The UK government published its final Sustainability Reporting Standards — UK SRS S1 and UK SRS S2 — on 25 February 2026. For UK-listed companies, mandatory climate disclosure is now firmly on course for financial years beginning 1 January 2027. Boards and CFOs who have not yet appointed a lead, mapped their Scope 1–3 emissions, or reviewed their governance frameworks have, at most, one reporting cycle to get this right.

This is not a compliance exercise that belongs solely in the sustainability team. The FCA’s proposed Listing Rule changes, the board-level governance requirements embedded in UK SRS S1, and the investor pressure building around credible climate transition plans make this a board-level accountability matter — today, not in 2027.

What Are UK SRS S1 and S2 — and Who Do They Apply To?

UK SRS S1 and UK SRS S2 are the UK government’s endorsed sustainability reporting standards, based on the International Sustainability Standards Board (ISSB) standards IFRS S1 and IFRS S2. They were developed by the UK Sustainability Disclosure Technical Advisory Committee and published by the Department for Business and Trade in February 2026.

UK SRS S1 sets general requirements for disclosing sustainability-related financial information across four pillars: governance, strategy, risk management, and metrics and targets. It covers all sustainability-related risks and opportunities that could reasonably affect a company’s cash flows, access to finance, or cost of capital. UK SRS S2 focuses specifically on climate: physical and transition risks, climate scenario analysis, and greenhouse gas emissions across Scopes 1, 2, and 3.

The FCA launched a consultation in January 2026 proposing to amend the UK Listing Rules so that UK SRS S2 climate disclosures become mandatory for UK-listed companies from financial years beginning on or after 1 January 2027. Wider sustainability disclosures under UK SRS S1 and Scope 3 emissions would initially operate on a “comply or explain” basis. The FCA’s Policy Statement is expected in autumn 2026 — boards should not wait for that to begin preparation.

Executive Action:

• Confirm whether your company falls within the FCA’s proposed scope — UK-listed commercial companies, including premium and standard segment issuers — and assign a named board-level owner for UK SRS readiness.
• Brief the audit committee now: UK SRS S1’s governance pillar requires boards to disclose how sustainability risks are overseen at the highest level. If that process doesn’t exist in documented form, it needs to.
• Commission a gap analysis against UK SRS S2 before year-end to identify data collection weaknesses, particularly on Scope 3 supply chain emissions.

Why Is the Timeline More Urgent Than Most Boards Realise?

Research published by PwC in early 2026 found that fewer than 40% of FTSE 350 companies had completed a structured assessment against the ISSB standards — the global framework on which UK SRS is directly modelled. With the FCA Policy Statement expected in autumn 2026 and mandatory reporting applying to financial years starting January 2027, companies with December year-ends have fewer than 12 months to build compliant reporting infrastructure from the point rules are confirmed.

The challenge is compounded by data. According to analysis from Slaughter and May’s 2026 horizon scanning report, Scope 3 emissions — which UK SRS S2 will ultimately require — span a company’s entire value chain: purchased goods, business travel, employee commuting, and end-of-life product treatment. For most organisations, this data does not currently exist in a form suitable for annual report disclosure. Building it requires supplier engagement programmes, new measurement methodologies, and in most cases, third-party assurance frameworks.

Boards that treat UK SRS readiness as a 2026 year-end project will find themselves in difficulties. This is an 18-month infrastructure build, not a disclosure drafting exercise.

Executive Action:

• Put UK SRS readiness on the board calendar for Q3 2026 — timed to receive management’s gap analysis ahead of the FCA Policy Statement.
• Engage your external auditors or advisers on assurance requirements: while third-party assurance is not yet mandated, investor expectations are moving faster than the regulatory timeline.
• Review your investor relations narrative — institutional investors aligned with ISSB globally will assess your climate disclosures against a standard you may not yet be tracking.

What Does the Governance Requirement Actually Mean for the Board?

Under UK SRS S1, companies must disclose the governance body or bodies responsible for oversight of sustainability-related risks and opportunities — and describe how those bodies exercise oversight. In practice, this means the board must be able to demonstrate active engagement, not delegated awareness. Disclosures will need to cover how sustainability considerations are incorporated into strategy and capital allocation decisions, how management is held accountable, and how the board stays informed on sustainability performance.

For many UK boards, this requires structural change. A sustainability sub-committee with no clear reporting line to the main board, or a CSR function operating independently of finance, will not satisfy the governance pillar disclosure requirements. Boards need to be able to evidence the process — meeting papers, minutes, management information — in a form that external assurance providers and auditors can review.

The Companies Act 2006 already requires directors to have regard to environmental impact in their Section 172 duties. UK SRS S1 operationalises this at a disclosure level: the question is no longer whether the board considers sustainability — it is whether that consideration is structured, documented, and integrated into financial decision-making.

Executive Action:

• Map your existing board governance structure against the UK SRS S1 governance pillar requirements — identify where oversight is informal or undocumented.
• Consider whether the audit committee or a dedicated ESG sub-committee should hold formal responsibility, with a clear terms of reference update before year-end 2026.
• Ensure the CFO is directly involved: UK SRS disclosure sits in the annual report and accounts, and the financial relevance test embedded in the standards means CFO sign-off on materiality assessments is expected.

How Should CFOs Approach the Financial Integration of Sustainability Data?

UK SRS is explicit that sustainability-related financial information must be connected to the financial statements. This is a significant shift from many current sustainability reporting frameworks, which treat ESG disclosures as a separate narrative exercise. Under UK SRS S1, companies must describe how sustainability risks and opportunities affect their financial position, financial performance, and cash flows — now and over short, medium, and long-term horizons.

For CFOs, this means integrating sustainability data into financial planning and analysis processes. Climate scenario analysis under UK SRS S2 requires companies to assess their resilience to at least two scenarios — one consistent with global warming of 1.5°C, and one representing a higher-warming pathway. These scenarios must be connected to credible financial modelling of assets, liabilities, and revenues at risk.

INFORMD has been tracking UK SRS developments since the ISSB published its global standards in 2023 and will continue to brief senior finance leaders as the FCA’s autumn 2026 Policy Statement approaches. This is the financial reporting transformation of the decade — and it lands in the CFO’s office.

Executive Action:

• Review your long-range financial planning models to assess where climate-related assumptions are currently absent or informal — UK SRS S2 scenario analysis will require these to be explicit and auditable.
• Engage your investor relations and treasury teams: cost of capital and credit rating methodologies are already incorporating climate disclosure quality as an assessment factor.
• Identify whether your current finance technology stack can generate the granular Scope 1–3 emissions data and scenario outputs UK SRS S2 will require — most enterprise systems were not built for this.

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Frequently Asked Questions

What is the difference between UK SRS and TCFD reporting?

TCFD (Task Force on Climate-related Financial Disclosures) was the UK’s previous mandatory climate disclosure framework for large listed companies and financial institutions. UK SRS S2 supersedes and significantly expands TCFD — requiring more granular emissions data, quantitative scenario analysis, and explicit connections to financial statements. TCFD-aligned disclosures are a useful foundation, but companies that stop there will not meet UK SRS requirements.

Are UK SRS standards currently mandatory?

As of June 2026, UK SRS S1 and S2 are published and available for voluntary adoption. The FCA’s consultation proposes making UK SRS S2 climate disclosures mandatory for UK-listed companies from financial years beginning 1 January 2027, subject to a final Policy Statement expected in autumn 2026. Boards should treat preparation as mandatory now — the consultation signals regulatory direction clearly.

Which companies will be required to report under UK SRS?

The FCA’s January 2026 consultation proposes mandatory UK SRS S2 reporting for UK-listed commercial companies — including those on the premium and standard segments of the London Stock Exchange. The standards are also expected to apply to UK-incorporated large private companies and financial institutions under separate government proposals to be consulted on in due course. Unlisted businesses with listed debt or significant listed subsidiaries should also review their exposure.

How does UK SRS relate to the EU’s Corporate Sustainability Reporting Directive (CSRD)?

UK SRS and CSRD are separate frameworks developed for different jurisdictions, though both draw on ISSB’s global standards as a reference point. UK companies with EU operations may face dual reporting obligations — CSRD for EU-regulated or large EU-subsidiary activity, and UK SRS for their London-listed entity. CFOs and General Counsel at multinational UK firms should map their obligations across both regimes: they are compatible in structure but differ in scope, materiality definitions, and assurance requirements.

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