How to Conduct a Double Materiality Assessment Under CSRD

Why Double Materiality Is the Foundation of Sustainability Reporting

The European Union's Corporate Sustainability Reporting Directive (CSRD), enacted through Directive 2022/2464, introduced a fundamental paradigm shift in sustainability reporting. It requires companies to assess sustainability matters not only from the perspective of their financial impact, but also in terms of their impact on the environment and society (European Parliament and Council, 2022).

This approach is called "double materiality" and consists of two dimensions:

• Impact materiality: The company's actual or potential positive or negative impacts on the environment, human rights, and society.
• Financial materiality: The risks and opportunities that sustainability matters create — or may create — for the company's cash flows, financial position, or financial performance.

A topic enters the reporting scope when it is material in at least one of these two dimensions. This guide is designed to help enterprise sustainability teams conduct a double materiality assessment in a systematic way.

Understanding the Regulatory Framework

ESRS 1: General Requirements

ESRS 1, the first standard in the European Sustainability Reporting Standards (ESRS), defines the core principles for double materiality assessments. Adopted through Commission Delegated Regulation (EU) 2023/2772, ESRS 1 requires companies to conduct their materiality assessment with reference to "the expectations of reasonably knowledgeable users" (European Commission, 2023).

Chapter 3 of ESRS 1 lays out the fundamental principles:

• The materiality assessment must cover the company's entire value chain.
• The assessment must consider short-, medium-, and long-term time horizons.
• Both actual and potential impacts, risks, and opportunities must be included.
• Threshold-setting must combine qualitative and quantitative criteria.

EFRAG Implementation Guidance IG 1

The European Financial Reporting Advisory Group (EFRAG) published comprehensive implementation guidance on how to conduct a double materiality assessment in practice. EFRAG IG 1 (Implementation Guidance 1: Materiality Assessment) breaks the process down into four main phases and provides concrete tools for each (EFRAG, 2023).

While this guidance is not legally binding, it is the most comprehensive methodological reference used by auditors and regulators.

Step 1: Context Analysis and Scoping

The first step is to comprehensively map the company's operating context.

Value Chain Mapping

Identify the company's upstream and downstream activities, business relationships, and geographic footprint. ESRS 1 requires the materiality assessment to extend beyond direct operations to the full value chain. However, EFRAG IG 1 recommends a phased approach where value chain information is limited — an assessment based on available data is acceptable in the first years, with scope expanding in subsequent periods (EFRAG, 2023).

Sector-Level Pre-Assessment

Determine which topics from the ESRS topical standards (E1-E5, S1-S4, G1) are likely to be relevant to your sector. While EFRAG's sector-agnostic standards apply to all companies, sector-specific standards have not yet been published. At this stage:

• Sector reports and peer company analyses can inform your long list.
• Regulatory pressures and legal requirements should be factored in.
• Existing environmental and social impact assessments enrich the inputs.

Step 2: Identifying and Engaging Affected Stakeholders

The credibility of a double materiality assessment depends on effective consultation with the right stakeholders.

Stakeholder Mapping

ESRS 1 defines two main categories of stakeholders:

• Affected stakeholders: Individuals or groups directly or indirectly affected by the company's activities — employees, supply chain workers, local communities, consumers.
• Users of sustainability statements: Investors, lenders, insurers, and other financial stakeholders.

Engagement Approach

Stakeholder engagement must go beyond surveys and interviews. EFRAG IG 1 recommends that companies observe the following principles:

• Ensure that the voices of vulnerable or marginalized groups are heard.
• Where direct engagement is not feasible, use proxy sources: academic studies, NGO reports, industry associations.
• Document the engagement process and findings — auditors will request this documentation.

Step 3: Impact, Risk, and Opportunity (IRO) Identification

The most technical phase of the assessment is the systematic identification of potential impacts, risks, and opportunities (IROs).

IRO Assessment for Impact Materiality

Each potential impact is evaluated along two dimensions:

For actual negative impacts:

• Scale: The severity of the impact
• Scope: The breadth of the affected area or number of people
• Irremediable character: The degree to which the impact can be reversed

For potential impacts, in addition to the three criteria above:

• Likelihood: The probability of the impact occurring

Under ESRS 1, likelihood alone cannot be determinative for human rights impacts — scale and irremediable character take precedence (European Commission, 2023).

IRO Assessment for Financial Materiality

The financial implications of each sustainability topic are evaluated as follows:

• Magnitude: The size of the potential financial effect
• Likelihood: The probability of the risk or opportunity materializing

In assessing financial materiality, the company's existing risk management processes and financial planning cycles are natural input sources.

Step 4: Threshold-Setting and Finalization

Setting Thresholds

ESRS 1 does not prescribe a specific quantitative threshold. This requires companies to set thresholds appropriate to their context. For an effective threshold system:

• Define separate thresholds for impact materiality and financial materiality.
• Factor in qualitative elements (regulatory expectations, stakeholder sensitivity) when setting thresholds.
• Document the rationale behind your thresholds — this rationale is critical during the audit process.

Materiality Matrix

Compare identified IROs against your thresholds to produce a materiality matrix. This matrix determines which ESRS topical standards fall within your reporting scope. A topic exceeding the threshold in either the impact or financial dimension is sufficient for it to be considered material.

Board Approval

The results of the double materiality assessment must be approved by the company's administrative body. CSRD requires sustainability reporting to be owned at the board level (Directive 2022/2464, Article 19a).

Common Pitfalls Enterprise Teams Should Avoid

1. Defining the Value Chain Too Narrowly

Focusing only on direct operations causes significant risks and impacts to be missed. Social impacts in the supply chain and downstream environmental effects are frequently overlooked.

2. Reducing Stakeholder Engagement to a Formality

Sending a standard survey does not meet the meaningful stakeholder engagement envisioned by ESRS. Auditors will want to see how stakeholder feedback influenced the assessment results.

3. Conflating the Impact and Financial Dimensions

The two dimensions require different analytical frameworks. A topic may have high environmental impact but low financial risk — or vice versa. Independent assessment of both dimensions is mandatory.

4. Failing to Document "Not Material" Decisions

Explaining why a topic was deemed not material is as critical as explaining why one was. ESRS 1 expects companies to justify why topical standards were excluded from scope.

5. Treating the Assessment as a One-Off Exercise

The double materiality assessment must be reviewed annually. Changes to the business model, regulatory developments, and new scientific findings can invalidate the previous year's conclusions.

Assessment Timeline: A Realistic Schedule

A typical double materiality assessment timeline for a mid-sized organization:

Total duration ranges from approximately 13 to 18 weeks. This applies to the first-time assessment — the update process in subsequent years is significantly shorter.

Next Steps

The double materiality assessment is the most consequential phase of CSRD compliance. It determines which topics you report on, which data you need to collect, and which ESRS disclosure requirements apply to your company.

Action Item: Review your current materiality assessment against ESRS 1 criteria. If you are not incorporating the impact materiality dimension, closing that gap should be your first move.

References:

1. European Parliament and Council, Directive 2022/2464 (CSRD), December 2022.
2. European Commission, Commission Delegated Regulation (EU) 2023/2772 (ESRS), July 2023.
3. EFRAG, Implementation Guidance 1: Materiality Assessment (EFRAG IG 1), 2023.
4. ESRS 1 — General Requirements, European Sustainability Reporting Standards.