Due Diligence Checklist for M&A Transactions
Due diligence is where deals get confirmed — or fall apart. This checklist covers the areas buyers investigate most thoroughly in lower-middle-market transactions.
Key Takeaways
- ✓Financial diligence focuses on validating the Adjusted EBITDA and revenue quality
- ✓Legal diligence surfaces liabilities, IP issues, and contract risks
- ✓Commercial diligence assesses market position and customer retention
- ✓Sellers who prepare diligence materials in advance close faster and with fewer surprises
In this guide
1Financial due diligence
3-5 years of financial statements (CPA-prepared preferred, audited for larger deals)
Monthly revenue breakdown by customer or product line
Adjusted EBITDA reconciliation with all add-backs documented
AR/AP aging reports — aging receivables signal collection problems
Tax returns for 3 years
Bank statements for 12-24 months
Revenue backlog or contracted revenue detail
Capital expenditure history and forward requirements
Quality of Earnings (QoE) reports — prepared by an independent accounting firm — have become standard for deals above $5M. Sellers who commission a sell-side QoE before launching a process reduce diligence delays significantly.
2Legal due diligence
Corporate documents — articles of incorporation, operating agreement, cap table
All material contracts — customer, vendor, lease, loan agreements
IP ownership documentation — trademarks, patents, copyrights, software ownership
Employment agreements for key personnel
Non-compete and non-solicitation agreements
Litigation history and any pending claims
Regulatory compliance — licenses, permits, industry-specific requirements
Data privacy compliance (GDPR, CCPA if applicable)
3Operational and commercial diligence
Customer list with revenue concentration analysis
Customer retention data — churn rate, average tenure
Supplier concentration — dependency on key vendors
Technology stack documentation
Organizational chart and key employee profiles
Management team references (for larger deals)
Sales pipeline and CRM data
Competitive landscape analysis
4How sellers can prepare
Sellers who organize diligence materials before the process launches close deals faster and with fewer price renegotiations. The practical approach: build a virtual data room early, populate it by category, and have your advisor review it for gaps before any buyer gets access.
Items that are missing or hard to find in diligence create uncertainty. Buyers treat uncertainty as risk, and they price risk into their offer. A tidy, well-organized data room is one of the less obvious things that affects final deal price.
Never withhold material information in diligence. Buyers who discover undisclosed issues post-LOI almost always renegotiate price — and sometimes walk entirely.
Track Due Diligence Items with VDR Kanban
AI Valuation Insight includes a VDR Kanban board to help advisors track diligence task status for each client engagement.
See VDR Kanban