CSRD vs. GRI, ISSB, and TCFD: How Sustainability Reporting Frameworks Compare

If your company is preparing for sustainability reporting, you've likely encountered a confusing alphabet soup: CSRD, ESRS, GRI, ISSB, TCFD, and more. Each framework has different origins, audiences, and requirements — yet they overlap significantly. Understanding how they relate is essential to building an efficient compliance strategy that avoids duplicated effort.

In this guide, we break down the four most important sustainability reporting frameworks, explain where they converge and diverge, and offer practical advice for companies navigating multiple obligations simultaneously.

The Four Frameworks at a Glance

Before diving into comparisons, let's establish what each framework is and who it serves.

CSRD and ESRS

The Corporate Sustainability Reporting Directive (CSRD) is the EU's mandatory sustainability reporting regulation. It requires companies to report under the European Sustainability Reporting Standards (ESRS) — a set of 12 detailed standards covering environmental, social, and governance topics. The CSRD is legally binding for approximately 50,000 companies operating in the EU, including non-EU companies with significant EU revenues.

Key characteristics:

• Mandatory for in-scope companies
• Uses a double materiality approach (both financial impact and impact on people/environment)
• Requires third-party assurance
• Covers the full ESG spectrum across 12 ESRS standards

GRI (Global Reporting Initiative)

The GRI Standards are the world's most widely used voluntary sustainability reporting framework. Established in 1997, GRI has been the de facto standard for corporate sustainability reporting for over two decades. More than 10,000 organizations in over 100 countries use GRI.

Key characteristics:

• Voluntary (though increasingly referenced in regulation)
• Uses an impact materiality approach (focused on the company's impact on the world)
• Modular structure with topic-specific standards
• Stakeholder-inclusive — designed for broad audiences

ISSB (IFRS S1 and S2)

The International Sustainability Standards Board (ISSB), part of the IFRS Foundation, published its first two standards — IFRS S1 (General Requirements) and IFRS S2 (Climate-Related Disclosures) — in June 2023. The ISSB standards are designed for capital markets and are being adopted by jurisdictions worldwide, including the UK, Australia, Japan, Canada, and Brazil.

Key characteristics:

• Investor-focused — designed for capital markets decision-making
• Uses financial materiality only (information that affects enterprise value)
• Built on the TCFD framework (see below)
• Becoming mandatory in multiple jurisdictions

TCFD (Task Force on Climate-related Financial Disclosures)

The TCFD was established in 2015 by the Financial Stability Board and published its recommendations in 2017. It focuses exclusively on climate-related risks and opportunities across four pillars: Governance, Strategy, Risk Management, and Metrics & Targets. The TCFD has been formally disbanded as of October 2023, with monitoring responsibilities transferred to the ISSB — but its framework lives on inside both the ISSB and CSRD.

Key characteristics:

• Climate-only (not full ESG)
• Framework/recommendations, not detailed standards
• Four-pillar structure widely adopted globally
• Now embedded in ISSB S2 and ESRS E1

Head-to-Head Comparison

Materiality Approach

This is the single biggest philosophical difference between the frameworks:

• CSRD/ESRS: Double materiality — companies must report on topics that are financially material AND topics where the company has significant impacts on people and the environment, even if those impacts don't (yet) affect the bottom line.
• GRI: Impact materiality — focused on the organization's impacts on the economy, environment, and people. Closest to the "outward" half of double materiality.
• ISSB: Financial materiality — focused exclusively on sustainability matters that affect enterprise value. What investors need to know.
• TCFD: Financial materiality with a climate lens — climate risks and opportunities that affect the company's financial position.

For a deeper dive into how double materiality works in practice, see our step-by-step guide to double materiality assessment.

Scope and Coverage

Aspect	CSRD/ESRS	GRI	ISSB	TCFD
Topics	Full ESG (E1–E5, S1–S4, G1)	Full ESG (modular)	General + Climate (more topics coming)	Climate only
Mandatory?	Yes (EU law)	Voluntary	Varies by jurisdiction	Was voluntary; now superseded
Assurance	Required (limited → reasonable)	Optional	Varies by jurisdiction	Not specified
Value chain	Full value chain including Scope 3	Encouraged	Required where material	Recommended
Digital tagging	XBRL required	Not required	Expected in most adoptions	Not specified

Audience and Purpose

Understanding who each framework serves explains many of their design differences:

• CSRD serves regulators, investors, civil society, employees, and communities — the broadest audience of any framework.
• GRI serves all stakeholders, with particular emphasis on affected communities and civil society.
• ISSB serves investors and capital markets — it explicitly aims to help investors assess enterprise value.
• TCFD served investors, lenders, and insurance underwriters.

Where the Frameworks Overlap

Despite their differences, there is significant convergence:

ESRS and GRI: Close Cousins

EFRAG (the body that developed ESRS) collaborated closely with GRI during the development of the ESRS. The result is a high degree of interoperability. According to GRI's own mapping, approximately 80% of ESRS disclosure requirements correspond to GRI disclosures. If your company already reports under GRI, you have a substantial head start on CSRD compliance.

Key overlaps include:

• Workforce disclosures (GRI 401–405 ↔ ESRS S1)
• Emissions reporting (GRI 305 ↔ ESRS E1)
• Water and biodiversity (GRI 303, 304 ↔ ESRS E3, E4)
• Anti-corruption and governance (GRI 205 ↔ ESRS G1)

ESRS and ISSB: The Climate Bridge

ESRS E1 (Climate Change) incorporates the TCFD four-pillar structure, which is also the backbone of ISSB S2. This means that climate disclosures under ESRS E1 substantially overlap with ISSB S2. EFRAG has published an interoperability mapping showing that companies compliant with ESRS E1 will have covered most ISSB S2 requirements.

However, the double materiality layer in ESRS means you'll report on climate impacts even when they aren't financially material — something ISSB does not require.

TCFD Lives On

Although the TCFD is formally disbanded, its four-pillar structure (Governance, Strategy, Risk Management, Metrics & Targets) is embedded in both ISSB S2 and ESRS E1. If you've been reporting against TCFD, that work maps directly to both frameworks.

Practical Strategy: How to Handle Multiple Frameworks

For companies facing obligations under more than one framework — or voluntarily adopting several — here's how to build an efficient approach.

1. Start With CSRD/ESRS as Your Foundation

If your company is in scope for the CSRD, make ESRS your primary reporting foundation. It's the most comprehensive framework and — thanks to the interoperability work — covers most of what GRI and ISSB require. Build your data collection, materiality assessment, and reporting processes around ESRS first.

2. Map Gaps, Don't Duplicate

Once your ESRS reporting is in place, map the gaps to other frameworks rather than building parallel processes. The key gaps to watch:

• GRI → ESRS: A few GRI-specific disclosures (like GRI 207 on tax) don't have direct ESRS equivalents. Add these as supplementary disclosures if you want to maintain GRI compliance.
• ISSB → ESRS: ISSB has some specific quantitative requirements around climate risk scenarios and financial impacts that go beyond ESRS E1 in granularity. If you report in a jurisdiction adopting ISSB, review the EFRAG interoperability guidance.

3. Build a Unified Data Architecture

The biggest practical challenge isn't framework differences — it's data collection. Whether you're reporting under one framework or four, you need the same underlying data: emissions figures, workforce metrics, governance structures, value chain information, and more.

Invest in a centralized sustainability data platform rather than framework-specific data silos. This reduces cost and improves data quality across all frameworks.

4. Get Expert Help Early

Navigating multiple frameworks is complex, especially for companies new to sustainability reporting. A qualified CSRD consultant can help you design an integrated approach from the start, potentially saving significant time and cost compared to tackling each framework separately.

What About Companies Outside the EU?

Non-EU companies face a particularly interesting situation. If you have significant EU operations, you may fall under the CSRD. Simultaneously, your home jurisdiction may be adopting ISSB standards. And you may already report under GRI voluntarily.

The good news: the convergence between frameworks means that a well-designed reporting process can serve multiple obligations. The frameworks aren't competing — they're converging, each addressing a different facet of the same underlying need for transparency.

For SMEs that aren't directly in scope for the CSRD but face pressure from larger customers in their value chain, voluntary GRI reporting or the upcoming VSME (Voluntary SME) standard can be a proportionate first step.

The Future: Continued Convergence

The trend is clear — sustainability reporting frameworks are converging, not diverging. EFRAG, GRI, and the ISSB have formal cooperation agreements. The European Commission has committed to ensuring ESRS interoperability with global standards. And national regulators adopting ISSB are building bridges to both GRI and ESRS.

For companies, this means the investment you make today in sustainability reporting infrastructure will pay dividends as frameworks continue to align. The key is to start with a solid foundation, focus on data quality, and design your processes for flexibility.

Key Takeaways

• CSRD/ESRS is the most comprehensive framework — if you're in scope, build around it
• GRI has ~80% overlap with ESRS — existing GRI reporters have a major head start
• ISSB focuses on investor-relevant financial materiality — its climate standard overlaps significantly with ESRS E1
• TCFD is now embedded in both ISSB and ESRS — its legacy lives on
• Don't build parallel processes — map frameworks against each other and fill gaps
• Invest in data infrastructure — it's the foundation that serves all frameworks

Need help navigating multiple sustainability reporting frameworks? Find a CSRD expert who can design an integrated compliance strategy tailored to your company's specific obligations.