01
Section · IFRS / ISSB
IFRS S1 & S2
The ISSB sustainability disclosure standards — IFRS S1 (general requirements) and IFRS S2 (climate). The global baseline the UK adopts as UK SRS.
06 · Framework lineage
TCFD → ISSB → UK SRS
TCFD
Four disclosure pillars. Disbanded 2023 — work absorbed into the ISSB.
IFRS S1 & S2
Global baseline. S2 fully incorporates the TCFD’s four-pillar structure.
+6 UK
UK SRS S1 & S2
The ISSB standards with six UK-specific amendments. Voluntary now; S2 proposed mandatory 2027.
ESRS (CSRD)
Parallel standard — interoperable with ISSB on climate (ESRS E1 ↔ IFRS S2).
TCFD
Four pillars. Disbanded 2023 — absorbed into the ISSB.
IFRS S1 & S2
Global baseline; S2 carries the TCFD structure.
ESRS (CSRD)
Parallel standard — interoperable on climate.
+6 UK AMENDMENTS
UK SRS S1 & S2
Voluntary now; S2 proposed mandatory 2027.
Start here
All guides →Overview
IFRS S1 & S2
Overview · 12 min
IFRS S1 and S2 explained
Both standards, global adoption status, and UK implementation via UK SRS.
General
IFRS S1
Standard · 8 min
IFRS S1 — general requirements
Enterprise-value materiality, the four pillars, and connectivity with the accounts.
Climate
IFRS S2
Standard · 8 min
IFRS S2 — climate disclosures
Mandatory scenario analysis and Scope 1, 2 and 3 emissions.
Standard-setter
The ISSB
Guide · 6 min
What is the ISSB?
The board behind IFRS S1/S2 and the global baseline.
Most read
This month →Key updates
All updates →- 26 Jun 2023
- 1 Jan 2024
- 25 Feb 2026
- 2026
IFRS S1/S2 timeline
Full timeline →Tool
Are you ready for IFRS / UK SRS?
Check which IFRS-based UK SRS obligations apply to your entity and by when.
Run the compliance checkRelated sections
All sections →Standards
UK SRS
The UK adoption of IFRS S1/S2 — the route by which these standards become UK obligations.
European
ESRS / CSRD
The EU standards with double materiality — relevant to UK groups with EU operations.
Climate disclosure
TCFD
The four-pillar framework IFRS S2 builds on and supersedes.
ESG
ESG
The broader ESG reporting picture IFRS standards sit within.
About IFRS S1 & S2
IFRS S1 and S2 were issued by the International Sustainability Standards Board (ISSB) on 26 June 2023, effective for periods beginning on or after 1 January 2024.
The UK has adopted them as UK SRS S1 and S2.
Authority sources
02
IFRS Foundation
03
04
Financial Conduct Authority