IFRS.Report
Materiality in IFRS — Single vs Double
A practical map of IFRS financial materiality, ESRS double materiality, and the evidence trail auditors expect.
The company scored 98 out of 100 on its ESG rating. Its workers were striking over heatstroke conditions on the factory floor. Both facts were true at the same time.
That contradiction exists because ESG ratings measure what companies choose to disclose. Materiality — the concept at the heart of every sustainability standard — determines what must be disclosed. But materiality means different things to different frameworks. Under IFRS S1 §17–19, information is material if omitting, misstating, or obscuring it could reasonably influence the decisions of investors. This is financial materiality: what affects enterprise value. Under the EU's ESRS, materiality is double: it includes both financial materiality and impact materiality — how the company affects the world, not just how the world affects the company.
The distinction matters. A mining company operating in a water-scarce region has material water risks under both frameworks — financially, because water scarcity threatens operations; in terms of impact, because the company's water use affects the local community. But a company's contribution to global biodiversity loss might be material under ESRS (impact) and not material under IFRS S1 (financial). The ISSB and EFRAG published joint interoperability guidance in May 2024 confirming that companies can report under both frameworks without duplication. The key is documentation: every materiality judgment must be recorded, justified, and defensible to an auditor. The 98-out-of-100 rating and the heatstroke strikes are both real. Materiality determines which one gets disclosed.
Materiality is the filter that separates what must be disclosed from what can be omitted — and its definition determines whether a 98/100 ESG rating is meaningful or misleading.
In Plain Language
Materiality determines what must be disclosed. IFRS S1 §17–19 defines materiality as information that could reasonably influence investor decisions. Unlike financial accounting materiality, sustainability materiality considers both the likelihood and the magnitude of impacts across the full value chain. These four requirements explain how to apply the materiality judgment and document the reasoning.
- Materiality is the filter that separates what must be disclosed from what can be omitted — and its definition determines whether a 98/100 ESG rating is meaningful or misleading.
- IFRS S1 §17–19 defines materiality through the lens of investor decision-usefulness; ESRS adds impact materiality — the two frameworks are different but interoperable under ISSB-EFRAG guidance.
- The practical test is whether an auditor can review every materiality judgment and trace it back to the specific IFRS or ESRS paragraph that authorizes the determination.
Technical Requirements
- Investor decision-usefulness — IFRS S1 §17–19: Information is material if omitting, misstating, or obscuring it could reasonably influence the decisions of primary users of general-purpose financial reports.
- Entity-specific judgment — IFRS S1 §17–19: Materiality is entity-specific — the same information may be material for one company and not for another, based on the nature and magnitude of the item in context.
- Double materiality bridge — May 2024 ISSB-EFRAG guidance: Financial materiality (IFRS) and impact materiality (ESRS) overlap where the same sustainability topics affect both enterprise value and stakeholders.
- Audit documentation — ISAE 3000: Companies must document their materiality judgments — the criteria used, the thresholds applied, and the rationale for inclusion or exclusion — so that an assurance provider can review them.