Independent reference · Updated 9 August 2026
UK Sustainability Reporting Standards — UK SRS, mapped
Six bodies publish sustainability reporting standards that a UK organisation might be asked to use: the Global Reporting Initiative, SASB, the ISSB's IFRS S1 and S2, the EU's ESRS, the residue of TCFD, and the UK's own UK SRS S1 and S2.
Almost none of it is law where you are sitting. This page is the map — what each one is, who it binds, when it starts, and which ones you can safely ignore.
Find which standards apply to you Four questions · listing status, size, EU exposure · nothing leaves your browserThe UK reporting stack
Which regime applies to you?
Four regimes now sit alongside each other — two UK SRS standards, one established regulation, one energy scheme. Knowing which apply is the first step in any gap analysis, and the one most guides skip.
Orientation
UK SRS in ninety seconds.
Four questions every sustainability lead should be able to answer before the meeting starts — who must comply, what to report, when it kicks in, and how it differs from the ISSB baseline.
Descending into the four pillars, the timeline, and the numbers
Disclosure framework
The four pillars, read closely.
UK SRS inherits the TCFD architecture and extends it across all material sustainability topics. Governance sets who’s accountable; strategy sets what’s material; risk management sets how it’s tracked; metrics and targets set what gets published. Every UK SRS page on this site is organised around one of these four.
Key milestones
Four years, five dates, one decision.
Publication on 25 February 2026. An FCA Policy Statement expected in autumn 2026. Proposed mandatory climate reporting from 1 January 2027, Scope 3 comply-or-explain from 2028, S1 comply-or-explain from 2029. Between now and all of that sits one document.
Materiality assessment
Scope 3 dwarfs Scope 1 and 2 — and readiness lags behind.
Across a typical UK plc emissions profile, value-chain emissions are the overwhelming majority — and the hardest to measure. FTSE 350 readiness by pillar shows governance leading, with metrics, Scope 3 and assurance the principal gaps.
Where investors and the FCA disagree
Do the Scope 3 and S1 carve-outs go too far?
Our signature format: the live tension in the regime, argued honestly in both directions — facts carry citations, judgment is labelled as judgment. This is the central disagreement between investor bodies and the FCA’s proportionality approach.
Investor concern
FCA rationale
Are you in scope?
Three questions to assess whether your organisation must comply with UK SRS — and on what timeline.
Note — This is an indicative check based on the FCA / CA 2006 thresholds. For a definitive view, consult our full gap analysis guide.
What are the UK Sustainability Reporting Standards (UK SRS)?
The UK Sustainability Reporting Standards (UK SRS) are the UK-endorsed version of the ISSB’s global IFRS Sustainability Disclosure Standards. Published by the Department for Business and Trade on 25 February 2026, UK SRS comprises UK SRS S1 (general sustainability disclosures) and UK SRS S2 (climate-related disclosures), providing UK companies with one comparable baseline for reporting sustainability and climate risks that affect enterprise value. For UK SRS implementation support, consider working with a specialist carbon compliance consultancy, a fractional sustainability expert for ongoing advisory support, or GTM consultants to align go-to-market strategy with ESG reporting requirements.
New to UK SRS? Start with what is UK SRS, explore the UK SRS S1 and UK SRS S2 standards, review full UK SRS requirements, check who must comply with UK SRS, understand ESG reporting requirements UK, and see whether CSRD applies to your UK group.
ESOS Phase 4: part of ESG reporting requirements UK
Determine if your organisation must comply with ESOS Phase 4 energy audit requirements. Qualification is assessed on 31 December 2026 based on size thresholds.
UK SRS vs other ESG reporting requirements UK
| Framework | Best for | Focus areas | Assurance |
|---|---|---|---|
| UK SRS | UK listed companies | Climate + enterprise value | ISSA (UK) 5000 |
| GRI | Impact-focused reporting | Double materiality | ISAE 3000 |
| ISSB | International reporting | Investor needs | ISSA 5000 |
| TCFD | Climate-focused reporting | Climate risks | Limited assurance |
What is sustainability reporting?
Sustainability reporting is the disclosure of an organisation’s environmental, social and governance performance alongside its financial accounts. Where financial reporting describes how a company has performed economically, sustainability reporting describes its exposure to climate, social and governance risks — and the impact those risks have on its prospects.
The ISSB’s IFRS S1 and S2 — issued by the IFRS Foundation in June 2023 — focus on financial materiality: information investors need to price a company. The EU’s ESRS, in contrast, uses double materiality: investor-relevant information and the company’s impact on people and planet. UK SRS is the UK’s adoption of the ISSB baseline.
| Framework | Issuer | Materiality | UK relevance |
|---|---|---|---|
| ISSB — IFRS S1 & S2 | IFRS Foundation | Financial (single) | UK SRS S1 and S2 (UK adoption, six amendments) |
| ESRS (CSRD) | European Commission (EFRAG) | Double materiality | EU large companies; UK groups via EU subsidiaries |
| GRI Standards | Global Reporting Initiative | Impact (double) | Voluntary worldwide; stakeholder reporting |
| TCFD (legacy) | Financial Stability Board | Climate only | Disbanded Oct 2023; continues through IFRS S2 |
| SASB | IFRS Foundation | Industry-specific | Supports IFRS S2 / UK SRS S2 sector disclosures |
The six standard-setters, and what each one actually is
Each body publishes a complete set and explains its own. None of them publishes the map, so here it is.
Three of the six use a different definition of materiality from the other three, which is the single most confused thing in the subject — it is set out below.
Who must report, and under which sustainability reporting standards
The honest answer for most UK organisations in August 2026: none of the six standards binds you, and two older rules that are not standards at all probably do.
Sustainability disclosure, sustainability reporting, and sustainability regulations
Three phrases that are used interchangeably and should not be. The distinction decides which document you are looking for.
Reporting frameworks, reporting standards and reporting guidelines
A framework tells you how to think. A standard tells you what to disclose. Guidelines tell you how to do it. Only one of the three can be complied with.
| Term | What it does | Can you comply with it? | Example |
|---|---|---|---|
| Framework | Sets a structure for thinking about a subject | No — there is nothing to test | TCFD's four pillars |
| Standard | Specifies the disclosures required, testably | Yes | IFRS S2, UK SRS S2, ESRS E1 |
| Guidelines / guidance | Explains how to apply a standard or a law | No — but ignoring them is visible | DBT's Environmental Reporting Guidelines |
TCFD is the clearest case. It was always a framework, never a standard — which is why "TCFD compliance" was never a coherent claim, and why its absorption into IFRS S2 in 2023 turned four pillars of guidance into testable disclosure requirements for the first time.
Three definitions of materiality, and why the same company gets three different reports
This is the difference that makes the six standards genuinely incompatible, rather than merely differently worded.
The consequence is practical. A company that has done a GRI materiality assessment has not done an ISSB one, and cannot reuse the conclusion. The UK SRS S1 materiality assessment is its own exercise, and the GRI and IFRS Foundation have published joint guidance precisely because organisations kept assuming otherwise.
Where the global sustainability reporting standards are actually law
Roughly 40 jurisdictions are adopting or using the ISSB standards. In four of them the obligation has already started, which makes them the closest thing to a preview of the UK's own timetable.
Australia and Singapore matter to a UK reader for one reason: a UK group with subsidiaries in either is already inside a mandatory ISSB-aligned regime, whatever the FCA does next.
Sources — FCA CP26/5 ¶1.3; ASX; Japan FSA roadmap; SGX; CSSB; IFRS Foundation — use by jurisdiction.
Software or consultancy?
Select the best carbon reporting software for UK SRS and ESG reporting requirements UK, or bring in expert help. Many companies use both.
💻 Choose software if…
- Building in-house reporting capability
- Need repeatable, consistent process
- Want ongoing control and cost efficiency
- Have internal sustainability expertise
- Multiple reporting frameworks to manage
- Regular reporting cycles (annual/quarterly)
👥 Choose consultancy if…
- First-time carbon inventory
- Limited internal sustainability resources
- Need immediate expert guidance
- Complex value chain assessment required
- One-off reporting requirement
- Assurance readiness support needed
Key dates: FCA Policy Statement expected autumn 2026. ISSA (UK) 5000 assurance standard effective 15 December 2026. First UK SRS reports due within 4 months of year-end.
Data quality is paramount: UK SRS requires quantitative metrics with assurance-ready documentation. Build robust data collection, validation, and control processes from day one.
Board oversight required: UK SRS governance disclosures require documented board oversight. Establish sustainability committees before mandatory reporting begins.
Scenario analysis complexity: Most companies engage consultants for initial UK SRS scenarios then build internal capability over time.
Recommended implementation approach
Based on analysis of successful UK SRS implementations, a phased approach starting with gap analysis, followed by data infrastructure development, pilot reporting, and assurance readiness.
- Start with comprehensive gap analysis against UK SRS requirements
- Build Scope 3 data collection infrastructure early (long lead time)
- Establish board-level governance before mandatory reporting begins
- Engage assurance providers early for ISSA (UK) 5000 readiness
- Run pilot reporting cycles to identify and address issues
Keep reading
This guide is the entry point. Continue into the specialist topic pages below — the full second-stage reference for every UK SRS question.
Core Standards
UK SRS topic hubWhat is UK SRS? UK SRS S1 full guideUK SRS S2 full guide Timeline & deadlinesFour pillars frameworkImplementation
Compliance guideReadiness calculator Who must complyCarbon management software Assurance requirementsGap analysisSpecialist Topics
Scope 3 emissionsScenario analysis Nature-related disclosuresTransition plans Materiality under S1UK Sustainability Reporting Standards: FAQ
The essential answers on UK SRS S1 and S2 — what they are, who must comply, and when reporting becomes mandatory — followed by deeper questions from practitioners, investors and compliance teams.
The UK Sustainability Reporting Standards (UK SRS) are the UK-endorsed version of the ISSB's global IFRS Sustainability Disclosure Standards. They were published by the Department for Business and Trade (DBT) on 25 February 2026 and comprise two standards: UK SRS S1 (general sustainability-related financial disclosures) and UK SRS S2 (climate-related disclosures). Together they give UK companies a single, comparable baseline for disclosing the sustainability and climate risks and opportunities that affect enterprise value.
UK SRS S1 sets the general requirements for disclosing material sustainability-related financial information — the risks and opportunities that could reasonably affect a company's cash flows, access to finance or cost of capital over the short, medium and long term. It mirrors IFRS S1 and applies across all sustainability topics, not only climate.
UK SRS S2 is the climate-specific standard. It requires disclosure of climate-related risks and opportunities, greenhouse-gas emissions across Scopes 1, 2 and 3, scenario analysis and transition-plan information, following the four-pillar TCFD architecture of governance, strategy, risk management, and metrics and targets. It mirrors IFRS S2.
Not yet. The finalised UK SRS S1 and S2 are currently available for voluntary use by any entity. The Financial Conduct Authority (FCA) consulted in CP26/5 on making climate and sustainability disclosures mandatory for UK-listed companies; the consultation closed on 20 March 2026 and a final policy statement is expected in autumn 2026. The Government is separately considering extending mandatory reporting to large companies through the Companies Act.
Under the FCA's CP26/5 proposals, mandatory reporting would apply to in-scope UK-listed companies (UK Listing Rules categories 6, 14, 15, 16 and 22) for accounting periods beginning on or after 1 January 2027, with the first reports published in 2028. Scope 3 emissions and certain UK SRS S1 reliefs phase in after the first reporting year.
During the voluntary phase, any UK entity may apply UK SRS. Once the FCA finalises its rules, in-scope UK-listed companies would report mandatorily from 1 January 2027. Large private companies are expected to follow later via the Companies Act and the Government's Modernising Corporate Reporting programme. Many large companies are already subject to related regimes such as SECR and TCFD-aligned disclosures.
UK SRS are based directly on IFRS S1 and S2 but make six minor UK-specific amendments — including adjustments to the effective dates and to certain transition reliefs — so the standards fit UK law and the listing rules. The technical content otherwise stays aligned with the global ISSB baseline to preserve international comparability.
UK SRS sits within the broader UK SDR framework, which includes FCA SDR investment product labels, transition plan requirements under separate consultation, and ISSA (UK) 5000 assurance standard. The approach supports the Leeds Reforms package aimed at strengthening the UK's position as a global financial centre.
37 jurisdictions have decided to use or are taking steps to introduce ISSB Standards as of September 2025, per the IFRS Foundation tracker — covering approximately 60% of global market capitalisation, 60% of global GDP, and over 40% of global greenhouse gas emissions.
The PRI (representing $128tn AUM) has expressed concerns that these provisions risk limiting investors' access to material information and depart from most of the nearly 40 jurisdictions adopting ISSB standards. PRI recommends a phased mandatory approach rather than comply-or-explain.
The FCA will set out its enforcement approach in a future Primary Market Bulletin — the standard mechanism for communicating supervisory expectations to listed companies. This will detail monitoring approaches, common challenges, and enforcement priorities.
Voluntary adopters can use the standards-level reliefs (UK SRS S1 paragraphs E3, E4, E6 and Scope 3 deferral in S2) but must adjust their compliance statements accordingly. The FCA's timing-specific reliefs in CP26/5 apply only to in-scope listed companies from 1 January 2027.
Listed asset managers should prepare for the mandatory reporting the FCA has proposed from 2027 in CP26/5 — a proposal, not yet a rule, with the Policy Statement still pending. All managers benefit from improved standardised data from portfolio holdings. Private capital managers may face MCR Strand 2 implications for portfolio company scoping and data flows.
The UK follows the ISSB-aligned majority with six minor amendments to UK SRS S1 and S2. Australia has phased mandatory implementation by entity size. Japan permits SSBJ standards with FSA decision pending. The EU's CSRD/ESRS uses double materiality, broader than the ISSB baseline.
The TPT framework has been integrated under the IFRS Foundation since 2024. FCA CP26/5 proposes referencing IFRS Educational Material (incorporating TPT elements) as guidance for companies. The FCA does not mandate transition plans but requires disclosure of whether and where published.
Primary sources cited on this page
Why this guide exists
Independent. Sourced.
Actionable.
Every figure on this page carries an inline citation to its primary source. No number appears here without one. That’s the whole editorial policy — and now, the compliance check is built into the reading.