M&A Due Diligence Checklist: What Buyers Will Examine
Due diligence is where deals are made or broken. Knowing what buyers will scrutinize — and preparing for it in advance — can mean the difference between a smooth closing and a failed transaction.
Definition
Due diligence is the comprehensive investigation a buyer conducts after signing a Letter of Intent. It covers financial records, legal matters, operations, customers, employees, contracts, intellectual property, and regulatory compliance. The goal is to verify the seller's representations and identify risks that could affect valuation or deal terms.
Financial Due Diligence
Buyers will examine 3-5 years of financial statements, tax returns, accounts receivable/payable aging, revenue by customer, gross margin analysis, working capital trends, capital expenditure history, and debt schedules. They'll look for add-backs, owner adjustments, and one-time items that affect normalized EBITDA. A Quality of Earnings (QoE) report from an independent accounting firm is standard in transactions above $5M.
Legal & Compliance Due Diligence
This covers corporate formation documents, contracts (customer, vendor, lease, employment), pending or threatened litigation, regulatory compliance history, permits and licenses, intellectual property registrations, and insurance policies. Any material legal issues discovered can delay closing or trigger purchase price adjustments.
Operational Due Diligence
Buyers assess the business's operational infrastructure: key processes and SOPs, technology systems, supply chain dependencies, facility conditions, equipment maintenance records, and organizational structure. They're evaluating whether the business can operate independently of the owner and scale under new management.
Customer & Market Due Diligence
Customer concentration is one of the biggest deal-killers in M&A. Buyers analyze revenue by customer, contract terms, renewal rates, customer acquisition costs, churn, and competitive positioning. If any single customer represents more than 15-20% of revenue, expect heightened scrutiny and potential risk-mitigation structures like earnouts.
How to Prepare
Start preparing 12-18 months before going to market. Organize a virtual data room with all documents categorized. Address known issues proactively — resolve pending legal matters, clean up financial records, document key processes, and reduce customer concentration where possible. Sellers who are well-prepared experience faster closings, fewer purchase price reductions, and stronger negotiating positions.
Common Questions
Frequently Asked Questions
How long does due diligence take?
Due diligence typically takes 60-90 days for lower middle market transactions ($3M–$50M). Complex businesses or those with regulatory requirements may take longer. Well-prepared sellers can accelerate the timeline significantly.
What kills deals during due diligence?
Common deal-killers include undisclosed liabilities, customer concentration above 20%, declining financial trends, key person dependency, regulatory non-compliance, and significant discrepancies between represented and actual financial performance.
Should I prepare a data room before going to market?
Absolutely. Having a well-organized virtual data room ready before engaging buyers demonstrates professionalism, accelerates the process, and reduces the risk of deal fatigue. An M&A advisor can provide a detailed data room checklist.
Need Expert M&A Guidance?
Every conversation is confidential. No obligation.
Schedule Advisory Consultation