Canonical Reference
UK sustainability reporting: the complete guide
UK sustainability reporting changed permanently in 2026. This guide maps the whole landscape with UK SRS at its centre — the standards, the FCA rules, existing regimes, emerging frontiers, and how every framework connects.
What UK SRS is
UK SRS comprises two standards. UK SRS S1 sets the general requirements for disclosing sustainability-related financial information across governance, strategy, risk management, and metrics and targets, and applies to any sustainability matter that could reasonably affect a company's cash flows, access to finance, or cost of capital 3. UK SRS S2 applies that framework specifically to climate, requiring disclosure of greenhouse gas emissions across Scopes 1, 2 and 3, plus climate scenario analysis and resilience information 4. A defining feature is connectivity: sustainability disclosures must connect explicitly to the financial statements and be published at the same time, for the same period 28. The standards apply enterprise-value (financial) materiality — the outside-in effect on the company — not the "double materiality" used by the EU 9.
The regulator: how UK SRS becomes mandatory
DBT publishes the standards, but it does not compel anyone to use them — they are voluntary 1. Whether listed companies *must* report against them is the FCA's decision, set out in Consultation Paper CP26/5, published on 30 January 2026 5. CP26/5 proposes mandatory UK SRS S2 climate reporting for in-scope listed companies for accounting periods beginning on or after 1 January 2027, replacing the FCA's existing TCFD-aligned listing rules 22. Scope 3 emissions and the wider UK SRS S1 disclosures would instead be "comply or explain" 6. The consultation closed on 20 March 2026, with a Policy Statement expected in autumn 2026 5. Roughly 500 listed issuers fall within scope, across five UK Listing Rule categories 725.
Scope 3 and the GHG Protocol
Emissions sit at the heart of UK SRS S2, which requires measurement using the GHG Protocol Corporate Standard and reporting in tonnes of CO₂ equivalent across all three scopes 416. UK companies convert activity data using the UK Government's GHG Conversion Factors, published by the Department for Energy Security and Net Zero (DESNZ) 16. Scope 3 — value-chain emissions — is the hardest part, which is why the FCA proposes to treat it as comply-or-explain rather than strictly mandatory 6.
The legacy and adjacent regimes
UK SRS does not arrive into a vacuum. Streamlined Energy and Carbon Reporting (SECR), introduced in 2019, already requires large companies and LLPs to disclose energy use and Scope 1 and 2 emissions in their annual reports; "large" means meeting two of three thresholds — turnover of £36m or more, balance sheet of £18m or more, or 250 or more employees — capturing roughly 11,900 entities 10. SECR is enforced by the FRC's Conduct Committee and remains in place; its thresholds were left unchanged even as wider company-size limits rose for periods beginning on or after 6 April 2025 1011. The Government has said it will consider how SECR and UK SRS interact to reduce duplication 23. The Task Force on Climate-related Financial Disclosures (TCFD) — the framework underpinning the FCA's current listing rules — was formally disbanded in 2023 and absorbed into the ISSB, and UK SRS S2 is its successor 1222.
The emerging frontiers: nature and transition plans
Two areas are moving fast. Nature is next: the ISSB announced in November 2025 that it will develop nature-related disclosure standards drawing on the TNFD framework, with an exposure draft targeted for October 2026 14 — though any resulting standard would need UK endorsement before entering UK SRS 15. Transition plans are the other live question: UK SRS S2 already requires a company to disclose its transition plan where one exists 20, while DESNZ has consulted on whether to make transition plans mandatory and has so far kept its options open 18. Both are covered in depth in the dedicated guides linked below.
The international and concept context
UK SRS is deliberately aligned with the global ISSB baseline so UK disclosures stay internationally comparable 2. It diverges sharply from the EU's Corporate Sustainability Reporting Directive (CSRD), which applies double materiality — reporting both a company's impact on the world and the world's financial impact on the company — whereas UK SRS uses financial materiality only 926. Notably, the UK chose disclosure standards over a classification system: in July 2025 HM Treasury decided **not** to proceed with a UK Green Taxonomy, prioritising reporting standards, ESG-ratings regulation and transition plans instead 17.
Related guides & references
UK SRS S1: General Sustainability Disclosures
Complete guide to UK SRS S1 requirements for general sustainability-related financial information.
UK SRS S2: Climate-Related Disclosures
Comprehensive coverage of UK SRS S2 climate reporting requirements and implementation.
FCA Authority & CP26/5
FCA regulatory framework for mandatory UK SRS implementation and enforcement.
Scope 3 Emissions Reporting
Detailed guide to all 15 GHG Protocol categories under UK SRS S2.
TNFD and Nature Reporting
Nature reporting framework and its path into UK SRS through ISSB standards.
SECR Explained
Streamlined Energy and Carbon Reporting requirements and UK SRS interaction.