Is Double Materiality Required Under IFRS Sustainability Standards?

No. Double materiality is not required under IFRS Sustainability Disclosure Standards. IFRS S1 and IFRS S2 use a single, investor-centric materiality concept focused exclusively on how sustainability-related risks and opportunities affect enterprise value. If your company reports only under the ISSB standards, you have no obligation to assess your impacts on people, communities, or the environment unless those impacts feed back into your financial prospects.

This distinction matters enormously in practice. Many ESG teams trained on GRI or ESRS double materiality assume the IFRS framework demands the same broad stakeholder lens. It does not. Getting this wrong means either over-engineering a materiality process you do not need, or under-engineering one that leaves your financial materiality assessment incomplete.

This article is for CFOs, ESG controllers, and sustainability reporting leads at companies navigating IFRS S1/S2 adoption, CSRD compliance, or both. It gives you the precise regulatory answer, the paragraph-level citations you need for board papers and audit committee memos, and a practical guide to avoiding duplicate work if you operate across both regimes.

Key takeaway: IFRS S1 paragraph 18 is the operative materiality definition. It asks one question: could omitting, misstating, or obscuring this information reasonably influence the decisions of primary users (investors, lenders, creditors) assessing enterprise value? That is financial materiality, not double materiality.

What Does IFRS S1 Actually Require on Materiality?

IFRS S1 defines materiality consistently with IFRS Accounting Standards. IFRS S1 paragraph 18 states that information about sustainability-related risks and opportunities is 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.

Paragraph B14 of IFRS S1 defines those primary users precisely: they are existing and potential investors, lenders, and other creditors making decisions about buying, selling, or holding equity and debt instruments; providing or selling loans and other forms of credit; or exercising rights to vote on management's actions affecting economic resources. That is a deliberately narrow group, anchored to capital market participants, not the broader stakeholder universe that double materiality encompasses.

Two practical rules flow from this:

• An entity need not disclose immaterial information even if an IFRS Sustainability Disclosure Standard technically requires it. Materiality is a filter, not a floor.
• An entity must not obscure material information. Burying a material risk in boilerplate language fails the standard just as much as omitting it.

The IFRS Foundation's materiality education material confirms this framing: "Materiality is used to assess whether information required by ISSB Standards would need to be disclosed by a particular entity." The assessment is entity-specific and judgment-based, with no preset quantitative thresholds.

For climate specifically, IFRS S2 paragraph 4 explicitly scopes out climate-related risks and opportunities that "could not reasonably be expected to affect an entity's prospects." In practice, KPMG notes that given the pervasive financial impact of climate risk, most organisations will provide the full suite of IFRS S2 disclosures. But the materiality gate still exists.

What Is Double Materiality, and Where Is It Required?

Double materiality is mandated under the EU's Corporate Sustainability Reporting Directive (CSRD) via the European Sustainability Reporting Standards (ESRS). It is not an ISSB concept.

Under ESRS 1, double materiality has two sub-dimensions:

1. Impact materiality (inside-out): the company's actual or potential positive or negative impacts on people and the environment, assessed across scale, scope, irremediable character, and likelihood. This dimension asks: what harm or benefit does our business cause?
2. Financial materiality (outside-in): sustainability-related risks and opportunities that could affect the company's financial performance, position, cash flows, access to finance, or cost of capital. This dimension asks: what do sustainability factors do to us financially?

Critically, under ESRS a topic is material if it meets either criterion. A company with significant community impacts that do not (yet) affect enterprise value must still disclose them under ESRS. That is the structural difference from IFRS S1/S2, which only requires disclosure when the financial materiality test is met.

As the IFRS Foundation's March 2023 Global Preparers Forum update put it directly: "ESRS uses the concept of 'double materiality,' which means a disclosure is material if it is material from an 'impact' perspective [or a financial perspective]. [By contrast,] the IFRS Sustainability Standards prioritize the information needs of primary users, particularly investors, lenders, and other creditors."

ESRS 1 paragraphs 44 and 45 define two distinct stakeholder categories for double materiality purposes: affected stakeholders (workers, communities, the environment) and users of sustainability reporting (investors, lenders, creditors). IFRS S1 only addresses the second group. That structural difference means a full ESRS double materiality assessment requires engagement with a fundamentally broader stakeholder universe than IFRS S1/S2 demands.

How the Three Major Frameworks Compare on Materiality

Practitioners often encounter GRI, IFRS S1/S2, and ESRS simultaneously. The table below maps the materiality concept across all three.

Note the symmetry: GRI is the mirror image of IFRS S1/S2. GRI captures only the inside-out impact dimension; IFRS S1/S2 captures only the outside-in financial dimension. ESRS double materiality combines both. A company reporting under all three frameworks is, in effect, covering the full picture, but it needs three distinct materiality lenses to do so correctly.

Which Companies Are Subject to IFRS S1/S2 vs. ESRS/CSRD?

The regime that governs your materiality assessment depends on where you are incorporated and where you operate.

As of mid-2026, over 30 jurisdictions have adopted, are in the process of adopting, or are consulting on IFRS S1 and IFRS S2, following IOSCO's July 2023 endorsement. These include Australia (AASB S2), Singapore (SGX), the United Kingdom (UK SRS), and Canada (CSDS 1 and 2). In these jurisdictions, financial materiality governs.

The CSRD/ESRS double materiality regime applies to:

• Large EU undertakings meeting two of three thresholds (500+ employees, EUR 50m+ net turnover, EUR 25m+ balance sheet)
• Non-EU companies with net turnover exceeding EUR 150m in the EU and at least one large EU subsidiary or branch

Many multinationals fall into both camps: an Australian-listed company with a large EU subsidiary may need to satisfy IFRS S1/S2 (financial materiality) for its primary listing and CSRD/ESRS (double materiality) for its EU reporting obligations simultaneously.

The ISSB's design philosophy is explicit about this layering. IFRS S1/S2 is intended as a "global baseline" that jurisdictions can build upon. The EU has done exactly that by adding double materiality on top. IFRS S1/S2 compliance is necessary but not sufficient for CSRD/ESRS compliance, and the reverse is also true: completing a CSRD double materiality assessment does not automatically satisfy the IFRS S1/S2 financial materiality assessment.

If You Already Did a CSRD Double Materiality Assessment, Can You Use It for IFRS S1/S2?

Partially yes, with important caveats. This is the most practical question for companies operating across both regimes, and it is almost entirely absent from the existing guidance landscape.

KPMG's 2025 materiality how-to guide addresses it directly: "Although not required by IFRS Sustainability Disclosure Standards, [an entity] considers that [a] DMA [double materiality assessment under ESRS] is reasonable [as a starting point for the IFRS S1/S2 financial materiality assessment]."

The key word is "starting point." A CSRD double materiality assessment (DMA) must be reviewed and adjusted before it can serve IFRS S1/S2 purposes, for three reasons:

1. Stakeholder scope differs. The ESRS DMA engages affected stakeholders (workers, communities, environment) whose perspectives are irrelevant to IFRS S1/S2 unless they create financial risks. The IFRS S1/S2 assessment must be anchored to primary users' enterprise value judgments.
2. The financial materiality concepts are similar but not identical. The EFRAG/ISSB reconciliation tables confirm that ESRS financial materiality and IFRS S1 materiality are conceptually aligned but differ in time horizon treatment and stakeholder framing in some respects.
3. ESRS presumes materiality for mandatory disclosure requirements. ESRS 1 states that all mandatory disclosure requirements established by ESRS shall be presumed to be material. IFRS S1/S2 has no such presumption; every disclosure is subject to the entity-specific materiality filter.

The practical workflow for a dual-regime company:

1. Complete the full ESRS four-step DMA (identify business activities and value chain; identify impacts, risks, and opportunities (IROs); determine which IROs are material; conclude and document) as required by Deloitte's CSRD/ESRS guidance.
2. Extract the financial materiality findings from the DMA (the outside-in risks and opportunities).
3. Review those findings against the IFRS S1 paragraph 18 test: would omitting this information influence a primary user's enterprise value assessment?
4. Supplement where the ESRS financial materiality lens differs from the IFRS S1/S2 investor-centric lens.
5. Document the IFRS S1/S2 materiality conclusion separately, citing the specific IFRS S1 paragraphs (18, B14) in your board and audit committee papers.

The EFRAG/ISSB interoperability reconciliation table (Appendix 5) spans 73 pages of paragraph-by-paragraph mapping between ESRS 1, ESRS 2, ESRS E1, IFRS S1, and IFRS S2. It is the most comprehensive tool available for identifying where the two regimes overlap and where they diverge.

The "Dynamic Materiality" Consideration

One question that practitioners increasingly raise: should a company voluntarily apply double materiality even when only IFRS S1/S2 is required?

There is a credible case for it. Impact materiality today can become financial materiality tomorrow as regulatory, reputational, or physical risks crystallize. A company that dismisses its Scope 3 emissions as immaterial to enterprise value today may find that regulatory carbon pricing, supply chain disruption, or investor pressure makes them financially material within a three-to-five year horizon. The ISSB's own post-S1/S2 research agenda, which includes biodiversity, human capital, and human rights, reflects exactly this dynamic: topics where the inside-out impact lens is most relevant are precisely the ones where the financial materiality line is most likely to shift.

No formal ISSB proposal to adopt double materiality exists as of mid-2026. But companies with sophisticated ESG programs and significant EU exposure often find that running a full double materiality assessment, even where IFRS S1/S2 alone applies, produces better strategic insight and reduces the risk of being caught flat-footed when the financial materiality line moves.

Assurance Implications

The materiality framework you apply has direct consequences for your assurance provider. Under ESRS, the double materiality assessment itself is subject to assurance, and EFRAG's assurance standards address the DMA process specifically. Under IFRS S1/S2, assurance providers apply standards aligned with the financial materiality concept, and the materiality assessment process is more principles-based, with no prescribed four-step procedure.

Audit committees briefing assurance providers should be explicit about which framework governs and which materiality standard applies. Mixing up the two in an assurance engagement scope creates gaps that regulators and auditors will find.

FAQ

Is IFRS single or double materiality? IFRS Sustainability Disclosure Standards (IFRS S1 and S2) use single, financial materiality only. Information is material if omitting or obscuring it could influence primary users' enterprise value assessments. The ISSB does not require assessment of a company's impacts on people or the environment unless those impacts affect enterprise value.

Is double materiality mandatory? Double materiality is mandatory under the EU's CSRD via the European Sustainability Reporting Standards (ESRS). It is not required under IFRS S1/S2. As of mid-2026, no other major jurisdiction outside the EU has mandated double materiality, though GRI standards, which are widely used voluntarily, apply impact materiality (the inside-out dimension only).

What is the definition of materiality under IFRS Sustainability Disclosure Standards? IFRS S1 paragraph 18 defines it: information is 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. Primary users are investors, lenders, and other creditors, as defined in IFRS S1 paragraph B14.

Can a company voluntarily apply double materiality under IFRS S1/S2? Yes. Nothing in IFRS S1/S2 prohibits voluntary disclosure of impact materiality information. Companies may choose to disclose broader sustainability impacts for strategic, reputational, or investor relations reasons. The ISSB's building-block architecture is designed to allow jurisdictions and companies to layer additional disclosures on top of the IFRS baseline.

What is the EFRAG/ISSB interoperability tool and should we use it? The EFRAG/ISSB reconciliation table (Appendix 5) maps ESRS 1, ESRS 2, and ESRS E1 against IFRS S1 and IFRS S2 at paragraph level across 73 pages. Companies subject to both CSRD and IFRS S1/S2 should use it to identify where a single disclosure satisfies both regimes and where separate work is needed. It is the most authoritative tool for avoiding duplication.

Does completing a CSRD double materiality assessment satisfy IFRS S1/S2? Not automatically. The financial materiality findings from a CSRD DMA can serve as a starting point for the IFRS S1/S2 assessment, but the two must be reviewed against each other. Key differences in stakeholder scope, presumed materiality under ESRS, and time horizon treatment mean a direct substitution is not appropriate without a documented reconciliation step.

For a full breakdown of what IFRS S1 and S2 require across all four disclosure pillars, governance, strategy, risk management, and metrics and targets, see IFRS S1 and S2 Disclosure Requirements: The Complete 2026 Guide.