What CSRD actually involves

The Corporate Sustainability Reporting Directive (CSRD) requires in-scope companies to report against the European Sustainability Reporting Standards (ESRS), covering environmental, social and governance topics identified as material through a double materiality assessment. CSRD replaces the NFRD and extends mandatory reporting to all large EU companies and EU-listed SMEs, with third-country companies with significant EU revenue also in scope from 2028. Reports must be published in the management report, machine-readable (iXBRL-tagged), and assured by a third party, at limited assurance from 2024, rising to reasonable assurance as standards develop.

Why it's harder in practice than it looks

Double materiality assessment is the prerequisite for everything else

CSRD requires companies to conduct a structured double materiality assessment before they can determine which ESRS topics are material and therefore require disclosure. This process, combining impact materiality and financial materiality, requires stakeholder engagement, supply chain analysis, and cross-functional input from legal, finance and operations. Companies that underestimate the time required for this step delay their entire reporting programme.

ESRS data requirements go far beyond existing reporting

The ESRS contain hundreds of individual data points across climate, pollution, water, biodiversity, workers, supply chain, business conduct, and governance topics. Most companies currently reporting under GRI or TCFD will find that CSRD requires substantially more granular data, including Scope 3 emissions by category, due diligence processes for human rights, and detailed workforce disaggregation.

Third-party assurance requirements are new for most companies

Many companies have never had their non-financial reporting independently assured. The move to mandatory limited assurance under CSRD requires companies to establish internal controls, document data collection processes, and work with an assurance provider, all of which take time to build from scratch.

Interoperability with other frameworks creates real complexity

ESRS are designed to align with GRI, TCFD and ISSB standards, but the mapping is not perfect and requires companies to understand precisely what each standard requires and where the overlaps and gaps are. Applying multiple frameworks simultaneously without a clear disclosure architecture leads to inconsistencies and rework.

iXBRL tagging and digital reporting are operational challenges

CSRD requires machine-readable reporting using iXBRL taxonomy. Most sustainability teams have no experience with this technical requirement, and the taxonomies are still being developed by EFRAG. Companies that do not engage their finance and IT functions early in the process will face last-minute crises at publication.

What good looks like

A CSRD-ready company has completed a double materiality assessment that has been reviewed by the audit committee, identified the full set of material ESRS topics, mapped existing data collection processes against ESRS data points with gaps clearly documented, established a disclosure governance structure with clear ownership of each data point, engaged an assurance provider before the first reporting year, and produced a gap-closing roadmap with a realistic timeline for reaching full compliance. The strongest programmes are integrated into existing financial reporting cycles rather than run as standalone sustainability exercises.

When to bring in external support

CSRD compliance spans legal interpretation, double materiality methodology, ESG data architecture, iXBRL technology, and assurance preparation, a combination that exceeds the capacity of most internal sustainability teams. Companies that try to build this capability entirely in-house typically take longer and produce lower-quality first reports.

Leafr's network includes CSRD specialists across double materiality, ESRS gap analysis, assurance readiness and iXBRL implementation, with experience supporting companies across financial services, manufacturing and retail sectors, including clients such as Vodafone and Cargill. Teams can be matched within 48 hours of engagement.

Frequently asked questions

What is CSRD and who does it apply to?

The Corporate Sustainability Reporting Directive is an EU regulation requiring large companies and listed SMEs to publish sustainability reports aligned with the European Sustainability Reporting Standards. It applies to large EU companies (over 250 employees, EUR 40m turnover or EUR 20m balance sheet) from reporting years starting January 2025, EU-listed SMEs from 2026, and third-country companies with over EUR 150m net turnover in the EU from 2028.

What is a double materiality assessment under CSRD?

Double materiality requires companies to assess sustainability topics from two perspectives: impact materiality (the company's actual or potential positive and negative impacts on people and the environment) and financial materiality (the sustainability-related risks and opportunities that could affect the company's financial performance). Only topics that are material under one or both lenses need to be reported on in detail. The assessment process must be documented and defensible.

What are the European Sustainability Reporting Standards?

The ESRS are the disclosure standards developed by EFRAG that companies must use to report under CSRD. They cover twelve topic standards across environment (including climate, pollution, water, biodiversity and circular economy), social (including workforce, supply chain workers, affected communities and consumers) and governance (business conduct). There are also two cross-cutting standards covering general requirements and general disclosures.

How does CSRD differ from the NFRD?

The Non-Financial Reporting Directive covered around 11,500 large public-interest entities in the EU and allowed considerable flexibility in what and how companies reported. CSRD expands coverage to approximately 50,000 companies, mandates reporting against the ESRS rather than any recognised framework, requires third-party assurance, and introduces machine-readable digital reporting. It is substantially more demanding in both scope and rigour.

What does CSRD assurance involve?

CSRD requires sustainability reports to be independently assured, starting at limited assurance (broadly comparable to a review engagement) and likely moving to reasonable assurance (comparable to an audit) in subsequent years. Companies need to establish internal controls over sustainability data, document their data collection methodology, and work with a qualified assurance provider, typically their existing auditor or a specialist sustainability assurance firm.

Does CSRD apply to non-EU companies?

Yes, from 2028, non-EU companies with annual net turnover above EUR 150m in the EU and at least one large EU subsidiary or listed EU branch will be in scope. These companies report against a separate simplified standard, the ESRS for third-country undertakings, currently being developed by EFRAG.

How should a company prioritise CSRD implementation if it has limited resources?

Start with the double materiality assessment, as all other reporting decisions depend on it. Simultaneously, map existing data against ESRS requirements to identify the largest gaps. Prioritise data collection for the most material topics and for those where assurance evidence will be required. Engage legal and finance early on iXBRL and governance requirements. Attempting to address all ESRS topics simultaneously without a materiality-led prioritisation is the most common mistake.