A serious business acquisition involves dozens of moving parts across financial, legal, operational, and commercial domains. Without a structured checklist, it's easy to feel like you're making progress while leaving critical gaps unexamined. This guide gives you a complete, phase-by-phase due diligence framework — organized so that the most important work happens first.
Financial due diligence should always come first. If the financials don't hold up — if the adjusted EBITDA is materially lower than represented, or if there's undisclosed revenue concentration — you need to know before spending $15,000–$25,000 on legal review and weeks of operational work.
Phase 1: Financial due diligence
The financial foundation underpins everything else. Start here and don't advance to the next phase until you have clarity on adjusted earnings, cash flow, and working capital.
- Commission a Quality of Earnings (QoE) report from an independent CPA or boutique transaction advisory firm to verify adjusted EBITDA and identify material risks
- Obtain 3–5 years of business tax returns (federal and state) and reconcile to P&L statements
- Review trailing 12-month P&L and compare to prior two full years for revenue and margin trends
- Obtain and review 12 months of business bank statements — verify deposits match reported revenue
- Review accounts receivable aging report — identify any overdue or uncollectable balances
- Review accounts payable aging — understand what the business currently owes and to whom
- Request and review the seller's add-back schedule; document and verify each item independently
- Analyze working capital: current assets minus current liabilities, and determine what's "normal" for the deal
- Review inventory records and reconcile to balance sheet (for product businesses)
- Verify that owner compensation (salary, benefits, perks) is fully disclosed and normalized
- Review payroll records and confirm headcount, roles, and compensation levels
- Identify any related-party transactions and confirm they are at market rates
Phase 2: Legal due diligence
After financial verification, legal review protects you from undisclosed liabilities, unfavorable contracts, and title issues. Engage a transaction attorney before executing the purchase agreement.
- Review all customer contracts: terms, pricing, renewal dates, cancellation rights, and assignability
- Review all vendor and supplier agreements for auto-renewals, exclusivity clauses, and change-of-control provisions
- Review lease agreements for the business premises — confirm term remaining, renewal options, and assignability
- Conduct a UCC lien search on the business and its assets
- Search for pending or threatened litigation, judgments, or regulatory actions
- Verify ownership of business name, domain, trademarks, and other intellectual property
- Review employee offer letters, NDAs, non-competes, and IP assignment agreements
- Confirm the seller has authority to sell (operating agreement, board resolutions, no right of first refusal held by partners)
- Verify all business licenses and permits are current, transferable, and not conditioned on the current owner
- Review any outstanding loans, lines of credit, or equipment financing — confirm what transfers and what gets paid off at close
Phase 3: Operational due diligence
Operational due diligence answers the question every buyer eventually faces: what actually breaks when the current owner leaves?
- Document all core business processes and identify which ones depend on the owner's personal involvement or relationships
- Meet key employees — assess retention risk, morale, and whether any are likely to leave after an ownership change
- Review organizational chart and understand who does what
- Audit the technology stack: software subscriptions, CRM, point-of-sale, accounting systems — confirm transferability and cost
- Inspect physical assets: equipment condition, vehicles, fixtures — note any deferred maintenance
- Review maintenance records and service contracts for key equipment
- Identify single-source supplier dependencies and assess risk if those relationships changed
- Confirm the seller's transition plan: how long will they stay? What will they document? What introductions will they make?
- Review insurance coverage: general liability, workers comp, professional liability — confirm what needs to be replaced or continued
Phase 4: Commercial and market due diligence
Commercial due diligence validates the growth thesis — or surfaces the risks to it. Don't skip this step because you're excited about the deal.
- Request a customer list (or a representative sample) and analyze revenue concentration by customer and by contract type
- Review customer churn data for the past 3 years — how many customers left, and why?
- Speak directly with 2–3 key customers (with seller's permission) to validate the relationship and assess continuity risk
- Research the competitive landscape — who are the main competitors, and is the business's market position strengthening or weakening?
- Review Google reviews, Yelp, Glassdoor, and other public reputation sources
- Assess the business's online presence: website traffic, social media, SEO visibility, and lead generation channels
- Validate the seller's stated growth opportunities — are they real and actionable, or marketing language?
- Confirm there are no pending regulatory changes, industry headwinds, or technology disruptions that could materially affect the business
What to do when something turns up
Due diligence findings don't automatically kill deals — they inform them. When you find something material, your first step is to understand the scope and quantify the impact. Then you have four tools:
- Price adjustment — reduce the purchase price to reflect the verified earnings or disclosed risk
- Deal structure change — add an earnout, escrow holdback, or seller note to shift risk appropriately
- Reps and warranties — require the seller to stand behind specific factual representations in the purchase agreement
- Walk away — sometimes the right answer is no deal. That decision is far less costly before close than after
Ready to go deeper? → Get independent financial verification on your next acquisition. Contact ClearView QoE to get started →