Double materiality assessment explained

What is double materiality?

The principle of double materiality holds that a sustainability topic is material for a company if it is material from either an impact perspective or a financial perspective — or both. It is therefore sufficient for only one of the two perspectives to exceed the threshold. This concept is enshrined in the CSRD and the ESRS and distinguishes European reporting from purely capital-market-oriented approaches.

Impact materiality (inside-out)

The impact perspective examines what actual or potential effects the company has on people and the environment — across the entire value chain. Both positive and negative impacts are assessed.

• Actual negative impacts: existing, demonstrable effects (e.g. CO₂ emissions, working conditions in the supply chain)
• Potential negative impacts: possible future harm, even if it has not yet occurred
• Positive impacts: the company's contributions to social or environmental improvement

Financial materiality (outside-in)

The financial perspective asks which sustainability topics generate financial risks or opportunities for the company — in other words, how the outside world affects the company. This covers physical and transition risks as well as market opportunities.

• Physical risks: climate impacts such as extreme weather, raw material scarcity or biodiversity loss
• Transition risks: tightening regulation, technological change, shifting customer preferences
• Opportunities: new markets, efficiency gains, reputational advantages from sustainability performance

The process: from context analysis to material topics

The double materiality assessment follows a structured workflow that begins with understanding the company context and ends with a reasoned list of material topics.

• Understand context & value chain: analyse the business model, sector, geographic footprint and value chain
• Identify impacts, risks & opportunities (IROs): capture and document all relevant IROs across the ESRS topic landscape
• Assess IROs against thresholds: determine severity (scale, scope, irremediability) and likelihood for each IRO; quantify financial materiality by magnitude and probability
• Determine material topics: classify IROs that exceed the threshold as material, with documented reasoning
• Map to ESRS: assign material topics to the relevant ESRS topical standards and derive disclosure obligations

Stakeholder engagement

ESRS 1 requires companies to involve affected stakeholders in the materiality assessment. Stakeholder input feeds into the identification and scoring of IROs and strengthens the credibility of the process.

• Identify affected stakeholders: employees, customers, suppliers, local communities, investors
• Gather material inputs: interviews, surveys, workshops or analysis of publicly available sources
• Document engagement: disclose the nature, scope and outcomes of stakeholder consultation in the report

The result: material topics as the foundation of the report

The assessment concludes with a reasoned, documented list of material sustainability topics. This list determines which ESRS topical standards must be applied in full and which disclosure requirements apply to the company. Topics that are not material may be omitted — with justification. The materiality list is therefore the central steering instrument for the entire CSRD reporting process.