ESG Reporting Standards: GRI, SASB & EU CSRD Compliance

The ESG reporting landscape has shifted from voluntary disclosure to regulated requirement faster than most companies anticipated. The EU Corporate Sustainability Reporting Directive (CSRD) alone will require approximately 50,000 companies --- including non-EU companies with significant European revenue --- to publish detailed sustainability reports starting in phased timelines through 2028. Add SEC climate rules, ISSB standards adopted by 20+ countries, and customer-driven disclosure requests, and it becomes clear: ESG reporting is no longer optional.

The challenge is not whether to report, but how. With multiple overlapping frameworks, conflicting terminology, and varying stakeholder expectations, companies need a clear strategy for which frameworks to adopt and how to build reporting infrastructure that serves all of them.

Key Takeaways

• The EU CSRD introduces "double materiality" --- reporting on both how ESG issues affect your business AND how your business affects society and the environment
• GRI is the most comprehensive framework for broad stakeholder communication; SASB/ISSB focuses on financially material ESG factors for investors
• Building a single ESG data infrastructure that serves multiple frameworks is far more efficient than creating separate reporting processes for each
• Companies subject to CSRD must obtain limited assurance on sustainability reports, with reasonable assurance expected by 2028

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The Major ESG Reporting Frameworks

Global Reporting Initiative (GRI)

Founded: 1997 | Headquarters: Amsterdam | Users: 10,000+ organizations globally

GRI provides the most comprehensive sustainability reporting framework, covering environmental, social, and governance topics across all industries. It uses a modular structure:

• GRI Universal Standards (2021) --- Apply to all organizations (foundation, general disclosures, material topics)
• GRI Sector Standards --- Industry-specific guidance (oil and gas, agriculture, mining, coal, etc.)
• GRI Topic Standards --- Detailed disclosure requirements for specific ESG topics (emissions, water, labor, anti-corruption, etc.)

Key feature: GRI requires reporting on the organization's most significant impacts on the economy, environment, and people --- regardless of whether those impacts are financially material. This "impact materiality" perspective makes GRI reports particularly useful for communities, employees, NGOs, and governments.

Sustainability Accounting Standards Board (SASB)

Founded: 2011 | Now part of: IFRS Foundation (merged with ISSB) | Users: 1,800+ companies

SASB provides industry-specific sustainability disclosure standards focused on financially material ESG factors. It covers 77 industries across 11 sectors, identifying the specific ESG issues most likely to affect financial performance in each.

Key feature: SASB is investor-focused. It answers the question "which ESG factors are most likely to affect enterprise value?" rather than "what are all the organization's sustainability impacts?"

| Industry | Number of SASB Topics | Example Financially Material Topics | |----------|----------------------|-------------------------------------| | Technology & Communications | 5--8 per industry | Data privacy, energy management, employee engagement | | Healthcare | 4--7 per industry | Drug safety, access to medicines, ethical marketing | | Extractives & Minerals | 6--10 per industry | GHG emissions, air quality, community relations | | Consumer Goods | 4--8 per industry | Product safety, supply chain labor, packaging | | Financials | 5--8 per industry | Integration of ESG in lending, business ethics | | Transportation | 5--7 per industry | Fuel management, accident safety, labor practices |

Task Force on Climate-related Financial Disclosures (TCFD)

Founded: 2017 (by the Financial Stability Board) | Status: Responsibilities transferred to ISSB in 2024

TCFD established the four-pillar framework for climate disclosure that has become the global standard:

1. Governance --- Board and management oversight of climate risks and opportunities
2. Strategy --- How climate risks and opportunities affect business strategy and financial planning
3. Risk Management --- How climate risks are identified, assessed, and managed
4. Metrics and Targets --- What metrics and targets are used to assess climate performance

Although TCFD has formally transferred its monitoring responsibilities to the ISSB, its four-pillar framework is embedded in virtually every major regulatory requirement and disclosure standard.

International Sustainability Standards Board (ISSB)

Founded: 2021 (under the IFRS Foundation) | Standards: IFRS S1 (general) and IFRS S2 (climate)

The ISSB aims to create a global baseline for sustainability disclosure, similar to how IFRS provides global accounting standards. IFRS S1 covers general sustainability-related financial disclosures; IFRS S2 covers climate-specific disclosures.

Key feature: Designed as a global baseline that jurisdictions can adopt or build upon. Already adopted or endorsed by 20+ countries including the UK, Canada, Japan, Australia, Singapore, Nigeria, and others.

EU Corporate Sustainability Reporting Directive (CSRD)

Adopted: 2022 | Standards: European Sustainability Reporting Standards (ESRS) | Scope: ~50,000 companies

The CSRD is the most ambitious mandatory sustainability reporting requirement globally. It replaces the earlier Non-Financial Reporting Directive (NFRD) and dramatically expands scope, detail, and enforcement.

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Framework Comparison Matrix

| Feature | GRI | SASB/ISSB | TCFD | EU CSRD/ESRS | |---------|-----|-----------|------|-------------| | Materiality approach | Impact materiality | Financial materiality | Financial materiality (climate) | Double materiality | | Scope | All ESG topics | Financially material ESG | Climate only | All ESG topics | | Industry-specific | Sector standards (limited) | 77 industry standards | No | Sector standards (in development) | | Mandatory/Voluntary | Voluntary | Voluntary (but adopted by regulators) | Voluntary (superseded by ISSB) | Mandatory (EU + non-EU with EU revenue) | | Assurance required | Recommended | Depends on jurisdiction | No | Yes (limited, then reasonable) | | Primary audience | Broad stakeholders | Investors | Investors/regulators | Broad stakeholders + regulators | | Data format | Flexible | Quantitative focus | Qualitative + quantitative | Structured digital (XBRL) | | Climate scenarios | Not required | Required (IFRS S2) | Required | Required | | Value chain coverage | Expected | Material value chain impacts | Upstream and downstream | Full value chain |

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EU CSRD: What Companies Need to Know

The CSRD deserves detailed attention because of its mandatory nature, broad scope, and the concept of double materiality.

Who Must Report

| Phase | Companies | First Reporting Year | |-------|-----------|---------------------| | Phase 1 | Companies already subject to NFRD (large public-interest entities, 500+ employees) | 2024 (reports published 2025) | | Phase 2 | Large companies meeting 2 of 3: 250+ employees, 50M+ revenue, 25M+ assets | 2025 (reports published 2026) | | Phase 3 | Listed SMEs, small credit institutions, captive insurance | 2026 (reports published 2027) | | Phase 4 | Non-EU companies with 150M+ EU revenue and at least one EU subsidiary or branch | 2028 (reports published 2029) |

Double Materiality

The CSRD's most distinctive feature is the double materiality assessment:

Financial materiality (outside-in): How sustainability matters affect the company's financial performance, position, and cash flows. Example: how climate change might damage coastal facilities or disrupt supply chains.

Impact materiality (inside-out): How the company's operations affect people and the environment. Example: how factory emissions contribute to air pollution in surrounding communities.

A topic is material if it is material from either perspective. This means companies must report on issues that are significant from a stakeholder impact perspective even if they do not (yet) affect the bottom line.

European Sustainability Reporting Standards (ESRS)

The CSRD is the law. ESRS are the detailed standards companies must follow:

| Standard | Topic | Key Disclosures | |----------|-------|-----------------| | ESRS E1 | Climate change | GHG emissions (Scope 1, 2, 3), transition plans, carbon pricing | | ESRS E2 | Pollution | Air, water, and soil pollution, substances of concern | | ESRS E3 | Water and marine resources | Water consumption, discharge, marine ecosystem impact | | ESRS E4 | Biodiversity and ecosystems | Land use, species impact, ecosystem services | | ESRS E5 | Resource use and circular economy | Material flows, waste, circular practices | | ESRS S1 | Own workforce | Working conditions, diversity, health and safety | | ESRS S2 | Workers in value chain | Supply chain labor practices, human rights | | ESRS S3 | Affected communities | Community impacts, indigenous rights | | ESRS S4 | Consumers and end-users | Product safety, data privacy, accessibility | | ESRS G1 | Business conduct | Anti-corruption, lobbying, payment practices |

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Conducting a Materiality Assessment

A materiality assessment identifies which ESG topics are most important for your organization to measure, manage, and report. It is the foundation of credible ESG reporting under any framework.

Step 1: Identify Potential Topics

Start with the universe of ESG topics defined by your target framework(s). GRI provides a comprehensive topic list. ESRS defines specific topics with sub-topics. SASB identifies industry-specific material topics.

Step 2: Assess Financial Materiality

For each topic, evaluate:

• How might this topic affect revenue, costs, assets, or liabilities?
• Over what time horizon (short, medium, long-term)?
• How significant is the potential financial impact?
• How likely is the impact to occur?

Step 3: Assess Impact Materiality

For each topic, evaluate:

• How does your organization actually or potentially impact people or the environment on this topic?
• How severe is the impact (scale, scope, irremediability)?
• How likely is the impact?
• Is the impact caused by the organization, contributed to, or linked to through business relationships?

Step 4: Engage Stakeholders

Gather input from investors, employees, customers, suppliers, communities, and regulators. Their perspectives inform which topics matter most.

Step 5: Determine Material Topics

Map topics on a double materiality matrix with financial materiality on one axis and impact materiality on the other. Topics that score high on either axis are material and should be included in reporting.

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Building ESG Reporting Infrastructure

Data Collection Strategy

The biggest challenge in ESG reporting is not the report itself --- it is collecting reliable data from across the organization and value chain.

Environmental data sources:

• Utility bills (electricity, gas, water) from facilities management
• Fuel purchase records from fleet management
• Waste manifests from waste haulers
• Raw material consumption from ERP purchasing modules
• Logistics data from transportation management systems

Social data sources:

• HR systems (headcount, diversity, turnover, training hours, incidents)
• Supplier questionnaires and audit results
• Customer complaint and safety incident records
• Community investment and engagement records

Governance data sources:

• Board composition and committee structures
• Policy documentation (anti-corruption, whistleblowing, data privacy)
• Compliance incident records
• Executive compensation structures

Technology for ESG Reporting

Integrating ESG data collection into your existing ERP system is the most efficient approach for most companies. Rather than deploying a separate sustainability platform, configure your ERP to capture environmental and social metrics alongside financial and operational data.

For carbon accounting specifically, ERP integration ensures that energy, fuel, material, and logistics data flow automatically into emission calculations without manual extraction. See our detailed guide on Carbon Footprint Tracking for Manufacturers: Scope 1, 2 & 3 Emissions for implementation details.

For the broader strategic context on green ERP and sustainability operations, see our pillar guide on Sustainable Business Operations: ESG Reporting, Carbon Tracking & Green ERP.

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Common Reporting Mistakes

Mistake 1: Reporting Everything Instead of Material Topics

Producing a 200-page sustainability report that covers every possible ESG topic dilutes the most important information and overwhelms readers. Focus on material topics identified through a rigorous materiality assessment.

Mistake 2: Inconsistent Boundaries

Reporting on different organizational boundaries for environmental vs. social vs. governance metrics makes data incomparable year over year. Define your organizational boundary once and apply it consistently.

Mistake 3: Ignoring Scope 3

Companies that report only Scope 1 and 2 emissions are presenting an incomplete picture. For most companies, Scope 3 represents 70--90% of their total carbon footprint. Investors and regulators increasingly expect at least an estimate of material Scope 3 categories.

Mistake 4: Treating Reporting as a Standalone Project

Annual report compilation exercises are expensive and error-prone. Building data collection into daily operational processes --- through ERP integration, automated data feeds, and embedded KPIs --- produces more reliable data at lower cost.

Mistake 5: No Internal Assurance Before External Audit

Waiting for your external auditor to find data errors is expensive and undermines credibility. Implement internal review processes, data quality checks, and reconciliation procedures before submitting to external assurance providers.

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Frequently Asked Questions

Can I report under multiple ESG frameworks simultaneously?

Yes, and most companies do. The frameworks are designed to be compatible. GRI and ISSB published a joint guide on interoperability. The CSRD/ESRS standards reference GRI concepts. The key is building a single data infrastructure that captures information at sufficient granularity to serve all frameworks, rather than creating separate data collection processes for each.

How much does CSRD compliance cost?

Estimates range widely depending on company size, complexity, and current maturity. First-year costs for Phase 2 companies (large companies) typically range from 100,000 to 500,000 euros, covering materiality assessment, data infrastructure, staff training, reporting, and limited assurance. Ongoing annual costs are usually 40--60% of first-year costs as processes mature and automate.

What is the penalty for non-compliance with CSRD?

Penalties are set by individual EU member states. They include fines (typically linked to revenue), public naming, and potential personal liability for directors. More significantly, non-compliance can affect access to EU capital markets, public procurement eligibility, and relationships with EU-based customers and partners who need supply chain sustainability data.

Should a mid-sized company start with GRI or SASB?

If your primary audience is investors and you want to focus on financially material topics, start with SASB (now ISSB) standards for your industry. If you have a broader stakeholder base and want comprehensive impact reporting, start with GRI. If you are or will be subject to CSRD, you must follow ESRS regardless --- but GRI experience translates well to ESRS compliance because ESRS builds on many GRI concepts.

How does the ISSB relate to SASB and TCFD?

The ISSB was created by the IFRS Foundation to consolidate the fragmented sustainability reporting landscape. It absorbed the SASB standards (which inform its industry-specific guidance) and the TCFD framework (which provides the structural basis for IFRS S2 climate disclosures). Think of ISSB as the successor to both SASB and TCFD, designed to become the global baseline for investor-focused sustainability disclosure.

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What Is Next

ESG reporting complexity is not going away, but the frameworks are converging. The ISSB is creating a global baseline, ESRS is the detailed European implementation, and GRI continues to serve the broadest stakeholder audience. Companies that invest in robust data infrastructure now --- capturing environmental, social, and governance data alongside financial and operational metrics --- will find compliance increasingly manageable as these frameworks continue to align.

The most efficient path is to integrate ESG data collection into your existing ERP and operational systems. This eliminates the manual data scramble at reporting time, improves data quality, and makes sustainability metrics as visible and actionable as financial metrics.

ECOSIRE helps companies implement ERP solutions with integrated sustainability tracking and ESG reporting capabilities. Our Odoo consultancy team can configure your system to capture the data you need for GRI, SASB, ISSB, or CSRD compliance --- all from a single operational platform.

Contact us to discuss your ESG reporting requirements and build a compliance roadmap.

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Published by ECOSIRE --- helping businesses scale with AI-powered solutions across Odoo ERP, Shopify eCommerce, and OpenClaw AI.