Double materiality assesses two lenses in parallel: how sustainability topics affect the company (financial materiality) and how the company affects people and the environment (impact materiality). A topic is material if either lens flags it.
This guide walks through a defensible eight-step process, the documentation auditors expect, and the common ways first-year assessments fail.
The eight-step process
1. Define assessment scope and value chain. 2. Long-list sustainability topics from + sector guidance. 3. Identify impacts, risks, and opportunities (IROs) for each topic. 4. Engage stakeholders (internal + external). 5. Score each IRO on severity, likelihood, and financial magnitude. 6. Set materiality thresholds. 7. Validate with governance body. 8. Document methodology, thresholds, and outcome.
What auditors actually test
Not the final list — the methodology. They will ask: how did you long-list topics? Which stakeholders did you engage and why? How did you score severity? Where did the thresholds come from? Who signed off? Every one of these needs a written answer.
Interactive tool
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CSRD & VSME applicability checker
Answer four questions to see which sustainability reporting regime applies to your company and when it kicks in.
Result
In scope
VSME (voluntary standard for SMEs)
Not in scope of CSRD, but VSME is the recommended framework for value-chain requests.
Applicability is our best estimate based on published EU thresholds; consult your auditor for a formal determination.
Common first-year failures
Skipping stakeholder engagement. Scoring without a rubric. Applying identical thresholds to financial and impact materiality without justification. No governance sign-off. Treating the assessment as a one-off instead of an annual refresh.
FAQ
Frequently asked questions
Do I need external stakeholders?
Yes. CSRD requires 'affected stakeholders' input, especially for impact materiality. Suppliers, customers, and affected communities are the typical set.
What thresholds should I use?
There's no prescribed number. Common practice: 5-point scales, threshold at 3.5–4 for materiality. Document the reasoning.
Can I outsource the assessment?
You can use consultants for facilitation, but governance sign-off and methodology ownership must remain internal.
Run your double materiality assessment inside one platform
Vuneli digitizes the full process — long-list, stakeholder surveys, IRO scoring, thresholds, and audit trail — mapped to ESRS topics.
