CSRD vs ESRS vs GRI vs ISSB: What Is the Difference?

CSRD vs ESRS vs GRI vs ISSB: What Is the Difference?

CSRD, ESRS, GRI, and ISSB are four terms you will see everywhere in ESG and sustainability reporting. For beginners, they can feel confusing because they are often mentioned together. However, they do not mean the same thing.

A simple way to understand them is this: CSRD is the EU law, ESRS are the reporting standards used under that law, GRI is a global impact-reporting framework, and ISSB creates IFRS sustainability standards focused on investor-useful financial information.

Understanding the difference matters because companies, investors, ESG professionals, and sustainability teams need to know which rules apply, what information must be reported, and who the report is mainly for.

What Is CSRD? CSRD ESRS GRI ISSB

CSRD stands for Corporate Sustainability Reporting Directive. It is a European Union law that introduced sustainability reporting requirements for certain companies. The European Commission explains that CSRD requires large companies and listed companies to publish regular reports on social and environmental risks, and on how their activities affect people and the environment.

In simple terms, CSRD answers the question: Who must report?

CSRD is not itself a reporting template. It is the legal framework that tells certain companies they must prepare sustainability information. The first companies started applying the CSRD rules for the 2024 financial year, with reports published in 2025.

This is why CSRD is especially important for companies operating in or connected to the European Union.

What Are ESRS?

ESRS stands for European Sustainability Reporting Standards. These are the standards companies use to report under CSRD.

If CSRD tells companies that they must report, ESRS tells them what they must report and how to structure the information.

EFRAG explains that ESRS include cross-cutting standards and topical standards. Cross-cutting standards apply broadly, while topical standards cover areas such as climate change, pollution, water, biodiversity, workers, communities, consumers, and business conduct.

ESRS are built around the idea of double materiality. This means companies must consider both how sustainability issues affect the company financially and how the company affects people and the environment.

In 2025 and 2026, ESRS simplification became an important official topic. The European Commission adopted targeted “quick fix” amendments in July 2025 for first-wave reporting companies, and in May 2026 it sought feedback on revised sustainability reporting standards intended to reduce burden while keeping the CSRD’s policy objectives.

What Is GRI?

GRI stands for Global Reporting Initiative. The GRI Standards are global sustainability reporting standards focused on an organization’s impacts on the economy, environment, and people. GRI says its standards can be used by any organization, large or small, private or public, to report impacts in a comparable and credible way.

In simple terms, GRI answers the question: How does the organization affect the world?

GRI is widely used for impact reporting. It is especially useful when a company wants to communicate with a broad group of stakeholders, including employees, communities, customers, regulators, civil society, and investors.

GRI is not the same as CSRD. CSRD is EU law. GRI is a global standards system. However, they are connected because both are concerned with sustainability impacts. GRI also notes that it works on interoperability with EFRAG on ESRS and with the ISSB on IFRS Sustainability Disclosure Standards.

What Is ISSB?

ISSB stands for International Sustainability Standards Board. It was created by the IFRS Foundation to develop IFRS Sustainability Disclosure Standards.

The ISSB standards are mainly designed for investors, lenders, and other users of financial reports. IFRS says these standards aim to provide decision-useful, globally comparable sustainability-related disclosures for investor-company dialogue.

The two key ISSB standards are IFRS S1 and IFRS S2. IFRS S1 sets general requirements for disclosing sustainability-related risks and opportunities that are useful to users of general purpose financial reports. IFRS S1 is effective for annual reporting periods beginning on or after 1 January 2024, with earlier application permitted if IFRS S2 is also applied.

IFRS S2 focuses specifically on climate-related disclosures. In December 2025, the ISSB also issued targeted amendments to IFRS S2 greenhouse gas emissions disclosure requirements to support implementation.

In simple terms, ISSB answers the question: What sustainability information do investors need to understand enterprise value and financial prospects?

The Key Difference in One Simple Example

Imagine a manufacturing company with high greenhouse gas emissions.

Under CSRD, the company may be legally required to report sustainability information if it falls within the scope of the EU rules.

Under ESRS, the company must follow detailed European standards to report material sustainability impacts, risks, and opportunities.

Under GRI, the company can report how its emissions affect the environment, communities, and sustainable development.

Under ISSB, the company reports climate-related risks and opportunities that could affect its financial performance, strategy, cash flows, or access to capital.

So the same topic, emissions, can appear in all four systems, but the purpose and audience may be different.

Which One Should You Learn First?

For beginners, the best order is:

First, understand CSRD because it explains the legal requirement in Europe. Then learn ESRS because it explains the actual reporting content under CSRD. After that, study GRI to understand impact reporting. Finally, learn ISSB to understand investor-focused sustainability disclosures.

For ESG and sustainability professionals, all four matter. CSRD and ESRS are essential for European reporting. GRI is important for broader stakeholder impact reporting. ISSB is important for global financial-market reporting and investor communication.

Conclusion

CSRD, ESRS, GRI, and ISSB are connected, but they are not interchangeable.

CSRD is the EU law. ESRS are the EU reporting standards. GRI focuses on organizational impacts on the economy, environment, and people. ISSB focuses on sustainability-related risks and opportunities that matter to investors and financial reporting users.

Once you understand this difference, sustainability reporting becomes much easier to navigate. Instead of seeing four confusing acronyms, you can see four different pieces of the same reporting landscape.