Voluntary adoption of UK SRS — the Wave 0 pathway

Voluntary adoption — Wave 0

UK SRS S1 and UK SRS S21 have been available for voluntary use by any UK entity since publication by the Department for Business and Trade on 25 February 2026. The standards are freely available; no registration, notification, or approval is required to commence voluntary application — it is purely an internal entity decision.

Voluntary adoption is "Wave 0" of UK SRS application — preceding the mandatory waves37:

• Wave 0 (Voluntary, current) — Any UK entity may voluntarily apply UK SRS S1 and S2 from 25 February 2026
• Wave 1 (Mandatory listed, 1 January 2027) — UK SRS S2 mandatory for listed companies in UKLR 6/14/15/16/22 under FCA CP26/5
• Wave 2 (Comply-or-explain S1, 1 January 2029) — UK SRS S1 broader sustainability application on comply-or-explain basis for in-scope listed companies
• Wave 3 (Anticipated mandatory private, 2028+) — Subject to MCR Strand 2 consultation expected during 2026; possible Companies Act 2006 amendments to extend application to economically significant private companies

The government has positioned voluntary adoption9 as best practice preparation for the mandatory waves to come — building data infrastructure, governance capability, and disclosure experience ahead of mandatory deadline pressure.

Who voluntarily adopts and why

Voluntary adoption of UK SRS1 is open to any UK entity — listed companies, private companies, LLPs, charities, public sector bodies, and overseas-incorporated entities with UK operations. The decision-making factors vary by entity type, but five common scenarios emerge:

Five voluntary adoption scenarios

The five voluntary adoption scenarios that most commonly drive the decision:

Scenario 1 — Large private companies anticipating MCR Strand 2

Large private companies anticipating inclusion under MCR Strand 27 often adopt voluntarily to build capability before mandatory application. Typical sub-scenarios:

• PE-backed companies preparing for next funding cycle — investors increasingly require UK SRS-aligned data
• Family businesses with active stakeholder engagement — voluntary disclosure supports community and employee relationships
• Pre-IPO companies — voluntary adoption ahead of listed company application reduces IPO-cycle implementation risk
• Sub-£500m turnover companies — anticipating threshold reduction in MCR Strand 2

See Private Companies and UK SRS for detailed coverage of the MCR Strand 2 expectations and five positioning strategies.

Scenario 2 — Suppliers to large UK customers

Suppliers to FTSE 100 / FTSE 250 companies in mandatory CP26/53 scope frequently adopt UK SRS voluntarily to support customer Scope 3 disclosure obligations. Large customers in mandatory scope must disclose Scope 3 emissions across 15 GHG Protocol categories; supplier data is required for substantive disclosure. Voluntary supplier adoption of UK SRS1 produces UK-compatible disclosure that customers can reference in their own reporting.

Scenario 3 — Sector leaders demonstrating thought leadership

Industries with stronger sustainability differentiation — energy, materials, consumer brands, financial services — often see sector leaders voluntarily adopt UK SRS1 for brand positioning. Voluntary disclosure under a recognised standard provides investor communications credibility and supports market leadership signalling. The reputational dimension typically outweighs the implementation cost for established brands.

Scenario 4 — UK subsidiaries of overseas parents already disclosing under ISSB-aligned frameworks

UK subsidiaries of overseas parents already applying IFRS S112 / S213 or equivalent ISSB-aligned standards have data infrastructure already in place. Voluntary UK SRS1 adoption produces UK-specific compliance output with minimal additional implementation work. Particularly relevant for subsidiaries of US, EU, Australian, Japanese, and other jurisdictions where ISSB-aligned reporting is mandatory or established practice.

Scenario 5 — Public sector and charitable bodies

Academy trusts, large charities, NHS Trusts, and other public sector bodies often adopt voluntary UK SRS-aligned disclosure to support:

• Existing public sector ESG framework alignment
• Procurement transparency requirements (public sector tenders increasingly include sustainability questions)
• Donor accountability for charitable bodies
• Stakeholder transparency for staff, beneficiaries, community

Public sector entities are out of mandatory UK SRS1 scope under CP26/53 and MCR7, but voluntary adoption is supported by DBT guidance9.

The voluntary adoption mechanics

The mechanics of voluntary UK SRS1 adoption are straightforward — there is no formal process beyond the entity's own decision and implementation. Eight steps:

• Confirm voluntary adoption decision — typically board-level discussion supported by management recommendation
• Identify which standards to apply — UK SRS S2 (climate) typically first; UK SRS S1 (broader sustainability) follows
• Determine reporting placement — UK SRS disclosure typically within Strategic Report or Directors' Report; may also appear in standalone sustainability report cross-referenced from Strategic Report
• Reference UK SRS clearly — required for section 414CB(2A) designation to apply; statement of compliance or partial compliance with named standards
• Apply reliefs as needed — but disclose which reliefs are being relied on and why; provide additional information about relief application
• Build governance capability — board-level oversight, management responsibility, materiality assessment process
• Consider voluntary assurance under ISSA (UK) 5000 — typically limited assurance over Scope 1 and 2 emissions first; broader scope in subsequent years
• Plan year-on-year capability build — Wave 0 voluntary adopters can scale disclosure quality and scope over multiple reporting periods

Unlike SECR or ESOS10, voluntary UK SRS1 application does NOT require notification to a regulator. Companies House, FCA, and FRC operate quality oversight where UK SRS sits within the Strategic Report — but no separate registration process exists.

Section 414CB(2A) for voluntary adopters

Section 414CB(2A) of the Companies Act 20065 applies to voluntary adopters of UK SRS S21 on the same basis as mandatory in-scope listed companies. The FRC Sustainability Reporting FAQ4 confirms:

"The Government has confirmed that UK SRS S2 is a national reporting framework and that it will not be necessary for UK entities to duplicate climate-related financial disclosure requirements, under section 414CB(2A) of the Companies Act 2006, so long as use of UK SRS S2 is clearly referenced in the NFSIS, and existing NFSIS requirements relating to climate-related financial disclosures set out in section 414CB (1)-(5) of the Companies Act 2006 are met. This applies regardless of whether UK SRS is applied on a mandatory or voluntary basis."

Practical effect for voluntary adopters in scope of the CFD regime (traded companies, banking, insurance, 500+ employees with £500m turnover or balance sheet)5:

• Voluntary application of UK SRS S2 satisfies the climate-related financial disclosure requirements under section 414CB(1)-(5)
• No separate duplicate CFD regime disclosure required
• Two conditions: (i) UK SRS S2 use clearly referenced in the NFSIS; (ii) existing section 414CB(1)-(5) requirements remain met
• Operationally significant — voluntary adopters in CFD regime scope reduce duplicate disclosure burden

This is the only formal cross-regime simplification confirmed to date2. SECR, ESOS, and FCA SDR continue to operate alongside UK SRS1 pending future regulatory development.

Four reliefs available

Under UK SRS S11 and S21 as published, four reliefs are available — and (per UK Amendment 2 to IFRS S1/S2) no time references are attached to relief application in the standards themselves2. Voluntary adopters may rely on these reliefs indefinitely.

Relief 1 — Non-climate reporting relief

UK SRS S1 paragraph E31 allows entities to focus on climate disclosure (UK SRS S2) in initial reporting periods, deferring broader sustainability topics. Voluntary adopters may rely indefinitely. Mandatory in-scope listed entities under CP26/53: comply-or-explain on S1 from 1 January 2029.

Relief 2 — Scope 3 emissions relief

UK SRS S21 allows entities to defer Scope 3 emissions disclosure. Voluntary adopters may rely indefinitely under the standards. Mandatory in-scope listed entities under CP26/53: first-year deferral plus optional additional one-year deferral, then comply-or-explain.

Relief 3 — GHG Protocol relief

UK SRS S21 provides jurisdictional relief from the GHG Protocol Corporate Standard where an entity is required to use a different method for measuring GHG emissions. Expanded under the ISSB December 2025 amendments (incorporated into UK SRS via Amendment 6)2. Particularly relevant for entities with operations in jurisdictions requiring alternative GHG Protocol approaches.

Relief 4 — Comparative information relief

Paragraph E4(b) of UK SRS S11 provides that comparative information for wider sustainability matters is only required in the second annual reporting period in which the entity no longer applies the non-climate reporting relief — rather than immediately on first transition from relief application.

Compliance statements when relying on reliefs

Voluntary adopters relying on UK SRS reliefs must adjust their compliance statements accordingly. UK SRS S11 includes provisions limiting the ability to make full compliance statements OR requiring additional information when an entity is relying on reliefs2.

Practical compliance statement options:

• Full UK SRS compliance — when no reliefs are being relied on; statement of full compliance with UK SRS S1 and/or S2
• Partial UK SRS compliance — when one or more reliefs are being applied; statement identifying which reliefs are being applied and why, with additional disclosure as required by paragraphs E3, E4, and E6 of UK SRS S1
• Compliance with UK SRS S2 only — voluntary adopters in Year 1 typically apply UK SRS S2 only with reference to UK SRS S1 framework principles; statement reflects scope of application

The compliance statement is significant for several reasons: (1) supports section 414CB(2A)5 designation by clearly referencing UK SRS S2 use; (2) provides stakeholder transparency about disclosure scope; (3) avoids overstatement liability under section 4636 by accurately describing what has been applied.

Section 463 director protection

Section 463 of the Companies Act 20066 provides director safe harbour for false or misleading statements in the Strategic Report, Directors' Report, and certain other reports. Directors are only liable to compensate the company for losses caused by an untrue or misleading statement, or by dishonest concealment, if they knew of the falsity, were reckless about it, or knew an omission was dishonest concealment.

The Government Response to the UK SRS Consultation2 confirms that section 4636 applies automatically to UK SRS disclosure included in the Strategic Report — whether the application is mandatory or voluntary.

For voluntary adopters, section 4636 protection is particularly significant because voluntary adoption often includes substantial forward-looking content:

• Scenario analysis under UK SRS S2 paragraph 22 — modelling of business model resilience under climate scenarios
• Anticipated financial effects under UK SRS S2 paragraphs 14-15 — forward-looking estimates of climate-related impacts on cash flows and balance sheet
• Transition plan disclosure under UK SRS S2 paragraph 14(a)(iii) — forward commitments and target setting
• Target progress and forward projections under UK SRS S2 paragraphs 33-36

Section 4636 provides safe harbour for good-faith disclosure of these forward-looking elements — directors are protected from compensation liability for honest mistakes, only being liable for knowing falsity, recklessness, or dishonest concealment. The protection is automatic and does not require any specific statement by the directors.

Climate-First sequencing

The recommended sequencing for voluntary adoption is "Climate-First" — apply UK SRS S21 for climate disclosure first; add UK SRS S11 broader sustainability coverage in later years.

Rationale11:

• TCFD continuity — most large UK companies have existing TCFD-aligned climate disclosure infrastructure; UK SRS S2 builds on this directly
• Mandatory before voluntary — UK SRS S2 is proposed mandatory under CP26/5 from 1 January 2027; voluntary adoption tracks the mandatory wave
• Materiality threshold — climate-related risks typically pass the financial materiality threshold for most companies; non-climate sustainability topics require separate materiality assessment
• Data infrastructure — climate emissions data infrastructure (Scope 1, 2, 3) is more mature than broader sustainability metrics for most entities
• Assurance availability — ISSA (UK) 5000 applies to both, but practitioner experience is greater on climate disclosure
• Section 414CB(2A) designation — applies specifically to UK SRS S2, providing the cross-regime simplification benefit

Typical sequencing across multiple reporting cycles:

• Year 1 — Voluntary UK SRS S2 application; use relief options as needed; reference UK SRS clearly in Strategic Report
• Year 2 — Refine UK SRS S2 application; consider voluntary limited assurance under ISSA (UK) 5000; begin UK SRS S1 materiality assessment for non-climate topics
• Year 3 — Add UK SRS S1 application for material non-climate topics; broaden assurance scope
• Year 4+ — Mature UK SRS S1 + S2 application across all material sustainability topics; consider reasonable assurance over key disclosures

MCR Strand 2 preparation

Voluntary UK SRS1 adoption is increasingly framed as strategic preparation for the Modernising Corporate Reporting (MCR) Strand 2 mandatory expansion7. The MCR Written Ministerial Statement (21 October 2025)7 confirmed that MCR Strand 2 will consult on extending UK SRS application to economically significant private companies.

Anticipated MCR Strand 2 timeline72:

• Consultation expected during 2026 (specific date not yet announced)
• Likely to address thresholds (turnover, employee count, balance sheet)
• Likely to address entity scope (private companies, LLPs, PE-portfolio companies, family businesses)
• Likely to address timing of mandatory application
• Earliest realistic effective date: 2028 or later, given consultation timelines and legislative passage through Companies Act 2006 amendments

Voluntary adopters benefit from MCR Strand 2 preparation in several ways:

• Capability development ahead of mandatory deadline pressure
• Data infrastructure built progressively across multiple voluntary cycles
• Board governance integrated before regulatory enforcement risk
• Materiality assessment process refined through iterative application
• Disclosure templates and processes proven before mandatory implementation
• Assurance arrangements developed where appropriate

See Private Companies and UK SRS for detailed coverage of the MCR Strand 2 expectations and five positioning strategies for private companies.

Frequently asked questions