What is Due Diligence? Process & Checklist

Due diligenceis the buyer’s most important protection in any acquisition. It is the structured process of examining every material aspect of a business before signing the final purchase agreement. The old adage applies: trust, but verify.

A thorough due diligence process answers three fundamental questions: Is the business what the seller says it is? What are the risks we are inheriting? Should we proceed on the current terms, or do we need to adjust price, structure, or conditions?

Types of Due Diligence

• Financial Due Diligence: Reviews historical and projected financial statements, quality of earnings, working capital, debt, tax compliance, and accounting policies. This is the most intensive area for most transactions.
• Legal Due Diligence: Examines corporate structure, contracts, litigation history, intellectual property, regulatory licenses, and compliance with applicable laws.
• Operational Due Diligence: Assesses facilities, equipment, supply chain, IT systems, and key processes. Identifies operational risks and integration challenges.
• Commercial Due Diligence: Analyzes the market, competitive position, customer concentration, sales pipeline, and growth prospects. Validates the revenue story.
• HR Due Diligence: Reviews employee agreements, compensation, benefits, organizational structure, culture, and retention risks for key personnel.

The Due Diligence Process

The process begins after the letter of intent is signed. The buyer creates a due diligence checklist and requests documents through a virtual data room (VDR). The seller populates the data room, and the buyer’s team reviews the materials, flags issues, and follows up with additional questions. Weekly calls track progress. At the end of the period, the team produces a due diligence report summarizing findings, risks, and recommended adjustments to the deal terms.

Due Diligence Checklist Essentials

A standard checklist covers: 3–5 years of financial statements and tax returns, customer list with revenue concentration analysis, material contracts and key supplier agreements, employee list with compensation and contracts, intellectual property registrations and licenses, real estate leases or ownership documents, insurance policies and claims history, regulatory permits and compliance records, and IT infrastructure and cybersecurity documentation. Every checklist should be tailored to the specific industry and deal structure.

How Ali Sedighi Can Help

Ali Sedighi leads and manages due diligence processes for buyers and investors. He coordinates the cross-functional team, builds the checklist, reviews findings, and provides clear go/no-go recommendations. His experience spans financial, operational, and commercial diligence across dozens of transactions.

Learn more about Business Acquisition or contact Ali for due diligence support. Explore our Business Consulting services for broader advisory.

Frequently Asked Questions

How long does due diligence take?

The due diligence period typically lasts 30 to 90 days, depending on the size and complexity of the transaction. A small business acquisition with clean financials might be completed in 2 to 4 weeks. A mid-market deal with multiple entities, international operations, or regulatory considerations often takes 60 to 90 days or longer.

Who conducts due diligence?

Due diligence is typically conducted by a cross-functional team. External accountants review financial statements and tax positions. Lawyers examine contracts, intellectual property, and regulatory compliance. Industry experts or consultants evaluate operations, technology, and market position. The buyer’s internal management team oversees the process and makes the final go/no-go decision.

What happens if due diligence uncovers problems?

Problems found in due diligence are not automatically deal-breakers. The buyer can renegotiate the purchase price, request that the seller fix specific issues before closing, adjust the deal structure (e.g., holdbacks or earn-outs), or add representations and warranties to the purchase agreement. If the issues are fundamental, the buyer may terminate the deal if the LOI includes a due diligence contingency.