What ESG reporting standards and frameworks actually involve

ESG reporting standards and frameworks are structured systems that define what information companies should disclose about their environmental, social, and governance performance, and how that information should be presented. Standards are prescriptive, they specify particular metrics, methodologies, and formats (GRI, ISSB, ESRS). Frameworks are principled guidance structures that allow greater flexibility (TCFD, IIRC). The practical work of framework selection involves understanding the regulatory landscape, investor expectations, and the company's own capacity to collect and report data accurately.

Why it's harder in practice than it looks

The landscape of standards is overlapping and still evolving

GRI, ISSB (IFRS S1/S2), ESRS (under CSRD), TCFD, and SASB all coexist with partial alignment and significant differences. The consolidation of SASB into the IFRS Foundation, the alignment of TCFD into IFRS S2, and the design of ESRS to reference GRI reduce (but do not eliminate) duplication. Companies navigating this landscape for the first time frequently find conflicting guidance and parallel data collection obligations that could be rationalised with better framework literacy.

Mandatory and voluntary requirements are jurisdiction-specific

A UK-listed company, an EU-headquartered business, and a US-listed company face completely different mandatory reporting requirements while often sharing investor expectations that push toward similar voluntary disclosures. Mapping the mandatory versus voluntary landscape for a specific company requires legal knowledge across multiple jurisdictions.

Framework selection has downstream consequences for data collection

The choice of framework determines which metrics must be collected, at what granularity, and with what verification requirements. Companies that select frameworks without assessing their data collection feasibility commit themselves to disclosure obligations they may not be able to meet credibly.

Interoperability between frameworks is partial and requires active management

Frameworks that claim interoperability (for example, ESRS referencing GRI, or ISSB referencing TCFD) do not always align perfectly. Producing disclosures that genuinely satisfy multiple frameworks simultaneously requires a disclosure architecture designed for that purpose, not separate reports prepared by different teams.

What good looks like

A well-designed framework approach starts with mapping mandatory regulatory requirements, then layering investor and customer expectations to identify which voluntary frameworks add most value. A disclosure architecture then maps all required data points across frameworks, identifies overlaps to avoid duplication, and assigns ownership for each metric. The result is a single data collection exercise that populates multiple disclosure outputs efficiently.

When to bring in external support

Framework selection and disclosure architecture design are specialist areas where getting it right at the outset saves substantial rework. Leafr's network includes ESG reporting specialists with deep knowledge of GRI, CSRD/ESRS, ISSB and TCFD alignment, supporting companies in selecting the right framework combination and building the data infrastructure to support it.

Frequently asked questions

What are the main ESG reporting standards and frameworks?

The principal standards and frameworks are: GRI (Global Reporting Initiative), impact-focused, broad topic coverage, widely used globally; ISSB (IFRS S1 and S2), investor-focused financial sustainability disclosures; ESRS (European Sustainability Reporting Standards), the mandatory standard for CSRD; TCFD, climate risk and opportunity disclosure; SASB (now incorporated into IFRS Foundation), industry-specific disclosure topics; and CDP, environmental disclosure questionnaire used by investors and supply chain operators.

Are TCFD and ISSB the same?

TCFD (Task Force on Climate-related Financial Disclosures) was disbanded in October 2023 following the publication of IFRS S2, which incorporates and supersedes its recommendations. IFRS S2 (climate disclosures under ISSB) is built explicitly on TCFD's four pillars, governance, strategy, risk management, and metrics and targets, and companies that have been reporting against TCFD are largely aligned with IFRS S2. However, IFRS S2 includes some additional requirements, particularly around Scope 3 disclosure and scenario analysis.

Do GRI and CSRD cover the same topics?

GRI and CSRD cover similar topic areas but use different disclosure architectures and measurement requirements. EFRAG designed the ESRS to reference GRI standards where they align, and many GRI disclosures satisfy corresponding ESRS requirements. However, CSRD requires a double materiality assessment that GRI does not mandate, and ESRS includes some disclosure requirements that go beyond GRI. Companies already reporting under GRI have a head start on CSRD preparation but should not assume their existing disclosures are sufficient.

What is SASB and is it still relevant now that it has merged with ISSB?

SASB (Sustainability Accounting Standards Board) developed industry-specific disclosure standards for financially material sustainability topics. Following the merger into the IFRS Foundation in 2022, SASB standards are now maintained as a reference for companies applying ISSB standards, particularly for identifying industry-specific metrics. They remain relevant as a source of sector-specific disclosure guidance that complements the more general ISSB standards.

How should a company choose between GRI and ISSB for voluntary reporting?

GRI is better suited for companies prioritising disclosure to a broad range of stakeholders, communities, employees, NGOs, and regulators, with a focus on impact. ISSB is better suited for companies prioritising disclosure to financial stakeholders, investors, lenders, and analysts, with a focus on sustainability-related financial risks and opportunities. Many companies in practice use both: GRI for comprehensive sustainability reporting and ISSB (or TCFD) for investor-focused climate and sustainability financial risk disclosure.