UK SRS S1 materiality

The UK SRS materiality definition

UK SRS S1 paragraph 171 defines sustainability-related financial information as material if "omitting, misstating, or obscuring it could reasonably be expected to influence decisions that primary users of general-purpose financial reports make on the basis of those reports". This mirrors the materiality definition in IFRS S1 paragraph 172.

Three elements of the definition deserve particular attention:

• "Could reasonably be expected to influence" — not whether information will definitely influence decisions, but whether a reasonable possibility exists
• "Primary users" — a specific group (existing and potential investors, lenders, other creditors) defined under UK SRS S1 paragraph 20
• "General-purpose financial reports" — the reports prepared for primary users; not internal management reports or specialised reports for specific stakeholder groups

The definition is judgement-based1. UK SRS S1 paragraph B141 notes that materiality requires judgement, considering both quantitative and qualitative factors, applied across short, medium, and long term horizons.

Primary users — who the disclosure serves

UK SRS S1 paragraph 201 defines primary users as "existing and potential investors, lenders, and other creditors". This is the same primary user definition as IFRS financial reporting under the IFRS Conceptual Framework12.

The implication: UK SRS1 is investor disclosure, not multi-stakeholder reporting. Information serves capital allocation decisions, not employee, community, customer, or NGO concerns. Where broader stakeholder concerns affect investor decisions (e.g. consumer boycott risk, regulatory action arising from public pressure), they become relevant to UK SRS materiality through their effect on entity prospects.

This distinguishes UK SRS1 from EU CSRD5, which serves a broader user base including employees, civil society, supervisory authorities, and consumers. The CSRD broader user base is one reason for the double materiality framework — different users care about different aspects of corporate sustainability.

Three types of materiality

Materiality is not a single concept. Three distinct definitions operate concurrently across UK and international reporting: enterprise value materiality (UK SRS1 and IFRS S12), double materiality (EU CSRD5), and financial statement materiality (IAS 110). Understanding the differences is essential for any entity reporting under multiple regimes — and even for UK-only reporters wrestling with what UK SRS does and does not require.

UK SRS1 uses the enterprise value approach. The sections that follow examine the UK SRS definition in detail, then contrast it with the other two materiality concepts.

Enterprise value materiality — the UK SRS / IFRS S1 approach

Enterprise value materiality12 focuses on whether sustainability information could influence primary user assessments of the entity. The "outside-in" perspective considers how sustainability-related risks and opportunities affect the entity's cash flows, access to finance, cost of capital, or business model over short, medium, and long term horizons.

Material UK SRS topics typically include1:

• Physical climate risks affecting operations, assets, or supply chain
• Transition climate risks (policy changes, technology shifts, market preferences)
• Regulatory developments (emerging mandates, restrictions, costs)
• Stakeholder behaviour shifts (consumer preferences, employee expectations, investor pressure)
• Resource scarcity and operational input availability
• Reputational risks where they materially affect prospects
• Opportunities arising from low-carbon transition (new markets, products, services)

What is NOT typically UK SRS-material1:

• Environmental or social impacts that don't affect entity prospects (e.g. local community impact without commercial consequence)
• Sustainability matters affecting broader stakeholders but not investors
• Aspirational or values-based positioning that has no financial dimension
• Information primarily for marketing or stakeholder engagement purposes

This boundary is one reason UK SRS1 integrates with the broader UK reporting framework rather than replacing it. The Strategic Report under the Companies Act11 contains broader stakeholder information; UK SRS sits within it for investor-facing climate and sustainability disclosure.

Double materiality — the EU CSRD approach

EU CSRD5 uses double materiality. A topic is material if it is financially material OR impact material:

• Financial materiality ("outside-in") — substantially the same concept as UK SRS enterprise value materiality. Effect on entity development, performance, position, cost of capital, or access to finance.
• Impact materiality ("inside-out") — the entity's actual or potential positive or negative impacts on people or the environment over short, medium, and long term horizons.

Either dimension alone can make a topic material under CSRD5. The EFRAG Materiality Assessment Implementation Guidance6 sets out detailed procedures for assessing each dimension separately, then combining the results.

The conceptual difference: under enterprise value materiality, a sustainability matter that harms people or environment but doesn't affect entity prospects is NOT material1. Under double materiality, the same matter IS material because of the impact dimension5.

This is the most consequential difference between UK SRS1 and EU CSRD5 for multi-jurisdictional reporters. The same entity may face different disclosure obligations across the two regimes because materiality assessment produces different topic lists.

Financial statement materiality — the IAS 1 approach

IAS 110 defines financial statement materiality with reference to whether omission or misstatement could influence economic decisions of users based on the financial statements. The IFRS Conceptual Framework12 applies materiality to recognition, measurement, and disclosure in the financial statements.

Three differences from UK SRS materiality1:

• Scope — financial statement materiality applies to the financial statements (balance sheet, P&L, cash flow, notes); UK SRS materiality applies to sustainability-related financial information
• Time horizon — financial statement materiality concerns the reporting period and forward-looking estimates within that period; UK SRS materiality explicitly contemplates short, medium, and long-term horizons that may go beyond financial statement coverage
• Quantitative thresholds — financial statement materiality often uses quantitative thresholds (5% of profit before tax is a common heuristic); UK SRS materiality is fully judgement-based without fixed quantitative thresholds

The connectivity principle in UK SRS S11 requires that sustainability disclosures be connected to information in the financial statements. Material sustainability matters that affect carrying amounts, recognition, measurement, or forward-looking estimates in the financial statements require disclosure of the connection1.

Why the distinction matters in practice

The three-way distinction produces different disclosure obligations in concrete cases. Two examples illustrate.

Example 1 — Emerging regulatory risk

A UK retailer faces emerging regulatory risk from a proposed packaging waste levy expected to take effect in three years. The levy could materially increase product costs.

• Financial statement materiality (IAS 1) — NOT material yet. No recognition or measurement impact in current period; no current-period accounting consequence.
• UK SRS materiality — likely material. The risk could reasonably be expected to influence primary user decisions about long-term prospects, even though it hasn't yet affected the accounts.
• EU CSRD materiality — material under financial dimension (same reasoning as UK SRS).

Example 2 — Environmental impact without financial consequence

A UK manufacturer's operations generate local air pollution affecting nearby residents. The local impact is environmentally significant. The pollution does not currently affect the manufacturer's operations, costs, regulatory standing, or reputation in any material way.

• Financial statement materiality (IAS 1) — NOT material. No accounting consequence.
• UK SRS materiality — NOT material. No effect on entity prospects.
• EU CSRD materiality — material under impact dimension. The inside-out impact triggers disclosure obligation even without financial consequence.

The second example shows the most consequential single difference between UK SRS1 and EU CSRD5. UK SRS reporters do not need to address impact-only matters; EU CSRD reporters do.

The four-step assessment process

UK SRS1 does not prescribe a specific materiality assessment methodology, but does require disclosure of the process used. The IFRS Foundation educational materials4 set out a four-step process that is widely adopted in practice.

Step 1 — Identify

Identify sustainability-related risks and opportunities that could reasonably be expected to affect the entity's prospects1. Sources of input typically include:

• Industry-specific guidance — SASB Standards for the entity's industries, ISSB Industry-based Disclosure Requirements (in IFRS S1 and S2)
• Internal expertise — risk function, strategy, operations, sustainability team perspectives
• Peer practice — what comparable entities are disclosing as material
• Stakeholder input — investor questions, analyst reports, regulatory developments
• External research — scientific, regulatory, market, technology developments

The identification step produces a long list of candidate topics4. The list should be comprehensive rather than pre-filtered — filtering happens in Step 2.

Step 2 — Assess

For each identified topic, assess whether it could reasonably be expected to influence primary user decisions1. UK SRS S1 paragraph B141 requires consideration of:

• Quantitative factors — magnitude of potential financial effect, probability of occurrence
• Qualitative factors — nature of the matter, time horizon, relationship to entity strategy and operations
• Short, medium, long term implications — matters that might not affect current accounts but could affect long-term prospects
• Entity-specific factors — circumstances that differ from industry baseline

The assessment step produces a material/not-material decision for each topic4. The threshold is judgement-based — could the information reasonably be expected to influence primary user decisions?

Step 3 — Prioritise

Among material topics, prioritise based on significance to primary users and reporting cost-benefit4. UK SRS S11 does not require equal treatment of all material topics — entities can devote more disclosure detail to more significant matters.

Prioritisation factors typically include:

• Magnitude of potential effect on prospects
• Probability of materialisation
• Time horizon of effect
• Interconnection with other material topics
• Connection to financial statements (connectivity principle)
• User interest signals (analyst questions, investor engagement themes)

Step 4 — Disclose

Make required disclosures for material topics1. UK SRS S1 paragraphs B19-B221 additionally require disclosure of the materiality assessment process itself — the methodology used, sources of input, judgements made, and significant changes from prior period.

The process disclosure protects the entity in two directions1:

• Under-disclosure risk — if a regulator or assurance provider questions whether a topic should have been included, the entity can point to the documented assessment process
• Over-disclosure risk — if an entity faces criticism for including matters that don't meet the materiality threshold, the documented process shows the reasoning

Short, medium, and long term

UK SRS S1 paragraph B151 requires materiality assessment across short, medium, and long term horizons. The standard does not prescribe specific time periods — entities define their own horizons reflecting industry, business model, and planning cycle.

Typical practice4:

• Short term — 1 year (alignment with annual reporting cycle)
• Medium term — 1-5 years (alignment with strategic planning cycle)
• Long term — 5+ years (longer horizons for matters such as climate physical risk, asset retirement, fundamental transition)

The horizon distinction is consequential for matters such as climate transition risk. A regulatory restriction that takes effect in 8 years may not affect current-period financial statements but could materially affect long-term prospects — and is therefore UK SRS-material1 in the current reporting period.

Connectivity with financial statements

UK SRS S11 requires sustainability disclosures to be connected to financial statements. Where material sustainability matters affect items in the financial statements — carrying amounts, recognition, measurement, forward-looking estimates — the connection must be explained.

The connectivity principle has materiality implications1:

• Material sustainability matters that affect financial statement items must be disclosed in connection with those items
• Assumptions used in sustainability disclosures must be consistent with assumptions used in financial statements (e.g. carbon prices, discount rates, transition assumptions)
• Where assumptions differ between the two, the difference must be explained
• Forward-looking estimates in financial statements should reflect identified material sustainability risks where relevant (e.g. impairment testing reflecting climate transition risk)

Industry vs entity-specific factors

UK SRS S1 paragraph B181 recognises that materiality varies by industry. SASB Standards9 and ISSB Industry-based Disclosure Requirements provide industry-level baselines for likely-material topics.

However, entity-specific factors can shift materiality away from industry baseline1:

• Geographic concentration affecting physical climate exposure
• Customer concentration affecting transition risk
• Supply chain structure affecting Scope 3 emissions or labour-related risk
• Business model differentiation affecting how sustainability matters translate to prospects
• Strategic positioning (e.g. net-zero leader vs follower) affecting transition risk profile

Where entity-specific factors differ materially from industry baseline, the entity discloses the difference and the rationale1.

The role of SASB Standards

SASB Standards9 (now maintained by the IFRS Foundation) provide industry-specific sustainability metrics and topic lists. They are referenced extensively in UK SRS1 for industry-based metric identification.

UK SRS1 softened the IFRS S12 language on SASB Standards. Most references say "may refer to" SASB Standards rather than "shall refer to". Two exceptions retain the binding language: paragraph 37 (climate metrics) and paragraph B65(d) (financial institution financed emissions industry metrics).

For materiality assessment specifically, SASB Standards9 provide a starting point — industry-level lists of likely-material topics that the entity can use to inform Step 1 (identify). Use of SASB Standards is not mandatory under UK SRS1 for non-climate disclosure, but they remain the most widely cited industry-specific reference in UK practice.

For dual UK SRS + CSRD reporters

Entities in scope of both UK SRS1 and EU CSRD5 typically run a single double materiality assessment for CSRD and extract the enterprise-value-material subset for UK SRS. This is operationally efficient — the financial dimension of double materiality is conceptually equivalent to enterprise value materiality.

The EFRAG-IFRS Foundation Interoperability Guidance7 published in May 2024 provides operational guidance for managing the dual regime. The guidance is not a materiality alignment — it maps disclosure overlaps to reduce duplicative reporting work, but does not change the underlying materiality definitions.

Practical approach for dual reporters:

• Conduct double materiality assessment for CSRD purposes per EFRAG guidance
• Identify the subset of topics that are financially material (substantially equivalent to UK SRS enterprise value materiality)
• Apply UK SRS disclosure requirements to the financially material subset
• Apply EU CSRD disclosure requirements to all material topics (financial + impact)
• Document the materiality assessment process for both regimes — disclosure under UK SRS S1 paragraphs B19-B22 requires this

Documentation and disclosure of judgements

UK SRS S1 paragraphs B19-B221 require disclosure of:

• The process used to identify sustainability-related risks and opportunities
• The process used to determine which information about those risks and opportunities to disclose
• Significant judgements made in applying the materiality threshold
• Any significant changes in the process from the prior reporting period

These process disclosures sit within the body of UK SRS disclosures1 rather than in a separate methodology section. They are typically organised within the Strategy pillar disclosure, alongside the topic-level material disclosures themselves.

Documentation should be contemporaneous and defensible. ISSA (UK) 50008 assurance practitioners examining UK SRS disclosures will evaluate the materiality assessment process — the documentation is the evidence base for that examination.