Why sustainability reporting is converging toward finance functions, and what CSRD teams should do now

Sustainability reporting is no longer a communications exercise. According to the Governance and Accountability Institute's latest analysis, published on 26 May 2026, companies are moving ESG accountability out of standalone sustainability departments and into finance functions, where it sits alongside audit, treasury, and financial disclosure. The shift reflects a decade of pressure from investors and regulators who want sustainability data held to the same standard of rigour as financial statements. For European companies subject to the CSRD, that pressure is now codified in law.

The CSRD's double materiality requirement, and the assurance obligations that accompany it, make the case for finance ownership almost self evident. ESRS E1 climate disclosures, for instance, require companies to report Scope 1, Scope 2, and Scope 3 greenhouse gas emissions against a methodology that external auditors will scrutinise. Finance teams already own the internal controls, the audit relationships, and the legal accountability for disclosure accuracy. Placing sustainability data in a separate department creates a seam that auditors will probe and that boards increasingly see as a governance risk.

The Governance and Accountability Institute analysis frames this as a structural moment rather than a trend. For many companies, sustainability has historically been adjacent to the business rather than embedded within it, staffed by people whose reporting output carried reputational weight but no fiduciary consequence. The CSRD changes that equation entirely. Article 19a of the directive requires large companies to include sustainability statements in their management reports, placing those statements in the same legal document as their audited financial disclosures. The practical implication is that CFOs and finance controllers cannot remain at arm's length from the data their organisations produce.

The convergence creates real operational friction. Finance teams are trained to work with financial data that is transactional, precise, and sourced from systems with clear ownership. Sustainability data, particularly Scope 3 emissions from supply chains, is often estimated, sourced from third parties, and subject to methodological assumptions that accountants find uncomfortable. The gap between the rigour finance teams expect and the data quality sustainability teams can currently deliver is one of the central challenges CSRD implementation has exposed. Automated supplier engagement tools that collect primary activity data directly from value chain partners are being adopted precisely because they reduce that gap and produce audit ready records rather than estimates.

For sustainability consultants and in house ESG managers advising clients through the first CSRD reporting cycles, the Governance and Accountability Institute finding carries a practical message. The question of who owns sustainability reporting inside a company is no longer a matter of organisational preference. It is a governance design question with direct implications for assurance readiness, data lineage, and legal liability. Teams that have built their workflows around narrative reporting and stakeholder engagement will need to adapt to an environment where every number requires a documented methodology and a clear chain of custody. The companies that move fastest to integrate sustainability data into finance systems and controls will have a structural advantage as assurance requirements tighten across the EU.