitable company can still depend on a departing founder, a fragile distribution agreement or a customer segment that has stopped expanding. Equally, an untidy sales operation can conceal a strong underlying proposition. The purpose of diligence is to distinguish these situations before the acquisition decision becomes difficult to reverse.

This guide sets out a practical approach for company owners, private equity teams and corporate growth leaders. It focuses on the evidence needed to assess a target and turn the findings into a clear decision.

What is commercial due diligence?

Commercial due diligence assesses the sustainability of a company’s revenues and the credibility of its growth plan. Typical areas include market demand, customer behavior, competitive differentiation, pricing, sales effectiveness and opportunities for expansion.

It should explain how the company wins business, why customers stay and what could prevent future growth. It also examines whether the buyer’s proposed improvements are achievable with the resources, capabilities and investment available.

The work connects with other diligence streams, but each has a different emphasis:

• Commercial diligence: demand, customers, positioning, revenue drivers and growth assumptions.
• Financial diligence: earnings, accounting, cash flow, working capital and the financial information supporting the transaction.
• Legal diligence: ownership, contracts, liabilities, employment matters, intellectual property and applicable legal requirements.
• Operational and technology diligence: the systems, people and delivery capabilities required to serve customers and support the plan.

These teams need to compare findings. A commercially attractive contract may have unfavorable termination rights. An expansion plan may depend on technology investment missing from the financial model.

Start with the acquisition thesis

Before requesting hundreds of documents, write down why the acquisition should make sense. Is the buyer acquiring customer relationships, entering a new geography, adding a specialist capability or building a stronger position in an existing market?

Convert that rationale into testable statements. For example, a regional expansion thesis might depend on customers buying across several locations, the target retaining its local reputation and the combined company delivering services without weakening margins.

For each statement, identify the evidence that would support it, the evidence that would challenge it and the consequence of being wrong. This creates a focused diligence plan.

A useful question is: what finding would change our willingness to proceed, the proposed terms or the integration approach? Give those questions priority. A large data room is less valuable than a well-supported answer to an issue that could change the decision.

1. Reconstruct the sources of revenue growth

Start with transaction-level or customer-level revenue records where available. Reconcile the analysis with the financial diligence team so both workstreams use consistent periods, definitions and totals.

Separate growth into components: new customers, additional purchases from existing customers, price changes, changes in product mix, acquisitions and currency effects where relevant. A business growing through price increases has a different commercial profile from one acquiring customers consistently.

Review revenue by customer, product, channel, geography and sales team. Look for segments that produce attractive revenue but require heavy discounts, exceptional service effort or expensive implementation.

Distinguish contracted recurring revenue from repeat purchases, project income and one-time fees. Customers buying every year is encouraging, but it does not automatically create a contractual commitment.

Ask whether unusual events affected the latest period. A large project, temporary supply shortage or competitor exit can create results that should not be assumed to repeat. Document the underlying cause rather than applying a general discount to all recent growth.

2. Examine customer retention through cohorts

Company-wide retention can hide important differences. Group customers by the period they first purchased, then examine what happened to each group over time. Where appropriate, also compare cohorts by acquisition channel, contract size, product and customer segment.

Track customer losses separately from revenue losses. Losing several small customers while retaining one large account can produce stable revenue and a weakening customer base. Conversely, revenue may fall because a retained customer reduced its usage.

For recurring revenue businesses, gross revenue retention excludes expansion from existing customers; net revenue retention includes it. Keep those definitions consistent throughout the analysis. For project businesses, consider repeat engagement, intervals between projects and the share of customers that purchase again.

Connect the numbers with customer evidence. Review reasons for cancellation, support records, renewal discussions and product usage where available. A satisfied customer who no longer needs the service presents a different risk from a customer leaving because delivery has deteriorated.

3. Understand concentration and relationship ownership

Customer concentration is a starting point, not a complete conclusion. Examine the importance of major customers to revenue, gross profit, delivery capacity and future pipeline. Then investigate contract duration, renewal timing, purchasing behavior and the people who control the relationship.

Determine whether important customers buy because of the company’s capabilities or because of a personal relationship with its founder. Test whether other employees understand those accounts and can manage them effectively.

Look beyond customers. A company may rely on one distributor, marketplace, referral partner, advertising platform or supplier for access to demand. Several customers acquired through one channel can create a shared dependency even when customer concentration appears modest.

There is no universal concentration percentage that makes an acquisition acceptable or unacceptable. The relevant issue is how a plausible disruption would affect the business and what evidence supports the proposed response.

4. Test the sales pipeline against actual behavior

A pipeline is a set of opportunities, not a revenue guarantee. Review the definitions behind each stage and compare historical conversion rates with the assumptions used in the forecast.

Examine how long opportunities stay open, how often expected closing dates move and whether recently won business resembles the opportunities currently forecast. Distinguish an active buying process from a conversation that has not secured budget or a decision date.

Check for duplicate opportunities, expired proposals and pipeline concentrated around one salesperson. Separate signed commitments from management expectations and early discussions.

Then assess the sales capacity required by the growth plan. Hiring more salespeople does not immediately create a mature sales team. Recruitment, training, access to qualified opportunities and the normal sales cycle all affect the timing of additional revenue.

5. Build a realistic view of the market

A large industry does not automatically represent an accessible market. Define the customer segments the target can actually serve, the problems it solves and the alternatives buyers consider.

Build the market view from relevant customer numbers, purchasing needs and achievable contract sizes. Compare that view with external information and management’s estimates. Explain where definitions differ rather than forcing incompatible figures into one headline number.

Investigate competitors through customer decisions: why does the target win, why does it lose and when do customers choose an internal team or no purchase at all? Assess pricing pressure, switching effort and the importance of brand, service, technology and distribution.

For geographic expansion, test local delivery economics and access to customers. Success in one market does not establish that the same proposition, sales process or cost structure will work elsewhere.

6. Examine AI and technology dependencies

When a company’s growth story depends on artificial intelligence, separate the demonstration from the commercial evidence. Which customers pay for the capability? How frequently do they use it? Does it improve a meaningful customer outcome?

Review the costs and dependencies behind delivery. These can include external models, cloud infrastructure, data access, specialist employees and human review. A compelling product demonstration does not show whether the service can be delivered reliably at the assumed price.

Consider whether customers could meet the same need through a general-purpose tool or an established software provider. Identify what remains distinctive: specialized workflows, proprietary data rights, trusted distribution, integration or service expertise.

Coordinate commercial findings with technical specialists. Bain’s discussion of technology due diligence emphasizes connecting technical assessment with the transaction thesis and subsequent value-creation plan. Commercial and technical reports should explain the same business case.

A practical commercial data room request list

Request information in stages, starting with the material needed to test the acquisition thesis. Ask management to explain missing information and changes in definitions. Unexplained inconsistencies are more useful to investigate than a superficially complete folder structure.

Agree appropriate access and confidentiality arrangements with transaction counsel. Interviews and competitively sensitive information need to be handled through an agreed process, especially where the parties compete.

Use customer interviews to challenge the numbers

Interview a balanced sample where access permits: major accounts, newer customers, smaller customers, customers that reduced spending and former customers. A sample selected only from the strongest relationships will give an incomplete picture.

Ask what triggered the purchase, which alternatives were considered, where the provider performs well and what would cause the customer to change. Explore expected future purchasing without leading the respondent toward the management forecast.

Compare interviews with transaction records. Customer comments explain behavior, but a few enthusiastic conversations should not replace the underlying data. Record differences between what customers say and what their purchasing history shows.

Red flags that deserve investigation

• Reported growth that cannot be reconciled across customer records and management reporting.
• Rising sales that depend on expanding discounts or service commitments.
• Strong overall retention supported by a narrow group of expanding accounts.
• Repeatedly postponed pipeline opportunities included in near-term forecasts.
• Major customers whose relationships depend entirely on the seller.
• Expansion assumptions unsupported by customer access or delivery capacity.
• AI revenue claims that combine paid usage with trials, pilots or unrelated services.
• Different teams using incompatible definitions of customers, bookings or recurring revenue.

A red flag is a question to resolve. It can lead to further investigation, revised assumptions, different transaction protections or a decision not to proceed. Explain its significance instead of treating every issue as equally material.

A hypothetical acquisition example

Consider a buyer assessing a specialist business services company. Management presents a plan based on expanding existing accounts and selling a new AI-supported service.

The customer analysis shows that recent growth came mainly from two accounts. Older customer cohorts are stable, but newer cohorts purchase less frequently. Interviews suggest customers value specialist judgment more than the new technology.

The pipeline includes interest in the AI service, although several opportunities are unpaid pilots. Delivery analysis also identifies additional human review that was absent from the initial cost assumptions.

These findings do not establish that the company is unattractive. They change what the buyer can reasonably assume. A revised plan might prioritize protecting key accounts, improving the core proposition and validating paid demand before funding a broader AI rollout.

The example is illustrative. Its purpose is to show how evidence can change the sequence and assumptions of a growth plan without requiring an entirely different strategic rationale.

Turn the findings into a decision memo

The final output should help decision makers act. A report that lists observations without connecting them to the acquisition thesis leaves the most important work unfinished.

A concise commercial decision memo should contain:

• The thesis: why the acquisition is being considered.
• The evidence: what supports or challenges each major assumption.
• The scenarios: a grounded base case, plausible downside and clearly conditional upside.
• The unresolved questions: information gaps, their significance and who will resolve them.
• The implications: effects on the plan, required investment, integration and transaction discussions.
• The first priorities: actions, owners and measures that should carry into post-acquisition planning.

When should commercial due diligence begin?

Start with a focused commercial assessment before the business plan becomes the accepted explanation for the deal. Early work can identify questions that require customer access, specialist expertise or more detailed information later in the process.

The scope and timetable should reflect the transaction’s complexity and the quality of available evidence. A narrowly focused acquisition with reliable records requires a different process from a company entering new markets through an unproven product.

If your team is evaluating an acquisition or testing a growth thesis, explore Zendral’s consulting approach. A useful starting discussion defines the decision, the assumptions that matter and the evidence required to assess them.

For related planning, read our guides to pricing strategy and market expansion decisions.

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