ESRS European Sustainability Reporting Standards Defining How Companies Report Under CSRD

Understanding the Framework of Modern Compliance

The introduction of the Corporate Sustainability Reporting Directive (CSRD) marks a systemic shift in how the European Union enforces corporate accountability. Central to this directive are the ESRS — European Sustainability Reporting Standards defining how companies report under CSRD, which provide the technical architecture for modern ESG disclosures. 

We observe a clear transition from voluntary, often fragmented reporting to a rigorous, audited framework that demands the same level of precision as financial accounting. For sustainability directors and procurement officers, these standards are not merely a compliance burden but a strategic necessity to ensure long-term viability in a transparent global market.

At ImpactBuying, we believe that verified data is the only antidote to corporate risk. The ESRS forces companies to move beyond superficial claims and dive into the granular details of their operations and supply chains. This article explores the structure, implementation, and strategic implications of these standards, providing actionable insights for high-level decision-makers.

Key Takeaways

• Mandatory Rigour: ESRS provides the standardised ruleset for disclosures under CSRD, ensuring comparability and transparency across the EU.
• Double Materiality: Companies must report on both how sustainability issues affect their business and how their business impacts people and the planet.
• Value Chain Transparency: Reporting requirements extend into the upstream and downstream value chain, necessitating deep-tier visibility.
• Audit-Ready Data: All disclosures must undergo limited assurance by a third party, making primary-source verification essential.
• Sector-Agnostic vs. Sector-Specific: The framework comprises universal standards (ESRS 1 and 2) and thematic standards covering E, S, and G factors.
• Strategic Alignment: Successful implementation requires integrating ESG data into core procurement and financial systems rather than treating it as a siloed task.

Defining the ESRS: The Technical Backbone of the Corporate Sustainability Reporting Directive (CSRD)

ESRS — European Sustainability Reporting Standards defining how companies report under CSRD represent a comprehensive set of requirements developed by EFRAG (European Financial Reporting Advisory Group). They serve as the “how-to” guide for companies falling under the scope of the CSRD, which replaces the Non-Financial Reporting Directive, detailing exactly which metrics and qualitative information must be published; the sustainability reporting standards esrs were adopted on 31 July 2023 by the European Commission. 

The objective is to harmonise sustainability reporting to allow investors, NGOs, and regulators to compare the performance of different organisations accurately. By utilising these standards, we can eliminate the ambiguity that has historically plagued ESG disclosures, replacing it with actionable, systemic data.

The Architecture of the ESRS

The standards are structured in a modular fashion to ensure both breadth and depth, with an architecture that supports mandatory disclosures across governance, strategy, risk management, and performance metrics. They are categorised into four main areas: Cross-cutting standards, Environmental (E), Social (S), and Governance (G), with topical standards helping organise subject-specific disclosure requirements. This structure ensures that no critical impact area is overlooked, from climate change and biodiversity to workforce conditions and business ethics.

Categoría	Standard Name	Core Focus Areas
Cross-cutting	ESRS 1 & 2	General requirements, general disclosures, and the double materiality process.
Environmental	ESRS E1—E5	Climate change, pollution, water, biodiversity, and circular economy.
Redes sociales	ESRS S1—S4	Internal workforce, value chain workers, affected communities, and consumers.
Governance	ESRS G1	Business conduct, anti-corruption, and management of supplier relationships.

The Concept of Double Materiality and Materiality Assessment

The cornerstone of the ESRS is the concept of double materiality. Unlike previous frameworks that focused primarily on financial risk to the company, the ESRS demands an assessment from two perspectives. You must assess how sustainability matters affect your company’s financial health (outside-in) and how your company’s activities impact the environment and society (inside-out). 

This requires a rigorous assessment process. We recommend that organisations do not treat materiality as a one-time exercise. It must be a verified, iterative process that involves stakeholder engagement, identifying sustainability risks, and data-driven analysis of the entire life cycle of your products.

Impact Materiality vs. Financial Materiality

• Impact Materiality (Inside-Out): Identifying actual or potential positive and negative impacts on people or the environment over the short, medium, and long term.
• Financial Materiality (Outside-In): Identifying risks and opportunities that have, or could have, a material influence on the company’s cash flow, performance, or position.

A sustainability matter is “material” if it meets the criteria for either of these perspectives. Under ESRS — European Sustainability Reporting Standards defining how companies report under CSRD, if a topic is deemed material, you must provide the specific disclosures outlined in the relevant thematic standard.

Navigating the Environmental Standards (ESRS E1-E5)

The ‘E’ in ESG often receives the most scrutiny due to the climate crisis. ESRS E1 (Climate Change) is mandatory for almost all entities because of its systemic importance. It requires detailed reporting on Scope 1, 2, and Scope 3 emissions, as well as transition plans aligned with the 1.5°C goal of the Paris Agreement, and where material this can also include disclosure on the energy mix. These environmental disclosures are also used to assess sustainability performance through measurable outcomes across key sustainability topics. 

However, we must not ignore standards E2 through E5. These address pollution, water and marine resources, biodiversity, and the circular economy. For companies in retail, food, or horticulture, reporting on biodiversity (E4) and water stewardship (E3), including marine resources where relevant, is a strategic necessity because their supply chains are directly dependent on natural capital.

Deep-Tier Visibility in Environmental Reporting

Reporting on Scope 3 emissions or biodiversity impacts requires deep-tier visibility. You cannot accurately report on your environmental footprint if you only have data from your Tier 1 suppliers. We advocate for a radical transparency approach, where primary-source data from the field or the factory floor is used to validate claims about carbon sequestration or chemical usage.

Social Standards and Human Rights (ESRS S1-S4)

The social standards represent reporting requirements that the CSRD significantly expands for human rights and labour conditions. ESRS S2 (Workers in the Value Chain) is particularly challenging for large-scale enterprises with complex global networks. It demands information on how you manage impacts on workers who are not directly employed by you but are integral to your production. 

Compliance with ESRS S2 requires more than a simple code of conduct. You must demonstrate proven impact through active monitoring and remediation processes, and the practical implementation can be difficult across complex value chains. This is where verified auditing services and digital supplier management platforms become indispensable.

Key Areas of Social Disclosure:

1. Policies and Actions: Documented strategies to prevent forced labour, child labour, and discrimination.
2. Grievance Mechanisms: Evidence of functional channels for value chain workers to report abuses without fear of retaliation.
3. Risk Mitigation: Specific steps taken to address identified risks in high-risk geographies or sectors.

Managing Governance and Business Conduct (ESRS G1)

The Governance standard, ESRS G1, focuses on the internal mechanisms that ensure ethical business conduct. This includes anti-corruption measures, whistleblower protection, and the management of relationships with suppliers. In our experience, strong governance is the foundation upon which all other ESG performance is built and helps companies monitor progress on ESG targets. 

You are required to disclose how your board is involved in sustainability matters and how their incentives are linked to ESG targets. This ensures that ESRS — European Sustainability Reporting Standards defining how companies report under CSRD are integrated into the highest levels of corporate leadership, while connecting board oversight to mandatory disclosures on governance, strategy, risk management, and performance metrics.

Why Primary-Source Verification is Non-Negotiable

The ESRS introduces a requirement for “limited assurance.” This means an independent auditor must review your sustainability report and the underlying sustainability data. To pass this audit, your data must be robust, traceable, and backed by evidence. Relying on industry averages or unverified supplier surveys is no longer a viable strategy for risk mitigation. 

We champion the transition to primary-source verification. This involves gathering data directly from the point of impact—whether that is a farm in South America or a textile mill in Southeast Asia. By using proven data, you mitigate the legal risks associated with modern slavery and environmental degradation while improving transparency and auditability under ESRS requirements, while building genuine brand equity.

Implementation Challenges and Strategic Solutions

The transition to ESRS compliance is undeniably complex. Many organisations face data silos, where procurement, legal, and sustainability teams do not share information effectively. Furthermore, the sheer volume of data required across the value chain can be overwhelming. 

To overcome these challenges, we suggest a phased approach:

• Gap Analysis: Compare your current reporting practices against the ESRS — European Sustainability Reporting Standards defining how companies report under CSRD to identify where data is missing.
• Technology Integration: Implement digital platforms that allow for real-time data collection and analysis from suppliers.
• Capacity Building: Train your procurement teams to understand that sustainability metrics are as critical as price and quality.
• External Partnership: Work with specialists who can provide the deep-tier visibility and auditing expertise required for assurance.

Common Pitfalls in ESRS Reporting

One of the most frequent mistakes is treating the ESRS as a “box-ticking” exercise. If your reporting does not reflect your actual operations, you invite significant regulatory and reputational risk. Another error is failing to account for the systemic nature of supply chain issues, such as how water scarcity in one region can lead to social unrest and labour shortages.

The Future Landscape: Sector-Specific Standards

While the current set of ESRS is “sector-agnostic,” EFRAG is developing sector-specific standards alongside the revised ESRS process, with draft revisions expected by 31 July 2025, though the effective date is not yet determined. These will provide even more granular requirements for high-impact industries like agriculture, mining, and energy. Staying ahead of these developments is essential for maintaining compliance. 

We expect these future standards to demand even more rigorous radical transparency. For example, food retailers will likely face much stricter requirements regarding land use and pesticide application throughout their deep-tier supply networks.

Comparing ESRS Sustainability Reporting Standards with Global Frameworks

It is important to understand how the ESRS relates to other international benchmarks like the TCFD (Task Force on Climate-related Financial Disclosures), the ISSB (International Sustainability Standards Board), and the Global Reporting Initiative, with the IFRS Foundation shaping much of the broader global standard-setting landscape around investor-focused disclosures. While there is significant overlap, the ESRS is generally more prescriptive and broader in scope due to its inclusion of social and governance factors under the double materiality mandate.

Feature	ESRS (EU)	ISSB (Global)	GRI (Global)
Enfoque	Double Materiality	Financial Materiality	Impact Materiality
Scope	E, S, and G	Primarily E and S (Financial Fokus)	E, S, and G
Assurance	Mandatory (Limited)	Varies by jurisdiction	Voluntary

Unlike voluntary reporting standards, ESRS is mandatory for in-scope companies while still designed to interoperate with global frameworks.

Data Quality: The Ultimate Compliance Tool

In the world of ESRS — European Sustainability Reporting Standards defining how companies report under CSRD, data quality is your most valuable asset. High-quality data is accurate, complete, and timely. It allows you to make informed decisions about supplier engagement and capital allocation. 

We help companies transform raw supply chain data into actionable insights. This involves moving beyond static spreadsheets to dynamic systems that provide a clear picture of risks and opportunities. When your sustainability report is backed by verified data, it becomes a powerful tool for building trust with stakeholders and investors.

FAQs: Navigating ESRS and CSRD

What is the relationship between CSRD and ESRS?

The CSRD is the legislation (the law) passed by the EU that mandates sustainability reporting. The ESRS — European Sustainability Reporting Standards defining how companies report under CSRD are the specific technical standards that dictate the content and format of those reports. Think of CSRD as the “requirement” and ESRS as the “manual.”

Which companies must report according to ESRS?

The rollout is phased. The first companies were large listed entities already subject to the NFRD, with CSRD reporting starting for FY 2024 from 1 January 2025, so the first reporting year covered reports published after mandatory reporting requirements applied from that date. Other large companies subject to the rules follow for financial years beginning in FY 2027, with reporting from 1 January 2028. Listed SMEs start from 1 January 2029 for FY 2028, while certain non-EU entities with significant operations in the European Union are covered separately in section 13.4.

Is Scope 3 emissions reporting mandatory?

Under ESRS E1, Scope 3 reporting is required if it is deemed material following your double materiality assessment. Given the nature of most modern supply chains, Scope 3 is material for the vast majority of companies, making its disclosure a strategic necessity.

How does ESRS affect non-EU companies?

Non-EU businesses with net turnover of more than €150 million in the EU and at least one subsidiary or branch in the EU exceeding the relevant thresholds will eventually be required to report at a consolidated level using ESRS or equivalent standards; this can bring companies operating in the EU into scope through subsidiaries or branches, and some companies subject to CSRD are captured through national law once the directive is transposed.

What happens if a company fails to comply?

Sanctions for non-compliance are determined by individual EU Member States but can include significant fines and public “naming and shaming.” Perhaps more importantly, non-compliance can lead to a loss of investor confidence and exclusion from key procurement contracts with compliant partners.

Can we use existing GRI reports for ESRS compliance?

While there is a high degree of interoperability between the Global Reporting Initiative (GRI) and ESRS, they are not identical. GRI is one of the better-known voluntary reporting standards and can help companies prepare for ESRS. You will likely need to perform additional data collection and adjust your materiality assessment to meet the specific “double materiality” and assurance requirements of the ESRS — European Sustainability Reporting Standards defining how companies report under CSRD. GRI can also be useful for broader sustainability topics, but ESRS imposes specific disclosure requirements and assurance expectations.

What is “limited assurance” in the context of ESRS?

Limited assurance is a level of audit that provides a lower level of certainty than a “reasonable assurance” audit (typical for financial sessions) but still requires an external auditor to confirm that no material misstatements were identified. It underscores the need for audit-ready, primary-source data.

Taking the Next Step Toward Radical Transparency

The era of vague environmental promises and overlooked supply chain abuses is ending. The ESRS — European Sustainability Reporting Standards defining how companies report under CSRD provide the clarity and structure needed for a truly sustainable global economy. 

We invite you to view these regulations not as a hurdle, but as an opportunity to lead with integrity. By embracing deep-tier visibility and verified data today, you secure your company’s place in an increasingly ethical and transparent market tomorrow. The transition is urgent, the requirements are clear, and the benefits of proven impact are undeniable.