Due diligence is the phase of a business sale where buyers verify everything you've told them. It is comprehensive, time-consuming, and stressful. The best way to manage it is to be prepared — having every document organized and ready before buyers ask for it.
This is the complete due diligence checklist for business sellers. Use it to build your virtual data room before going to market.
Why Due Diligence Preparation Matters
Unprepared sellers create delays, signal disorganization, and give buyers reasons to reduce the purchase price. Every week of due diligence delays is a week of uncertainty, distraction from running the business, and risk that the deal will fall apart.
Prepared sellers:
- Close faster (less time in due diligence)
- Maintain credibility with buyers
- Reduce the risk of price reductions based on due diligence findings
- Reduce legal costs (less back-and-forth on document requests)
The goal is to have 80-90% of the due diligence documents organized in your virtual data room before you sign the LOI. The remaining 10-20% will be specific requests that you can't anticipate.
The Due Diligence Checklist
Category 1: Corporate and Legal Documents
Entity documents:
- Articles of incorporation / Certificate of formation
- Operating agreement / Bylaws
- Amendments to any of the above
- Good standing certificates (current)
- Foreign qualification documents (if operating in multiple states)
Ownership and equity:
- Cap table (current and historical)
- Stock certificates or membership interest certificates
- Any options, warrants, or convertible instruments
- Stockholder agreements / Operating agreements
- Buy-sell agreements
- Right of first refusal agreements
Board and governance:
- Board minutes (last 3 years)
- Shareholder meeting minutes (last 3 years)
- Written consents in lieu of meetings
- Board resolutions
Corporate history:
- Prior acquisitions (purchase agreements, integration documents)
- Prior divestitures
- Prior financing rounds
- Any prior M&A activity
Category 2: Financial Documents
Financial statements:
- Audited or reviewed financial statements (last 3 years)
- Year-to-date financial statements (current year)
- Monthly management accounts (last 24 months)
- Quarterly financial summaries
Tax returns:
- Federal tax returns (last 3 years)
- State tax returns (last 3 years)
- Any tax notices, audits, or correspondence with tax authorities
- Sales tax filings and any audits
Financial analysis:
- Adjusted EBITDA bridge with documentation for each add-back
- Revenue by customer (last 3 years)
- Revenue by product/service line (last 3 years)
- Gross margin by product/service line
- Monthly revenue and EBITDA (last 24 months)
Accounts receivable:
- Aged accounts receivable report (current)
- Bad debt history and write-offs
- Collection policies and procedures
- Any disputed receivables
Accounts payable:
- Aged accounts payable report (current)
- Payment terms with key suppliers
- Any disputed payables
Debt and liabilities:
- All loan agreements, credit facilities, and notes payable
- Personal guarantees
- Capital lease obligations
- Off-balance-sheet liabilities
- Contingent liabilities
Capital expenditures:
- Capex history (last 3 years)
- Capex budget (current year and next year)
- Fixed asset schedule
Working capital:
- Working capital analysis (last 12 months)
- Seasonal working capital patterns
- Working capital cycle analysis
Category 3: Customer and Revenue Documents
Customer information:
- Top 20 customers by revenue (last 3 years)
- Customer concentration analysis
- Customer retention rates (last 3 years)
- Customer acquisition costs
- Customer lifetime value analysis
Customer contracts:
- All material customer contracts (typically top 10-20 customers)
- Standard customer contract template
- Any contracts with unusual terms (exclusivity, most-favored-nation, termination rights)
- Any contracts that require consent to assign
Sales pipeline:
- Current sales pipeline
- Pipeline conversion rates
- Backlog (if applicable)
- Signed but not yet started contracts
Revenue analysis:
- Revenue by geography
- Revenue by channel
- Recurring vs. non-recurring revenue breakdown
- Subscription metrics (if applicable): MRR, ARR, churn rate, NRR
Category 4: Supplier and Vendor Contracts
Key supplier contracts:
- All material supplier contracts
- Any sole-source supplier relationships
- Any contracts that require consent to assign
- Any contracts with unusual terms (exclusivity, minimum purchase commitments)
Supplier concentration:
- Top 10 suppliers by spend
- Any single-source suppliers
- Supplier financial stability assessment
Other vendor contracts:
- Software licenses (key business systems)
- IT service agreements
- Marketing and advertising contracts
- Professional service agreements (accounting, legal, HR)
Category 5: Employee and HR Documents
Employee roster:
- Complete employee roster with titles, compensation, and tenure
- Organizational chart
- Key employee identification
Employment agreements:
- Offer letters for all employees
- Employment agreements for key employees
- Non-compete agreements
- Non-solicitation agreements
- IP assignment agreements
- Confidentiality agreements
Compensation and benefits:
- Compensation structure (salary, bonus, commission)
- Bonus plans and commission structures
- Equity plans (options, restricted stock)
- Benefits summary (health, dental, vision, 401k)
- 401k plan documents and compliance
HR compliance:
- Employee handbook
- HR policies and procedures
- EEOC compliance documentation
- Workers' compensation history
- OSHA compliance documentation
- Any pending or threatened employment claims
Payroll:
- Payroll records (last 2 years)
- Payroll tax filings
- Any payroll tax issues or audits
Category 6: Intellectual Property
Patents:
- All patents (granted and pending)
- Patent assignments
- Patent licenses (in and out)
- Freedom to operate opinions
Trademarks:
- All registered trademarks
- Trademark applications
- Trademark licenses
- Domain name registrations
Copyrights:
- Key copyrights
- Copyright registrations
- Copyright licenses
Trade secrets:
- Description of key trade secrets
- Trade secret protection policies
- Non-disclosure agreements with employees and contractors
Software:
- All proprietary software
- Open source software usage and compliance
- Software licenses (in and out)
- Third-party code usage
IP ownership:
- Confirmation that all IP is owned by the company (not the founder personally)
- IP assignments from founders, employees, and contractors
- Any IP disputes or claims
Category 7: Real Estate and Facilities
Owned real estate:
- Deeds and title documents
- Mortgage documents
- Environmental assessments
- Property tax records
Leased real estate:
- All lease agreements
- Lease amendments
- Sublease agreements
- Any leases that require landlord consent to assign
- Security deposits
Facilities:
- Facility condition assessment
- Deferred maintenance
- Capital improvement plans
Category 8: Insurance
Insurance policies:
- General liability
- Professional liability (E&O)
- Directors and officers (D&O)
- Cyber liability
- Property and casualty
- Workers' compensation
- Key man life insurance
- Any other material policies
Claims history:
- Insurance claims history (last 5 years)
- Any pending claims
- Any claims that have been denied
Category 9: Legal and Compliance
Litigation:
- All pending or threatened litigation
- All settled litigation (last 5 years)
- All regulatory investigations or proceedings
- Any consent decrees or settlement agreements
Regulatory compliance:
- All licenses and permits required to operate
- Compliance with all applicable regulations
- Any regulatory violations or investigations
- Environmental compliance documentation
Government contracts:
- Any government contracts
- Government contract compliance
- Any debarment or suspension proceedings
Category 10: Technology and IT
Technology infrastructure:
- IT systems inventory
- Software licenses
- Hardware inventory
- Cloud services and subscriptions
- Cybersecurity policies and procedures
- Data backup and disaster recovery plans
Data and privacy:
- Data inventory (what data is collected, stored, processed)
- Privacy policy
- GDPR/CCPA compliance documentation
- Data breach history
- Cybersecurity incident history
Technology roadmap:
- Current technology projects
- Technology investment plans
- Technical debt assessment
How to Organize Your Virtual Data Room
Organize your VDR to match the due diligence checklist categories. Standard VDR structure:
01 - Corporate Documents
02 - Financial Documents
03 - Customer and Revenue
04 - Supplier and Vendor Contracts
05 - Employee and HR
06 - Intellectual Property
07 - Real Estate and Facilities
08 - Insurance
09 - Legal and Compliance
10 - Technology and IT
Best practices:
- Use consistent file naming (date_document-name.pdf)
- Redact sensitive information (customer names, employee SSNs) until post-LOI
- Track document access (who viewed what and when)
- Update documents regularly (don't let the VDR go stale)
- Have a single point of contact for document requests
The Due Diligence Timeline
| Phase | Timing | Key Activities |
|---|
| Pre-LOI | Before signing LOI | Prepare VDR, organize documents |
| Post-LOI, Week 1-2 | After LOI signing | Buyer reviews VDR, submits initial requests |
| Post-LOI, Week 2-4 | Due diligence | Management interviews, site visits, QoE review |
| Post-LOI, Week 4-6 | Deep due diligence | Legal review, customer calls, employee interviews |
| Post-LOI, Week 6-8 | Closing preparation | Purchase agreement negotiation, final document requests |
Key Takeaways
- Prepare your VDR before going to market — having 80-90% of documents ready before the LOI dramatically accelerates due diligence.
- Organize by category — buyers expect a well-organized VDR; disorganization signals risk.
- Stage the disclosure of sensitive information — redact customer names and employee details until post-LOI.
- Track document access — know who has viewed what and when.
- Update documents regularly — stale documents create questions and delays.
- Have a single point of contact — designate one person to manage document requests and buyer communication.
If you're preparing to sell your business and want guidance on building your VDR, Deal Flow's team can help. Start the conversation here.