The double materiality assessment is the foundational process in CSRD reporting. Before a company can determine what to disclose, it must complete this assessment — identifying which sustainability topics are material, from two different perspectives. The assessment is not just a precondition for reporting; it is itself a required disclosure under ESRS.
What Double Materiality Means
Materiality in sustainability reporting has two distinct dimensions under CSRD:
Impact Materiality (Inside-Out Perspective)
How does the company's activity impact the environment and society?
This perspective asks: what environmental and social effects does our business create — through our operations, our value chain, and our products? Impacts can be:
- Actual or potential
- Positive or negative
- Reversible or irreversible
Examples of impact materiality considerations:
- A manufacturer's Scope 1 and 2 emissions and their contribution to climate change
- A tech company's data centre energy consumption and associated land and water use
- A logistics company's air and noise pollution from fleet operations
- A SaaS company's supplier practices, including labour conditions in hardware supply chains
The company's impacts on nature and people — not whether those impacts affect the company financially.
Financial Materiality (Outside-In Perspective)
How do sustainability issues create financial risks and opportunities for the company?
This perspective asks: which environmental, social, and governance topics could affect our business's financial position — our revenues, costs, assets, liabilities, and access to finance?
Examples of financial materiality considerations:
- Physical climate risk (flooding, heat stress) affecting operational facilities
- Transition risk (carbon pricing, regulatory change) affecting energy-intensive operations
- Regulatory compliance costs for environmental standards
- Reputation risk from social controversies affecting customer relationships
- Opportunities from the transition to a circular economy
How a Topic Becomes Material
Under ESRS, a sustainability topic is material and requires full reporting if it passes the impact materiality threshold, the financial materiality threshold, or both. These are not cumulative — passing either one is sufficient.
Thresholds:
For impact materiality: the impact is significant based on its severity (scale, scope, irremediability) — or, for potential impacts, its likelihood and severity.
For financial materiality: the sustainability topic creates significant risks or opportunities that have or could have a significant financial effect.
The definition of "significant" is not prescribed — companies must exercise judgement, documented in their assessment process.
The Double Materiality Assessment Process
Step 1: Understanding Your Business and Context
Before assessing topics, document:
- Your business model, activities, and value chain
- The geographic locations where you operate
- The sectors and industries you are part of
- The stakeholder groups affected by or interested in your activities
Step 2: Identifying the Full List of Potential Topics
Start from the ESRS topic list (all 10 topical ESRS) and sub-topics. Add any company or sector-specific topics that are not covered in the ESRS list. You now have a long list of potential sustainability topics to assess.
Step 3: Impact Assessment for Each Topic
For each potential topic, assess:
- Actual impacts: What impacts does the company currently have (positive and negative)?
- Potential impacts: What impacts could the company have under plausible scenarios?
- Severity assessment: Scale (how widespread), scope (who affected), irremediability (can it be undone)?
- Likelihood (for potential impacts): How likely is the impact to occur?
Step 4: Financial Risk and Opportunity Assessment
For each potential topic, assess:
- Does this topic create financial risks (physical, transition, liability) for the business?
- Does this topic create financial opportunities?
- What is the significance of the financial effect?
Step 5: Stakeholder Engagement
ESRS requires that stakeholder perspectives inform the materiality assessment. Conduct or reference:
- Engagement with affected stakeholders (employees, communities, suppliers)
- Engagement with users of sustainability information (investors, lenders, customers)
Step 6: Applying Materiality Thresholds
Apply the significance thresholds to determine which topics are material. Document:
- Which topics are material on impact grounds
- Which topics are material on financial grounds
- Which topics were assessed and found not material (with justification)
Step 7: Materiality Assessment Documentation
The process and conclusions must be documented:
- Methodology used
- Who was involved (governance, management, external stakeholders)
- The topics assessed and the conclusion for each
- The justification for materiality decisions
This documentation is itself a required CSRD disclosure.
Common Mistakes in Double Materiality Assessments
Scope too narrow: Assessing only own operations while ignoring supply chain impacts that are, in many sectors, the largest part of a company's actual impact.
Threshold too conservative: Concluding almost everything is immaterial to reduce reporting scope. Regulators and assurance providers will challenge assessments that produce implausibly narrow material topic lists.
No stakeholder input: Completing the assessment as a desk exercise without genuine stakeholder engagement. ESRS requires evidence of stakeholder input.
Not revisited: Treating the DMA as a one-time exercise. Material topics change as the business changes. CSRD requires periodic reassessment.
Confusing DMA with risk assessment: Financial materiality is not the same as your enterprise risk assessment. A risk that is on your risk register may not meet the materiality threshold; a sustainability impact that is not on your risk register may be financially material.