The UK has endorsed its own set of sustainability reporting standards — the UK Sustainability Reporting Standards (UK SRS) — based on the global ISSB framework with UK-specific modifications. For listed companies, mandatory reporting is expected to begin for accounting periods starting on or after 1 January 2027.
With the FCA's consultation (CP26/5) now closed and final rules expected in autumn 2026, UK companies have a narrowing window to prepare. This guide covers the current status, who is in scope, the phased implementation, and what the materiality assessment involves.
What Are the UK Sustainability Reporting Standards?
The UK SRS consist of two standards, endorsed by the UK government in February 2026 and available for voluntary use immediately:
- UK SRS S1 (General Sustainability-Related Disclosures): Requires disclosure of sustainability-related risks and opportunities that could affect the entity's financial position and prospects. Based on IFRS S1.
- UK SRS S2 (Climate-Related Disclosures): Requires specific disclosures on climate-related risks and opportunities. Based on IFRS S2.
The UK SRS adopt a financial materiality approach only — focusing on sustainability matters that are relevant to investors and other primary users of financial reports. This is distinct from the EU's CSRD, which requires double materiality (both financial and impact perspectives).
FCA Consultation and Expected Timeline
The Financial Conduct Authority (FCA) published consultation paper CP26/5 in January 2026, proposing to update the UK Listing Rules to incorporate mandatory UK SRS reporting. The consultation closed on 20 March 2026, and the FCA aims to publish final rules in autumn 2026.
Proposed Phased Implementation
The FCA has proposed a phased approach to mandatory reporting:
| Requirement | Mandatory From | Basis |
|---|---|---|
| UK SRS S2 (climate disclosures) | Accounting periods beginning on or after 1 January 2027 | Mandatory |
| Scope 3 emissions (under UK SRS S2) | 1 January 2028 | Comply or explain |
| UK SRS S1 (broader sustainability) | 1 January 2029 | Comply or explain |
The "comply or explain" approach for Scope 3 and UK SRS S1 means companies must either make the required disclosures or explain which specific paragraphs they have not complied with and why.
Who Is in Scope?
Initially, the FCA's proposals apply to companies with UK-listed securities in the commercial, non-equity, and transition listing categories. This covers approximately 515 primary-listed issuers.
The UK government is expected to consult during 2026 on extending mandatory UK SRS reporting to the UK's largest private companies, though no timetable has been confirmed.
UK SRS vs. TCFD: The Transition
UK listed companies are already familiar with TCFD-aligned climate disclosures, which have been mandatory since 2022 under existing FCA rules. The UK SRS effectively replaces TCFD as the reporting framework, building on the same four-pillar structure (Governance, Strategy, Risk Management, Metrics and Targets) but with more detailed and prescriptive requirements.
Key differences from TCFD reporting include:
- More specific disclosure requirements — UK SRS S2 goes beyond TCFD's recommendations with granular requirements on scenario analysis, climate resilience, and transition plans.
- Industry-specific metrics — The ISSB's industry-based guidance (derived from SASB standards) provides sector-specific disclosure topics and metrics. See our detailed guides for financial services, oil & gas, and real estate.
- Explicit materiality assessment — While TCFD encouraged materiality-based reporting, UK SRS formalises the requirement for a structured financial materiality assessment.
- Assurance trajectory — The FCA is expected to introduce assurance requirements over time, moving toward mandatory external verification.
Companies that have been producing high-quality TCFD reports will have a head start, but should expect to expand the depth and specificity of their disclosures significantly.
The Materiality Assessment Under UK SRS
UK SRS requires companies to assess which sustainability-related risks and opportunities are material to primary users of financial reports — investors, lenders, and creditors. Information is material if omitting or misstating it could reasonably be expected to influence their decisions.
Financial Materiality: The UK Approach
Unlike the EU's double materiality requirement, the UK SRS focuses exclusively on financial materiality. You are assessing:
- How climate and sustainability matters create risks that could negatively affect your financial performance, position, or prospects
- How they create opportunities that could positively affect your financial outlook
- Whether these effects are significant enough to influence investor decisions
This is a narrower scope than CSRD but still requires a structured, documented assessment process. The fact that UK SRS uses single materiality does not mean the assessment is simple — it requires careful judgment about which risks and opportunities matter financially, over what time horizons, and with what degree of certainty.
Practical Assessment Steps
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Start with your existing TCFD disclosures. Review what climate risks and opportunities you have already identified. Assess whether the scope is comprehensive enough for UK SRS requirements.
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Broaden the lens for UK SRS S1. While UK SRS S2 (climate) is the first mandatory requirement, companies should start thinking about UK SRS S1 topics (workforce, supply chain, biodiversity, etc.) on a comply-or-explain basis from 2029.
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Use industry guidance. The ISSB's industry-based metrics (based on SASB standards) provide a structured starting point for identifying relevant risks and opportunities in your sector.
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Assess financial materiality systematically. For each identified risk or opportunity, evaluate the potential magnitude of financial impact, the likelihood of occurrence, and the time horizon. Document your thresholds and rationale.
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Prepare for assurance. Even though assurance requirements are not yet finalised, building a documented, auditable assessment process now will reduce friction when external verification is required.
How to Prepare: A Practical Roadmap
Phase 1: Now to Autumn 2026
- Monitor the FCA's final rules publication (expected autumn 2026) for any changes from the consultation proposals.
- Conduct a gap analysis comparing your current TCFD disclosures against UK SRS S2 requirements.
- Begin your materiality assessment to identify which climate risks and opportunities you will need to disclose.
- Brief your board on the new requirements and establish clear governance structures for sustainability oversight.
Phase 2: Autumn 2026 to January 2027
- Finalise your materiality assessment and determine which climate-related disclosures are required.
- Build or update data collection processes for metrics and targets, including Scope 1 and Scope 2 emissions.
- Develop climate scenario analysis capabilities if not already in place.
- Engage with auditors and assurance providers to understand expectations.
Phase 3: FY2027 Onwards
- Prepare your first UK SRS S2 disclosure as part of your annual financial report.
- Begin preparing for Scope 3 (comply-or-explain from January 2028) by mapping your value chain emissions and assessing data availability.
- Plan for UK SRS S1 (comply-or-explain from January 2029) by broadening your materiality assessment to cover non-climate sustainability topics.
How Materiality Master Can Help
Materiality Master provides a structured workflow for conducting ISSB-aligned materiality assessments — directly applicable to the UK SRS financial materiality approach. The platform guides you through identifying sustainability-related risks and opportunities, assessing their financial materiality, and producing documented outputs suitable for your annual report.
For advisory firms helping clients transition from TCFD to UK SRS, the multi-client dashboard enables consistent, scalable delivery across your portfolio. Learn more about UK SRS materiality assessments or see pricing and plans.
Frequently Asked Questions
Will UK SRS replace TCFD reporting?
Yes. The FCA's proposals would replace the current TCFD-aligned Listing Rules with UK SRS-based requirements. Companies already reporting under TCFD will transition to the more detailed UK SRS framework. The four-pillar structure (Governance, Strategy, Risk Management, Metrics and Targets) remains the same, but disclosure requirements are more prescriptive.
Do UK companies also need to comply with the EU's CSRD?
The CSRD applies to companies within its scope based on EU presence, not UK listing. UK-headquartered companies with significant EU operations or subsidiaries may have CSRD obligations in addition to UK SRS. The materiality approaches differ — UK SRS uses financial materiality while CSRD requires double materiality. Companies subject to both will need to manage two parallel frameworks.
Will UK SRS apply to private companies?
Not initially. The FCA's current proposals cover UK-listed companies only (~515 issuers). However, the UK government has indicated it will consult during 2026 on extending mandatory UK SRS reporting to the largest private companies. No confirmed scope or timeline is available yet.
What assurance standards will apply?
The FCA has not yet finalised assurance requirements for UK SRS disclosures. However, the trajectory is toward mandatory external assurance, likely starting with limited assurance and progressing to reasonable assurance over time — consistent with international trends.
