Double Materiality Assessment
The double materiality assessment is the foundation of every CSRD report. It determines which sustainability topics you must disclose — and which you can exclude. Get it wrong and your entire report is non-compliant.
The double materiality assessment is the foundation of every CSRD report. Double materiality requires you to assess sustainability topics from two perspectives simultaneously.
What double materiality means
Double materiality requires you to assess sustainability topics from two perspectives simultaneously. Impact materiality asks: how does your business affect people and the environment? Financial materiality asks: how do sustainability issues affect your business's financial performance and position?
A topic is material — and must be disclosed — if it scores sufficiently high on EITHER dimension. This is the OR rule. Most companies under-report because they mistakenly apply an AND rule, requiring high scores on both dimensions before disclosing.
The five steps of a CSRD-compliant assessment
Step 1 — Understand your context: Map your business model, value chain, stakeholders and operating environment. Identify which sustainability topics are relevant to consider.
Step 2 — Identify impacts, risks and opportunities (IROs): For each topic, identify your actual and potential impacts on people and the environment, and the sustainability-related financial risks and opportunities you face.
Step 3 — Assess and score IROs: Score each IRO on the relevant materiality criteria. For impact materiality: scale, scope, and irremediability of negative impacts; scale and scope of positive impacts. For financial materiality: likelihood and magnitude of financial effects.
Step 4 — Determine material topics: Apply the OR rule — if either impact or financial materiality is sufficient, the topic is material.
Step 5 — Stakeholder engagement: Involve affected stakeholders in the assessment process and document their input. This is not optional — EFRAG guidance requires it.
Common mistakes that invalidate your assessment
Applying the AND rule instead of OR is the most common mistake. A topic can be material on impact grounds alone — significant environmental damage — even if there is no financial consequence to your company.
Not involving stakeholders is the second most common finding in assurance reviews. CSRD requires genuine stakeholder engagement, not box-ticking.
Using only internal data is also insufficient. The assessment should draw on sector-specific knowledge, scientific consensus, peer company disclosures and stakeholder input.
Not reassessing annually. The assessment must be reviewed and updated each reporting year — material topics can change as business models evolve and new risks emerge.
What happens with topics you exclude
For any topic you assess as not material, you must provide a brief explanation in your CSRD report. You cannot simply omit non-material topics — the absence of a disclosure must be explained.
Assurers will scrutinise your exclusions. A well-documented exclusion rationale — citing your assessment scores, methodology and stakeholder input — provides the evidence trail needed to defend excluded topics during assurance.
Frequently asked questions
How long does a double materiality assessment take?
First-time assessments typically take 8–16 weeks for a medium-sized company. This includes stakeholder engagement, scoring all relevant topics, board presentation and documentation. ESGMaster's AI can compress initial topic identification to hours.
Does the OR rule mean I must disclose everything?
No. Many topics will score low on both dimensions and can be excluded with a brief rationale. The OR rule means you cannot exclude a topic that scores high on either dimension — you cannot require high scores on both before disclosing.
Who needs to approve the materiality assessment?
The board or equivalent governance body must be involved in the assessment and sign off on the final materiality determination. This governance requirement is documented in ESRS 2 GOV-2.
Can I use my existing GRI materiality assessment for CSRD?
Partially. GRI uses only impact materiality — you will need to add the financial materiality dimension and re-run the scoring. The output format and documentation requirements are also different under ESRS.
What is the difference between IRO and materiality?
IRO stands for Impact, Risk and Opportunity — it is the unit of analysis in the CSRD assessment. You assess each IRO for its impact and/or financial materiality. A topic becomes material when one or more of its associated IROs pass the materiality threshold.