Buyer's Due Diligence: Essential Checklist

Due diligence is the systematic investigation of a target company before completing an acquisition. For buyers in the Portuguese M&A market, a thorough due diligence process is not just good practice — it's essential protection against hidden risks that can destroy deal value. The scope and depth should be proportional to the deal size and complexity, but no area should be completely overlooked.

Financial due diligence forms the foundation. Key areas include: quality of earnings analysis (separating sustainable from non-recurring income), working capital normalization (establishing the level of working capital needed to operate the business), net debt analysis (identifying all financial obligations, including off-balance-sheet items and contingent liabilities), and capital expenditure requirements (distinguishing maintenance capex from growth investment).

Tax due diligence in Portugal requires particular attention to: IRC compliance for the last four years (the statute of limitations period), IVA obligations and potential exposures, transfer pricing documentation and compliance for intercompany transactions, employee-related tax obligations (IRS withholding, Social Security contributions), and any tax litigation or pending assessments. The Portuguese Autoridade Tributária has become increasingly active in auditing mid-market companies, making tax due diligence critical.

Legal due diligence covers: corporate documentation and minute books, material contracts (customers, suppliers, landlords, key employees), real estate ownership and encumbrances, intellectual property rights and registrations, environmental compliance and potential liabilities, litigation (pending, threatened, or potential), and regulatory permits and licenses. In Portugal, particular attention should be paid to labor law compliance, as employee-related liabilities can be significant.

Commercial due diligence assesses the company's market position and growth prospects: market size and growth dynamics, competitive landscape and barriers to entry, customer concentration and contract quality, sales pipeline and revenue predictability, and key differentiators and competitive advantages. This analysis should be conducted independently of management's representations.

Red flags that should trigger deeper investigation include: significant discrepancies between management accounts and audited financials, related-party transactions at non-market terms, customer concentration above 20% with a single client, pending litigation with material potential exposure, and unusual patterns in working capital or cash flow. When red flags are identified, the buyer should adjust deal terms (price, representations, indemnification) or — in serious cases — walk away.