IFRS S2 does not exist in isolation. It was designed to work alongside, not against, existing regional frameworks and voluntary standards. Understanding these interoperability relationships helps entities reduce duplication, leverage existing work, and comply with multiple requirements efficiently.
IFRS S2 as a Global Baseline
The ISSB's foundational design principle is that IFRS S2 is a comprehensive global baseline. The Basis for Conclusions (BC16) explains this clearly: the baseline is a floor, not a ceiling. Jurisdictions may add supplementary requirements above the baseline, but any entity meeting those higher requirements automatically meets IFRS S2.
This architecture serves several purposes:
- For global companies: One set of core disclosures (IFRS S2) can be supplemented efficiently for different jurisdictional requirements
- For investors: IFRS S2 compliance carries consistent meaning worldwide, regardless of jurisdictional supplements
- For jurisdictions: They can adopt IFRS S2 as their climate disclosure standard and add whatever supplements reflect local priorities
Relationship to TCFD
The TCFD framework is the direct ancestor of IFRS S2. Entities already applying TCFD recommendations are well-positioned for IFRS S2 compliance. The four pillars are identical, and the concepts are closely aligned.
Key differences that TCFD reporters need to address for IFRS S2:
- More specific disclosure requirements (for example, the five governance body disclosures in Para 6(a))
- Mandatory GHG Protocol basis (TCFD allows any methodology)
- Specific Scope 3 measurement framework
- Quantitative financial effects disclosure (Para 15 to 21), which is more demanding than typical TCFD practice
- Financed emissions disclosure for financial institutions
Relationship to European Sustainability Reporting Standards (ESRS)
The EU's ESRS 1 and ESRS E1 (Climate Change) were designed with explicit interoperability objectives relative to IFRS S2. Entities subject to both ESRS and IFRS S2 (primarily EU-listed multinationals) can generally meet both requirements with integrated disclosures:
| Area | IFRS S2 | ESRS E1 | Key Differences |
|---|---|---|---|
| GHG emissions | Scope 1, 2, 3 in tCO2e | Scope 1, 2, 3 in tCO2e | ESRS requires location- and market-based Scope 2; IFRS S2 requires location-based with market-based info |
| Scenario analysis | Commensurate approach required | Required; ESRS is more prescriptive on scenario selection | ESRS may require specific temperature scenarios |
| Transition plans | Disclosed if entity has one | More specific requirements on transition plan content | ESRS goes further on transition plan disclosures |
| Physical risk | Required | Required with more detail on specific hazards | ESRS E1 requires hazard-by-hazard assessment |
| Industry metrics | Refer to and consider industry guidance | Sector-specific requirements under development | ESRS sector standards in development may add requirements |
Relationship to GRI Standards
The Global Reporting Initiative (GRI) Standards are the most widely used global sustainability reporting framework. GRI 305 (Emissions) is closely aligned with IFRS S2's GHG emissions requirements, both using the GHG Protocol as the basis.
Key connection: entities already reporting GRI 305 metrics will have most of the GHG emissions data required by IFRS S2. However:
- GRI 305 does not require the specific financial effects disclosures of IFRS S2 (Para 15 to 21)
- GRI 305 does not require the structured Scope 3 measurement framework (B38 to B57)
- GRI's audience is broader (all stakeholders); IFRS S2 is focused on financial statement users
Relationship to the GHG Protocol
The GHG Protocol Corporate Standard (2004) is the mandatory measurement basis for IFRS S2 GHG disclosures. Any entity already using the GHG Protocol for carbon accounting will have the right measurement foundation in place.
The 2025 amendments maintained the GHG Protocol as the mandatory basis while providing targeted jurisdictional reliefs, reflecting the Protocol's status as the global standard for corporate GHG accounting.
Other Regulatory Frameworks
| Framework | Jurisdiction | Interoperability |
|---|---|---|
| SEC Climate Rules | United States | Both require Scope 1 and 2 disclosure; SEC originally proposed Scope 3 but subsequently scaled back |
| TNFD (Nature) | Global voluntary | IFRS S2 is climate-only; TNFD covers biodiversity. Complementary, not overlapping. |
| ISSB IFRS S1 | Global | IFRS S2 must be applied with IFRS S1; S1 provides the general framework |
| SBTi (Science Based Targets initiative) | Global voluntary | SBTi validates targets against climate science; IFRS S2 requires disclosure of whether targets are validated |
| CDP questionnaire | Global voluntary | CDP disclosure is largely consistent with IFRS S2 content; CDP is moving to IFRS S2 alignment |
Key Takeaways
- 1IFRS S2 is a global baseline floor - any entity meeting higher jurisdictional requirements (e.g. ESRS) automatically meets IFRS S2
- 2TCFD reporters are well-positioned but must address gaps in specific governance disclosures, mandatory GHG Protocol basis, Scope 3 measurement framework, and quantitative financial effects
- 3Entities subject to both IFRS S2 and ESRS E1 can produce integrated disclosures, though ESRS goes further on transition plans, scenario selection, and hazard-by-hazard physical risk assessment
- 4GRI 305 reporters already have GHG accounting foundations in place but need to add financial effects disclosures (Para 15-21) and structured risk management processes
- 5CDP is moving toward IFRS S2 alignment, meaning CDP disclosures will increasingly satisfy IFRS S2 content requirements