Buy-Side Due Diligence: What to Investigate Before Closing

Due diligence happens after you've signed a Letter of Intent (LOI) and have exclusive access to detailed information about the target. The typical diligence period is 45-90 days, during which you'll review documents, interview management, and assess every aspect of the business.

The goal isn't to find reasons to kill the deal—it's to confirm your investment thesis and identify risks that need to be addressed through price adjustments, deal structure, or post-close actions.

Key Diligence Streams

Financial Due Diligence

Verify the financial picture and understand earnings quality:

• Quality of earnings: Adjusted EBITDA, add-back verification, normalization
• Revenue analysis: By customer, product, geography; trends and drivers
• Working capital: Trends, seasonality, normalized working capital target
• Debt and debt-like items: All obligations, off-balance-sheet items
• Cash flow: Reconcile EBITDA to cash flow, understand capital requirements
• Projections: Review and stress-test management projections

Legal Due Diligence

• Corporate structure: Entity documents, ownership, jurisdictions
• Material contracts: Customer, supplier, and partnership agreements
• Litigation: Pending or threatened claims, historical patterns
• Intellectual property: Patents, trademarks, trade secrets, licenses
• Real estate: Leases, owned property, environmental issues
• Regulatory: Permits, licenses, compliance history

Tax Due Diligence

• Tax returns: Review 3-5 years of returns
• Tax positions: Aggressive positions, uncertain tax benefits
• NOLs and credits: Availability and limitations
• Transfer pricing: For companies with international operations
• State and local: Nexus, sales tax, property tax

Operational Due Diligence

• Facilities: Condition, capacity, deferred maintenance
• Equipment: Age, condition, capital needs
• Processes: Efficiency, scalability, documentation
• Systems: IT infrastructure, ERP, cybersecurity
• Quality: Defect rates, customer complaints, returns

Commercial Due Diligence

• Customer analysis: Concentration, retention, satisfaction
• Market position: Share, competition, differentiation
• Growth drivers: Pipeline, market trends, expansion opportunities
• Pricing: Power, trends, competitive positioning

HR Due Diligence

• Key employees: Identify critical talent and retention risk
• Compensation: Salary benchmarks, benefits, equity
• Employment agreements: Non-competes, change of control provisions
• Culture: Values, work environment, integration challenges
• Compliance: Employment law, benefits compliance, pending claims

Red Flags to Watch For

Financial Red Flags

• Revenue trends inconsistent with management's explanation
• Numerous or aggressive EBITDA add-backs
• High customer concentration (top customer >20%)
• Declining margins without clear explanation
• Working capital manipulation (stretching payables, pulling receivables)
• Related-party transactions at non-market terms

Legal Red Flags

• Pending or threatened material litigation
• Contracts with change-of-control provisions
• IP ownership disputes or licensing issues
• Regulatory violations or pending investigations
• Environmental liabilities or contamination

Operational Red Flags

• Deferred maintenance or capital expenditure needs
• Aging equipment approaching end of life
• Key person risk (business depends on one individual)
• Poor documentation of processes and procedures
• Cybersecurity vulnerabilities or past breaches

HR Red Flags

• Key employees without retention arrangements
• High turnover in critical positions
• Pending employment claims or EEOC issues
• Compensation significantly above or below market
• Union issues or labor disputes

Management Meetings

Document review only tells part of the story. Management meetings provide insight into how the business really operates.

Topics to Cover

• Business history: How did we get here? Key milestones and pivots?
• Strategy: Where is the business going? What's the growth plan?
• Competition: Who are the competitors? How do you win?
• Customers: Who are the key customers? How sticky are relationships?
• Operations: Walk through how work gets done
• People: Who are the key players? Who will stay?
• Challenges: What keeps you up at night? What would you change?

Assessing Management

• Are they candid about problems and challenges?
• Do their explanations match the data?
• Do they understand their business deeply?
• Would you want them leading post-acquisition?

Using Diligence Findings

Price Adjustments

Diligence findings often lead to price renegotiation:

• Quality of earnings adjustments reduce the EBITDA base
• Identified liabilities reduce enterprise value
• Capital expenditure needs are deducted
• Working capital targets are adjusted based on analysis

Deal Structure

Structure the deal to address specific risks:

• Escrow: Hold back portion of purchase price to cover potential issues
• Indemnification: Seller agrees to cover specific identified risks
• Earnout: Make portion of price contingent on future performance
• Rep & warranty insurance: Transfer certain risks to insurance

Integration Planning

Use diligence to plan integration:

• Identify Day 1 priorities based on findings
• Plan retention for key employees identified during HR diligence
• Prepare customer communication strategy
• Identify systems and process integration needs