EU Green Claims Directive 2026: what 'substantiation' really means for your environmental claims
Article 4 in plain language: the substantiation obligation
The term "substantiation" in EU law is more demanding than it sounds. It does not mean "having some evidence." Under the proposed Green Claims Directive, substantiation is a structured, pre-market process with specific procedural requirements. Companies that conflate "we have data" with "our claim is substantiated" will be surprised when enforcement begins.
Article 4 of the GCD sets out the substantiation standard in four interlocking requirements:
- Scientific assessment — The environmental impact, aspect, or performance being claimed must be assessed using a recognised scientific methodology (Product Environmental Footprint for product-level claims, Organisation Environmental Footprint for company-level claims, or sector-specific methodologies where applicable). The assessment must cover all relevant lifecycle stages, not just the stage that produces the best result.
- Comprehensive evidence — The assessment must use "reliable, internationally recognised" sources and current scientific knowledge. It cannot use cherry-picked studies, industry-commissioned reports as sole sources, or data that has been superseded by more recent research.
- No significant trade-offs — The claim must reflect the product's or company's overall environmental profile, not selectively highlight one positive dimension while obscuring significant negative impacts in other areas. A product made from recycled materials but manufactured with highly polluting processes cannot be claimed as "eco-friendly" on material composition alone.
- Prospective claims require verifiable plans — Any claim about future environmental performance ("we will be carbon neutral by 2030") must be supported by a credible, transparent, time-bound plan with verifiable milestones. Aspirational language without a published implementation plan fails the substantiation test.
Pre-notification: the most disruptive procedural requirement
The most operationally disruptive element of the GCD for marketing teams is not the scientific assessment requirement — it is the pre-market notification requirement.
Under the draft GCD, before any new environmental claim is communicated to consumers, the company must notify the competent national authority in the member state where the claim will be made. This notification must include the substantiation documentation and the assessment underlying the Statement of Conformity.
What this means in practice:
- Environmental claims cannot be added to product packaging or advertising as a spontaneous marketing decision. They require a lead time of several months.
- Each new claim — including reformulations of existing claims — may require a new notification cycle.
- The competent authority has a defined review period (the draft text suggests 30 working days for standard review) during which the company must not yet make the claim.
- Existing claims made before the GCD enters into force will benefit from a transition period — but companies must begin the substantiation process for carry-over claims from the date of application.
This procedural timeline is why companies should start the substantiation process now, even with the GCD not yet in force. Preparing the scientific assessment and lining up an accredited third-party verifier takes 3-6 months for a single product claim — and companies with large product portfolios must prioritise which claims to maintain and which to retire.
The Statement of Conformity: what verifiers check
The Statement of Conformity (SoC) is the key output of the third-party verification process. Accredited verifiers — expected to be accredited under the EU's EN ISO/IEC 17029 standard — are responsible for checking that the company's substantiation documentation meets the GCD's requirements before issuing the SoC.
Verifiers will assess four dimensions:
| Verification Dimension | What Verifiers Check | Common Failure Points |
|---|---|---|
| Methodology appropriateness | Is the PEF or other recognised method applied correctly for the claim type? | Using sector-specific data where generic data is required, or vice versa |
| Data quality | Are primary data used where required? Are secondary data sources current and credible? | Stale lifecycle inventory data, supplier data without verification |
| Claim-to-assessment alignment | Does the language of the claim match precisely what was assessed? | Claim overstates what the assessment covers (e.g., claims cover full lifecycle but assessment only covers use phase) |
| Trade-off disclosure | Are significant negative environmental impacts disclosed alongside positive claims? | Omitting upstream impacts when claiming downstream benefits |
The SoC must be published on the company's website and accessible via a data carrier (QR code or equivalent) on the product or packaging where the claim appears. This creates a permanent, public audit trail — regulators, NGOs, and competitors can verify any substantiated claim against its SoC.
Comparative claims: the strictest category
Comparative environmental claims — "30% lower carbon footprint than the industry average," "twice as energy-efficient as conventional products," "the most sustainable option in its category" — face a higher evidentiary bar than absolute claims. This is where most compliance failures will occur.
The GCD's comparative claim requirements:
- Identical scope — Both the product being promoted and the benchmark must be assessed across the same lifecycle stages. Comparing a product's use-phase footprint against a competitor's full lifecycle footprint is not permitted.
- Same methodology — Both the product and the benchmark must use the same assessment methodology. Industry-average benchmarks must themselves be calculated using the same PEF or sector methodology as the individual product assessment.
- Same reference year — Data used for the comparison must come from the same year. Comparing current product data against industry-average data from 5 years ago creates a false positive.
- Same geographic market — Energy-related claims must reflect the energy mix of the market where the product is sold. A product's carbon footprint in a market powered by renewables is not directly comparable to the same product in a coal-heavy grid.
- No significance without statistical basis — Claims of superiority must reflect a difference that is statistically significant given the uncertainty ranges of the underlying data. A 2% difference in carbon footprint, within the margin of error of the assessment methodology, does not support a comparative claim.
These requirements make most "lower than industry average" claims essentially impossible to sustain without a significant, independently verified gap between the product and the benchmark. Vague competitive claims ("a greener choice") are prohibited entirely under Annex I as generic claims.
The prohibited claims list (Annex I): what is banned outright
The GCD's Annex I establishes a list of claims that are prohibited regardless of what evidence a company can produce. These are treated as inherently misleading — no substantiation process can rehabilitate them. Companies currently using these claim types must retire them before the GCD's application date.
The current draft Annex I prohibits:
- Generic environmental claims without substantiated performance: "eco-friendly," "green," "natural," "sustainable," "responsible," "environmentally conscious," "climate-neutral" (when based on offsets rather than actual reductions), "climate positive," "carbon positive"
- Carbon offset neutrality claims: Any claim that a product is "carbon neutral," "net zero," or "climate neutral" based primarily or exclusively on purchasing carbon offsets, rather than actual verified emission reductions in the product's lifecycle
- Future commitment claims without plans: Statements that a company "will be" carbon neutral or sustainable by a future date, without a publicly available, independently verified implementation plan with milestones
- Claims implying overall sustainability from partial assessment: Presenting a company as fully sustainable or responsible when only one product, facility, or activity has been assessed
- Claims based on EU ETS compliance: Presenting greenhouse gas emission reductions achieved through mandatory EU Emissions Trading System compliance as a voluntary environmental commitment
The prohibition on offset-based neutrality claims is the most commercially significant item on this list. Many large companies have built marketing strategies around "carbon neutral by [year]" commitments supported by carbon credit purchases. Under the GCD, this approach is categorically prohibited — the roadmap to "neutral" claims must involve actual emissions reductions, not offset purchases.
How the February 2025 Omnibus revision changes the picture
In February 2025, the European Commission proposed the "Omnibus" simplification package, which among other measures proposed significant changes to the GCD that would, if adopted:
- Exempt micro-enterprises (fewer than 10 employees, under €2 million turnover) from the GCD's substantiation and verification requirements entirely
- Extend transition periods for small and medium-sized enterprises
- Potentially simplify the pre-notification procedure for lower-risk claims
- Revise the accreditation requirements for third-party verifiers to increase market availability
As of May 2026, the Omnibus proposals are still in legislative negotiation. The GCD in its current form has not been withdrawn — the Commission's June 2025 communication signalled a pause for review rather than a formal withdrawal. Companies should track the legislative calendar closely, but should not make planning decisions based on the assumption that the GCD will be abandoned. The underlying substantiation standard — which reflects the UCPD's existing requirements, now more precisely defined — will persist in some form regardless of the final GCD text.
What companies should do now: a practical preparation framework
Waiting for the GCD to be finalised before acting is a strategic error. The UCPD already requires that environmental claims be truthful, substantiated, and non-misleading. The GCD will make that requirement more specific and procedurally structured, but it will not change the fundamental obligation. Companies that align with the GCD's substantiation standard now are simultaneously complying with the UCPD's existing requirements — which are already being enforced.
A practical preparation sequence:
- Audit your current claims portfolio. List every environmental claim made on products, packaging, advertising, and digital channels. Classify each as: (a) absolute performance claim, (b) comparative claim, (c) generic claim, or (d) future commitment. Generic claims should be earmarked for retirement or replacement with substantiated specific claims.
- Assess substantiation gaps. For each claim you intend to keep, assess whether the underlying evidence meets the GCD's standard. What methodology was used? How old is the data? Has a third party reviewed it?
- Commission PEF assessments for priority products. Start with your highest-volume or most prominently claimed products. A full PEF study typically takes 3-6 months and costs EUR 30,000-100,000 depending on product complexity. Build this into your compliance budget.
- Identify accredited verifiers. The ecosystem of GCD-accredited verifiers is still developing. Begin conversations with candidates now — early movers will have better access to verifier capacity when the GCD's application date approaches.
- Redesign claim communication. Substantiated claims under the GCD must include a QR code or equivalent linking to the SoC and assessment documentation. Packaging and digital design must accommodate this disclosure requirement.
For the enforcement landscape — what regulators are actually penalising under the UCPD in 2025-2026 while the GCD is pending — see our analysis of real EU greenwashing enforcement cases by sector.
Use the Greenwashing Checker to identify which of your environmental claims are likely to survive the GCD's Article 4 assessment — and which need to be revised or retired before enforcement begins.
Run a free greenwashing check →
Frequently Asked Questions
What does 'substantiation' mean under the EU Green Claims Directive?
Substantiation requires: (1) a scientific assessment using recognised methods (PEF or equivalent) before making the claim; (2) pre-notification to a national competent authority; (3) a Statement of Conformity from an accredited third-party verifier; and (4) the claim must match exactly what the assessment covers. Generic claims ("eco-friendly," "sustainable") cannot be substantiated and are prohibited outright under Annex I.
Is the EU Green Claims Directive still in effect in 2026?
The GCD has not yet entered into force as of 2026. It remains in legislative negotiation following the February 2025 Omnibus revision proposals. Enforcement of greenwashing rules continues under the existing EU Unfair Commercial Practices Directive (UCPD), which already prohibits misleading environmental claims and is producing real fines across EU member states.
What is a Statement of Conformity under the Green Claims Directive?
A Statement of Conformity (SoC) is issued by an accredited third-party verifier confirming that a specific environmental claim meets the GCD's substantiation requirements. It must be obtained before the claim is made, published on the company's website, and accessible via QR code on packaging. It is valid for 5 years or until there is a material change in the product or evidence base.
Can comparative environmental claims be made under the GCD?
Comparative claims ("30% lower carbon footprint than industry average") are permitted but face the strictest requirements. Both the product and benchmark must use identical methodologies, the same lifecycle scope, data from the same year, and reflect the same geographic market. A difference must be statistically significant. Vague competitive claims ("a greener choice") are prohibited under Annex I.
What environmental claims are prohibited outright under the GCD?
Annex I prohibits generic claims without substantiated performance (eco-friendly, green, sustainable, etc.), carbon offset-based neutrality claims, future commitment claims without verified plans, and claims implying overall company sustainability from partial assessment. These cannot be substantiated regardless of evidence — they must be retired or replaced with specific, verified claims.
Related: EU Green Claims Directive 2026: SME compliance checklist · Sustainable packaging claims: what to avoid in 2026 · How to spot greenwashing: 10 red flags