ESRS (European Sustainability Reporting Standards)

What is ESRS?

ESRS 1 establishes the architecture. Every in-scope undertaking begins with a double materiality assessment (ESRS 1 paragraphs 37–58), evaluating each sustainability matter from two perspectives: impact materiality (the undertaking's actual or potential effects on people and the environment) and financial materiality (sustainability-related risks and opportunities that could affect the undertaking's cash flows, performance, or cost of capital). A matter is material if it meets either threshold. ESRS 1.38 makes clear that the assessment determines which topical standards the undertaking must report against.

ESRS 2 then applies unconditionally. It requires every reporting entity to disclose governance arrangements (GOV), strategy and business model interactions (SBM), the process for identifying impacts, risks, and opportunities (the IRO assessment), and metrics and targets. The ten topical standards (ESRS E1 through E5 for environmental matters, ESRS S1 through S4 for social matters, ESRS G1 for business conduct) add subject-specific disclosure requirements and datapoints that activate only when the corresponding topic passes the materiality gate.

For auditors, the assurance dimension is immediate. The CSRD requires at least limited assurance on the sustainability statement from the first reporting year. ISSA 5000, finalised in November 2024, becomes effective for periods beginning on or after 15 December 2026 and provides the global framework for these engagements.

Worked example: Schäfer Elektrotechnik AG

Client: German electronics manufacturer, FY 2024, revenue €310M, IFRS reporter. Schäfer is a Wave 1 entity (listed, over 500 employees) and must prepare its first ESRS-compliant sustainability statement for FY 2024, published in 2025.

Step 1 — Conduct the double materiality assessment

Schäfer's sustainability team identifies 42 sub-topics from the ESRS topical list (ESRS 1, Application Requirement 16). For each sub-topic, the team scores impact severity (scale, scope, irremediable character) and financial likelihood and magnitude. Climate change (E1), own workforce (S1), pollution (E2), and business conduct (G1) pass both thresholds. Biodiversity (E4) passes the impact threshold only. Water (E3), affected communities (S3), and consumers (S4) do not meet either threshold and are excluded.

Step 2 — Map disclosure requirements to material topics

For each material topical standard, Schäfer identifies the applicable disclosure requirements and individual datapoints. ESRS E1 alone contains disclosure requirements covering greenhouse gas emissions (Scope 1, 2, and 3), energy consumption, and the climate transition plan. The team counts 247 applicable datapoints across the five material topical standards plus ESRS 2.

Step 3 — Prepare the sustainability statement

Schäfer drafts disclosures within the management report. Scope 1 emissions total 14,200 tonnes CO2e. Scope 2 emissions (location-based) are 28,600 tonnes CO2e. The transition plan targets a 42% reduction by 2030, backed by €18M in committed capital expenditure for energy-efficiency retrofits. Workforce disclosures under ESRS S1 cover 2,840 employees across four EU sites, including gender pay gap data (7.3%) and health and safety incident rates.

Step 4 — Obtain limited assurance

Schäfer's statutory auditor performs a limited assurance engagement on the sustainability statement. The engagement covers the double materiality assessment, the completeness of the datapoint population, and the accuracy of reported metrics. The auditor identifies that Scope 3 emissions (category 1, purchased goods) rely on spend-based estimates with a ±25% uncertainty band and includes an emphasis paragraph in the assurance report.

Conclusion: Schäfer's sustainability statement covering five material topical standards and 247 datapoints is defensible because the double materiality assessment follows ESRS 1's prescribed methodology, each datapoint traces to a documented source, and limited assurance has been obtained over the full statement.

Why it matters in practice

Firms treat the double materiality assessment as a one-off exercise performed at implementation. ESRS 1.49 requires the undertaking to update its materiality assessment at each reporting date. A topic that was immaterial in the prior year (water use, for instance) may become material after an acquisition or a regulatory change. Auditors who roll forward the prior-year materiality conclusion without re-evaluating current conditions leave a gap that inspection teams can trace directly to ESRS 1.

The first cycle of Wave 1 reports (FY 2024) revealed widespread confusion between disclosure requirements and datapoints. Undertakings omitted mandatory ESRS 2 disclosures (particularly IRO-1, the description of the process for identifying impacts, risks, and opportunities) on the assumption that topical materiality results exempted them. ESRS 2 applies unconditionally regardless of which topical standards are material (ESRS 1.14). Assurance providers who scope their procedures around topical standards alone miss these cross-cutting omissions.

ESRS vs. ISSB sustainability disclosure standards

The distinction matters because multinational groups reporting under both frameworks must reconcile different materiality conclusions. A climate risk that is financially material under IFRS S2 may also trigger impact materiality disclosures under ESRS E1 that go beyond what the ISSB requires. Auditors of dual reporters need to verify that management has not assumed equivalence where the two frameworks diverge on scope.

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