The plain-English explainer

Double materiality and the double materiality assessment

Double materiality is the principle at the heart of CSRD: a sustainability topic matters if it is significant for people and the planet (impact) or for your business (financial), or both. The double materiality assessment (DMA) is how you work that out, and it decides exactly which ESRS disclosures you must make. EFRAG IG 1

TL;DR

  • Two lenses: impact materiality (inside-out) and financial materiality (outside-in).
  • Either is enough: a topic is material if it crosses the threshold on impact OR financial grounds.
  • The output: a documented, IRO-based list of material topics that scopes your ESRS report.
  • The matrix is optional: ESRS requires the assessment, not a 2x2 chart.
  • Post-Omnibus: double materiality survives; EFRAG now encourages a lighter top-down approach.
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What double materiality means

Double materiality is a way of deciding what counts as material for sustainability reporting by combining two perspectives. Impact materiality looks outward from the company (inside-out): how your business affects people and the environment. Financial materiality looks inward (outside-in): how sustainability matters affect your financial position, performance and cash flows. Under CSRD, a topic is material if it is significant under either lens. EFRAG IG 1

This is what makes CSRD distinctive. Investor-focused frameworks such as the ISSB standards use only financial materiality. CSRD, via the ESRS, requires both, so a company must report a topic such as its pollution even when that pollution does not yet hit its profit and loss. The concept is set out in ESRS 1, the cross-cutting standard that defines how reporting works. ESRS 1, Delegated Reg. (EU) 2023/2772

Impact materiality (inside-out)

How your own operations and value chain affect people and the environment, positive or negative, actual or potential. Scored on scale, scope and irremediability (plus likelihood for potential impacts). This lens does not depend on any financial effect.

Financial materiality (outside-in)

How a sustainability matter creates risks or opportunities that affect your cash flows, financial position, performance, cost of capital or access to finance. Scored on the magnitude of the financial effect times its likelihood, over short, medium and long horizons.

The double materiality assessment, step by step

The double materiality assessment (DMA) is the mandatory first step of CSRD reporting: it determines which ESRS topics and datapoints you must disclose. EFRAG Implementation Guidance 1 sets out a structured method. The eight steps below reflect how companies actually run it in practice. EFRAG IG 1

  1. 1

    Understand context and value chain

    Map your business model, activities, geographies and the upstream and downstream value chain. Use the ESRS AR 16 topic list as a starting point to draw up a long-list of candidate sustainability matters.

  2. 2

    Engage stakeholders

    Identify and map stakeholders (employees, investors, customers, suppliers, communities, NGOs, regulators) plus the silent stakeholders, nature and future generations. Gather input via surveys, interviews and workshops.

  3. 3

    Identify IROs

    Translate each candidate matter into concrete Impacts, Risks and Opportunities. Distinguish actual from potential, positive from negative, and locate each in your own operations or the value chain.

  4. 4

    Score impact materiality

    Rate each impact on scale, scope and irremediability (and likelihood for potential impacts), typically on a 1 to 5 scale.

  5. 5

    Score financial materiality

    Rate each risk or opportunity on magnitude of financial effect times likelihood, across short, medium and long-term horizons.

  6. 6

    Set thresholds

    Define the cut-off score above which an IRO is material. Inform thresholds with quantitative data where possible and document them for the auditor.

  7. 7

    Aggregate and determine material topics

    Roll IRO scores up to topic level. A topic is material if any associated IRO exceeds the threshold on either the impact or financial dimension.

  8. 8

    Validate and visualise

    Validate with management, board and stakeholders. Output a list of material topics (and optionally a materiality matrix). This drives your disclosure scope.

The 2026 top-down approach

EFRAG's revised guidance endorses a top-down method: conclude materiality at topic level first, using strategy and sector context, then drill into IRO-level scoring only for the topics that pass the initial filter. For most companies this is far less work than scoring every IRO from scratch. EFRAG IG 1

The materiality matrix (and why it is optional)

A materiality matrix is the visual output of the assessment: a chart that plots sustainability topics so readers can see priorities at a glance. Under double materiality, one axis is impact materiality and the other is financial materiality. Topics in the top-right quadrant score high on both, but a topic is material, and must be reported, if it is significant on either axis alone.

ESRS does not require a matrix. The required output is a documented, IRO-based assessment and a list of material topics. Because a 2x2 grid can wrongly imply that a topic in the bottom-left is not material when it actually crosses a single-axis threshold, many companies now present ranked tables or heat maps instead. Use the matrix as an explanatory aid, not the conclusion.

Want to produce one quickly? Use the materiality matrix builder to plot your scored IROs on impact and financial axes and export the result.

Double materiality vs single materiality

Single materiality asks one question: does a sustainability matter affect enterprise value? It is the lens used by the ISSB (IFRS S1 and S2) and other investor-focused frameworks. Double materiality adds the impact lens on top, so a topic can be material because of its effect on people or the planet even if it has no near-term financial effect. CSRD is the major regime that requires both.

In practice this means a CSRD double materiality assessment can satisfy much of an ISSB or GRI assessment, because it spans both lenses. See how the frameworks compare and interoperate on our frameworks comparison page.

The standards are being revised

The Omnibus I Directive (Directive (EU) 2026/470) and the revised ESRS cut mandatory datapoints by more than 60 percent and simplify guidance. The European Commission published a draft revised ESRS for consultation on 6 May 2026, with a final delegated act expected around mid to late 2026, applicable from FY2027 (optional early use FY2026). Double materiality survives, but the detail of what you disclose for a material topic is changing. We track every change in The CSRD Brief. European Commission

By the numbers

Double materiality in figures

2

Lenses: impact materiality (inside-out) and financial materiality (outside-in).

Either

A topic is material if it crosses the threshold on either lens, not both.

8

Practical steps in a DMA, from value-chain mapping to a validated topic list.

Optional

The materiality matrix: a presentation aid, not an ESRS requirement.

Get the DMA workbook

A free Excel double materiality workbook: a topic long-list, an IRO scoring sheet for impact and financial materiality, threshold logic and an auto-generated material-topic list. Score your topics in the matrix builder, then download the workbook instantly with your email and stay posted as the ESRS revision lands.

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FAQ

People also ask

What is a double materiality assessment?

A double materiality assessment (DMA) is the structured process CSRD reporters use to decide which sustainability topics they must disclose. It tests each topic from two angles: impact materiality (how the business affects people and the planet) and financial materiality (how sustainability issues affect the business). A topic is material, and must be reported, if it crosses the threshold on either dimension.

What is the difference between impact and financial materiality?

Impact materiality is the inside-out view: how your operations and value chain affect people and the environment, whether or not that affects your finances. Financial materiality is the outside-in view: how a sustainability matter creates risks or opportunities that affect your cash flows, performance, or access to finance. CSRD requires both; a topic is material if either applies.

How do you do a double materiality assessment?

Per EFRAG Implementation Guidance 1, you map your business and value chain, draw up a long-list of sustainability matters, engage stakeholders, translate matters into specific impacts, risks and opportunities (IROs), score each IRO on impact and financial materiality, set and apply thresholds, then aggregate to a list of material topics. The result drives your ESRS disclosure scope.

What are IROs?

IROs are Impacts, Risks and Opportunities, the unit of analysis in a DMA. An impact is an effect your business has on people or the environment (actual or potential, positive or negative). A risk or opportunity is a sustainability matter that could affect your financial position or performance. Each candidate topic is broken into concrete IROs that are then scored.

What threshold makes a topic material?

There is no single legal number. You define your own cut-off score for impact materiality (based on scale, scope, irremediability and likelihood) and for financial materiality (magnitude of financial effect times likelihood). Thresholds should be informed by quantitative data where possible and documented so an auditor can follow your reasoning under limited assurance.

Is a materiality matrix required under CSRD?

No. ESRS does not require a materiality matrix. The required output is a documented, IRO-based assessment and a list of material topics. A materiality matrix is an optional presentation aid that plots topics on impact and financial axes; many companies now use ranked tables or heat maps instead, because a 2x2 grid can wrongly imply a topic is not material.

What is the difference between double and single materiality?

Single materiality, used by ISSB (IFRS S1/S2) and investor-focused frameworks, asks only whether a sustainability matter affects enterprise value (financial materiality). Double materiality, unique to CSRD/ESRS, adds impact materiality, so a topic with no near-term financial effect can still be material because of its effect on people or planet.

Did the Omnibus change double materiality?

No. The Omnibus I Directive simplified CSRD and cut ESRS datapoints, but double materiality survives as the core principle. EFRAG's revised guidance encourages a lighter top-down approach (conclude materiality at topic level first, then drill into IROs only for topics that pass), reducing effort, but the impact-plus-financial test itself remains.

This is guidance, not legal advice

This page explains double materiality and the DMA in plain English; it is not legal advice. For decisions specific to your business, confirm with the official sources we link or a qualified adviser. A defensible DMA must be documented for your auditor under limited assurance.

Sources

  1. [1]EFRAG Implementation Guidance 1: Materiality Assessmentretrieved 8 Jun 2026
  2. [2]Delegated Regulation (EU) 2023/2772 (ESRS Set 1, incl. ESRS 1)retrieved 8 Jun 2026
  3. [3]European Commission: Corporate sustainability reportingretrieved 8 Jun 2026
  4. [4]European Commission: consultation on the revised ESRS (6 May 2026)retrieved 8 Jun 2026
  5. [5]Council of the EU: sign-off of the Omnibus simplification (24 Feb 2026)retrieved 8 Jun 2026

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