IFRS S2 vs CSRD: what's the same, what's different

If you operate internationally, you may face two climate disclosure regimes at once: the ISSB's IFRS S2 and the EU's CSRD, delivered through the ESRS standards. They overlap heavily — and then diverge on a few points that change how you have to work. Here's the honest comparison.

The short version

	IFRS S2	CSRD / ESRS
Issuer	ISSB (IFRS Foundation)	EU, via EFRAG (ESRS)
Scope	Climate-related (S2); S1 covers general sustainability	Full ESG — climate (E1) plus environment, social, governance
Materiality	Single (financial) materiality	Double materiality (financial + impact)
Who must comply	Set jurisdiction-by-jurisdiction as adopted	Large EU companies + many non-EU companies with EU operations
Assurance	Phased per jurisdiction (limited → reasonable)	Limited from the start, moving toward reasonable
GHG basis	GHG Protocol, Scopes 1, 2, 3	GHG Protocol, Scopes 1, 2, 3

What's the same

More than people expect. Both regimes are built on the same conceptual spine, and a well-prepared climate disclosure satisfies a large share of both.

• The four-pillar structure. Governance, strategy, risk management, and metrics & targets — the TCFD architecture — sits underneath both IFRS S2 and ESRS E1.
• GHG accounting. Both require gross Scope 1, 2 (location- and market-based) and material Scope 3 emissions, measured under the GHG Protocol.
• Scenario analysis. Both expect a climate-resilience assessment using scenario analysis, including a higher-warming pathway.
• Transition plans, targets, and financial effects. Both ask how climate affects strategy and the numbers, and what targets you've set.

EFRAG and the ISSB have published interoperability guidance precisely because the climate content lines up so closely. If you've built a solid IFRS S2 climate disclosure, you've done most of the ESRS E1 work too.

What's different — and why it matters

1. Single vs double materiality

This is the headline difference. IFRS S2 uses single (financial) materiality: disclose what could reasonably affect your enterprise value. CSRD requires double materiality: that, plus your impact on the climate and society, even where it doesn't hit your own balance sheet. Double materiality means a broader assessment and, usually, more to disclose.

2. Climate-only vs full ESG

IFRS S2 is climate-specific (with IFRS S1 covering general sustainability). CSRD is comprehensive — ESRS spans climate, pollution, water, biodiversity, circular economy, workforce, communities, and business conduct. A first-cycle IFRS S2 reporter is doing a focused job; a CSRD reporter is doing a much wider one.

3. Who's caught

IFRS S2 only bites where a jurisdiction has adopted it (see our deadlines by jurisdiction). CSRD applies to large EU companies and, critically, to many non-EU companies with significant EU turnover and a branch or subsidiary in the bloc — so it can reach you even if your home regime hasn't mandated IFRS S2. (Note: the EU's 2025 "Omnibus" proposals may narrow scope and shift timing — confirm the current position.)

Which applies to you?

In practice:

• Listed in an ISSB-adopting jurisdiction (Malaysia, Singapore, Australia, Hong Kong, Japan, and others) → IFRS S2 or its local equivalent.
• Large EU company, or a non-EU group with material EU operations → CSRD/ESRS.
• Both → build the climate disclosure once to IFRS S2's rigor, then extend the materiality assessment and the broader topics for CSRD.

Whichever regime you report under, the auditor's question is identical: can you show where every number came from, who approved it, and that it hasn't changed? The framework sets the content. The audit trail is what survives assurance.

That's the part neither standard hands you — and the part a spreadsheet can't. Auditably builds the IFRS S2 disclosure spine with the lineage, controls, and immutable trail an assurer tests, regardless of which regime you file under.