Running your first double materiality assessment: A step-by-step playbook

Why double materiality sits at the centre of CSRD reporting 

The CSRD changed how organisations identify and report on sustainability topics. Rather than working through a predefined list of ESG issues, organisations now have to work out for themselves which topics genuinely matter, through a structured assessment known as a double materiality assessment (DMA). 

Unlike a traditional financial materiality assessment, double materiality asks organisations to look at sustainability from two complementary angles. The first considers how environmental, social and governance issues might create financial risks or opportunities for the business. The second looks the other way: how the organisation's own activities affect people, society and the environment. 

The outcome of this assessment determines exactly which topics an organisation has to disclose under the ESRS. So the quality of the double materiality assessment has a direct bearing on how solid, credible and complete the resulting sustainability report turns out to be. For a lot of organisations, the real difficulty isn't grasping the concept itself, it's turning it into a practical process that a team can actually run and repeat. 

One piece of good news on that front: the ESRS were formally simplified on 3 July 2026, cutting the number of mandatory data points by roughly 61% and, usefully for this guide, clarifying that a full double materiality assessment does not need to be redone from scratch every year. A lighter annual review to catch significant changes is enough in most years, with a full reassessment reserved for when something material shifts, a new business line, a material acquisition, or a substantial change to the value chain, for example. That makes the first assessment more of a one-off investment than an annual obligation, which is worth bearing in mind as you plan the resourcing for this. 

Understanding the two dimensions of double materiality 

Before starting, it's worth being clear on the difference between the two dimensions you'll be assessing. 

Impact materiality 

Impact materiality looks at the organisation's positive and negative impacts on people and the environment. This typically covers things like: 

The assessment considers both actual and potential impacts, along with their scale, scope and likelihood. 

Financial materiality 

Financial materiality looks at how sustainability-related issues might affect the organisation's own financial performance, enterprise value or long-term resilience. Examples include: 

Taken together, these two lenses give a far more rounded picture of sustainability risk and opportunity than either one would on its own. 

Step 1: Define the assessment scope 

Start by pinning down exactly what the assessment will cover. That means establishing: 

If you operate internationally, it's worth checking early on whether sustainability impacts differ meaningfully by region, since a one-size-fits-all scope can miss real local issues. Getting the governance clear at this stage pays off in consistency later. 

Step 2: Understand the business context 

Before you start identifying sustainability topics, build a solid picture of how the business actually operates. That usually means reviewing: 

This groundwork is what stops the assessment turning into a generic tick-list exercise. It should reflect how your business genuinely operates, not a standard template borrowed from elsewhere. 

Step 3: Identify relevant sustainability topics 

Next, build out a comprehensive list of sustainability matters that could be relevant to the organisation. Most organisations draw on: 

Topics commonly fall under three headings: 

Environmental: climate change, water resources, pollution, circular economy, biodiversity 

Social: workforce, diversity and inclusion, human rights, value-chain workers, community impacts, consumers 

Governance: business conduct, ethics, anti-corruption, risk management, board oversight 

Resist the urge to narrow this list too early. The goal here is a comprehensive starting point, not a shortlist. Prioritisation comes later. 

Step 4: Map and engage stakeholders 

Stakeholder engagement is one of the things that separates a genuinely useful double materiality assessment from a box-ticking exercise. Start by identifying who might influence, or be affected by, the sustainability issues you're assessing. Typical groups include: 

Engagement can take several forms, including interviews, workshops, surveys, focus groups, or drawing on consultation processes you already run. Stakeholder input validates your priorities and often surfaces perspectives that internal analysis alone would miss entirely. 

Worth knowing here: the simplified ESRS introduced a cap on how much information large companies can request from smaller suppliers in their value chain, built around the Voluntary SME (VSME) standard. If your stakeholder engagement includes SME suppliers, keep your information requests proportionate rather than passing your full reporting burden down the chain. 

Step 5: Assess impact materiality 

With your topic list in hand, evaluate the organisation's impacts on people and the environment. Assessments typically weigh up: 

Consider both positive and negative impacts, across the organisation's own operations and, where relevant, further into the value chain. This step usually needs input from sustainability, operations, procurement and legal teams working together rather than one function working alone. 

On value-chain data specifically, the simplified ESRS have eased the pressure here too. Companies now have more flexibility to use reasonable estimates for value-chain data rather than needing to chase down primary data from every supplier, and can concentrate assessment effort on the parts of the value chain where material impacts are genuinely likely to arise, rather than needing exhaustive coverage everywhere. 

Step 6: Assess financial materiality 

The financial materiality assessment looks at how sustainability topics could affect performance over different time horizons. Factors commonly assessed include: 

Most organisations get more consistent, better-governed results by aligning this step with their existing enterprise risk management process rather than running it as a standalone exercise. 

Step 7: Prioritise and score material topics 

Once both assessments are complete, bring the results together to decide which topics are actually material for reporting purposes. Many organisations use a structured scoring methodology that weighs: 

The traditional two-axis materiality matrix has long been the default way to visualise this, but under the CSRD it's worth making sure your scoring methodology aligns properly with ESRS requirements rather than relying on the matrix alone. Whatever method you land on, document it clearly and apply it consistently, since this is exactly the kind of detail an assurance provider will want to see. 

Step 8: Validate results through governance 

Scoring alone isn't the finish line. Build in a governance process to review and sense-check the findings, typically involving: 

This step is what turns a set of scores into a defensible, evidence-based set of conclusions that genuinely reflect organisational strategy, and it sets you up well for assurance further down the line. 

Step 9: Document the methodology 

Documentation is one of the most commonly shortchanged stages of a double materiality assessment, and one of the most consequential to get right. Keep clear records of: 

Good documentation earns its keep twice over: it makes the process defensible to an assurance provider now, and it makes updating the assessment far quicker next time, particularly useful given you are no longer expected to redo the full exercise every year. 

Step 10: Integrate findings into reporting and strategy 

The double materiality assessment shouldn't just feed into sustainability reporting. Material topics increasingly shape: 

Done well, the assessment becomes a genuine strategic decision-making tool rather than a once-a-year reporting exercise that gets filed away and forgotten. 

Common challenges organisations face 

The process looks tidy on paper, but most organisations hit a few recurring snags along the way: 

Many organisations also underestimate how long it takes to build genuine consensus across functions and get sign-off on the final results. Building in enough time for that is often the difference between a credible assessment and a rushed one. 

Moving beyond compliance 

For most organisations, the first double materiality assessment is a genuine learning exercise. It's usually undertaken to meet CSRD requirements, but its value runs well beyond regulatory compliance. 

A well-run assessment sharpens an organisation's understanding of sustainability risk, stakeholder expectations and long-term opportunity. It strengthens governance, improves strategic decision-making, and gives future sustainability reporting a solid foundation to build on. And now that a full reassessment isn't required every year, the effort you put into getting the first one right pays dividends for longer than it used to. 

As reporting expectations continue to evolve, most organisations will keep revisiting and refining their assessments rather than treating them as a one-off. Building a robust, transparent and repeatable process now will support not just CSRD compliance, but broader organisational resilience and long-term value creation too.