ESG Due Diligence
Environmental, Social and Governance compliance is no longer a branding exercise. In 2026, missed climate commitments or undisclosed labor problems in the supply chain routinely trigger deal renegotiations — and, in serious cases, outright cancellation of the transaction. ESG due diligence has moved from the periphery of M&A practice to its legal core.
From reporting add-on to legal obligation
The turning point is regulatory. The EU’s Corporate Sustainability Due Diligence Directive (CSDDD) establishes binding duties for in-scope companies to identify, prevent and remedy adverse human rights and environmental impacts across their own operations, subsidiaries and global value chains. The Corporate Sustainability Reporting Directive (CSRD) adds mandatory, auditable disclosure on top. 2026 brought a significant recalibration. The EU’s “Omnibus I” simplification package — completed by Directive (EU) 2026/470, in force since March 2026 — raised the applicability thresholds, extended compliance timelines (CSDDD transposition by mid-2028, application from mid-2029) and trimmed certain requirements, including mandatory climate transition plans. Fewer companies are now formally in scope. The legal substance, however, survived the simplification. The core duty to conduct riskbased environmental and human rights due diligence remains, backed by administrative orders and fines for non-compliance. And companies that fall outside the directives do not escape the regime in practice: in-scope counterparties push due diligence obligations down the value chain through contractual clauses, supplier codes and information requests. For most businesses trading with the EU, ESG due diligence is becoming a condition of doing business rather than a question of legal scope.
What ESG due diligence covers in 2026
Modern ESG due diligence in transactions has expanded well beyond environmental permits and emissions data. A defensible review now typically examines:
- Supply chain integrity — mapping of direct and indirect suppliers for forced labor, child labor and other human rights risks, increasingly down to Tier-N level;
- Employment and social matters — working conditions, pay equity, collective relations and organisational culture, often framed as “HR due diligence”;
- Governance structures — board composition and independence, anti-corruption and whistleblowing frameworks, past litigation and regulatory history;
- Data privacy and cybersecurity — now treated as a core governance item rather than a separate technical workstream;
- Public sustainability claims — verifying that marketing statements match operational reality, as greenwashing litigation and enforcement intensify across jurisdictions.
Where ESG meets the deal documents
For lawyers, the real significance of ESG due diligence lies in how its findings are translated into the transaction architecture. ESG risks now shape:
- Representations and warranties — sellers are asked to stand behind specific environmental, labor and supply-chain statements;
- Price and structure — identified deficiencies feed into purchase price adjustments, escrows, earn-outs or conditions precedent requiring remediation before closing;
- Liability allocation — indemnities, liability caps and warranty & indemnity (W&I) insurance coverage are negotiated with ESG exposure expressly in mind;
- Walk-away rights — material ESG findings increasingly support termination or material adverse change arguments.
A deficiency that would once have produced a paragraph in a diligence report can now reprice a deal - or stop it.
Director and management exposure
ESG due diligence is also a board-level liability question. Evolving regulation raises the standard of care expected from directors and management when approving transactions: a board that waves through an acquisition without a documented assessment of ESG risk is harder to defend than one with a clear diligence record. Thorough documentation of the review, the findings and the mitigation decisions has become an essential part of governance hygiene — for buyers and sellers alike.
The outlook
The direction of travel for 2026–2027 is clear. Even as the EU narrows the formal scope of its sustainability directives, enforcement, litigation and market expectations continue to broaden the practical one. Value-chain transparency is shifting from best practice to baseline expectation, and ESG findings are pricing into deals as predictably as tax or litigation exposure. The legal task, accordingly, is no longer to recite the regulatory framework. It is to identify the business-critical ESG risks of a specific target, quantify them, and embed them into the structure of the transaction — early enough that they inform the deal rather than derail it.