TCFD vs UK SRS — What Changes When UK Sustainability Reporting Standards Replace TCFD

This is the single biggest practical change in the transition from TCFD to UK SRS, and it warrants careful attention from boards and audit committees. Under the TCFD regime, the FCA required premium-listed companies to state whether their disclosures were “consistent with” or “aligned to” the TCFD recommendations. In practice, this language allowed substantial latitude. Companies could — and routinely did — claim partial alignment, disclosing against some recommendations while omitting others. The FCA conducted thematic reviews highlighting inconsistent quality, but the comply-or-explain mechanism did not carry the same weight as a formal compliance requirement.

UK SRS replaces this with a formal statement of compliance. Companies must either comply with all disclosure requirements of UK SRS S2 or, where they do not comply with a specific requirement, individually identify that requirement and provide a clear explanation of why compliance was not achieved. This is not a general narrative — it is a requirement-by-requirement assessment. The statement of compliance will be included in the Strategic Report and will be visible to investors, regulators, and auditors as part of the statutory filing.

For reporting teams, this means that every disclosure requirement in UK SRS S2 must be mapped, assessed, and either satisfied or formally explained. There is no middle ground of “partial alignment.” Audit committees will need to review the statement of compliance with the same rigour they apply to financial reporting judgements. Companies that previously relied on general TCFD alignment statements will need to build detailed compliance matrices and ensure that each requirement is tracked through to the final report.

The TCFD recommended that companies use climate-related scenario analysis to inform their strategic planning and risk management disclosures. The recommendation was deliberately flexible — it did not prescribe specific scenarios, time horizons, or methodological approaches. The result was predictable: the majority of TCFD disclosures contained qualitative scenario narratives that described possible future states but stopped short of quantifying the financial impact on the business. The FCA’s own reviews noted that many companies treated scenario analysis as a stand-alone narrative exercise rather than a tool that genuinely informed strategy.

UK SRS S2 changes this materially. Scenario analysis is mandatory, and it must be financially quantified. Companies are required to use at least two climate scenarios, and the range must include a 1.5°C-aligned pathway. Both physical risks (for example, extreme weather events, sea-level rise, chronic temperature changes) and transition risks (policy and regulatory changes, technology shifts, market repricing) must be addressed. The analysis must cover short, medium, and long-term time horizons, which the company must define and disclose.

Critically, the scenarios must demonstrably inform the company’s strategy and risk management disclosures. It is not sufficient to present scenario analysis as an appendix or a separate analytical exercise. The standard requires companies to explain how the outputs of their scenario analysis have influenced strategic decisions, capital allocation, and risk mitigation measures. This requires genuine integration between sustainability teams, risk functions, and strategic planning — not just a consultant-produced scenario report stapled to the annual report.

Companies that have only performed qualitative scenario analysis will need to invest in quantitative modelling capabilities, whether internally or through specialist advisers. They will also need to establish clear governance over scenario selection, assumptions, and the translation of scenario outputs into financial impacts. The board and audit committee should expect to review and challenge the scenario analysis before it is disclosed.

Scope 3 emissions — those arising from a company’s value chain rather than its own operations — have been the most contentious area of climate disclosure since the TCFD recommendations were first published. TCFD recommended Scope 3 disclosure “where material,” but this soft framing, combined with genuine measurement challenges, meant that many companies either omitted Scope 3 entirely or disclosed only a narrow subset of categories with limited methodological transparency.

UK SRS S2 takes a fundamentally different approach. There is a one-year transitional relief period: Scope 3 disclosure is not required for reporting periods beginning before 1 January 2028. After that date, Scope 3 becomes comply-or-explain. Companies must disclose Scope 3 emissions across all 15 categories of the GHG Protocol Corporate Value Chain (Scope 3) Standard where those categories are material. If a company determines that a category is not material, it must explain why.

The burden of proof has shifted. Under TCFD, non-disclosure of Scope 3 was the default for many companies and attracted limited scrutiny. Under UK SRS, non-disclosure requires a specific, category-by-category justification. Companies must also disclose the methodologies, data sources, and data quality indicators used for each reported category. This means that the common practice of reporting a single Scope 3 number without methodological transparency will no longer be acceptable.

Practical preparation should start well before the 2028 compliance date. Companies need to map their value chains against all 15 GHG Protocol categories, conduct materiality assessments for each category, select and document methodologies (including emission factors and allocation approaches), and establish data collection processes with key suppliers. For companies in sectors with complex supply chains — retail, manufacturing, financial services — this is a multi-year effort that should be underway now.

One of the most significant structural changes in the move from TCFD to UK SRS is the requirement for financial connectivity — a demonstrable, auditable link between sustainability disclosures and the financial statements. The TCFD encouraged this connection in principle, noting that climate risks should be reflected in financial planning. In practice, however, the vast majority of TCFD reports existed as self-contained sections with no explicit connection to the numbers in the income statement, balance sheet, or cash flow statement.

UK SRS S2 makes financial connectivity mandatory. Companies must show how climate-related risks and opportunities flow through to their financial statements. This includes, where relevant, the impact on asset valuations (for example, the carrying value of property, plant and equipment in climate-exposed locations), provisions (such as environmental remediation or decommissioning obligations), impairments (of goodwill, intangible assets, or stranded assets), and forward-looking financial estimates (revenue projections, capital expenditure plans, cost of capital assumptions).

This requirement has significant implications for the relationship between sustainability and finance teams. In most organisations, TCFD reporting has been led by the sustainability function with limited input from finance. Under UK SRS, the CFO and financial controller will need to be directly involved in the preparation of sustainability disclosures, because the disclosures must be consistent with — and explicitly linked to — the financial statements they oversee. Auditors will scrutinise whether the narrative in the sustainability disclosures is consistent with the assumptions and judgements underpinning the financial statements.

Companies should begin by identifying the specific financial statement line items that are most affected by climate-related risks and opportunities, and then establishing clear processes for ensuring that sustainability and financial reporting teams are working from the same assumptions. This is not a cosmetic cross-referencing exercise — it requires substantive alignment of climate risk assessments with financial reporting judgements.

Under the TCFD regime, companies had considerable flexibility in where they placed their climate disclosures. Some included them in the annual report, others published standalone TCFD reports, and some placed disclosures on their corporate website. This flexibility was pragmatic during the early years of TCFD adoption, but it created inconsistency for investors trying to locate and compare disclosures across companies. It also meant that disclosures placed outside the annual report did not benefit from the legal protections available to statutory filings.

UK SRS mandates that all sustainability disclosures be included in the Strategic Report within the Annual Report and Accounts. This is a statutory filing location — the document is filed with Companies House and forms part of the company’s legal record. There is no option to publish UK SRS disclosures in a standalone report or on a website in lieu of the Strategic Report.

The benefit of this approach is that disclosures made in the Strategic Report benefit from the liability protections of section 463 of the Companies Act 2006. Under s463, directors are not liable to third parties for loss arising from statements in the Strategic Report unless the statement is untrue or misleading and the director knew it to be untrue or misleading, or was reckless as to whether it was. This provides a meaningful safe harbour for forward-looking statements and estimates, which are inherent in climate-related disclosures.

For companies that previously published TCFD disclosures outside the annual report, the transition to UK SRS will require a restructuring of reporting processes to ensure that all sustainability content is prepared, reviewed, and approved on the same timeline as the financial statements. This has knock-on implications for internal timetables, board approval processes, and auditor engagement timelines.

For companies that have been reporting under TCFD, the transition to UK SRS is not starting from scratch — but it is not a minor update either. The following is a practical gap analysis of the key areas where existing TCFD reporters will need to enhance their processes, data, and disclosures.

1. Quantify scenario analysis. If your existing scenario analysis is qualitative — descriptive narratives of possible futures without financial quantification — it will not meet UK SRS requirements. You need financially quantified scenario analysis covering at least two scenarios including a 1.5°C pathway, addressing both physical and transition risks over defined time horizons. Budget for modelling support if you do not have in-house capability.
2. Prepare Scope 3 methodology and data collection. Even with the one-year transitional relief, companies should be mapping value chain emissions now. Assess all 15 GHG Protocol categories for materiality. Identify data sources, select emission factors, and document methodological choices. Engage key suppliers on data provision. This work takes 12 to 18 months for most companies, so starting after the transitional period expires is too late.
3. Establish a financial connectivity process. Create a formal process for ensuring that climate risk assessments are reflected in financial statement assumptions and judgements. This typically requires joint working between the sustainability team, the financial controller, and the external auditor. Identify the specific line items affected and document how climate assumptions flow through to valuations, provisions, and impairments.
4. Prepare the formal statement of compliance. Map every disclosure requirement in UK SRS S2 against your current reporting. Identify gaps. For each gap, determine whether you can achieve compliance or whether you will need to provide an explanation of non-compliance. Build a compliance matrix that can be reviewed by the audit committee and maintained year on year.
5. Move disclosures into the Strategic Report. If your TCFD disclosures currently sit outside the Annual Report and Accounts — in a standalone report, a website section, or an appendix — they must be relocated into the Strategic Report. Align the preparation timetable with the financial reporting cycle. Ensure that the board approval process covers sustainability disclosures alongside the financial statements.
6. Review transition plan disclosure. If your company has not published a climate transition plan, you must either prepare one or draft a clear explanation of why one is not yet available. Companies that have published a transition plan should review it for consistency with UK SRS S2 requirements and the TPT Framework.

None of these changes can be implemented in the final quarter before the compliance date. Companies with reporting periods beginning on 1 January 2027 should be well into preparation by mid-2026 at the latest. The compliance date is a deadline for the first reporting period, not the date by which preparation should begin.