UK Sustainability Reporting Standards (UK SRS) Explained
UK sustainability reporting standards are the UK’s endorsed versions of ISSB sustainability disclosure standards—UK SRS S1 (general sustainability-related financial information) and UK SRS S2 (climate-related disclosures). For UK businesses tracking mandatory sustainability reporting UK developments, understanding UK SRS, IFRS S1 S2 UK alignment, and current ISSB standards UK implementation status is essential for 2026 planning and beyond.
Regulatory status note (13 October 2026): UK SRS S1 and S2 were finalised in February 2026 and remain available for voluntary use. FCA PS26/19 of 30 September 2026 requires specified listed issuers to comply or explain with those standards for accounting periods beginning on or after 1 January 2027. Current periods remain on the existing TCFD-aligned listed-issuer regime. Confirm current rules before relying on this summary.
Status Summary (June 2026)
| Item | Current position |
|---|---|
| Standards published | UK SRS S1 and UK SRS S2 finalised (February 2026) |
| Voluntary use | Available now for any entity choosing to report |
| Listed-issuer rule | FCA PS26/19: specified listing categories, comply-or-explain from periods beginning 1 January 2027 |
| Basis | Endorsed from IFRS S1 and IFRS S2 with UK-specific amendments |
| Oversight | FRC supports technical endorsement; DBT leads policy |
Direct Answer
UK Sustainability Reporting Standards (UK SRS) are the UK’s sustainability disclosure standards, comprising UK SRS S1 (general sustainability-related financial information) and UK SRS S2 (climate-related disclosures). They are based on IFRS Sustainability Disclosure Standards issued by the ISSB and are intended to provide investor-focused, comparable sustainability disclosure standards UK companies can use in annual reporting. They are available for voluntary use by any entity. Specified listed issuers report on a comply-or-explain basis from accounting periods beginning on or after 1 January 2027 under FCA PS26/19. That listed-issuer rule is not a generic SME mandate.
Key Takeaways
- UK SRS consists of two standards: S1 (general sustainability) and S2 (climate)—closely aligned with IFRS S1 and S2.
- Standards are finalised and available for voluntary use. Specified listed issuers commence from periods beginning 1 January 2027 (first reporting 2028). Optional transition reliefs of one year for Scope 3 and two years for UK SRS S1 have not already expired.
- UK SRS is investor-focused and designed to connect with financial statements—not a replacement for all GRI-style stakeholder reporting.
- S2 climate disclosures build on TCFD’s four-pillar structure; premium listed companies already report TCFD-aligned information.
- Early preparation—data, governance, materiality—reduces cost when mandatory rules take effect.
- Voluntary adoption is permitted now and may help large companies prepare supply chain and investor expectations.
What Are UK Sustainability Reporting Standards?
The ISSB standards UK pathway began at COP26 (2021) when the International Sustainability Standards Board was established under the IFRS Foundation. The ISSB published IFRS S1 and IFRS S2 in June 2023 to create a global baseline for sustainability-related financial disclosures.
The UK government endorsed this approach to support its ambition for the UK as a sustainable finance centre. The endorsement process involved:
- Technical Advisory Committee (TAC) — FRC-supported independent assessment of IFRS S1/S2
- Policy and Implementation Committee (PIC) — coordination across government and regulators
- Public consultation — exposure drafts of UK SRS S1 and S2 (June–September 2025)
- Final standards — published February 2026
UK SRS S1: General Requirements
UK SRS S1 sets general requirements for disclosing sustainability-related risks and opportunities that could reasonably affect enterprise value. It covers:
- Governance processes for sustainability risks and opportunities
- Strategy and business model resilience
- Risk management processes
- Metrics and targets
- Connectivity with financial statements
S1 applies together with topical standards (currently S2 for climate). Additional ISSB topical standards may be endorsed over time.
UK SRS S2: Climate-Related Disclosures
UK SRS S2 requires disclosure of climate-related risks and opportunities, including:
- Governance — board and management oversight of climate risks
- Strategy — impacts on business model, strategy, and financial planning; climate resilience
- Risk management — processes to identify, assess, and manage climate risks
- Metrics and targets — GHG emissions (Scope 1, 2, 3), climate-related metrics, and targets
S2 aligns closely with TCFD recommendations and specifies GHG reporting per the Greenhouse Gas Protocol (with limited exceptions).
Who Will UK SRS Apply To?
Listed-issuer rules follow FCA PS26/19 of 30 September 2026. Unlisted large-company application remains a government policy question. The GOV.UK SRS page may still contain an older consultation sentence.
Likely affected entities (indicative)
| Entity type | Position |
|---|---|
| Specified listed issuers | Comply-or-explain with UK SRS for accounting periods beginning on or after 1 January 2027. Categories named in PS26/19: commercial companies, transition, non-equity shares or non-voting equity shares, and secondary listing or depositary receipts. Current periods stay on the existing TCFD-aligned regime. |
| Economically significant large companies | Government has signalled intent to consult on disclosure for large UK companies (Mansion House speech, November 2024). That consultation is not treated here as a settled mandate. |
| Other companies | Voluntary adoption permitted; supply chain pressure may drive reporting. Availability is not compliance. |
Who is not currently mandated
- Most UK SMEs with no listing or specific regulatory trigger
- Unlisted entities waiting on a government large-company decision
Do not assume a generic SME or unlisted large-company duty from listed-issuer commencement. Check current FCA rules and Companies Act developments for the entity in front of you.
UK SRS vs IFRS S1/S2 vs TCFD
| Aspect | UK SRS | IFRS S1/S2 | TCFD |
|---|---|---|---|
| Issuer | UK (DBT/FRC endorsement) | ISSB / IFRS Foundation | FSB Task Force (disbanded 2023; absorbed into ISSB) |
| Scope | UK-adopted standards | Global baseline | Climate only |
| Mandatory UK status | Specified listed issuers from periods beginning 1 Jan 2027 | N/A (adopted nationally as UK SRS) | Current listed-issuer periods until UK SRS commencement |
| Audience | Investors | Investors | Investors |
| Climate structure | S2 four pillars | S2 four pillars | Four recommendations |
Premium listed companies should map existing TCFD disclosures to UK SRS S2 as rules evolve. See TCFD reporting guide.
Key Dates and Timeline
| Date | Milestone |
|---|---|
| June 2023 | ISSB publishes IFRS S1 and S2 |
| December 2024 | TAC recommends UK endorsement with minor amendments |
| June–September 2025 | UK government consultation on UK SRS exposure drafts |
| February 2026 | Final UK SRS S1 and S2 published; voluntary use available |
| January 2026 | FCA CP26/5 consultation on listing rule sustainability disclosures (closed 20 March 2026) |
| 30 September 2026 | FCA PS26/19: specified listed issuers, comply-or-explain from periods beginning 1 January 2027 |
| 2028 | First UK SRS reports for calendar-year listed issuers in scope |
| TBC | DBT requirements for non-listed large companies |
What Businesses Need to Do: Compliance Checklist
If adopting voluntarily now
- Confirm scope — group boundaries, consolidated entities, value chain approach for Scope 3
- Establish governance — board oversight documented per S1/S2
- Conduct materiality assessment — ISSB financial materiality (not full CSRD double materiality)
- Map climate risks — physical and transition risks; scenario analysis where required
- Measure emissions — Scope 1, 2, and material Scope 3 per GHG Protocol
- Align with financial reporting — connectivity between sustainability and financial statement narratives
- Consider assurance — government consulted on assurance oversight regime (separate consultation)
- Publish disclosures — annual report, sustainability section, or standalone report with UK SRS reference
If preparing for expected mandatory rules
- Gap analysis — compare current TCFD, SECR, and GRI disclosures to UK SRS S1/S2
- Data infrastructure — finance-led controls for sustainability metrics
- Scope 3 prioritisation — identify material categories per S2
- Stakeholder engagement — investor relations briefing on methodology
- Monitor FCA/DBT — subscribe to regulator updates
How UK SRS Relates to Other Frameworks
| Framework | Relationship to UK SRS |
|---|---|
| SECR | SECR provides energy and carbon data that feeds S2 metrics; SECR alone is not sufficient for full UK SRS |
| TCFD | S2 incorporates TCFD pillars; premium listed TCFD reporters have a head start |
| GRI | GRI supports broader stakeholder reporting; may be reported alongside UK SRS with cross-reference |
| CSRD/ESRS | EU double materiality regime; UK companies in EU scope may need both ESRS and UK SRS for different entities |
| CDP | Climate data collection may overlap with S2 metrics |
Hub comparison: Sustainability reporting guide
Examples: Compliant, Incomplete, and Risky Approaches
Strong approach
- Board sustainability committee with documented S2 governance disclosure
- Scope 1, 2, and material Scope 3 quantified with GHG Protocol methodology stated
- Climate scenario analysis with assumptions disclosed
- Clear connectivity between climate risks and financial statement line items
- Restatement policy when methodology changes
Incomplete approach
- TCFD narrative without quantitative emissions data
- Scope 3 described as “immaterial” without analysis
- Governance claimed but no evidence of board-level discussion
- Metrics reported without organisational boundary explanation
Risky approach
- Claiming “UK SRS compliant” before standards mandatory and without full S1/S2 coverage
- Using outdated emissions factors without disclosure
- Selective disclosure of positive climate initiatives only
- Net zero commitment without transition plan or interim targets
UK SRS Disclosure Content: S1 and S2 Overview
UK SRS S1 core disclosure areas
| Area | What investors expect |
|---|---|
| Governance | Who oversees sustainability risks/opportunities; controls and procedures |
| Strategy | How sustainability affects business model, strategy, cash flows, access to finance |
| Risk management | Processes to identify, assess, prioritise, and monitor sustainability risks |
| Metrics and targets | Performance measures and goals for material sustainability topics |
S1 requires disclosure of all material sustainability-related risks and opportunities—not only climate.
UK SRS S2 additional climate requirements
| Area | Key elements |
|---|---|
| Climate governance | Board oversight; management role; skills and training |
| Climate strategy | Risks and opportunities over short, medium, long term; transition plans |
| Climate risk management | Identification, assessment, integration with overall risk management |
| Climate metrics | Scope 1, 2, 3 (when material); industry-based metrics; targets and progress |
S2 requires disclosure of cross-industry and industry-based climate metrics where applicable.
Preparing Data Systems for UK SRS
Finance-led approach
UK SRS is designed for connectivity with financial reporting. Practical steps:
- Add sustainability metrics to management reporting packs
- Align reporting period and consolidation with annual accounts
- Document judgements (materiality, Scope 3 categories, scenario assumptions)
- Implement review controls similar to financial statement close process
- Engage auditors early on assurance readiness
Scope 3 readiness
S2 requires Scope 3 disclosure when material. Prepare category screening before first UK SRS report—see scope 1, 2 and 3 emissions.
Common Mistakes
| Mistake | Consequence |
|---|---|
| Assuming mandatory rules already apply | Under- or over-investment in reporting |
| Treating UK SRS as identical to GRI | Wrong materiality lens and disclosure scope |
| Ignoring Scope 3 | S2 requires disclosure of Scope 3 when material |
| No finance integration | Weak connectivity with financial statements |
| No update process | Regulatory landscape changing through 2026–2027 |
Frequently Asked Questions
What are UK Sustainability Reporting Standards?
UK SRS are the UK’s endorsed sustainability disclosure standards—UK SRS S1 for general sustainability-related financial information and UK SRS S2 for climate-related disclosures—based on ISSB IFRS S1 and S2.
Is UK SRS mandatory in 2026?
Not as a general 2026 filing duty. UK SRS S1 and S2 are available for voluntary use. Specified listed issuers report on a comply-or-explain basis from accounting periods beginning on or after 1 January 2027. Current 2026 periods remain on the existing TCFD-aligned listed-issuer regime.
What is the difference between UK SRS S1 and S2?
S1 sets general requirements for sustainability-related financial disclosures. S2 sets specific climate-related disclosure requirements. Entities reporting climate apply both.
How does UK SRS relate to IFRS S1 and S2?
UK SRS are the UK endorsed versions of IFRS S1 and S2 with amendments recommended by the Technical Advisory Committee and reflected in UK consultation outcomes.
Do UK SRS replace TCFD?
S2 builds on TCFD’s structure. Specified listed issuers remain on the existing TCFD-aligned rules for current periods and move to UK SRS on a comply-or-explain basis from periods beginning 1 January 2027.
Do SMEs need to report under UK SRS?
No. Listed-issuer UK SRS under PS26/19 is not a generic SME duty. SMEs may still face customer or bank requests.
What is financial materiality under UK SRS?
ISSB standards focus on information that could reasonably be expected to affect enterprise value—distinct from CSRD double materiality.
Where can I read the official standards?
UK Government publications page for UK SRS S1 and S2 and UK SRS guidance.
UK SRS and Companies Act Interaction
Mandatory UK SRS application—when finalised—is expected to integrate with existing corporate reporting under the Companies Act 2006 and FCA Listing Rules rather than creating a wholly separate regime. Practically:
- Sustainability disclosures may extend the strategic report or directors’ report
- Connectivity with financial statements will be scrutinised by auditors
- Group reporting concepts should align with consolidated accounts
Monitor FRC guidance on how UK SRS interacts with FRS 102 and IFRS reporters.
Conclusion
UK sustainability reporting standards represent a significant step toward a consistent, investor-focused disclosure regime in the UK. With UK SRS S1 and S2 finalised, any entity may adopt voluntarily. Specified listed issuers commence from periods beginning 1 January 2027. Unlisted large-company application is not treated here as already mandated.
Do not treat “mandatory 2026” as settled law for unlisted companies. Align governance, emissions measurement, and climate risk processes with S2 where that is the chosen or required reference.
Next steps:
- TCFD reporting guide — climate disclosure foundation
- ESG reporting — mandatory vs voluntary landscape
- Scope 1, 2 and 3 emissions — S2 metrics preparation
- Sustainability reporting guide — framework comparison hub
Sources and Update Log
| Date | Update |
|---|---|
| 13 October 2026 | Listed-issuer status updated to FCA PS26/19 (30 September 2026) |
| 24 June 2026 | Article published; reflects February 2026 UK SRS finalisation and FCA CP26/5 consultation |
| 25 February 2026 | UK government published final UK SRS S1 and S2 (gov.uk) |
| 30 January 2026 | FCA opened CP26/5 consultation on sustainability disclosures |
Authoritative sources:
- UK Government — UK Sustainability Reporting Standards guidance
- UK Government — UK SRS S1 and S2 publications
- Financial Conduct Authority — PS26/19: Aligning listed issuers’ sustainability disclosures with international standards
- Financial Conduct Authority — Sustainability reporting requirements
- Financial Conduct Authority — CP26/5 Sustainability disclosures (consultation closed 20 March 2026)
- Financial Reporting Council — Sustainability reporting FAQs
- IFRS Foundation — ISSB Standards
This article is for general information only. Confirm mandatory obligations with qualified advisers and official regulator guidance.