Data Room Builder
M&A diligence guide

Build an M&A due diligence checklist that maps directly into your data room.

Use this buyer-oriented checklist to prepare the documents most commonly requested in an acquisition process. It is written as a room-building guide, not legal or financial advice.

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M&A due diligence checklistbuyer due diligence request listdocument checklist for selling a businesssell-side data room preparation

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Sample index

01 Corporate Records
01.01 Incorporation and constitutional documents
01.02 Shareholders, options and cap table
02 Financial Diligence
02.01 Annual financial statements
02.02 Monthly management accounts
02.03 Debt, leases and off-balance-sheet obligations
03 Tax Diligence
03.01 Tax returns
03.02 Tax audits and correspondence
04 Legal Diligence
04.01 Material contracts
04.02 Litigation and disputes
05 Commercial, HR, IT and Operations
11 min readUpdated 2026-05-31Bottom-funnel checklist search
Checklist

Use this checklist to build the room structure

  • Corporate formation documents and good-standing evidence.
  • Shareholder register, option plans, convertible instruments and cap table.
  • Audited accounts, management accounts, trial balance and accounting policies.
  • Budget, forecast, financial model and variance analysis.
  • Customer, supplier, distribution, partnership and lease contracts.
  • Employee list, contracts, compensation, benefits and HR policies.
  • Tax returns, audits, correspondence and deferred tax analysis.
  • IT systems, cybersecurity policies, data protection and disaster recovery materials.
  • Insurance policies, claims history and material operational permits.

Start from buyer questions, not folder names

A buyer is trying to understand ownership, earnings quality, cash generation, customer risk, liabilities, people risk and execution risk. The checklist should therefore be structured around the questions that drive price, terms and completion risk.

Financial diligence documents

Financial diligence usually consumes the most time. Keep the documents reconciled and clearly named.

  • Audited accounts and monthly management accounts.
  • Revenue by product, geography, customer and contract type.
  • Gross margin, EBITDA adjustments and one-off items.
  • Working capital, debt, lease liabilities and commitments.
  • Forecast assumptions, budget packs and board reporting.

Legal and contract diligence documents

Legal diligence focuses on ownership, authority, contractual rights and liabilities. Material contracts should be separated by type so reviewers do not have to search through an undifferentiated dump.

How Data Room Builder helps

Turn the checklist into an Excel request list, upload it to Data Room Builder, preview the hierarchy and export the skeleton before the collection process starts.

Convert this guide into folders

Create the folder structure instead of building it by hand.

Paste the checklist into Excel or start from the sample file, then use Data Room Builder to generate the hierarchy and export a clean ZIP skeleton.

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FAQs

What documents are requested in M&A due diligence?

Buyers commonly request corporate records, financial statements, tax returns, material contracts, HR documents, customer data, supplier information, IP records, IT/security policies, insurance and litigation materials.

When should a seller prepare the data room?

Ideally before buyer outreach. Preparing early lets the seller identify missing documents, reconcile inconsistencies and avoid delays once diligence starts.

Should every buyer see the same documents?

Not always. Sensitive information may be staged by diligence phase and permission group. The structure can stay consistent while access is controlled by buyer, adviser or workstream.