M&A Resource

M&A Due Diligence Checklist

171 items organized by category to ensure thorough investigation of your acquisition target. Never miss a critical document or question.

171
Total Items
104
Critical Items
8
Categories
View Full Checklist Jump to Category

What Is Due Diligence in M&A?

Due diligence is the comprehensive investigation a buyer conducts before completing an acquisition. It's the process of verifying everything the seller has represented about the business-and uncovering what they haven't disclosed.

Think of due diligence as a thorough home inspection before buying a house-except the "house" is an entire business with employees, contracts, legal obligations, and hidden risks. Inadequate due diligence is responsible for 31% of M&A failures.

Verify Claims

Confirm that the seller's representations about revenue, customers, and operations are accurate.

Identify Risks

Uncover hidden liabilities, pending litigation, customer concentration, and other deal-breakers.

Protect Investment

Inform deal structure, negotiate protections, and know what you're buying before closing.

Who Conducts Due Diligence?

1
M&A Attorneys
Legal DD: contracts, corporate docs, litigation, compliance
2
CPAs / Financial Advisors
Financial DD: statements, taxes, quality of earnings
3
Industry Consultants
Operational DD: processes, market, competitive analysis
4
Buyer's Internal Team
Coordination, integration planning, cultural assessment

Jump to Category

Financial Due Diligence (25) Legal Due Diligence (26) Operational Due Diligence (20) Human Resources Due Diligence (25) Technology & IT Due Diligence (25) Commercial Due Diligence (20) Environmental Due Diligence (15) Regulatory & Compliance Due Diligence (15)

Complete Due Diligence Checklist

171 items across 8 categories. Items marked with Critical are essential for every transaction.

Financial Due Diligence

Review financial statements, accounting practices, and fiscal health

25
items
Audited financial statements (3 years)
Critical
Unaudited monthly financials (24 months)
Critical
Federal and state tax returns (3 years)
Critical
Quality of earnings analysis
Critical
Accounts receivable aging report
Critical
Accounts payable aging report
Revenue recognition policies
Critical
Deferred revenue schedule
Working capital analysis
Critical
Capital expenditure history and projections
Debt schedule with terms and covenants
Critical
Bank statements (12 months)
Inventory valuation and aging
Fixed asset register
Chart of accounts
Intercompany transactions and balances
Related party transactions
Critical
Contingent liabilities and off-balance-sheet items
Critical
Insurance policies and claims history
Budget vs. actual variance analysis
Financial projections and assumptions
Critical
Cash flow statements and projections
Critical
Break-even analysis
Gross margin analysis by product/service
EBITDA adjustments and add-backs
Critical

Operational Due Diligence

Review business operations, facilities, and processes

20
items
Organization chart
Critical
Business process documentation
Facilities list with square footage
Critical
Equipment and machinery list
Maintenance and repair records
Production capacity analysis
Quality control procedures
Critical
Product/service delivery processes
Supply chain overview
Critical
Vendor concentration analysis
Critical
Inventory management systems
Logistics and distribution network
Key operational metrics and KPIs
Critical
Capacity utilization rates
Backlog and order pipeline
Critical
Product roadmap and development pipeline
Manufacturing agreements
Warranties and returns history
Critical
Business continuity and disaster recovery plans
Critical
Standard operating procedures (SOPs)

Human Resources Due Diligence

Review employees, compensation, benefits, and workplace matters

25
items
Employee census with titles and tenure
Critical
Executive team biographies
Critical
Employment agreements (key employees)
Critical
Compensation structure and salary ranges
Critical
Bonus and incentive plans
Critical
Commission structures
Health and welfare benefit plans
Critical
Retirement and pension plans
Critical
Stock option and equity compensation plans
Critical
Employee handbook and policies
Offer letter templates
Severance policies and agreements
Critical
Non-compete agreements (employees)
Critical
Non-disclosure agreements (employees)
Independent contractor agreements
Critical
Contractor vs. employee classification review
Critical
Union agreements and labor relations
Critical
OSHA compliance and workplace safety records
Workers' compensation claims history
Employee turnover statistics
Critical
Pending employment claims or litigation
Critical
I-9 and work authorization compliance
Critical
Key person risk assessment
Critical
Succession planning
Training and development programs

Technology & IT Due Diligence

Review technology systems, intellectual property, and cybersecurity

25
items
IT infrastructure overview
Critical
Software and systems inventory
Critical
Software license agreements
Critical
Cloud service agreements (AWS, Azure, etc.)
Critical
SaaS subscriptions and contracts
Data architecture and database documentation
API integrations and dependencies
Source code ownership and access
Critical
Technology development roadmap
Patent portfolio
Critical
Patent applications pending
Trademark registrations
Critical
Copyright registrations
Trade secrets inventory
Critical
IP assignment agreements
Critical
Open source software usage
Critical
Cybersecurity policies and procedures
Critical
Data breach history
Critical
Penetration testing results
SOC 2 or security audit reports
Critical
Data privacy policies (GDPR, CCPA)
Critical
IT disaster recovery plan
Critical
System uptime and reliability metrics
Technical debt assessment
IT budget and spending history

Commercial Due Diligence

Review customers, market position, and competitive landscape

20
items
Customer list with revenue by customer
Critical
Customer concentration analysis
Critical
Customer retention and churn rates
Critical
Customer satisfaction scores (NPS, CSAT)
Sales pipeline and forecasting
Critical
Win/loss analysis
Pricing strategy and history
Critical
Discount policies and practices
Sales compensation and incentives
Marketing strategy and budget
Brand and trademark assets
Critical
Website analytics and traffic data
Market size and growth analysis
Critical
Competitive landscape analysis
Critical
Market share estimates
Industry trends and outlook
Regulatory environment impact
Critical
Geographic market coverage
Channel partner relationships
Customer reference calls (5-10)
Critical

Environmental Due Diligence

Review environmental compliance, permits, and potential liabilities

15
items
Environmental permits and licenses
Critical
Environmental compliance history
Critical
Phase I Environmental Site Assessment
Critical
Phase II Assessment (if triggered)
Critical
Hazardous materials handling procedures
Critical
Waste disposal practices and records
Air and water discharge permits
Underground storage tank records
Critical
Asbestos and lead paint surveys
Contamination remediation history
Critical
EPA or state agency correspondence
Critical
Environmental insurance policies
Sustainability and ESG programs
Carbon footprint and emissions data
Environmental litigation history
Critical

Regulatory & Compliance Due Diligence

Review regulatory compliance, licenses, and government relations

15
items
Business licenses and permits
Critical
Professional licenses (if applicable)
Critical
Industry-specific regulatory compliance
Critical
FDA, FCC, or other agency approvals
Critical
Import/export licenses and compliance
Government contracts and compliance
Critical
Anti-corruption and FCPA compliance
Critical
Anti-money laundering (AML) compliance
Data privacy and protection compliance
Critical
HIPAA compliance (if applicable)
Critical
PCI DSS compliance (if applicable)
Critical
SEC filings and compliance (if public)
Critical
Regulatory examination history
Critical
Consent orders or regulatory settlements
Critical
Lobbying and political contributions

How to Use This Due Diligence Checklist

1

Customize for Your Deal

Not every item applies to every transaction. Remove items that don't apply to your target's industry or size. Add industry-specific items as needed.

2

Prioritize Critical Items

Start with items marked "Critical"-these are must-haves for every deal. They often reveal deal-breakers or major valuation adjustments.

3

Assign Workstreams

Divide the checklist among your deal team. Attorneys handle legal, CPAs handle financial, and your internal team coordinates everything.

4

Track in Data Room

Use your virtual data room's checklist feature to track which documents have been provided, reviewed, and flagged for follow-up.

Pro Tip: The Checklist Is Just the Start

A checklist ensures you don't miss obvious items, but thorough due diligence requires follow-up questions, verification of claims, and judgment about what the documents reveal. The checklist gets you documents-analysis turns them into insights.

Common Due Diligence Mistakes to Avoid

Rushing the Process

Compressing DD to under 45 days to meet arbitrary deadlines. Speed kills deals. Allow 60-90 days minimum for middle-market transactions.

Accepting Documents at Face Value

Getting the documents is step one. Verifying their accuracy through third-party confirmation, customer calls, and independent analysis is the actual work.

Ignoring Cultural Fit

Focusing exclusively on financials and legal issues while ignoring management style, employee culture, and integration challenges. 30% of integration failures cite cultural clash.

Not Talking to Customers

Relying on seller-provided customer data without conducting reference calls. Direct customer conversations reveal satisfaction, contract stability, and competitive threats.

Skipping Quality of Earnings

Trusting financial statements without independent QoE analysis. QoE reveals adjusted EBITDA, sustainability of earnings, and working capital true-ups that affect valuation.

Related Due Diligence Resources

Buyer's Guide to Due Diligence

Complete walkthrough of the DD process from LOI to closing

Due Diligence Red Flags

Warning signs that should make you walk away from a deal

Acquisition Timeline Guide

How long DD takes and what happens at each phase

M&A Failure Rate Statistics

31% of failures trace back to inadequate DD

Frequently Asked Questions

What is a due diligence checklist?
A due diligence checklist is a comprehensive list of documents, information, and questions that buyers use to investigate a target company before completing an acquisition. It ensures systematic review of all material aspects of the business including finances, legal matters, operations, employees, technology, and compliance.

How many items should be on a due diligence checklist?
A thorough M&A due diligence checklist typically contains 100-200+ items, organized by category. The exact number depends on deal complexity, industry, and company size. Small deals may require 75-100 items, while complex transactions may need 300+ items across specialized workstreams.

What are the main categories of due diligence?
The main due diligence categories are: Financial (statements, taxes, working capital), Legal (contracts, litigation, compliance), Operational (facilities, processes, supply chain), Human Resources (employees, benefits, key person risk), Technology/IT (systems, IP, cybersecurity), Commercial (customers, market, competition), and Environmental (permits, contamination, compliance).

Who is responsible for due diligence in M&A?
The buyer is primarily responsible for conducting due diligence, though the seller must provide requested information. Buyers typically engage specialists: M&A attorneys for legal DD, CPAs for financial DD, and industry consultants for operational DD. The buyer's deal team coordinates all workstreams.

How long does due diligence take?
Due diligence typically takes 6-12 weeks for middle-market deals. Small deals may complete in 4-6 weeks, while large or complex transactions can require 12-16+ weeks. Rushing below 45 days significantly increases risk-research shows deals with adequate DD time have 34% higher success rates.

What happens if due diligence finds problems?
When due diligence uncovers issues, buyers have several options: renegotiate the purchase price, require seller representations and warranties, demand escrow holdbacks for specific risks, include indemnification provisions, require issues to be resolved pre-closing, or walk away from the deal entirely.

What is a data room in M&A?
A data room (typically a virtual data room or VDR) is a secure online repository where sellers upload documents for buyer review during due diligence. Data rooms track who accesses what documents, maintain version control, and allow Q&A between parties. Common providers include Intralinks, Merrill, and Firmex.

What are common due diligence red flags?
Common red flags include: customer concentration over 20% with one client, key person dependencies, declining revenue trends, pending litigation, regulatory compliance gaps, off-balance-sheet liabilities, inconsistent financial records, high employee turnover, and reluctance to provide requested documents.

Need Help with Due Diligence?

A checklist is just the start. Acquisition Stars provides legal counsel for buyers navigating the due diligence process-from document review to issue negotiation to closing.

Request Engagement Assessment Read Our DD Guide

This checklist is for educational purposes and general guidance. Every transaction is different-some items may not apply, and industry-specific items may need to be added. Consult with qualified legal, financial, and industry advisors for due diligence specific to your transaction.