Thought Leadership

What are the UK sustainability reporting standards (UK SRS)?

The UK Sustainability Reporting Standards (UK SRS) are the new set of disclosure requirements which were finalised in February 2026. Designed to provide a global baseline for transparency, they guide organisations on disclosing sustainability-related financial information and climate-related risks and opportunities.

The standards do not exist in isolation; they are the UK-endorsed versions of the International Sustainability Standards Board (ISSB) framework. Specifically, UK SRS S1 (General Requirements) and UK SRS S2 (Climate-related Disclosures) mirror the global International Financial Reporting Standards (IFRS) S1 and S2 standards, but with narrow UK-specific amendments to ensure they align seamlessly within the UK's existing legal and corporate reporting landscape.

At their core, the emphasis of these standards is on financial materiality - bridging the gap between a company’s sustainability performance and its impact on financial disclosures. By connecting non-financial data with cash flow and risk profiles, the SRS aim to give investors a more synergistic view of a company’s long-term resilience.

The SRS will form a core pillar of the UK Government’s Sustainability Disclosure Requirements (SDR), which aim to increase corporate transparency, allow for easier comparison between companies, and crack down on greenwashing.

Who will be impacted?

As of 25^th February 2026, the implementation timeline for the UK SRS has officially been formalised. There is set to be a phased rollout as per the following breakdown:

• The Immediate Wave (Voluntary) – any UK-based entity (private or listed) can start reporting on UK SRS S1 and S2 now. Early adoption is being encouraged by government as “best practice” to prepare for mandatory years ahead.
• The First Mandatory Wave (Listed Companies) – the accounting period for listed companies begins on 1^st January 2027, with first reports due in 2028. *

*Notably, there is a “Climate-First” rule which requires companies to report on UK SRS S2 (Climate) first. Broader sustainability reporting (UK SRS S1) is optional until 2029.

• The Second Mandatory Wave (Large Private Entities) – companies meeting at least 2 of the following 3 metrics will fall within the accounting period starting on 1^st January 2028 (first reports due 2029).
  • o >250 employees,
  • o >£54m turnover
  • o a balance sheet total of >£27m

Will disclosures be audited?

The UK government and the Financial Conduct Authority (FCA) have adopted a “transparency first” approach to the new standards. For accounting periods starting 1 January 2027, in-scope companies must include a specific statement in their annual report declaring whether their sustainability disclosures have been independently assured.

While the government has introduced this as a “disclose or explain” requirement - meaning companies must state their assurance status but are not yet legally forced to obtain it - the market expectation for quality data is high. Following this initial transparency phase, Mandatory Limited Assurance is expected to be phased in for accounting periods starting in 2028/29, with a transition to full, audit-level Reasonable Assurance targeted from 2030 onwards.

What to report?

The focus of SRS will be to encourage the reporting that discloses on four key pillars:

• Governance: How your board oversee sustainability and climate-related risks and opportunities.
• Strategy: How climate-related risks and opportunities impact business operations, strategy and financial planning over the short, medium and long term.
• Risk Management: The business processes in place to identify, assess and manage sustainability and climate-related risks and how these can be integrated into financial risk management.
• Metrics and Targets: Qualitative KPIs and targets measuring sustainability performance. This can include but is not limited to emissions data (Scope 1, 2 and 3), transition planning and climate-related scenario analysis to test business resilience.

Steps to be taken

The natural starting point in this reporting journey is to conduct a materiality to help you determine the most financially relevant and impactful sustainability matters to disclose. This process involves engaging with stakeholders to identify business priorities.

The following steps can be taken to ensure compliance readiness after the completion of the materiality assessment:

• Streamline data collection: robust sustainability reporting relies upon accurate and accessible data that illustrates transparency across your business operations and entire value chain.
• Align with existing frameworks by conducting an SRS Readiness Assessment: assess where gaps exist between your current reporting outputs and the requirements of UK SRS and other existing frameworks.
• Formalise transition pathways: Articulate a clear strategy for navigating climate-related risks and capitalising on emerging opportunities. This involves establishing science-based milestones and providing evidence-backed updates on your journey toward Net Zero.
• Build Capacity: Bridge any gaps between Finance, Operations, and Sustainability teams through targeted training to ensure metrics are integrated into financial decision-making.
• Audit readiness: Robust internal controls and documented data storage should be established now to ensure a seamless transition to third-party verification.
  
  

Support for PrimeGlobal members

Understanding the myriad requirements of the UK SRS is only the first step; the most significant challenge lies in translating them into meaningful disclosures and measurable actions. Boxfish possesses the regulatory expertise and technical insight necessary to implement these standards with precision. We assist organisations in bridging the gap between compliance and performance, supporting you with:

• Assessing readiness against UK SRS requirements
  
• Carbon footprint assessments to ensure Scope 1, 2 and 3 data is primed for disclosure.
  
• Assistance with materiality assessments.
  
• Climate-related risk and opportunity assessments using climate scenario analysis
  
• Preparation for future assurance and compliance requirements.

Get in touch with Boxfish's UK SRS expert to ensure your organization is ready for the road ahead.