EU Taxonomy Regulation: What Counts as a Sustainable Economic Activity

Calling an activity "green" and proving it meets the EU Taxonomy's definition of environmentally sustainable are two very different things. The Taxonomy exists precisely because the first claim used to be made freely and the second almost never was — it replaces a vague, marketing-driven label with a specific, testable classification system.

What the EU Taxonomy actually does

The EU Taxonomy Regulation, in force since July 2020, is a classification system that defines which economic activities qualify as environmentally sustainable under EU law. It doesn't rate companies or funds directly — it sets criteria for individual economic activities, and companies and financial products are then assessed by how much of their activity or their investments align with those criteria. Its purpose is to give investors, companies and policymakers a common, verifiable definition of "sustainable," closing the gap that let inconsistent or self-defined green claims circulate freely before it existed.

The six environmental objectives

An activity can only be assessed against the Taxonomy by reference to one of six environmental objectives: climate change mitigation, climate change adaptation, the sustainable use and protection of water and marine resources, the transition to a circular economy, pollution prevention and control, and the protection and restoration of biodiversity and ecosystems. Most Taxonomy assessment activity so far has concentrated on the first two objectives, since the detailed technical screening criteria for those were finalised earliest; criteria for the remaining four objectives have followed on a slower timeline.

The three-part test for "sustainable"

For an economic activity to qualify as environmentally sustainable under the Taxonomy, it has to pass three distinct tests, not just one. First, it must make a substantial contribution to at least one of the six objectives, measured against detailed technical screening criteria set out in delegated legislation for that specific activity and sector. Second, it must do no significant harm to any of the other five objectives — an activity that helps with climate mitigation but seriously damages water resources doesn't qualify simply because it passes on one front. Third, it must be carried out in compliance with minimum safeguards, covering areas like human rights and labour standards. All three conditions have to be met together; none of them substitutes for the others.

Who actually has to report against it

Taxonomy reporting obligations fall on large companies and financial institutions already subject to EU non-financial reporting requirements, who must disclose what proportion of their turnover, capital expenditure and operating expenditure is Taxonomy-eligible and, further, Taxonomy-aligned. Financial market participants report similarly on the proportion of their investments that meet Taxonomy criteria. Eligibility and alignment are meaningfully different figures: eligibility just means an activity is of a type covered by the Taxonomy's criteria at all, while alignment means it has actually been assessed and shown to pass the substantial contribution, do-no-significant-harm and minimum safeguards tests. A company can report a high eligibility percentage and a much lower alignment percentage, and that gap is often the more informative number.

Where the Taxonomy is heading in 2026

The Taxonomy's technical criteria aren't static. The European Commission opened feedback in March 2026 on revising sustainability criteria for several activities, continuing a pattern of periodic delegated-act amendments — including changes made in July 2025 to the Taxonomy Disclosures, Climate, and Environmental Delegated Acts. This sits alongside the broader "Omnibus" simplification package the Commission launched in February 2025, aimed at reducing the reporting burden of EU sustainability rules generally. Practically, this means the specific percentage-reporting requirements a company worked to in one reporting year can shift by the next, and Taxonomy compliance isn't a one-off assessment to file away.

Where alignment claims most often go wrong

The most frequent error isn't a company deliberately overstating alignment — it's conflating eligibility with alignment in how figures get reported or discussed internally. An activity being "Taxonomy-eligible" says only that it's the right type of activity to potentially qualify; treating that eligibility figure as though it already represents genuine alignment, without having gone through the substantial-contribution and do-no-significant-harm assessment, is a common and avoidable misstatement.

FAQ

Is the EU Taxonomy the same as SFDR?
No. SFDR is a disclosure regime for financial products; the Taxonomy is a classification system defining which specific economic activities count as environmentally sustainable. SFDR's Article 9 products use Taxonomy criteria as part of their harm-avoidance test, but the two are separate frameworks.

What's the difference between Taxonomy-eligible and Taxonomy-aligned?
Eligible means the activity is of a type the Taxonomy's criteria cover. Aligned means it has been assessed against the substantial contribution, do-no-significant-harm and minimum safeguards tests and passed all three.

Which of the six objectives is most commonly reported against?
Climate change mitigation and climate change adaptation, since their technical screening criteria were finalised first. Criteria for the other four objectives have followed on a later timeline.

Do the Taxonomy's criteria change over time?
Yes. The Commission periodically amends the technical screening criteria through delegated acts, including changes in 2025 and further consultation opened in 2026.

The Taxonomy's value comes from making "sustainable" a testable claim rather than a marketing one, but that only holds if eligibility and alignment are reported as the genuinely different figures they are. Learnsignal's guide to IFRS S1 and S2 versus ESRS covers the disclosure standards that often reference Taxonomy-aligned data in practice. Browse our CPD courses to build ESG and sustainability reporting skills into your team's training.