Risk & diligence
Customer Concentration Risk in a Business Acquisition
Measure concentration by revenue and gross profit, test contract and relationship transfer, and model the effect of losing a major customer.
A practical research brief from the Business Buyer Check learning library.
Who This Is For
Business buyers and advisers deciding what to verify, what remains unresolved, and what should change before closing.
What This Checks
- Calculate More Than Revenue Share
- Inspect Contract Durability
- Separate Company Relationships from Owner Relationships
- Test Quality and Collectability
- Run Loss Scenarios
Inspect Contract Durability
Review term, renewal, termination, assignment, change of control, pricing, volume, exclusivity, service levels, warranties, and customer consent. An invoice history is not a transferable contract.
Separate Company Relationships from Owner Relationships
Identify who sells, serves, resolves problems, negotiates price, and holds personal trust. Plan introductions and retention without making unauthorized customer contact.
Test Quality and Collectability
Review churn, cohorts, credits, refunds, chargebacks, disputes, receivable aging, payment terms, and contribution margin. High revenue with weak margin or collections can overstate importance.
Run Loss Scenarios
Model loss, volume reduction, repricing, delayed payment, and replacement costs for major accounts. Recalculate earnings, working capital, DSCR, and buyer return.
Structure Around Exposure
Possible tools include lower price, seller note, earnout tied to retained gross profit, holdback, customer consent, transition support, or a stop rule. Counsel should define enforceable terms and privacy-safe confirmation.
Illustrative Buyer Example
How a Buyer Would Apply This Guide
A seller’s headline earnings support the asking price, but the supporting records are incomplete. The buyer follows this guide to identify the missing inputs, reproduce the calculation, request independent support, model the downside, and convert unresolved items into offer protections rather than treating the claim as verified.
Classification: Illustrative analysis—not a live finding, valuation conclusion, or recommendation to buy.
Frequently Asked Questions
What percentage is too concentrated?
There is no universal threshold. Contract strength, margin, switching risk, relationship ownership, financing, and replacement capacity determine materiality.
Should a buyer contact customers?
Only with seller authorization and a controlled process that protects confidentiality and the business. Review the plan with advisers.
Is recurring revenue always transferable?
No. Recurrence in history does not guarantee renewal, consent, assignability, pricing, or retention after ownership changes.
This educational material is preliminary decision support, not legal, tax, accounting, lending, appraisal, or investment advice. Requirements and transaction terms vary; verify current rules with qualified advisers and official sources.
Recommended Next Step
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