Double materiality assessment explained

What is double materiality?

A sustainability topic is material if it is material from the impact perspective, from the financial perspective, or from both. One of the two is enough. The principle sits in ESRS 1, in the version of Delegated Regulation (EU) 2026/1563 (in force since Nov 10, 2026, applicable to financial years from 2027). It is what distinguishes European reporting from purely investor-focused approaches.

Impact materiality (inside-out)

This covers the actual and potential impacts of the company on people and the environment, along the whole value chain. Negative and positive impacts are assessed — with different criteria.

• Actual negative impacts are assessed on severity alone (scale, scope, irremediability)
• Potential negative impacts on severity and likelihood
• For human rights impacts, severity takes precedence over likelihood
• Positive impacts are assessed on scale and scope — not severity — plus likelihood where they are potential

Financial materiality (outside-in)

This covers sustainability topics that create financial risks or opportunities — how the outside world acts on the company. Assessment uses the likelihood and magnitude of the financial effects.

• Physical risks: extreme weather, raw material scarcity, biodiversity loss
• Transition risks: tighter regulation, technology shifts, changing customer expectations
• Opportunities: new markets, efficiency gains, better financing conditions

The process — and the shorter route

The assessment follows a structured sequence. What is new is that it need not be worked bottom-up.

• Understand context and value chain: business model, sector, locations, upstream and downstream relationships
• Identify impacts, risks and opportunities across the ESRS topic landscape
• Assess the IROs — using the criteria above, which differ by type
• Determine material topics and sub-topics with reasons
• Map the ESRS datapoints to the material topics
• Alternative: the revised standard explicitly allows a top-down route — materiality may be concluded at a higher level without fully assessing every single IRO

How precise does the assessment have to be?

Less formal than many assume. Quantitative scoring is not required — a qualitative assessment can suffice. What is required is reasonable and supportable information available without undue cost or effort. An exhaustive search for every conceivable impact is explicitly not expected. If you introduce a scoring scale, do it for traceability, not because the standard demands it.

Stakeholders: use the results, don't build a separate process

This is where more work gets created than the standard asks for. ESRS 1 makes the results of the engagement that already happens as part of ongoing due diligence a key input to impact materiality. A separate stakeholder process purely for the materiality assessment is not needed. What has to be disclosed, via ESRS 2 IRO-1, is whether and how consultation took place.

• Name the affected stakeholders: employees, customers, suppliers, local communities, providers of capital
• Draw on existing due diligence findings instead of setting up new surveys
• Document and disclose the nature and outcome of the engagement

The outcome steers the report — in both directions

At the end you have a documented list of material topics and sub-topics. Reporting happens at that level, not as "the whole standard". And the revised set draws the consequence both ways: immaterial datapoints must not be disclosed. A reasoned omission is explicitly required only for the climate topic E1.