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M&A Due Diligence Checklist for Business Sellers

Every document a buyer will request during confirmatory due diligence – organized by category, with guidance on what matters most and how to prepare.
Published by Parkland Capital Partners · Updated 2026

5

Document Categories

50+

Checklist Items

4 – 8 wk

Typical DD Period

Pre-LOI

Ideal Prep Timing

Financial Documents

  • Three years of audited or reviewed financial statements
  • Trailing twelve-month P&L with monthly detail
  • Balance sheet as of the most recent month-end
  • Cash flow statements (3 years)
  • Revenue breakdown by service line and customer
  • Add-back schedule with supporting documentation
  • Accounts receivable and payable aging reports
  • Capital expenditure history and projections
  • Tax returns - federal and state (3 years)
  • Budget and financial projections
  • Bank statements (12 months)

Legal & Corporate

  • Articles of incorporation / operating agreement
  • All amendments to corporate documents
  • Good standing certificates
  • Shareholder or member agreements
  • All management agreements and service contracts
  • Vendor and supplier agreements
  • Office lease agreements
  • Insurance policies and claims history
  • Pending or threatened litigation
  • Regulatory licenses and certifications
  • Intellectual property registrations
  • Non-compete and non-solicitation agreements

Operations & Technology

  • Organizational chart with reporting structure
  • Technology systems and software inventory
  • Standard operating procedures documentation
  • Property/unit count and growth history (if applicable)
  • Customer retention and churn data
  • Marketing strategy and customer acquisition costs
  • Key performance indicators and dashboards
  • Maintenance and vendor management processes
  • Quality assurance and compliance programs
  • Business continuity and disaster recovery plans

Customer & Contract Data

  • Complete client list with revenue by client
  • Top 20 customers by revenue with contract terms
  • Contract renewal schedule and expiration dates
  • Customer concentration analysis
  • Customer satisfaction data or survey results
  • Pricing history and rate increase schedule
  • Pipeline of new business opportunities
  • Lost customer analysis (past 2 years)
  • Referral sources and partnership agreements

HR & People

  • Employee roster with titles, tenure, and compensation
  • Benefits summary and enrollment data
  • Employee handbook and policies
  • Employment agreements for key personnel
  • Workers' compensation history
  • Open positions and hiring plans
  • Training and development programs
  • Turnover data by department
  • Contractor and 1099 relationships
  • Succession plan for key roles

Need Help Preparing?

Parkland Capital Partners guides sellers through every stage of due diligence preparation – from financial normalization to data room organization.
Schedule a Confidential Call

Frequently Asked Questions

Common questions about due diligence preparation.
When should I start preparing due diligence materials?
Ideally, 6 – 12 months before going to market. Having a well-organized virtual data room before buyer outreach begins demonstrates professionalism, accelerates the process, and prevents surprises that can delay or derail a deal.
Audited financials strengthen your position with institutional buyers but are not required for most lower middle market transactions. At minimum, you should have reviewed or compiled statements from a CPA firm, plus clean internal reporting with documented add-backs.
A secure, cloud-based repository where you organize and share confidential documents with qualified buyers. Access is controlled and tracked, ensuring you know exactly who has viewed what information.
Financial statements, add-back documentation, management contracts (especially assignability and termination provisions), customer concentration data, and employee agreements. These are typically the first items requested and most carefully analyzed.

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