CSRD reporting: from scramble to system

The companies that submitted their first CSRD-compliant reports in 2025 largely did so under duress. Data was gathered manually, double materiality assessments were rushed, and assurance providers were brought in far too late to add anything beyond a signature. The second cycle, now underway for the larger in-scope entities under the Corporate Sustainability Reporting Directive, offers a different opportunity: not just to comply, but to build infrastructure that makes compliance cheaper and more defensible each year.

The gap between those two modes, scramble versus system, is almost entirely a governance and data architecture decision. It is not a question of budget. Companies that spend heavily on point solutions without fixing underlying data ownership will scramble again in 2026 and 2027. The ones that build the system now will find that CSRD reporting starts to feel closer to financial close than to a fire drill.

Building the system: a concrete sequence

Step 1: Lock the materiality mapmapUsing software to automate repetitive marketing tasks and campaigns, enabling personalisation at scale across channels like email, web, and social.View full definition → before touching a data point

Double materiality assessment is not a checkbox. It determines which disclosure requirements actually apply to your organisation, which means it drives every downstream data collection decision. Run the impact materiality and financial materiality assessments with a defined cross-functional panel: typically, the CFO, Chief Sustainability Officer, a board-level risk committee member, and at least two business unit heads. Document the rationale for each inclusion and exclusion. If your assurance provider questions the scope, that documentation is your first line of defence.

Companies like Schneider Electric and Unilever have published multi-year materiality frameworks where the methodology is visible and traceable. That transparency is increasingly what auditors expect, not just a heat map attached to the annual report.

Step 2: Map data to owners, not to systems

The instinct is to buy software. The prior question is: who in the organisation is accountable for each data point? Scope 1 and 2 emissions belong somewhere between finance and facilities. Scope 3 category 1 (purchased goods and services) sits partly in procurement. Workforce data on injury rates and pay gaps lives in HR. Until each ESRS disclosure requirement has a named owner, a defined source, and a refresh cadence, any software you deploy will collect garbage more efficiently.

Build a simple data dictionary: one row per disclosure requirement, with columns for data owner, source system, collection frequency, and the name of the person who signs off on accuracy. This is low-tech and high-value.

Step 3: Integrate sustainability data into the financial close process

The 2026 CSRD cycle requires that sustainability information published in the management report meets the same coherence standards as financial statements. That means your sustainability numbers need to go through a process that looks like financial close: cut-off dates, reconciliations, management sign-off, and version control. If your finance team closes the books in ten working days and your sustainability team is still gathering data six weeks later, you have an integration problem, not a software problem.

Practically, this means adding sustainability data collection to the month-end calendar for the four to six metrics that require frequent refresh (energy consumption, headcount, lost-time injury rate, for example), while others are collected quarterly or annually. The European Financial Reporting Advisory Group's ESRS implementation guidance is specific about this: sustainability reporting must be prepared with the same rigour applied to financial reporting.

Step 4: Bring your assurance provider into the process twelve months early

Limited assurance under CSRD is not the same as a management representation letter. Assurance providers are reviewing the process by which data is collected, not just the output. Deloitte, PwC, KPMG and EY have all published guidance noting that the biggest cause of qualified or delayed opinions in first-year CSRD engagements was inadequate process documentation. Engage your provider in Q1 of the year being reported, not Q4.

Ask them to run a readiness review against your data dictionary and your close process. The findings will tell you exactly where to invest the next twelve months.

Step 5: Build the taxonomy and tagging architecture before drafting the narrative

The CSRD requires machine-readable reporting using the European Single Electronic Format (ESREF, based on iXBRL). If your sustainability team is drafting a narrative in Word and your finance team is tagging it retrospectively, you will create errors and rework. The tagging logic needs to be designed at the same time as the disclosure structure, ideally within whatever report production tool your team uses. Several reporting platforms (note: Workiva, Envizi, and Sweep are vendor products with a commercial interest in this recommendation) offer integrated ESRS-to-iXBRL tagging. Evaluate them against your existing financial reporting infrastructure before committing.

Pitfalls that derail good intentions

The most common failure is treating the double materiality assessment as a one-time exercise. Business models change, regulatory environments shift, and the assessment needs a formal annual review. Companies that filed a materiality map in 2025 and consider it done are exposed.

A second failure is letting the sustainability team own the CSRD process without meaningful CFO involvement. The directive is explicit that the management report, which includes CSRD disclosures, is the responsibility of the board and the administrative body. CFO signature is on the line. That changes the internal governance calculus.

The third failure is underestimating Scope 3. Category 15 (investments) and category 11 (use of sold products) are systematically underreported because the data does not exist internally. Companies in automotive, financial services, and consumer goods that have not started working with suppliers and portfolio companies on data collection are already behind.

Quick wins to start this week

• Pull the list of ESRS disclosure requirements applicable to your sector and run a gap analysis against what data you currently collect, without waiting for a software vendor to do it.
• Schedule a one-hour meeting between finance, HR, and sustainability to agree on who owns the top ten highest-materiality data points.
• Send a one-page brief to your assurance provider asking them to confirm their CSRD readiness review process and their availability for a process audit in Q1 2027.
• Check whether your current iXBRL tagging tool supports ESRS taxonomy, or whether you need a separate solution before next filing.

The finance teams that will find CSRD manageable in three years are the ones that treat the second reporting cycle as an infrastructure project. The data dictionary, the close calendar integration, and the assurance relationship are not overhead. They are the system. Build it once and it compounds.