ESG Reporting Frameworks

Each framework serves a different audience and purpose. GRI (Global Reporting Initiative) is the most widely used global standard for impact-based sustainability reporting - it focuses on how your company affects the world across environmental, social, and governance topics. SASB (now part of the ISSB/IFRS Foundation) focuses on financially material ESG issues by industry - it’s investor-oriented and organized by 77 industry-specific standards. CDP runs an annual disclosure system for climate, water, and forests, primarily driven by investor and customer requests - over 23,000 companies disclose through CDP questionnaires. TCFD (Task Force on Climate-Related Financial Disclosures) provides a framework for reporting climate-related risks and opportunities across governance, strategy, risk management, and metrics. Whether you need all four depends on your stakeholders: investors typically want SASB/TCFD-aligned data, customers and NGOs look for GRI, and CDP scores are tracked by capital markets. Most large companies report across multiple frameworks simultaneously.

There’s significant overlap, particularly on climate/emissions, water, waste, diversity, and governance indicators. GRI 305 (emissions) and CDP’s climate questionnaire cover much of the same GHG data. SASB’s industry metrics often parallel specific GRI disclosures. TCFD’s metrics and targets section draws from the same underlying climate data as GRI and CDP. The practical solution is to build a single ESG data repository with a crosswalk layer that maps each datapoint to every applicable framework. You collect the data once (e.g., Scope 1/2/3 emissions, energy consumption, water withdrawal), validate it once, and then export it in the format each framework requires. Without a crosswalk, teams end up collecting the same metrics through separate processes for each framework - different owners, different spreadsheets, different timelines - and then spend weeks reconciling inconsistencies at year-end.

GRI, SASB, CDP, and TCFD are voluntary frameworks (though CDP responses are increasingly expected by investors and customers). CSRD/ESRS and BRSR are mandatory regulatory requirements - CSRD for in-scope EU companies, BRSR for India’s top 1,000 listed entities. The good news: there’s deliberate interoperability. ESRS was developed with extensive GRI alignment - many ESRS datapoints map directly to GRI disclosures. The simplified ESRS further aligns with ISSB (which absorbed SASB). TCFD’s four-pillar structure is embedded in both ESRS E1 (climate) and ISSB S2. BRSR maps to GRI, SASB, and UNGC principles. So if you’re already reporting under voluntary frameworks, you have a head start on mandatory compliance. The gaps are typically in double materiality (required by CSRD, not by GRI in the same form), digital tagging (XBRL for CSRD), and India-specific indicators (for BRSR).

No - and this is one of the most important distinctions. GRI uses impact materiality: topics are material if your company has a significant impact on the economy, environment, or people. SASB/ISSB uses financial materiality: topics are material if they could reasonably affect enterprise value or financial performance. CSRD/ESRS requires double materiality - both perspectives assessed together, with a topic being reportable if it’s material from either lens. CDP and TCFD are primarily financially oriented but also capture impact data through their questionnaire structure. The practical implication: if you’ve been doing GRI-only reporting, you may have gaps on the financial materiality side (how ESG issues affect your business value). If you’ve been SASB/TCFD-only, you may have gaps on the impact side (how your business affects people and planet). For companies subject to CSRD, both lenses are mandatory regardless of which voluntary framework you’ve historically used.

Each framework follows its own update cycle. GRI publishes revised topic standards periodically - GRI 2021 (Universal Standards) was a major update, and individual topic standards continue to be revised. SASB standards are now maintained by the ISSB, with updates tied to the IFRS Sustainability Disclosure Standards timeline. CDP updates its questionnaire annually (typically released in Q1, with submission deadlines in mid-year). TCFD has been effectively consolidated into ISSB - the Financial Stability Board disbanded the TCFD in 2023 after the ISSB took over its monitoring responsibilities. ESRS updates follow the EU delegated act process (the simplified ESRS is expected by late 2026). BRSR evolves through SEBI circulars. The challenge for multi-framework reporters is that these update cycles don’t synchronize. A governed framework registry that tracks version changes, flags affected indicators, and triggers re-mapping when standards update is the only scalable approach.

It depends on the framework and jurisdiction. For voluntary frameworks: GRI recommends external assurance but doesn’t mandate it. CDP scores benefit from verified data (and CDP has introduced a verification tag for climate data). SASB/ISSB aligns with local regulatory assurance requirements. TCFD disclosures are typically not independently assured unless part of a broader regulatory filing. For mandatory regulations: CSRD requires limited assurance of sustainability disclosures (moving toward reasonable assurance over time), with the sustainability report included in the management report and subject to statutory audit. BRSR Core requires third-party assessment/assurance for India’s top listed entities on a phased schedule. The practical takeaway: even where assurance isn’t strictly required today, building audit-ready evidence trails - version-controlled data, documented methodology, approval logs, source traceability - is essential.