EU ESRS: European Sustainability Reporting Standards

Status, September 2026: The EU's Omnibus I directive (in force March 18, 2026) narrows the CSRD to companies with more than 1,000 employees and more than €450 million in net turnover. The amendments apply from financial year 2027, with first reports in 2028, and member states must transpose them by March 2027. Source: Council of the EU.

What It Is

The European Sustainability Reporting Standards (ESRS) are the mandatory disclosure standards developed by EFRAG (European Financial Reporting Advisory Group) under the Corporate Sustainability Reporting Directive (CSRD). They represent the most comprehensive mandatory sustainability reporting regime globally, applying double materiality and requiring detailed disclosure across environmental, social, and governance topics. The Commission adopted the first set in July 2023. A simplified revision, published in September 2026 as Delegated Regulation (EU) 2026/1563, cuts mandatory datapoints by more than 60% and applies from financial year 2027; companies may use it for 2026.

ESRS comprises 12 standards, a structure the 2026 revision kept:

Cross-cutting standards: ESRS 1 (General Requirements) establishes the principles, concepts, and general requirements for sustainability reporting. ESRS 2 (General Disclosures) covers governance structure, strategy, impact/risk/opportunity management, and metrics. The 2023 version requires these disclosures from all companies regardless of materiality; the 2026 revision applies the materiality filter to them too, while treating them as likely to be material for every company.

Topical standards — Environmental: ESRS E1 (Climate Change), ESRS E2 (Pollution), ESRS E3 (Water and Marine Resources), ESRS E4 (Biodiversity and Ecosystems), ESRS E5 (Resource Use and Circular Economy).

Topical standards — Social: ESRS S1 (Own Workforce), ESRS S2 (Workers in the Value Chain), ESRS S3 (Affected Communities), ESRS S4 (Consumers and End-Users).

Topical standards — Governance: ESRS G1 (Business Conduct).

Companies must disclose on all topics determined to be material through a double materiality assessment. Climate change gets special treatment: under the 2023 standards, a company that concludes climate change is not material must give a detailed explanation of that conclusion.

ESRS requires disclosure of policies, actions, targets, and metrics for each material topic, including forward-looking information about transition plans and their financial implications.

Who Uses It

• Large EU companies — after Omnibus I, those with more than 1,000 employees and more than €450 million in net turnover, which cuts the number of companies in scope by around 90% from the original CSRD's roughly 50,000
• Non-EU groups with more than €450 million in EU net turnover and an EU subsidiary or branch above €200 million — starting FY2028 (a separate standard for these groups is expected in 2027)
• Companies in the value chain of ESRS-reporting entities — increasingly requested to provide data for their customers' ESRS disclosures, though Omnibus I lets those with up to 1,000 employees limit what they provide to the voluntary SME standard (VSME)
• Auditors and assurance providers — ESRS disclosures require limited assurance; Omnibus I dropped the planned move to reasonable assurance
• Financial institutions using ESRS data for sustainable finance regulation compliance (SFDR, EU Taxonomy)

Key Requirements

1. Double materiality assessment — systematic process assessing both impact materiality and financial materiality across all ESRS topics
2. General disclosures under ESRS 2 — governance, strategy, IRO management (required regardless of materiality under the 2023 standards; subject to the materiality filter under the 2026 revision)
3. Topic-specific disclosures for all material topics — policies, actions and resources, targets, and metrics
4. Value chain coverage — disclosures must cover impacts, risks, and opportunities across the upstream and downstream value chain
5. Connectivity with financial statements — sustainability information must be connected to financial reporting
6. Digital tagging — XBRL tagging for machine readability, required once the Commission adopts tagging rules
7. External assurance — limited assurance; Omnibus I removed the planned move to reasonable assurance

How to Implement

Phase 1: Scoping and Governance (2-3 months) Determine your reporting timeline based on employee numbers and net turnover. Establish governance — board oversight, management roles, cross-functional reporting team. Engage external auditors early.

Phase 2: Double Materiality Assessment (3-5 months) Follow ESRS 1 and EFRAG implementation guidance. Identify actual and potential impacts (positive and negative) across the value chain. Assess financial materiality of sustainability-related risks and opportunities. Engage stakeholders. Document the assessment process thoroughly — your assurance provider will review it.

Phase 3: Gap Analysis and Data Infrastructure (3-6 months) Map material topics to specific ESRS disclosure requirements. Identify data gaps. Build or enhance data collection systems. Establish data quality controls suitable for external assurance.

Phase 4: Disclosure Development (3-4 months) Prepare disclosures for each material ESRS topic. Develop the management report section. Ensure connectivity with financial statements. Tag in XBRL once the Commission's tagging rules apply. Prepare for assurance engagement.

Relationship to Other Frameworks

GRI: ESRS was developed in collaboration with GRI and shares significant alignment. EFRAG and GRI published an interoperability guide. Companies with existing GRI reports have a meaningful head start.

ISSB: ESRS and ISSB share structural similarities (four-pillar architecture) but differ on materiality — ESRS uses double materiality while ISSB uses financial materiality. EFRAG and the IFRS Foundation published joint interoperability guidance in May 2024 showing high alignment on climate disclosures.

TCFD: ESRS E1 (Climate) fully incorporates TCFD recommendations within its disclosure requirements.

EU Taxonomy: Companies in CSRD scope include their EU Taxonomy disclosures (eligible and aligned activities) in the environmental section of the ESRS sustainability statement, connecting sustainability reporting to the EU's green investment framework.

Why It Matters

ESRS represents a paradigm shift in sustainability reporting — from voluntary, flexible, and investor-focused to mandatory, standardized, and stakeholder-comprehensive. The double materiality requirement means companies must account not just for how sustainability affects their finances, but for how they affect the world.

The practical implications are large. Omnibus I cut the number of companies in scope by around 90% from the original estimate of roughly 50,000, but those that remain face detailed disclosure requirements. The requirement for external assurance moves sustainability data toward the rigor of financial reporting. And the value chain coverage requirement means that ESRS-reporting companies will, in turn, request sustainability data from their suppliers and customers — extending the reporting burden beyond the companies directly in scope, though Omnibus I caps what they can ask of smaller value chain partners.

Companies that view ESRS as a compliance burden will struggle. Those that use it as a catalyst for genuine sustainability integration — improving data infrastructure, strengthening governance, and connecting sustainability to business strategy — will find that the reporting process itself drives operational improvement.