UK sustainability reporting and the implications for Irish business

Stratagem Partners | Position at 23 October 2026

The FCA’s new sustainability disclosure rules give listed companies flexibility over how they report, while extending the information investors can expect beyond climate. For Irish businesses, the consequences depend on their UK listing, group structure and commercial relationships. Boards should establish their exposure now, before the first reporting periods begin in 2027.

What has changed

On 30 September 2026, the Financial Conduct Authority published PS26/19, finalising rules that replace its existing TCFD-aligned listing requirements with reporting against the UK Sustainability Reporting Standards. The standards themselves were published in February; the new development is the FCA’s decision on their application to listed issuers.

The final rules depart from the consultation in two significant respects. Climate disclosures under UK SRS S2 will operate on a comply or explain basis, alongside wider sustainability disclosures under S1 and Scope 3 emissions. Overseas secondary listings and depositary receipt issuers must also report against UK SRS on that basis, rather than merely signposting their home-country requirements.

The shift goes beyond a change of reporting framework. S1 addresses sustainability risks and opportunities that could affect cash flows, access to finance or the cost of capital. Depending on the business, these may arise from water scarcity, biodiversity dependencies, workforce issues or supply-chain disruption. The test is financial materiality, rather than a requirement to report every environmental or social issue. S2 builds on TCFD, with more detailed climate disclosures, including resilience, emissions and financial effects.

Who is directly affected

The rules cover five UK listing categories: commercial company equity shares; international commercial company secondary listings; depositary receipts; non-equity and non-voting equity shares; and transition-category equity shares. The FCA has not introduced an exemption based on company size. Smaller issuers in these categories must therefore address the requirements.

Closed-ended investment funds, open-ended investment companies, shell companies and issuers in the debt, securitised derivatives and miscellaneous securities categories are excluded from these particular rules. Neither FCA authorisation nor an AIM admission alone brings a company into scope. Existing obligations under other reporting regimes must still be assessed separately.

For financial services groups, the distinction matters. PS26/19 allows relevant asset managers, life insurers and pension providers to cross-refer to UK SRS disclosures in their TCFD entity reports where applicable. It does not impose UK SRS on every firm subject to the FCA’s ESG Sourcebook.

What comply or explain means for boards

The reporting obligation remains. An issuer that does not provide S2 disclosures, or provides them only partly, must identify the unmet requirements, explain why and describe any steps it is taking or plans to take towards future disclosure. For non-climate S1 matters, explanations relate to identified risks and opportunities for which disclosures are missing. If none has been identified, the issuer must state that fact.

Management therefore needs an evidenced assessment before choosing its reporting approach. The FCA also reminds issuers that existing requirements to disclose principal risks and uncertainties continue to apply. Choosing to explain under UK SRS does not remove those obligations. Compliance with the FCA’s explain route should also be distinguished from a statement that disclosures fully comply with UK SRS.

Disclosures and explanations belong in the annual financial report, with permitted cross-referencing. Finance and legal teams should review assumptions and forward-looking statements alongside the financial narrative.

The timetable is based on accounting periods

The rules apply to periods beginning on or after 1 January 2027. For a calendar-year company using both principal transitional reliefs, the sequence is as follows.

Period	Report issued	Reporting position
2027	2028	Climate reporting on a comply or explain basis; Scope 3 and non-climate S1 reliefs available.
2028	2029	Scope 3 relief ends; non-climate S1 relief remains available.
2029	2030	Both reliefs have ended; climate and wider sustainability reporting operate on a comply or explain basis.

Using a relief requires a statement identifying it in the annual financial report, without the additional explanation otherwise required for omitted disclosures. The S1 relief concerns non-climate matters; S1 provisions supporting climate reporting still apply. Management should use the relief period to prepare data and controls.

Assurance and transition plans require separate decisions

External assurance is not mandatory. Issuers must disclose whether it was obtained and, if so, the provider, coverage, assurance level, standards used and location of any published assurance report. No explanation is required simply because assurance was not obtained. Boards should weigh voluntary assurance against investor expectations and data readiness.

The FCA does not require companies to produce a climate transition plan. For the commercial, transition, and non-equity/non-voting equity categories, it requires disclosure of whether a plan has been published, where it is available or why none has been published. Overseas secondary listings and depositary receipt issuers are excluded from this separate requirement, although S2 remains relevant to their transition-related disclosures.

What this means for companies operating in Ireland

An Irish-incorporated company with an in-scope UK listing must assess the FCA rules directly. Irish incorporation, or reporting under another framework, does not by itself remove those obligations. An Irish subsidiary within a reporting group may also need to provide information for the group’s disclosures without being independently subject to the listing rules.

For Irish suppliers and borrowers, the likely effect is commercial. Trading with an FCA-regulated business does not, by itself, create a legal duty to publish a UK SRS report. However, a UK customer or lender may seek information to support its own emissions calculations, risk assessments and disclosures. The extent will depend on its reporting obligations and the importance of the relationship.

For example, a listed UK manufacturer may request an Irish supplier’s emissions and production data for purchased-goods calculations, while a lender may seek information about a borrower’s physical climate exposure. These are potential business consequences, not new reporting duties imposed on every Irish counterparty by PS26/19. Contracts and other applicable obligations still need to be considered.

Businesses already preparing ESRS information can reuse relevant data and controls, but should map differences in scope, reporting boundaries and disclosures. UK SRS focuses on financial materiality; ESRS also addresses impacts on people and the environment.

Interoperability supports efficient preparation, not automatic equivalence. The EU’s CSRD value-chain cap should not be assumed to govern a request made for UK SRS reporting.

The decisions management should take now

Boards should confirm the relevant listing category and group boundary, then commission a focused gap assessment against existing disclosures. Finance, sustainability and risk teams should agree the material issues, reporting approach, use of reliefs and evidence needed to support explanations. Procurement and operating teams should establish how missing information will be obtained and checked.

Irish businesses outside direct scope should prioritise significant UK customers, lenders and parent groups. Ask what information they expect, for which period and purpose, before commissioning a standalone report. Agree definitions, methods and responsibilities, and build a reusable dataset with clear controls. Reliable responses can support commercial relationships, but the rules do not guarantee improved financing or contract awards.

The final rules are settled; supporting guidance remains under consultation. Through Primary Market Bulletin 66, the FCA is consulting on Technical Note 803.1 and related changes until 28 October 2026. Executives should use the remaining preparation period to make reporting decisions, allocate resources and test the quality of their information.

Sources:

[1] FCA PS26/19 — pp. 4–6, 16–22, 27–30 and Appendix 1.

[2] UK SRS S1 and S2 — February 2026 standards.

[3] FCA Primary Market Bulletin 66 — section 2; TN 803.1 remains draft.

[4] IFRS Foundation and EFRAG interoperability guidance — use alongside current requirements.

[5] Commission Delegated Regulation (EU) 2026/1560 — recital 4 and Article 3.