UK Sustainability Reporting Standards (UK SRS): What Businesses Need to Know in 2026

Executive Summary

The UK government published the final UK Sustainability Reporting Standards - UK SRS S1 and UK SRS S2 - on 25 February 2026, marking a decisive shift in how British companies will disclose sustainability and climate-related financial information. Built on the ISSB's global baseline (IFRS S1 and S2), these standards replace the fragmented landscape of SECR and TCFD-aligned reporting with a single, internationally coherent framework. The FCA is already consulting on making UK SRS S2 mandatory for listed companies from January 2027.

For CFOs, finance directors, and sustainability leads - including those at SMEs within larger supply chains - understanding these standards now is not optional. This guide explains what UK SRS requires, how it compares to existing frameworks, and what practical steps your organisation should take to prepare.

What Are the UK Sustainability Reporting Standards?

The UK Sustainability Reporting Standards (UK SRS) are the UK-endorsed versions of the IFRS Sustainability Disclosure Standards issued by the International Sustainability Standards Board (ISSB). They comprise two standards:

UK SRS S1 - General Requirements for Disclosure of Sustainability-related Financial Information. This establishes the overarching framework for disclosing all sustainability-related risks and opportunities that could reasonably be expected to affect a company's cash flows, access to finance, or cost of capital.

UK SRS S2 - Climate-related Disclosures. This focuses specifically on climate-related physical risks, transition risks, and climate-related opportunities. It integrates and builds upon the recommendations of the now-disbanded Task Force on Climate-related Financial Disclosures (TCFD).

The UK government developed these standards through a Technical Advisory Committee (TAC) and a Policy and Implementation Committee (PIC), with a public consultation on exposure drafts running from June to September 2025. The finalised standards were published on 25 February 2026 and are now available for voluntary use. Mandatory adoption will follow through FCA rule changes and potential Companies Act reforms.

A critical design principle of UK SRS is financial materiality - disclosures focus on how sustainability and climate issues affect enterprise value, rather than on an organisation's broader impact on the environment and society. This distinguishes the UK approach from the EU's double-materiality model under the Corporate Sustainability Reporting Directive (CSRD).

How UK SRS Aligns with ISSB (S1 and S2 Explained)

UK SRS S1 and S2 closely mirror IFRS S1 and IFRS S2, with narrow UK-specific amendments. The government has retained the core structure, definitions, and disclosure requirements of the ISSB standards, making UK SRS highly interoperable with the global baseline now adopted or under consideration in approximately 40 jurisdictions worldwide.

UK SRS S1: General Sustainability Disclosures

S1 requires entities to disclose information about sustainability-related risks and opportunities across all material topics - environmental, social, and governance - where those issues could reasonably be expected to influence investor decisions. It establishes the foundational disclosure architecture upon which S2 builds.

UK SRS S2: Climate-Specific Disclosures

S2 narrows the lens to climate. It requires disclosure of physical risks (acute and chronic), transition risks (policy, legal, technology, market, and reputational), and climate-related opportunities. It incorporates the TCFD framework's core structure while going further in requiring greenhouse gas emissions data, scenario analysis, and climate resilience assessments.

Key UK-Specific Amendments

The UK has introduced several targeted modifications to the ISSB baseline:

• Climate-first transitional relief: Entities may focus solely on climate-related disclosures (S2) for the first two reporting periods, with broader sustainability disclosures under S1 required from the third year onward.
• Industry classification flexibility: The mandatory use of the Global Industry Classification Standard (GICS) has been removed. Entities may use any appropriate industry classification to disaggregate disclosures.
• SASB standards made voluntary: References to SASB industry-specific standards are now optional rather than prescribed.
• Alignment of reporting timing: Sustainability disclosures are to be connected to and consistent with an entity's financial statements, reinforcing the principle that sustainability data should be reported alongside, not separately from, financial performance.

This interoperability means that a company reporting under UK SRS will produce disclosures substantially aligned with the global ISSB baseline, reducing the reporting burden for multinational businesses operating across jurisdictions.

The Four Pillars of UK SRS: Governance, Strategy, Risk Management, and Metrics & Targets

Both UK SRS S1 and S2 are structured around the same four core content areas inherited from the TCFD framework:

Governance. How the organisation's governance bodies oversee and manage sustainability-related and climate-related risks and opportunities. This includes board-level accountability, management roles, and the integration of sustainability into decision-making processes.

Strategy. How sustainability-related and climate-related risks and opportunities affect the organisation's business model, strategy, and financial planning. Under S2, this extends to climate scenario analysis and transition planning.

Risk Management. The processes an entity uses to identify, assess, prioritise, and monitor sustainability-related and climate-related risks. Disclosure should demonstrate how these processes integrate with enterprise-wide risk management.

Metrics and Targets. The quantitative measures used to assess performance against sustainability-related and climate-related risks and opportunities. Under S2, this includes mandatory disclosure of Scope 1, Scope 2, and Scope 3 greenhouse gas emissions, measured in line with the GHG Protocol Corporate Standard.

These four pillars ensure a structured, comparable approach to disclosure that investors can use to assess how well-governed, strategically resilient, and operationally prepared a business is in the face of sustainability-related challenges.

How UK SRS Compares to TCFD and ESRS

Understanding the relationship between UK SRS and other major frameworks is essential for organisations navigating multiple reporting obligations.

The key takeaway: TCFD is now effectively superseded. Its recommendations have been absorbed into IFRS S2 and by extension UK SRS S2. Companies currently reporting under TCFD should view UK SRS as the natural evolution, not a replacement from scratch, but a more rigorous and codified successor.

For companies with EU exposure, the primary difference lies in materiality. ESRS requires reporting on both how sustainability issues affect the business (financial materiality) and how the business affects the world (impact materiality). UK SRS requires only the former. Organisations subject to both regimes will need to layer additional impact disclosures for EU compliance on top of their UK SRS reporting.

Will UK SRS Become Mandatory?

Yes, although the timeline is phased and the scope is still being determined.

The FCA published Consultation Paper CP26/5 on 30 January 2026, proposing to replace existing TCFD-aligned Listing Rules with UK SRS-aligned requirements. The proposed mandatory timeline for listed companies is:

• 1 January 2027: UK SRS S2 climate disclosures become mandatory (excluding Scope 3) for accounting periods beginning on or after this date.
• 1 January 2028: Scope 3 emissions reporting required on a comply-or-explain basis.
• 1 January 2029: UK SRS S1 (non-climate sustainability disclosures) required on a comply-or-explain basis.

The FCA consultation closes on 20 March 2026, with a final Policy Statement expected in autumn 2026.

Beyond listed companies, the government is exploring whether to extend UK SRS requirements under the Companies Act to large private companies and potentially certain financial institutions. The Department for Business and Trade (DBT) has written to the FCA regarding implementation matters, and the establishment of the Audit, Reporting and Governance Authority (ARGA) is expected to bring a mandatory assurance regime for sustainability disclosures in due course.

What This Means for UK SMEs

UK SRS will not initially apply directly to most SMEs. The first wave of mandatory reporting targets listed companies and large entities.

However, the indirect effects will be significant and should not be underestimated:

Supply chain requirements. Large companies reporting under UK SRS S2 must disclose Scope 3 emissions , which include upstream and downstream emissions throughout their value chain. This means SMEs that supply goods or services to in-scope companies will increasingly be asked to provide emissions data, carbon intensity metrics, and evidence of climate risk management.

Investor and lender expectations. As UK SRS normalises structured sustainability disclosure, banks, investors, and insurers will begin applying similar expectations to mid-market and growth-stage businesses. Access to capital may increasingly depend on disclosure readiness. Our free Green Loan Readiness Check gives an indicative view of how prepared your evidence is before approaching a lender.

Tender and procurement criteria. Public and private sector procurement processes are already incorporating sustainability criteria. Organisations that can demonstrate alignment with recognised standards, including UK SRS and ISSB, will hold a competitive advantage.

Voluntary early adoption. The UK SRS standards are now freely available for any entity to use on a voluntary basis. SMEs that adopt the framework early will be better positioned when requirements cascade down through regulation or commercial expectation.

For SMEs, the commercial case for early engagement is clear: structured, credible sustainability data is becoming a prerequisite for doing business with larger organisations, not merely a compliance obligation. If you are unsure how long the process takes, our guide on how long carbon reporting actually takes for a UK SME breaks it down by company profile. And if a client has already asked for your data, start with what to do when a client asks for your carbon data.

Why Early Preparation Matters

Regardless of whether your organisation falls within the first mandatory cohort, the operational groundwork for UK SRS compliance takes time to build properly. Several areas warrant immediate attention:

Data governance. UK SRS requires auditable, decision-useful sustainability data. This demands robust internal controls, clear data ownership, and documented methodologies, particularly for emissions calculations and climate risk assessments.

Scope 1, 2, and 3 emissions measurement. Scope 1 and 2 data typically relies on internal energy and fuel consumption records. Scope 3, covering supply chain, business travel, waste, and other indirect emissions, requires multi-year capability building and supplier engagement. A phased roadmap is essential.

Audit trail and assurance readiness. The UK government is developing a mandatory assurance regime through ARGA. Even before formal assurance requirements take effect, organisations should be building the evidence trails, source documentation, and internal controls that auditors will expect.

Climate risk disclosure. Scenario analysis and resilience assessments under S2 require a clear understanding of how physical and transition risks affect business strategy. This is not a one-off exercise but an ongoing analytical capability.

Target tracking and transition planning. While transition plans are not yet mandatory, the FCA's proposals require listed companies to disclose whether they have published one. Setting credible, measurable targets now, and tracking progress against them, demonstrates strategic maturity to investors and stakeholders.

Organisations that invest in these foundational capabilities now will avoid the rushed, reactive compliance that often produces poor-quality disclosures and erodes stakeholder confidence.

Preparing for UK SRS: Practical Steps for Finance and Sustainability Teams

For finance directors, sustainability leads, and CFOs looking to move from awareness to action, a structured approach is recommended:

1. Conduct a gap analysis. Compare your current disclosures (whether SECR, TCFD, or voluntary) against the UK SRS S1 and S2 requirements. Identify where data, processes, or governance structures fall short.
2. Establish data infrastructure. Ensure that emissions data, across all three scopes, is collected, calculated, and stored in a structured, auditable format. Invest in systems that can produce disclosure-ready outputs aligned with the GHG Protocol and UK SRS metrics.
3. Assign governance accountability. UK SRS requires clear board-level and management oversight of sustainability risks. Define roles, responsibilities, and reporting lines now.
4. Build Scope 3 capability. This is typically the most data-intensive and challenging area. Begin supplier engagement, establish data collection protocols, and develop a realistic multi-year maturity plan. Our Scope 3 guide covers the practical steps.
5. Integrate sustainability into financial reporting. UK SRS is designed to sit alongside financial statements. Work with your finance team and auditors to ensure sustainability disclosures are connected to, and consistent with, your annual report.
6. Monitor the regulatory trajectory. Track the FCA's Policy Statement (expected autumn 2026), any Companies Act developments from DBT, and the emerging ARGA assurance framework.

Platforms designed for carbon accounting and climate reporting , such as EcoHedge, can play a practical role in this process by helping SMEs structure their emissions data, align calculations with ISSB and UK SRS requirements, and generate outputs that are ready for disclosure, audit, and stakeholder reporting. For organisations without large in-house sustainability teams, having the right tooling in place can make the difference between meaningful preparation and last-minute scrambling.

Frequently Asked Questions

Is UK SRS mandatory?

Not yet for all entities. The final standards were published on 25 February 2026 for voluntary use. The FCA has proposed making UK SRS S2 mandatory for listed companies from accounting periods beginning on or after 1 January 2027, with broader requirements phased in through 2029. The government is also exploring extending requirements to large private companies under the Companies Act.

Who must comply with UK SRS?

Initially, UK-listed companies across the equity shares (commercial), equity shares (transition), and international secondary listing categories will be in scope under the FCA's proposals. The government may subsequently extend requirements to large private companies and financial institutions through legislative reform.

How is UK SRS different from TCFD?

UK SRS builds on the TCFD framework. The four core pillars of Governance, Strategy, Risk Management, and Metrics & Targets are retained. However, UK SRS goes further by codifying detailed disclosure requirements, mandating Scope 1, 2, and 3 emissions reporting, requiring scenario analysis, and providing a legally enforceable standard rather than voluntary recommendations. The TCFD was formally disbanded in 2023, with its work absorbed into IFRS S2 and now UK SRS S2.

Does UK SRS apply to SMEs?

There is no current proposal to mandate UK SRS for SMEs directly. However, SMEs will face increasing indirect pressure through supply chain disclosure requirements (particularly Scope 3), lender expectations, and procurement criteria. The standards are available for voluntary adoption by any entity.

When will UK SRS become mandatory?

For listed companies, the FCA proposes mandatory UK SRS S2 climate disclosures from 1 January 2027. Scope 3 reporting follows on a comply-or-explain basis from 2028, and UK SRS S1 non-climate disclosures from 2029. For non-listed entities, the timeline depends on future Companies Act amendments, which have not yet been formally proposed.