GRI vs ESRS: Key Differences

What is GRI vs ESRS: Key Differences?

Decision rule: Use GRI when the entity reports voluntarily to a global stakeholder base and wants flexibility in disclosure depth. Use ESRS when the entity is within CSRD scope and must produce a legally compliant sustainability statement subject to independent assurance.

When the distinction matters on an engagement

The distinction determines the assurance provider's mandate. A GRI report carries no statutory assurance requirement; the entity may commission voluntary assurance, but scope and level are contractual. An ESRS sustainability statement requires limited assurance under the CSRD, and the assurance provider must evaluate whether the entity applied double materiality correctly (ESRS 1.38–42). That evaluation includes verifying that topics material from a financial perspective (but with limited outward impact) were captured. GRI's single-materiality lens would not flag those topics.

For entities that reported under GRI before the CSRD took effect, the transition creates a specific risk. The GRI-based materiality assessment identifies outward impacts but does not test whether those topics create financial risks or opportunities for the entity. ESRS 1 paragraph 46 requires this second lens. An entity that carries its GRI materiality list into ESRS without adding the financial perspective will produce an incomplete IRO assessment, and the assurance provider flags the gap at the planning stage. The Interoperability Index published by GRI and EFRAG in November 2024 maps GRI disclosures to ESRS datapoints, but mapping disclosures does not substitute for running the double materiality process.

Worked example: Fernandez Distribucion S.L.

Client: Spanish wholesale distribution company, FY 2025, revenue EUR 34M, IFRS reporter, first-time CSRD reporter (Wave 2). Fernandez previously published a voluntary GRI-based sustainability report for four years.

Step 1 — Identify material topics under GRI

Fernandez's existing GRI report covered five material topics identified through stakeholder consultation and impact assessment under GRI 3 (2021): energy consumption (GRI 302), waste (GRI 306), occupational health and safety (GRI 403), diversity and equal opportunity (GRI 405), and anti-corruption (GRI 205). The materiality assessment evaluated outward impact on people and the environment.

Step 2 — Run the double materiality assessment under ESRS 1

Fernandez maps its value chain from supplier sourcing across six EU countries through three distribution centres in Spain to 1,200 retail clients. The team assesses all ESRS sub-topics from Application Requirement 16 against both impact severity and financial effect. The five GRI topics carry over as impact-material. Two additional topics emerge from the financial lens: climate change (ESRS E1) because rising fuel costs represent 18% of operating expenses (EUR 6.1M) and expose the entity to carbon-pricing risk, and workers in the value chain (ESRS S2) because Fernandez relies on 340 subcontracted drivers whose working conditions create reputational and contractual risk.

Step 3 — Map existing GRI disclosures to ESRS datapoints

Using the GRI-ESRS Interoperability Index, Fernandez identifies that its GRI 302 energy disclosures cover approximately 60% of the ESRS E1 energy-related datapoints. Gaps include Scope 3 downstream transport emissions and the climate transition plan required by E1-1. The GRI 403 health and safety disclosures align with roughly 70% of ESRS S1 own-workforce datapoints, but ESRS S1 requires additional disclosures on adequate wages and social protection that GRI 403 does not address.

Step 4 — Prepare the ESRS sustainability statement

Fernandez reports against seven material topical standards (the original five plus E1 and S2). The ESRS 2 general disclosures (GOV-1 through GOV-5, SBM-1 through SBM-3, IRO-1, IRO-2) apply unconditionally. The entity documents three topics assessed as not material under IRO-2, including biodiversity (E4) and resource use (E5), with supporting evidence.

Conclusion: Fernandez's ESRS sustainability statement captures two topics (E1 and S2) that the GRI-only approach missed because the financial materiality lens was absent. If the practitioner had treated the GRI materiality list as sufficient for ESRS purposes without running the double materiality assessment, the sustainability statement would have omitted two material topics and the assurance provider would have flagged an incomplete IRO assessment at the engagement level.

Why it matters in practice

Entities transitioning from GRI to ESRS carry forward their GRI materiality list without performing the financial materiality assessment required by ESRS 1 paragraphs 43–48. The GRI list captures outward impacts but misses topics that are material only because they create financial risks or opportunities for the entity. The assurance provider evaluates the completeness of the double materiality process, not just the resulting topic list.

Teams assume that the GRI-ESRS Interoperability Index means that GRI disclosures automatically satisfy ESRS requirements. The Index maps conceptual alignment at the disclosure level, but ESRS datapoints are more prescriptive than GRI disclosures in many areas. Gaps are concentrated in climate transition planning (E1-1), Scope 3 emissions granularity (E1-6), and value chain worker disclosures (S2). The entity must perform a datapoint-level gap analysis before claiming ESRS compliance based on existing GRI data.

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