CSRD vs IFRS S1 and S2 comparison for reporting teams

CSRD is EU legislation. ESRS were adopted through Commission Delegated Regulation (EU) 2023/2772 and apply through the Accounting Directive as amended by CSRD.

IFRS S1 and S2 are IFRS Sustainability Disclosure Standards developed by the ISSB. They are applied when a jurisdiction adopts or otherwise uses ISSB Standards, or when a company chooses to apply them.

Do not treat ISSB alignment as a substitute for CSRD scoping. First confirm whether the company is in CSRD scope, then map which IFRS S1/S2 disclosures can be reused.

ESRS sustainability statements are prepared for users named in ESRS, including investors and other users such as business partners, trade unions, civil society, governments, analysts, and academics.

IFRS S1 and S2 focus on investor-company dialogue by providing decision-useful, globally comparable sustainability-related disclosures for investors.

Start from the CSRD reporting entity and ESRS sustainability statement, then identify which ISSB disclosures serve the investor-focused audience without dropping ESRS users or topics.

ESRS uses double materiality. A sustainability matter is material when it meets impact materiality, financial materiality, or both; ESRS 2 general disclosures remain required irrespective of topic materiality.

IFRS S1 and S2 use an investor-focused materiality lens for decision-useful sustainability-related financial disclosures.

An ISSB materiality assessment cannot replace ESRS double materiality. Reuse risk and opportunity analysis, but keep ESRS impact materiality evidence and topic-omission reasoning.

ESRS has cross-cutting standards, topical standards, and future sector-specific standards. ESRS 2 structures disclosures around governance, strategy, impact/risk/opportunity management, and metrics and targets.

IFRS S1 sets general sustainability-related financial disclosure requirements; IFRS S2 adds climate-related disclosure requirements. The interoperability guidance says the standards are aligned at a high level, especially for climate.

Build a disclosure crosswalk by requirement, not by theme alone: ESRS 2 and topical ESRS datapoints may be more granular than an IFRS S1/S2 management narrative.

A CSRD evidence file should retain the CSRD scope conclusion, ESRS materiality assessment, IRO register, ESRS 2 disclosures, topical disclosure decisions, value-chain methods, assurance evidence, and tagging crosswalk.

An IFRS S1/S2 evidence file should retain investor-material sustainability risks and opportunities, governance and strategy disclosures, climate assumptions, metrics and targets, and any interoperability mapping to ESRS.

Use shared data owners for emissions, finance, risk, HR, procurement, and legal evidence, but require each data point to show the disclosure requirement it supports.

ESRS value chain reporting covers activities, resources, and relationships in own operations plus upstream and downstream value chain, including indirect business relationships where relevant to material impacts, risks, and opportunities.

IFRS S1 and S2 also address value-chain information, and EFRAG's value-chain guidance notes alignment with ISSB definitions, but ESRS still controls the CSRD sustainability statement.

Use one supplier and value-chain data model where possible, but tag each field to the ESRS disclosure or ISSB disclosure it supports.

CSRD adds sustainability reporting assurance into EU audit and company-reporting law. The audit committee may monitor sustainability reporting, electronic reporting, and assurance processes.

IFRS S1 and S2 do not themselves create an EU assurance mandate. Assurance depends on the jurisdiction, regulator, listing rule, or voluntary assurance engagement.

For CSRD reporters, design evidence for assurance from the start. IFRS S1/S2 evidence can support assurance, but it does not remove CSRD assurance responsibilities.

ESRS preparers can use the ESRS-ISSB interoperability guidance to identify where ESRS disclosures can also satisfy ISSB information needs, especially for climate.

ISSB reporters can use the same guidance to understand where additional ESRS requirements remain when CSRD applies, including double materiality and wider ESRS users.

Treat interoperability as a crosswalk, not a merger. Reuse source data and controls where the guidance supports it, while keeping separate sign-off for ESRS legal compliance.

Use CSRD and ESRS as the controlling baseline when the company must publish an EU sustainability statement under CSRD.

Use IFRS S1 and S2 as the controlling baseline when the reporting obligation or voluntary program is ISSB-based and CSRD does not control the filing.

If both apply, start with the ESRS sustainability statement, add an ESRS-ISSB crosswalk, and document the few areas where ISSB-aligned reporting needs extra or different wording.