Double materiality assessment: a practical method under ESRS, from value chain map to management sign-off

What a double materiality assessment decides

A double materiality assessment is the analysis a CSRD reporter carries out to decide which sustainability matters belong in its sustainability statement. It looks in two directions. Outwards, at the actual and potential impacts the company has on people and the environment through its own operations and its value chain. Inwards, at the sustainability risks and opportunities that affect, or could reasonably be expected to affect, its cash flows, access to finance and value. The result is the list of material matters, and from it the set of topical ESRS the statement has to follow.

Everything downstream depends on this list: which data points you collect, which policies, actions and targets you write, and what the assurance provider tests. Too generous, and the team drowns in data nobody uses; too narrow, and the assurance provider finds the gap. The standards themselves are covered in CSRD requirements explained, standard by standard.

The two tests: impact materiality and financial materiality

ESRS 1 defines the two perspectives separately. A matter is material from the impact perspective when it relates to the company's material actual or potential, positive or negative impacts on people or the environment. It is material from the financial perspective when it triggers, or could reasonably be expected to trigger, material financial effects on the company. Meeting either test is enough.

Both tests run across short, medium and long-term horizons. A risk that is small this year but grows with a regulatory or physical trend can be material now, and the file should say which horizon drove the conclusion.

A practical method in seven steps

The sequence below follows the process the hub describes and the structure of EFRAG's implementation guidance on the materiality assessment (EFRAG IG 1). Each step produces a document the next one uses.

1. Fix the reporting boundary and map the value chain

Start from the consolidation scope of the financial statements, then map the value chain: key suppliers and raw materials, logistics, customers, product use and end of life. Note the sites, countries and sectors, because those drive where impacts sit.

2. Build the long list

List candidate matters using the environmental, social and governance topical standards of the ESRS as a checklist, then add anything specific to your sector and business model that the list does not capture. Draw on risk registers, ISO 14001 environmental aspects, due diligence records and customer questionnaires; exclude nothing without a written reason.

3. Hear the stakeholders

Identify affected stakeholders (workers in your operations and value chain, local communities, consumers) and the users of the statement (investors, lenders, business partners). Record who was consulted, how, and what they raised, including views you did not adopt.

4. Score impacts

For each impact, decide whether it is actual or potential and negative or positive, then score it against a scale agreed before scoring starts. Sterling's recommended scoring rates a negative impact on how serious it is, how many people or how much of the environment it reaches, and how hard it would be to reverse, then adds likelihood for potential impacts. Define every score in writing so two assessors reach the same answer.

5. Score risks and opportunities

Assess the likelihood and potential size of financial effects, using the thresholds the company already applies in enterprise risk management where they exist. Link each material risk to the part of the financial statements it could touch.

6. Apply thresholds and draw the line

Set the materiality thresholds for both perspectives, apply them, then test the result for sense. Matters close to the line need a documented judgement.

7. Validate, sign off and write it up

Take the result, with the reasoning and the scoring, to management and to the body responsible for sustainability oversight. Their approval, and any changes they made, go in the minutes. The outcome then feeds the ESRS 2 disclosure of how impacts, risks and opportunities were identified, and the data point inventory built next, described in ESRS data points: the inventory and controls.

What the materiality file must contain

The assurance provider does not re-perform your assessment; it asks whether the process you disclose is the process you ran, and whether the evidence supports the result. Build the file with that reader in mind:

• the method: scope, scales, score definitions, thresholds and the reasons for them;
• the value chain map and the long list with the source of each matter;
• the stakeholder engagement plan and log;
• the scored registers for impacts and for risks and opportunities, with the assessor and date for each score;
• the judgements on borderline matters and any exclusions;
• for climate change, if it is assessed as not material, the detailed explanation and forward-looking analysis ESRS 1 requires;
• the sign-off minutes and a change log for later refreshes.

Where materiality assessments go wrong

The most common failure is a workshop opinion presented as an analysis: a heat map produced in an afternoon, with no long list, no traceable scores and no stakeholder voices beyond management.

Other patterns recur. Financial materiality is scored by the sustainability team without finance, so the thresholds bear no relation to the risk register. Positive impacts are counted against negative ones, hiding a harm behind a benefit. The value chain stops at tier one suppliers because that is where data exists. Material matters are chosen to match what is already reported, rather than the reverse. And the assessment is never linked to the data inventory, so a matter is declared material but nothing is measured.

Keeping the assessment current, and the 2027 changes

Because the statement discloses the materiality process every year, the assessment has to hold for each reporting year. A practical rhythm is a documented annual review of the triggers (acquisitions, new sites or products, significant incidents) with a full reassessment when one changes the picture.

Two developments affect the method. The simplified ESRS adopted by the Commission on 3 July 2026, for financial years from 2027 and subject to Parliament and Council scrutiny, were drafted with clearer materiality as one of their aims; what changes is set out in The simplified ESRS: what changes for 2027. And the value chain cap in Directive (EU) 2026/470 means suppliers with up to 1,000 employees may decline requests for information beyond the voluntary standard, so the assessment has to rely on sector data and estimates where supplier data stops. Where the internal audit of the statement tests the materiality file before assurance, CSRD internal audit: testing the statement first explains how.

Double materiality assessment: questions buyers ask