Frameworks compared
GRI vs ESRS
One voluntary and global, one mandatory and European — but closely related. Here is what each one is, who each is built for, and the pros and cons of reporting under one over the other.
GRI Standards
The GRI Standards are the world's most widely used voluntary framework for sustainability reporting, published by the Global Reporting Initiative — an independent organisation founded in Amsterdam in 1997. Reporting under GRI is a choice: no law compels you to do it, and no authority has to approve your report before you publish it.
The library is built in three layers: the Universal Standards (GRI 1, 2 and 3) set the method and the general disclosures every report carries, Sector Standards add the issues typical to your industry, and Topic Standards cover individual subjects from emissions and water to employment and supplier conduct. You begin with a materiality assessment — identifying where your business most significantly affects people and the planet — and then report against the topic standards that match.
The output is a public report written for a wide audience: customers, investors, lenders, NGOs, employees. It is flexible in depth and scope, which is both its strength and its cost — you decide how far to go, and you have to defend that decision to whoever reads it.
Who it is for
- Companies of any size, anywhere in the world, reporting voluntarily
- Businesses that need recognition beyond Europe — global customers, lenders, tender panels
- Mid-sized firms that want a serious report now and may fall under EU rules later
- Organisations that want to publish one report for many audiences at once
- Companies that want to control scope and budget rather than follow a fixed checklist
- Organisations whose readers are customers, lenders and staff — not only sustainability specialists
GRI is the global common language. It does not discharge a legal duty, but it is understood further and wider than any EU rulebook.
ESRS (under the CSRD)
The European Sustainability Reporting Standards are the reporting rulebook behind the EU's Corporate Sustainability Reporting Directive. They were drafted by EFRAG, adopted through EU delegated acts, and are legally binding for the companies the CSRD puts in scope. Unlike GRI, this is not a framework you adopt — it is one you are subject to.
ESRS rests on double materiality: you report both on how sustainability issues affect your business and on how your business affects people and the environment. It covers the same ground as GRI — environment, social, governance — but far more prescriptively, with fixed disclosure requirements, structured data tagging, a place inside the management report, and a requirement for external assurance.
The scope has moved. The 2026 simplification round narrowed the CSRD to the largest companies — broadly those with more than about 1,000 employees and over €450 million in turnover — so far fewer businesses report under ESRS than originally planned, while the pressure they pass down their supply chains has not gone away.
Who it is for
- Large EU companies that fall inside the CSRD scope after the 2026 narrowing
- EU-listed companies on regulated markets, with simplified rules and phased timing for SMEs
- Non-EU groups with substantial EU turnover that must report at group level
- Companies that need a report which satisfies a legal duty, is externally assured and is comparable to peers
- Finance, legal and audit teams that have to sign off on assured sustainability data
- Not aimed at small unlisted businesses — for those, the EU's answer is VSME
If you are in scope, ESRS is simply the requirement and the only real question is how efficiently you meet it. If you are not, GRI gives you the credibility without the mandatory machinery.
Pros and cons of one over the other
Reporting GRI-style over ESRS
Pros
- Voluntary and flexible — you scope the effort to what matters, instead of meeting every mandatory disclosure.
- Global reach — GRI is recognised far beyond the EU, which matters for international customers and tenders.
- Decades of practice — comparators, guidance and consultants are abundant; the methodology is battle-tested.
- Lower cost — no assurance requirement and a scope you control keep the budget realistic for non-mandated companies.
Cons
- No legal cover — if you are in CSRD scope, GRI alone does not discharge the duty to report.
- Less structure to lean on — comparability depends on how you apply the standards.
- Double work risk — reporting GRI-style without mapping to ESRS can mean redoing parts if rules catch up with you.
Reporting under ESRS over GRI
Pros
- Compliance — for companies in scope, ESRS reporting is the legal requirement, full stop.
- Built-in comparability — a fixed structure makes your disclosures comparable to peers across the EU.
- Assurance-ready — the standard is designed for external assurance, which raises data credibility.
- If you must report, the decision is made — the real question is how efficiently you get there.
Cons
- High burden — double materiality, value-chain data and assurance demand serious time and budget.
- EU-bound recognition — outside Europe, ESRS carries less weight than GRI with global stakeholders.
- Moving target — delegated acts and simplification rounds keep reshaping the detail you have to implement.
Rule of thumb: if you are legally in CSRD scope, ESRS is not optional — build the process once, efficiently, and reuse GRI-aligned materiality work to fill it. If you are not in scope, GRI gives you global credibility without the mandatory machinery — and the two frameworks are aligned enough that work done for one transfers to the other.
Not sure where you stand?
We help businesses work out whether the CSRD touches them, and build either an ESRS-ready or a GRI Standards-based report without duplicating effort. Start with the free readiness checklist, or get in touch.