When must you comply?

The UK SRS deadline — the short answer

The key UK SRS deadline is 1 January 2027: that is the proposed mandatory start date for UK SRS S2 (climate) disclosures by in-scope listed companies under FCA CP26/51, with UK SRS S1 (general) following on a comply-or-explain basis from 1 January 2029.

UK SRS has been available for voluntary adoption since 25 February 2026, so there is no deadline for early adopters.

For the full year-by-year view see our UK SRS timeline.

The four UK SRS deadline categories

The UK sustainability reporting standards timeline shows UK SRS deadlines falling into four categories1: voluntary adoption (available immediately), CP26/5 proposed mandatory compliance (listed companies), comply-or-explain requirements (phased implementation), and MCR Strand 2 anticipated mandatory requirements (private companies).

For the complete regulatory framework explaining these categories, see our UK SRS regulations guide.

Each category has distinct timelines and compliance obligations.

The staggered approach allows entities to begin with climate disclosure under UK SRS S21 before expanding to broader sustainability topics under UK SRS S1.

This progression aligns with existing TCFD disclosure experience and builds toward comprehensive sustainability reporting over a multi-year transition3.

Filing deadlines for UK SRS disclosure follow the Companies Act 2006 section 442 framework6 when UK SRS sits within the Strategic Report.

This creates alignment between sustainability disclosure timing and existing annual reporting obligations, ensuring integrated disclosure rather than separate sustainability reporting timelines.

Voluntary adoption — no deadline

UK SRS S1 and S2 are available for voluntary adoption by any UK entity immediately following publication on 25 February 20261.

Voluntary adoption has no deadline restrictions or compliance obligations beyond the standards' own requirements.

Voluntary adopters benefit from early implementation experience, stakeholder positioning, and preparation for anticipated mandatory requirements2.

Early adoption also supports value chain readiness — suppliers to listed companies in CP26/5 scope may voluntarily adopt UK SRS to provide Scope 3 data infrastructure for customer reporting obligations.

The FRC FAQ7 confirms that voluntary UK SRS adoption requires compliance with the full standards as published — entities cannot adopt selected portions or apply modified requirements.

Voluntary adopters must state their UK SRS adoption clearly in disclosure and apply either UK SRS S1, UK SRS S2, or both standards comprehensively.

CP26/5 proposed mandatory effective dates

FCA CP26/53 proposes mandatory UK SRS S2 application for listed companies in scope of UKLR categories 6, 14, 15, 16, and 22 for accounting periods beginning on or after 1 January 2027.

This proposed mandatory deadline applies to climate-related financial disclosure under UK SRS S2 specifically.

The January 2027 effective date means that entities with December year-ends will first apply UK SRS S2 for their 2027 annual report (filed by June 2028 for PLCs, September 2028 for private companies per section 4426).

Entities with March year-ends beginning 1 April 2027 or later will apply UK SRS S2 for that reporting period.

Comply-or-explain deadlines under CP26/5

UK SRS S1 application follows a comply-or-explain approach under CP26/53 for accounting periods beginning on or after 1 January 2029.

Entities must apply UK SRS S1 OR provide explanation for non-application.

The comply-or-explain approach allows phased implementation while establishing clear expectations for broader sustainability disclosure.

Comply-or-explain requires substantive explanation rather than brief statements7.

Entities choosing to explain non-application must address: specific reasons for non-application; alternative sustainability disclosure approach adopted; and timeline for potential future UK SRS S1 adoption.

Generic explanations citing complexity or resource constraints alone are insufficient.

The two-year gap between UK SRS S2 proposed mandatory (2027) and UK SRS S1 comply-or-explain (2029) allows entities to focus initially on climate disclosure infrastructure and then expand to broader sustainability topics2.

This sequencing reflects stakeholder feedback emphasising practical implementation constraints for simultaneous application across climate and non-climate sustainability topics.

Scope 3 deferral structure

CP26/53 proposes Scope 3 GHG emissions disclosure deferral allowing entities to defer Scope 3 reporting for one year following UK SRS S2 proposed mandatory application, with an option for one additional year of deferral. This structure recognises Scope 3 data collection complexity and supplier engagement requirements.

Under the proposed deferral structure, entities beginning UK SRS S2 application from 1 January 2027 may defer Scope 3 disclosure until their second annual report (covering periods beginning 1 January 2028) with potential further deferral until the third annual report (periods beginning 1 January 2029).

Entities must explain their deferral use and describe Scope 3 preparation activities during the deferral period.

Scope 3 deferral applies only to GHG emissions disclosure under UK SRS S21 — other climate-related metrics and targets disclosure remains subject to the general UK SRS S2 proposed mandatory deadline.

Entities may apply Scope 3 deferral partially — for example, disclosing selected material Scope 3 categories while deferring others subject to data collection constraints.

FCA Policy Statement expected autumn 2026

The FCA expects to publish its Policy Statement on CP26/53 in autumn 2026, confirming final rules for listed company sustainability disclosure.

The Policy Statement will establish definitive effective dates, scope, and compliance requirements following consultation feedback analysis.

The autumn 2026 Policy Statement timing provides entities with approximately three months' notice before the proposed 1 January 2027 effective date for accounting periods beginning on or after that date.

Entities preparing for UK SRS S2 application should monitor Policy Statement publication for final rule confirmation and any adjustments to proposed timelines or requirements.

Key Policy Statement elements will include3: final effective dates for UK SRS S2 and S1 application; confirmed UKLR category scope; Scope 3 deferral final structure; and assurance requirements (if any) for sustainability disclosure.

The Policy Statement represents the final regulatory step before UK SRS implementation for listed companies.

MCR Strand 2 anticipated deadlines

MCR Strand 28 will establish mandatory sustainability disclosure requirements for private companies, anticipated for implementation 2028 or later.

The MCR Written Ministerial Statement indicates that private companies will follow listed company implementation with appropriate timing adjustment for smaller entity capacity.

MCR Strand 2 scope and deadlines remain to be determined through future government consultation and legislation.

The programme will likely apply to large private companies first, with potential extension to medium-sized companies depending on implementation experience and stakeholder capacity8.

Private companies preparing for MCR Strand 2 mandatory requirements may begin UK SRS implementation immediately through voluntary adoption1.

Early voluntary implementation provides practical experience, system development time, and demonstration of proactive sustainability disclosure commitment ahead of mandatory requirements.

Filing deadlines via CA 2006 s.442

When UK SRS disclosure sits within the Strategic Report under Companies Act 2006 section 414A4, the section 442 filing deadlines apply6: 9 months after financial year-end for private companies and LLPs (section 442(2)(a)), 6 months after financial year-end for public limited companies (section 442(2)(b)).

Section 442 filing deadlines create alignment between UK SRS disclosure timing and existing annual reporting obligations.

UK SRS disclosure cannot be filed separately from the annual report — it must be included within the Strategic Report and filed as part of the integrated annual reporting package2.

The section 442 deadline framework means that UK SRS preparation timelines must align with existing annual reporting cycles.

Entities should plan UK SRS data collection, analysis, and disclosure preparation to meet their applicable Companies Act filing deadline rather than attempting separate sustainability reporting schedules.

How filing deadlines interact with UK SRS

UK SRS disclosure integration with Companies Act 2006 filing deadlines6 requires coordination between sustainability teams, finance teams, and external advisers.

Sustainability data collection and analysis must complete in time for Strategic Report preparation and annual report finalisation within the section 442 deadline framework.

For entities with December year-ends applying UK SRS S2 from 1 January 2027, the first UK SRS disclosure will be due by 30 June 2028 (PLCs) or 30 September 2028 (private companies).

This creates a practical timeline requiring UK SRS data collection and analysis completion by spring 2028 to allow Strategic Report drafting and annual report finalisation.

Section 414CB(2A)5 designation means that UK SRS S2 compliance satisfies the Companies Act climate-related financial disclosure requirements.

Entities applying UK SRS S2 need not provide additional climate disclosure to meet section 414CB(1)-(5) obligations — UK SRS S2 application fulfils both UK SRS and Companies Act climate disclosure requirements simultaneously.

Late filing penalties via CA 2006 s.453

Late filing of UK SRS disclosure within the Strategic Report triggers Companies Act 2006 section 453 civil penalties6: £150 (up to 1 month late), £375 (1-3 months), £750 (3-6 months), or £1,500 (over 6 months) for private companies; doubled amounts for PLCs with maximum £7,500 penalty.

Repeat late filing doubles all penalty amounts.

Section 453 penalties apply automatically for late filing regardless of UK SRS disclosure completion status.

Entities cannot avoid penalties by filing annual reports without UK SRS content — the penalty attaches to late filing of the complete annual report including all required components.

Criminal liability under Companies Act 2006 section 4514 applies for failure to file annual reports including UK SRS content.

Directors face potential criminal liability (unlimited fine) for non-filing, emphasising the importance of UK SRS preparation timeline alignment with Companies Act obligations.

Practical timeline planning

UK SRS implementation timeline planning should work backward from applicable filing deadlines6 to establish data collection, analysis, and disclosure preparation schedules.

Entities need 3-6 months for UK SRS disclosure preparation depending on current sustainability data infrastructure and reporting experience.

For entities beginning UK SRS S2 application from 1 January 2027, practical timeline planning requires: data collection completion by autumn 2027; sustainability analysis and metric calculation by winter 2027/28; and disclosure drafting by spring 2028.

This timeline allows Strategic Report integration and annual report finalisation within section 442 deadlines.