UK SRS S1 — General Sustainability Disclosures
Foundational. UK SRS S1sets the disclosure architecture for every material sustainability topic except climate — governance, strategy, risk management and metrics & targets. Voluntary today; proposed comply-or-explain from 1 January 2029 under FCA CP26/5.
UK SRS S1 is the general sustainability disclosure standard — the companion to UK SRS S2 (climate-specific). It sets out how companies should disclose information about all material sustainability topics, not just climate. S1 applies on a comply-or-explain basis from 1 January 2029 for in-scope listed companies, building on the IFRS S1 baseline with six UK-specific amendments.
S1 and S2 explained · Compliance roadmap · Full implementation timeline · Compare to EU CSRD
The foundational sustainability standard
UK SRS S1 sets the disclosure architecture for every material sustainability topic except climate.
Overview: General Sustainability Requirements
UK SRS S1 establishes the foundational framework for sustainability-related financial disclosures across every material sustainability topic except climate.
Published by the Department for Business and Trade (DBT) on 25 February 2026 alongside UK SRS S2, the standard is voluntary for any UK entity today.
Under the FCA's CP26/5 proposals, listed companies move to comply-or-explain from 1 January 2029 — after a two-year transitional relief from the 2027 climate-first phase.
S1 is the architectural anchor for the framework: its materiality, connectivity and value-chain concepts are used by S2 climate disclosures from day one.
For the full UK SRS framework — S1, S2, who must comply, and the implementation timeline — see the UKSRS guide — UK Sustainability Reporting Standards.
This page is the definitive reference for UK SRS S1 itself — what it requires, how its materiality works, how it differs from IFRS S1, and how it relates to UK SRS S2.
For implementation dates and milestones, see the UK SRS timeline. For UK SRS who is in scope by company category, see the dedicated scope page (use UK SRS thresholds for the numerical large-company tests). For the four-pillar disclosure framework see UK SRS requirements, and for FCA Listing Rule progress see the UK SRS consultation tracker. For a step-by-step preparation plan, see the UK SRS compliance guide.
Voluntary now, comply-or-explain proposed for 2029
Available for voluntary adoption today. The FCA's CP26/5 proposes a comply-or-explain start date of 1 January 2029 — subject to the autumn 2026 Policy Statement.
Key conceptual foundations including materiality assessment, connectivity, and value chain analysis apply from January 2027 alongside UK SRS S2 climate disclosures, because S2 cannot be applied in substance without these S1 architectural elements.
UK SRS S1 / DBT government response
Every material sustainability topic — except climate
S1 is topic-agnostic by design. Eight topic clusters cover the field; the materiality test decides which are reportable for a given entity.
What S1 Requires
UK SRS S1 requires disclosure of all sustainability-related risks and opportunities — across every material topic except climate — that could reasonably be expected to affect an entity's cash flows, access to finance, and cost of capital over short, medium and long-term horizons.
Topics in scope include biodiversity, water, workforce, supply chain, human rights, governance and ethics, and resource use.
Climate disclosures are out of S1's scope — they sit in UK SRS S2.
S1 is topic-agnostic by design. It does not enumerate sustainability topics; it requires disclosure of every topic that is material to the entity.
UK SRS S1 architecture
Material topics covered by S1
UK SRS S1 is topic-agnostic by design. It does not enumerate sustainability topics; it requires disclosure of every topic that is material to the entity. In practice, the topics most commonly disclosed under S1 include biodiversity and natural capital, water and marine resources, workforce conditions including health and safety, supply chain and value chain sustainability, human rights, governance and business ethics, and resource use and circular economy.
Each topic is assessed for materiality using the same single (financial) materiality lens — the next section explains how. ICAEW has published practical guidance on operationalising this assessment for UK preparers 2.
Single (financial) materiality — the correct statement
UK SRS S1 uses the ISSB / IFRS S1 single-materiality lens. Information is material if it could influence a primary user's decision about the entity.
Single (Financial) Materiality — The Correct Statement
UK SRS S1 applies single, financial (enterprise-value) materiality on the ISSB / IFRS S1 basis.
Information is material if omitting, misstating or obscuring it could reasonably be expected to influence the decisions of primary users — investors, lenders and other creditors — based on an entity's general-purpose financial reports.
This is not the EU CSRD/ESRS double materiality concept (investor + impact).
SASB Standards are referenced for industry-specific metrics but they are not the materiality basis.
Do not conflate the two.
UK SRS S1 — like IFRS S1 — uses single materiality. The reporting question is: would this information change a primary user's decision about the entity? Primary users are explicitly defined as investors, lenders and other creditors of general-purpose financial reports.
The EU CSRD / ESRS framework uses double materiality, which adds a second test: does the entity have a material impact on the environment or society regardless of financial relevance? UK SRS S1 deliberately does not require this impact-materiality test — DBT's government response sets out the reasoning 3.
For preparers crossing borders, the CSRD vs UK SRS analysis walks through the operational implications of running both lenses.
Information is material if omitting, misstating or obscuring it could reasonably be expected to influence the decisions that primary users of general-purpose financial reports make on the basis of those reports.
UK SRS S1 / IFRS S1 materiality definition
- Single materialityUK SRS S1
- The financial / enterprise-value lens used by IFRS S1 and UK SRS S1. Information is material if it could reasonably be expected to influence the decisions that primary users — investors, lenders and other creditors — make about the entity.
- Double materialityEU CSRD / ESRS
- The two-part EU test: financial materiality plus impact materiality. Adds a second question — does the entity have a material impact on the environment or society, regardless of financial relevance? Not used by UK SRS S1.
- Primary usersIFRS S1 § 2
- Defined as existing and potential investors, lenders and other creditors of an entity's general-purpose financial reports. These are the users whose decision-needs drive the materiality test.
- Enterprise valueMateriality basis
- The sum of an entity's equity value, debt value and other claims — the cash-flow-relevant lens underlying the IFRS S1 / UK SRS S1 materiality test, in contrast to the broader stakeholder-impact lens of ESRS.
Governance · Strategy · Risk · Metrics & targets
The architectural spine that lets S1 cover every topic without prescribing topic-specific templates — and the same spine S2 uses for climate.
Four-Pillar Structure — Governance, Strategy, Risk, Metrics
UK SRS S1 uses the four-pillar architecture introduced by the TCFD and carried into IFRS S1: Governance, Strategy, Risk Management, and Metrics & Targets.
Every material sustainability topic must be disclosed across all four pillars.
This is the spine of the framework — and the same spine UK SRS S2 uses for climate.
The four-pillar structure is what lets S1 cover every sustainability topic without prescribing topic-by-topic disclosure templates. It forces preparers to answer the same four questions for biodiversity, workforce, human rights and so on: who oversees it, how does it affect the business model, how is it managed as a risk, and how is performance measured.
The four-pillar spine is also why UK SRS S2 climate disclosures cannot be applied without S1 in substance — S2 reuses these architectural concepts and the materiality basis from S1.
Linked to the financial statements
S1 requires sustainability disclosures to share entity, period and assumptions with the financial statements — explaining any differences.
Connectivity to the Financial Statements
S1 disclosures must connect to the financial statements — the same reporting entity, the same reporting period, consistent assumptions, and an explanation of any differences.
S1 also provides the architectural concepts (materiality, connectivity, value chain) that S2 climate disclosures rely on, which is why S2 cannot be applied without S1 in substance even though only S2 is currently proposed mandatory.
S2 cannot be applied in substance without S1, even though only S2 is currently proposed mandatory. The architectural concepts come from S1.
DBT government response, February 2026
Connectivity is not a wording requirement — it is an operational requirement. If the sustainability disclosure uses one set of value-chain boundaries and the financial statements use another, the entity must reconcile and explain.
In practice this means S1 implementation pulls finance, sustainability and risk functions together earlier than most companies expect. The UK SRS compliance guide walks through how to staff this and the typical 12–18 month preparation pattern.
Six UK-specific departures from IFRS S1
UK SRS S1 tracks IFRS S1 closely. The six departures adjust effective dates, transitional relief, SASB and GICS, and clarify connectivity to the UK Strategic Report framework.
The Six UK-Specific Amendments to IFRS S1
UK SRS S1 adopts IFRS S1 with six UK-specific amendments documented in the DBT government response.
The amendments adjust effective dates, transitional relief, the role of SASB and GICS, and clarify connectivity to the UK Strategic Report framework.
The standard otherwise tracks IFRS S1 closely so disclosures remain internationally comparable.
S1 vs S2 — side by side
Published together, sharing the same materiality basis and four-pillar spine. They differ in scope, mandatory date and Scope 3 treatment.
S1 vs S2 — Side-by-side
UK SRS S1 and UK SRS S2 are the two UK Sustainability Reporting Standards published together by DBT on 25 February 2026.
They share the four-pillar structure and the single (financial) materiality lens.
They differ in scope (general vs climate-only), mandatory date (2029 vs 2027), and the role of Scope 3 emissions.
If you are scoping a UK SRS programme, both standards apply — S2 first, S1 second.
Practical sequencing for preparers
Most UK SRS readiness programmes work S2 first because S2 is proposed to apply two years earlier under FCA CP26/5 (1 January 2027, subject to the autumn 2026 Policy Statement). But S2 cannot stand alone — its disclosures lean on S1's materiality, connectivity and value-chain concepts.
In practice that means even companies only focused on the 2027 climate deadline still implement the S1 architecture in 2026/2027. The S1 mandatory date in 2029 then formalises what most preparers will already be doing in substance. See the UK SRS compliance guide for the sequenced 12–18 month plan.
S1 vs EU CSRD / ESRS
Different premises produce different operational asks. Single materiality and one standard versus double materiality and twelve — companies in both jurisdictions run both lenses.
S1 vs EU CSRD / ESRS
UK SRS S1 and the EU CSRD/ESRS framework start from different premises.
S1 uses single (financial) materiality and a small number of standards aligned with IFRS S1.
CSRD uses double materiality across 12 ESRS standards covering social, environmental and governance impacts.
Companies operating across both jurisdictions need to run both lenses.
The differences below are the operational ones, not the policy debate.
UK SRS S1 reporting generally satisfies a subset of CSRD/ESRS disclosures. The reverse is not true — the inside-out impact assessment that CSRD requires is not part of S1.
Cross-jurisdiction guidance summary
UK SRS S1 reporting will generally satisfy a subset of CSRD/ESRS disclosures but not the inverse — the inside-out impact assessment that CSRD requires is not part of S1. For deeper coverage see the CSRD vs UK SRS analysis.
Implementation — where to go next
This page is the S1 standard reference. The adjacent topics — timing, scope, FCA mechanics, amendments, step-by-step preparation, and the EU comparison — each have a dedicated page.
Six follow-on guides
Each card below opens a dedicated reference page covering one adjacent topic in depth.
UK SRS implementation timeline
Every UK SRS milestone from voluntary 2026 through S2 mandatory 2027 to S1 comply-or-explain 2029.
ScopeWho is in scope for UK SRS
Entity-type thresholds, FCA Listing Rule triggers, and where the proportionality boundaries currently sit.
RegulatorFCA CP26/5 tracker
Listing-rule mechanics, the autumn 2026 Policy Statement window, and what changes for in-scope listed issuers.
ComplianceUK SRS compliance guide
A 12–18 month sequenced plan covering governance, data systems, materiality assessment, and assurance readiness.
AmendmentsSix UK amendments — full annotation
Each UK-specific departure from IFRS S1 with the underlying paragraphs and the DBT rationale, side by side.
Cross-borderCSRD vs UK SRS
Operational differences for preparers running both lenses — single vs double materiality, standard count, assurance.
Frequently asked questions
Every answer links to a primary source or the dedicated internal page. Re-verify the dates before quoting — the FCA Policy Statement expected autumn 2026 may change them.
Frequently Asked Questions
The questions this page answers — every answer links to a primary source or the dedicated internal page.
Coverage: what S1 requires, mandatory dates, S1 vs S2, the materiality basis, the six UK amendments, assurance, and connectivity.
If you want the timeline question specifically, see the dedicated UK SRS timeline page.
What does UK SRS S1 cover?
UK SRS S1 covers general requirements for disclosing sustainability-related financial information across every material sustainability topic except climate. Climate sits in UK SRS S2.
Topics that fall under S1 include biodiversity and natural capital, water and marine resources, workforce health and safety, supply chain labour conditions, human rights, governance and business ethics, and resource use. The full ISSB/IFRS S1 baseline is published by the IFRS Foundation 1.
Is UK SRS S1 mandatory?
No — not yet. S1 is currently voluntary for any UK entity. Under the FCA's CP26/5 proposals 2, in-scope listed companies move to comply-or-explain for S1 from 1 January 2029.
The full mandatory timeline for the UK SRS framework — including S2 climate from 2027 and Scope 3 from 2028 — is on the UK SRS timeline.
When does UK SRS S1 apply?
For mandatory application: financial years beginning on or after 1 January 2029, on a comply-or-explain basis under the FCA Listing Rules — subject to the FCA Policy Statement expected autumn 2026 3.
For voluntary application: now, since 25 February 2026 when DBT published the final standards 4. Early adoption is all-or-nothing — entities must produce a full statement of compliance.
What is the difference between UK SRS S1 and UK SRS S2?
S1 is the general standard covering every material sustainability topic. S2 is the climate-specific standard. The full side-by-side is in the comparison table above on this page.
The headline split (per FCA CP26/5 proposals, subject to the autumn 2026 Policy Statement): S2 would become mandatory for in-scope listed issuers on 1 January 2027 (with Scope 3 excluded in year one); S1 would follow on comply-or-explain on 1 January 2029. See UK SRS S2 for the climate detail, or UK SRS S2 and S1 comprehensive overview for the complete framework.
What materiality does UK SRS S1 use?
UK SRS S1 uses single (financial / enterprise-value) materiality on the ISSB / IFRS S1 basis. Information is material if omitting, misstating or obscuring it could reasonably be expected to influence the decisions that primary users — investors, lenders and other creditors — make on the basis of an entity's general-purpose financial reports 5.
This is not the EU CSRD/ESRS double materiality concept (investor + impact). SASB Standards are referenced under S1 for industry-specific metrics, but they are not the materiality basis — see the CSRD vs UK SRS comparison.
How does UK SRS S1 differ from IFRS S1?
UK SRS S1 adopts IFRS S1 with six UK-specific amendments: UK effective dates replace ISSB dates; first-year transitional relief is removed; climate-first relief is reworked to match the UK 2027/2029 phasing; SASB "shall" is softened to "may"; the GICS classification requirement is removed; and connectivity to financial statements is clarified for the UK Strategic Report framework.
The full list and rationale is in the DBT government response 6. Cross-reference with UK SRS amendments.
Does UK SRS S1 require assurance?
No mandatory assurance is proposed in the initial phase. Under FCA CP26/5, in-scope companies must disclose whether they obtained third-party assurance (disclose-or-explain). UK practitioners use ISSA (UK) 5000.
Mandatory assurance is under separate UK Government consultation with no fixed date. Do not assume reasonable assurance becomes mandatory in 2030 — that timeline is unconfirmed. The FRC's Interim Sustainability Assurance Register is the live oversight mechanism 7. More on sustainability assurance.
How does UK SRS S1 connect to the financial statements?
S1 requires that sustainability disclosures and the financial statements share the same reporting entity, same reporting period, and consistent assumptions. Any differences must be explained.
S1 also provides the architectural concepts — materiality, connectivity, value chain — that S2 relies on. S2 cannot be applied in substance without S1, even though only S2 is currently proposed mandatory. See the UK SRS compliance guide for how to operationalise this in practice.
Related guides & references
UK SRS S2 — Climate-related Disclosures
Climate-specific standard. Proposed mandatory for in-scope listed issuers from 1 January 2027 under FCA CP26/5; Scope 3 from 2028 (comply-or-explain).
UK SRS Compliance Guide
Step-by-step roadmap for the S1/S2 phased approach, governance, data and assurance readiness.
UK SRS Implementation Timeline
Full regulatory timeline from voluntary 2026 through mandatory S1 in 2029.