Materiality is the idea at the centre of credible sustainability reporting. It decides which sustainability matters are significant enough to influence an organisation's reporting, decisions and management attention. This article explains the core materiality concepts in ESG: what materiality means, how impact materiality and financial materiality differ, what double materiality adds, how GRI and ESRS treat the question differently, and what the 2026 wave of standard changes means in practice.

Materiality has moved a long way from a stakeholder survey plotted on a chart. Traditionally, organisations asked stakeholders which environmental, social and governance issues mattered most and presented the result as a materiality matrix ranking topics like climate change, water, human rights and business ethics. That approach still has a place, but modern reporting expects a more rigorous view of impacts, risks and opportunities across the value chain.

Two reference points frame everything that follows. Under the GRI Standards, materiality is about an organisation's most significant impacts on the economy, environment and people, including human rights, with GRI 3: Material Topics 2021 as the benchmark. Under the European Sustainability Reporting Standards (ESRS), the concept is broader: double materiality combines impact materiality (how the organisation affects people and the environment) with financial materiality (how sustainability matters create risks and opportunities for the organisation). A matter can be material from either perspective, or both.

What Does Materiality Mean in ESG?

A sustainability matter may be material because:

• the organisation has a significant impact on people or the environment;
• the organisation faces significant sustainability-related risks or opportunities;
• stakeholders are significantly affected by the issue;
• the issue could influence strategy, financial performance or access to capital;
• the issue has implications across the value chain; or
• a reporting framework requires it to be considered.

So materiality determination is not "which ESG topics are popular?" The real question is: which sustainability matters are significant enough to affect the organisation's impacts, decisions, strategy, risk profile or reporting? The answer depends on the framework you apply.

Why Materiality Concepts Matter in ESG Reporting

Getting materiality right is what separates a defensible sustainability report from a marketing document. It focuses scarce effort on the topics that matter, keeps disclosure proportionate, and gives assurance providers, investors and regulators a rationale they can test. Get it wrong, and you either over-report on trivial topics or miss the ones that carry real risk and impact, both of which undermine trust.

Materiality also drives comparability. When organisations in the same sector apply a consistent concept of materiality, their disclosures can be compared. That is precisely why the standard setters have worked to define materiality so carefully, and why understanding the differences between them matters.

Materiality Issues: The Usual ESG Topics

Materiality issues are the candidate topics an assessment considers before deciding which are material. They are commonly grouped under the three ESG pillars.

Environmental issues

Climate change (mitigation and adaptation), energy, water and effluents, biodiversity and ecosystems, pollution, resource use and the circular economy, and waste.

Social issues

Own workforce (health and safety, working conditions, fair pay), workers in the value chain, affected communities, human rights, diversity and inclusion, and consumer or product responsibility.

Governance issues

Business conduct and ethics, anti-corruption and anti-bribery, board governance, risk management, data privacy and cybersecurity, and responsible procurement.

A topic on this list is only "material" once an assessment shows it is significant from an impact or financial perspective. The list is the starting point, not the conclusion.

How Materiality Evolved: From Single to Double Materiality

Early materiality practice was single: one lens, usually either the organisation's impacts (the GRI tradition) or the financial effect of ESG issues (the investor tradition). The two communities talked past each other for years.

Double materiality resolved that by insisting on both lenses at once. It became the defining feature of the ESRS and is now the reference concept internationally, even in jurisdictions that do not use the ESRS themselves. The shift matters because a topic can be highly material to your impact on the world while being financially modest, or the reverse. Looking through only one lens hides half the picture.

Impact Materiality: The Inside-Out Perspective

This is the heart of the GRI approach. Under GRI 3, an organisation identifies its actual and potential impacts, then prioritises them by significance, judged on the severity of the impact (its scale, scope and how hard it is to remediate) and, for potential impacts, their likelihood. Severe negative human-rights impacts take priority regardless of likelihood.

Impact materiality is where sustainability reporting connects to the real world: emissions, water stress, labour conditions, community effects. It does not ask whether an impact costs the company money. It asks whether the impact is significant in itself.

Financial Materiality: The Outside-In Perspective

This is the ISSB approach. IFRS S1 (general requirements) and IFRS S2 (climate), issued by the International Sustainability Standards Board in June 2023 and effective for annual periods from 1 January 2024, are built around this investor-focused, enterprise-value lens. The question is not whether the organisation affects the world, but whether a sustainability matter could move the numbers investors care about.

Financial materiality is dynamic. A topic that is financially immaterial today (say, a water constraint that is currently manageable) can become material as conditions, regulation or markets change.

What Is Double Materiality?

Perspective 1: Impact materiality

How the organisation affects people and the environment (inside-out).

Perspective 2: Financial materiality

How sustainability matters create risks and opportunities for the organisation (outside-in).

The power of double materiality is that it refuses to let either perspective hide the other. A high-impact, low-financial topic still earns a place. So does a low-impact, high-financial one. This is why the ESRS made double materiality its foundation, and why investors and regulators worldwide increasingly expect it, even outside the EU.

Single vs Double Materiality

A single-materiality approach applies one primary lens. A financial-only view (the traditional investor stance, and the ISSB's focus) considers how ESG issues affect the business. An impact-only view (the GRI tradition) considers how the business affects the world.

Double materiality applies both, and treats a matter as material if it clears either threshold. In practice, a GRI-based impact assessment and an ISSB-based financial assessment each deliver one half of a double materiality assessment. That is not a coincidence; it is why organisations can build toward double materiality using the framework they already know.

A GRI impact assessment and an ISSB (IFRS S1 and S2) financial assessment together deliver what the ESRS asks for in a single exercise. Building on the framework you already use is rarely wasted work.

How a Materiality Assessment Works in Practice

Understanding the concept is one thing; running the exercise is another. A robust assessment moves through a clear sequence, each step producing evidence that the next one builds on.

Step 1: Understand the organisation and its context

Map the business model, activities, value chain, sector and the reporting framework that applies. Materiality is context-specific; the same topic is material for one company and not another.

Step 2: Identify sustainability matters

Build a candidate list from the standards, sector benchmarks, peer reporting and the value chain, not from a generic ESG checklist.

Step 3: Assess impact materiality

Identify actual and potential impacts and score their significance (severity and, for potential impacts, likelihood). This is the inside-out analysis.

Step 4: Assess financial materiality

Identify the sustainability-related risks and opportunities that could affect the business, and assess their potential magnitude and likelihood. This is the outside-in analysis.

Step 5: Determine material impacts, risks and opportunities

Bring both perspectives together, apply thresholds, and document the material impacts, risks and opportunities (IROs), with the reasoning recorded so the conclusion is defensible under assurance.

A step often missed: leadership and board validation. Because the survey and scoring cannot see everything, senior review from a business-risk perspective, testing the result against policy, practice and performance, is what turns a survey output into a decision the organisation can stand behind.

Is a Materiality Matrix Still Relevant?

The risk with a matrix is that it invites shortcuts: plotting stakeholder opinion on two axes and calling it done. A matrix is only as credible as the assessment behind it. Used well, it summarises a rigorous process. Used badly, it disguises the absence of one. The 2026 direction of travel, discussed below, is explicitly away from matrix-as-assessment and toward a documented, strategy-led analysis.

A Simple Double Materiality Example

What Has Changed in the ESG Materiality Landscape in 2026?

ISSB adoption goes global. The ISSB standards (IFRS S1 and S2) are becoming the global baseline for investor-focused, financial-materiality disclosure. By April 2026, around 28 jurisdictions had adopted them on a voluntary or mandatory basis, with dozens more in progress, together representing roughly 60 per cent of global GDP. Rules mandating ISSB-aligned reporting took effect at the start of 2026 in jurisdictions including Chile, Qatar and Mexico. The ISSB has also signalled that nature-related requirements will follow, expected late 2026.

India. SEBI's Business Responsibility and Sustainability Reporting (BRSR) framework continues to embed materiality as a mandatory element, with BRSR Core assurance phasing in across the top listed companies. For Indian organisations, materiality is not a European nicety; it is a domestic compliance requirement. See brsr reporting for the India-specific picture.

The through-line: materiality is being simplified in process but reinforced in principle. Double materiality is not going away; it is maturing.

Common Mistakes in Materiality Determination

1. Treating stakeholder voting as the assessment. Stakeholder input is evidence, not the answer. Significance is judged on severity and likelihood, not on how many people ticked a box.
2. Starting with a generic ESG checklist. Material topics come from your business, sector and value chain, not from a universal list.
3. Confusing stakeholder importance with impact materiality. What stakeholders care about and what is genuinely significant are related but not the same.
4. Ignoring the value chain. Many of the most severe impacts and risks sit upstream or downstream, not in your own operations.
5. Treating financial materiality as conventional financial-reporting materiality. They are different concepts over different time horizons.
6. Assuming every topic must be material from both perspectives. Many topics are material on one axis only. That is the point of double materiality.
7. Treating the materiality matrix as the assessment itself. The matrix presents the result; it is not the analysis.
8. Making materiality a one-time exercise. Reassess when your business, impacts, risks or the external environment change materially.

From Topics to IROs: Materiality and ESG Reporting

Modern materiality is not about ranking ESG topics on a chart. A robust approach flows from context to stakeholders to activities and value chain, to actual and potential impacts, to impact significance, to sustainability risks and opportunities, to financial effects, to material impacts, risks and opportunities (IROs), and finally to the relevant reporting and management response.

For organisations using GRI, the central question stays: what are our most significant impacts on the economy, environment and people? For those working with ESRS and double materiality, it expands: what are our material impacts, and what sustainability-related risks and opportunities could materially affect the organisation? Understanding that distinction is the foundation of credible ESG reporting, sustainability reporting, brsr reporting and the evolving disclosure landscape.

Frequently Asked Questions

What are materiality concepts in ESG?

Materiality concepts in ESG are the principles used to decide which sustainability matters are significant enough to manage and report. The main concepts are impact materiality (the organisation's effect on people and the environment), financial materiality (the effect of sustainability matters on the organisation), and double materiality (both together).

What is double materiality?

Double materiality combines impact materiality and financial materiality. It asks both how an organisation affects people and the environment and how sustainability matters can affect the organisation financially. A matter can be material from either perspective, or both. It is the foundation of the ESRS.

What is impact materiality?

Impact materiality focuses on an organisation's actual and potential, positive and negative impacts on people and the environment. GRI's approach is fundamentally impact-oriented, judging significance by severity and, for potential impacts, likelihood.

What is financial materiality?

Financial materiality examines sustainability-related risks and opportunities that could reasonably affect an organisation's financial position, performance, cash flows, access to finance or cost of capital over relevant time horizons. It is the ISSB (IFRS S1 and S2) lens.

What is the difference between single and double materiality?

Single materiality applies one lens, usually either impact or financial. Double materiality applies both, treating a matter as material if it is significant from either perspective. Inside-out impact plus outside-in financial equals double materiality.

Is a materiality matrix the same as a materiality assessment?

No. A materiality matrix is a visual summary of prioritised topics. A full assessment identifies impacts, risks and opportunities, sets criteria, gathers evidence, applies thresholds and documents the rationale. The matrix presents the result; it is not the analysis.

Does GRI use double materiality?

GRI's concept is focused on an organisation's most significant impacts on the economy, environment and people, including human rights. This differs from the ESRS concept of double materiality, which explicitly combines impact and financial materiality. A GRI impact assessment can, however, form the impact half of a double materiality assessment.

How often should a materiality assessment be conducted?

It should not be a fixed annual survey by default. Monitor significant changes in your activities, business relationships, impacts, risks, opportunities, methodology and external environment, and update the assessment when those changes could affect its conclusions.