The Corporate Sustainability Reporting Directive (CSRD, Dir. 2022/2464/EU) is the most sweeping sustainability disclosure regulation in EU history. Wave 1 listed companies with more than 500 employees began reporting for financial year 2024 (published in 2025). Compliance requires a double materiality assessment, ESRS-aligned disclosures across up to 12 topic areas, Scope 3 emissions data, limited third-party assurance, and XBRL digital tagging. Non-compliance exposes companies to significant fines and reputational damage in all 27 EU member states.

1. What is CSRD and who must comply?

CSRD entered into force on 5 January 2023 and applies in three successive waves, progressively extending mandatory reporting obligations from large listed companies to all large companies and eventually to listed SMEs. The directive is directly linked to the European Green Deal and the EU sustainable finance taxonomy, meaning CSRD disclosures feed directly into the criteria investors and banks use to classify sustainable economic activities.

Unlike its predecessor NFRD, CSRD introduces four fundamental changes: (1) mandatory use of common standards (ESRS), (2) third-party assurance of sustainability information, (3) digital tagging using XBRL, and (4) explicit inclusion of value chain information — meaning you must report not just on your own operations but on the sustainability impacts and risks across your upstream suppliers and downstream customers.

For a CFO, the key immediate implication is that sustainability data is now subject to the same rigour, audit trail and board-level sign-off as financial data. For a Head of Sustainability, it means moving from voluntary frameworks (GRI, CDP, TCFD) to a mandatory, standardised and audited regime with legal consequences for non-disclosure or inaccuracy.

2. The 3 waves of CSRD reporting

CSRD reporting obligations are phased across three waves to allow companies of different sizes adequate preparation time. Understanding which wave applies to your organisation is the first critical compliance step.

Note: Wave 2 deadlines may be affected by the EU omnibus simplification proposal (see Section 6). Always verify against the transposition law in your member state.

3. ESRS standards: the 12 disclosure areas

The European Sustainability Reporting Standards (ESRS) were published by EFRAG and adopted by the European Commission through Delegated Regulation EU 2023/2772. They cover over 1,000 possible data points, though only a subset will apply to each company after the double materiality assessment.

Two cross-cutting standards (ESRS 1 and ESRS 2) are mandatory for all in-scope companies. The remaining 10 topical standards are mandatory only if the related topic is assessed as material.

4. Double materiality: the heart of CSRD

Double materiality is the conceptual cornerstone of CSRD and the step that determines which of the 10 topical ESRS standards apply to your company. It requires assessment from two simultaneous perspectives, as defined in ESRS 1.

A topic is material — and therefore triggers reporting obligations — if either dimension applies. Companies must document their materiality assessment methodology in the sustainability statement, and auditors will scrutinise both the process and the outcomes. EFRAG has published sector-specific implementation guidance with long-lists of potentially material topics to accelerate the assessment process.

Practical note: ESRS E1 (climate change) is so broadly relevant that EFRAG guidance suggests treating it as presumptively material unless there is a well-documented and defensible reason to exclude it. The burden of proof for non-materiality is high.

5. Scope 3 emissions: the biggest data challenge

ESRS E1 requires disclosure of greenhouse gas emissions across all three scopes. For most companies, Scope 3 — all indirect emissions occurring across the value chain — represents between 70% and 90% of the total carbon footprint. Collecting this data requires engaging hundreds or thousands of suppliers and customers, making it the most resource-intensive part of CSRD compliance.

Under ESRS E1-6, Scope 3 disclosure is conditional on materiality — but if Scope 3 exceeds 40% of total GHG emissions, disclosure is required regardless of the materiality outcome. In practice, this threshold is met by virtually every manufacturing, retail and financial services company.

The GHG Protocol Corporate Value Chain (Scope 3) Standard defines 15 upstream and downstream emission categories. The most significant for most sectors are:

• Category 1 (Purchased goods and services): Typically the largest category for manufacturers and retailers.
• Category 11 (Use of sold products): Critical for automotive, electronics and energy companies.
• Category 15 (Investments): The dominant category for banks and insurance groups.

Spend-based estimation using emission factors (e.g. from Exiobase or DEFRA) is acceptable as a starting point, but ESRS encourages a progression toward primary data collection from suppliers. Companies should set multi-year transition plans to improve Scope 3 data quality.

6. The EU omnibus simplification proposal (February 2025)

In February 2025, the European Commission published the EU Omnibus Simplification Package, a legislative proposal aimed at reducing the regulatory burden on companies while maintaining the ambition of the European Green Deal. For CSRD specifically, the proposal includes several significant changes that compliance teams must monitor.

Key proposed changes as of mid-2026:

• Scope reduction: Raising the employee threshold from 250 to 1,000 employees for Wave 2 companies, which could remove up to 80% of currently in-scope Wave 2 entities from mandatory reporting obligations.
• Postponement of Wave 2 and Wave 3: A two-year delay in reporting obligations for companies not already in Wave 1 (former NFRD scope).
• Reduced ESRS disclosure requirements: Proposals to cut the number of mandatory data points and to make more disclosure requirements voluntary rather than mandatory-if-material.
• Value chain simplification: Limiting the obligation to collect sustainability data from suppliers, particularly for smaller tier-2 and tier-3 suppliers.

Important caveat: As of July 2026, the omnibus proposal is still being negotiated through the EU co-legislative process. Wave 1 companies (former NFRD scope) remain fully subject to CSRD and ESRS for FY2024. Companies in other waves should continue preparation while monitoring legislative developments through EFRAG and the European Parliament's Environment Committee.

7. How AI RAG reduces CSRD reporting time

Retrieval-Augmented Generation (RAG) is an AI architecture that combines a large language model with a retrieval engine trained on a specific document corpus. For CSRD compliance, a RAG system trained on the full ESRS standards, EFRAG implementation guidance, XBRL taxonomy and sector-specific guidance can act as an always-available compliance expert.

IgeraRegTech has processed over 340 distinct ESRS disclosure requirements across 12 corporate clients. The core workflows where RAG delivers the greatest time savings are:

• ESRS mapping: Given a company's existing data inventory (ESG KPIs, GHG inventory, HR metrics), the RAG identifies which ESRS data points are already satisfied, which have data gaps and which can be excluded pending materiality. Average time: 3.2 hours vs. 18 hours for a manual senior consultant review.
• Double materiality facilitation: RAG surfaces the EFRAG long-list for the company's sector, pre-populates impact and risk descriptions, and generates an initial draft materiality matrix that the sustainability team validates rather than creates from scratch.
• Disclosure drafting: For each material ESRS data point, the RAG generates a structured disclosure draft citing the exact paragraph and data point number, ready for review and factual population by subject-matter experts.
• Supplier questionnaire analysis: RAG ingests supplier sustainability responses in multiple formats (PDF, Excel, web portals) and extracts the relevant metrics for Scope 3 category calculations.

The 82% reduction in mapping time translates directly into lower external consulting fees and faster report preparation — a critical advantage as Wave 2 companies face their first CSRD deadline in 2026 with limited internal expertise.

Frequently asked questions about CSRD 2026

1. What is double materiality under CSRD?

Double materiality means assessing sustainability topics from two directions simultaneously. Impact materiality asks whether your company affects people or the environment (inside-out). Financial materiality asks whether sustainability risks or opportunities affect your company's financial performance (outside-in). A topic is material — and triggers ESRS reporting obligations — if it clears either threshold. Both assessments must be documented, justified and available for audit review.

2. Which companies are exempt from CSRD?

Current CSRD exemptions include: micro-enterprises (fewer than 10 employees and annual turnover below €2M), companies already consolidated in a parent's CSRD-compliant group sustainability statement, and listed SMEs until FY2026 (with an opt-out until 2028). The EU omnibus proposal under negotiation may substantially expand these exemptions for Wave 2 companies by raising the threshold to 1,000 employees. Third-country subsidiaries of EU-listed groups are captured through the group consolidation obligation.

3. What does the EU omnibus proposal mean for CSRD?

The February 2025 omnibus proposal is a Commission legislative initiative to simplify sustainability reporting. If enacted as proposed, it would delay Wave 2 reporting by two years, reduce the number of mandatory ESRS data points, raise the employee threshold from 250 to 1,000 employees, and limit value chain due diligence obligations. However, the proposal requires co-decision by the European Parliament and Council and may be amended significantly. Wave 1 companies are not affected regardless of the outcome.

4. How does CSRD relate to TCFD and IFRS S1/S2?

ESRS E1 (climate change) was designed with interoperability in mind. Its financial materiality dimension aligns with the TCFD framework (physical risks, transition risks, scenario analysis). IFRS S1 and S2, developed by the ISSB, take a single-materiality approach focused purely on enterprise value. CSRD/ESRS goes further with the additional impact-materiality dimension. Companies already reporting under TCFD will find significant overlap in climate governance, risk management and scenario analysis disclosures, but will need to add Scope 3 category detail and the impact-materiality layer not required by IFRS S2.

5. What are the penalties for not complying with CSRD?

CSRD delegates enforcement to member states, so penalties vary by jurisdiction. In most EU countries, failure to publish a required sustainability statement or publishing materially false information is treated as an administrative infraction, with fines that can reach a percentage of annual turnover. Additionally, non-compliant companies may be excluded from public procurement procedures and may face restrictions on access to EU-regulated sustainable finance instruments, including green bonds and ESG-linked loans where CSRD compliance is increasingly a covenant condition.

6. How can AI help with ESRS mapping?

AI RAG systems trained on ESRS standards, EFRAG guidance and sector-specific documentation can dramatically accelerate the disclosure mapping process. Instead of a consultant manually cross-referencing your data inventory against 1,000+ ESRS data points, a RAG system identifies gaps, suggests exclusion justifications, drafts disclosure text, and flags XBRL taxonomy tags — all with source citations. IgeraRegTech clients reduce ESRS mapping time from an average of 18 hours to 3.2 hours per engagement, freeing sustainability teams to focus on data collection and stakeholder engagement rather than regulatory cross-referencing.