EU Taxonomy — Definition and Sustainability Reporting Context
“Green” had become a word anyone could use. A fund could call itself sustainable, a company could call a project environmentally friendly, and no one could easily check. In 2020 the European Union decided to fix that by doing something unusually literal: it wrote down, activity by activity, the precise conditions under which something counts as green — and made everyone use the same definitions.
The EU Taxonomy is that rulebook — a classification system for environmentally sustainable economic activities, and the anti-greenwashing backbone of European sustainable finance.
The EU Taxonomy (Regulation (EU) 2020/852) classifies which economic activities count as environmentally sustainable. An activity is Taxonomy-aligned if it substantially contributes to one of six environmental objectives, does no significant harm to the others, and meets social safeguards.
Definition — What the EU Taxonomy Is
The EU Taxonomy is Regulation (EU) 2020/852, which entered into force in July 2020. It is not a reporting standard and not a tax — it is a classification system: a common, science-based dictionary that sets out, in detail, which economic activities can be called environmentally sustainable and under what conditions. Think of it as an official “green list” with the entry requirements written down.
Its purpose is threefold: to give investors, companies, and policymakers one shared definition of “sustainable” so claims can be checked; to channel capital toward genuinely green activities; and to curb greenwashing. It is the cornerstone of the EU’s sustainable-finance framework, sitting alongside the disclosure rules of the CSRD and the fund-labelling rules of the SFDR.
The Taxonomy classifies activities, not whole companies. A firm doesn’t “comply with” the Taxonomy; it measures and reports what share of its business is Taxonomy-aligned. The emissions numbers behind the climate criteria are still calculated with the GHG Protocol — the Taxonomy sets the threshold an activity must beat, not the accounting method.
The Six Environmental Objectives
Every judgement in the Taxonomy hangs on six environmental objectives. An activity earns green status by substantially contributing to at least one — while not undermining the rest.
| # | Environmental objective |
|---|---|
| 1 | Climate change mitigation |
| 2 | Climate change adaptation |
| 3 | Sustainable use and protection of water and marine resources |
| 4 | Transition to a circular economy |
| 5 | Pollution prevention and control |
| 6 | Protection and restoration of biodiversity and ecosystems |
The detailed pass/fail thresholds for each objective — the technical screening criteria — are set out in delegated acts: the Climate Delegated Act (covering objectives 1 and 2) and the Environmental Delegated Act (objectives 3 to 6). A separate, politically contested Complementary Climate Delegated Act added specific conditions under which certain gas and nuclear activities can qualify.
How an Activity Qualifies: Substantial Contribution, DNSH, Safeguards
Being covered by the Taxonomy is not the same as passing it. To be Taxonomy-aligned, an activity must clear three conditions at once.
| Condition | What it requires |
|---|---|
| Substantial contribution | Meets the technical screening criteria for substantially contributing to at least one of the six objectives |
| Do No Significant Harm (DNSH) | Does not significantly harm any of the other five objectives |
| Minimum safeguards | Respects minimum social standards — human and labour rights, anti-corruption, fair competition, and taxation (OECD and UN guidelines) |
The technical screening criteria (TSC) in the delegated acts are what make this concrete: they define both the “substantial contribution” thresholds and the “do no significant harm” conditions for each activity — for example, a maximum emissions intensity for electricity generation. Only an activity that satisfies all three conditions counts as aligned. The full, clause-level criteria live in our EU Taxonomy Regulation reference.
What Companies Disclose: Eligible vs Aligned
Companies in scope don’t report a pass or fail; they report proportions. For each of three financial KPIs — turnover, capital expenditure (CapEx), and operating expenditure (OpEx) — a company discloses the share that is Taxonomy-eligible and, of that, the share that is Taxonomy-aligned. These KPIs are reported as part of sustainability reporting under the CSRD.
Taxonomy-eligible means an activity is described by the Taxonomy — it appears in the delegated acts and has technical screening criteria. Taxonomy-aligned means that activity has actually met those criteria (substantial contribution + DNSH + safeguards). A company can be 80% eligible but only 20% aligned. Eligibility says “this is the kind of thing the Taxonomy covers”; alignment says “and it genuinely qualifies as green.”
Where It Stands Now: The 2026 Omnibus Simplification
The most important recent development — and the thing to know about the Taxonomy in 2026 — is that it has been simplified. As part of the EU’s “Omnibus” package to reduce reporting burden, a delegated regulation (Regulation (EU) 2026/73) amending the Taxonomy disclosure, climate, and environmental delegated acts entered into force in January 2026. It introduces materiality thresholds (so companies can skip reporting on Taxonomy-immaterial activities), streamlines the reporting templates, and eases some of the DNSH criteria.
The core architecture is unchanged — six objectives, the substantial-contribution / DNSH / safeguards test, and the turnover/CapEx/OpEx KPIs all remain. What has changed is the compliance load: fewer, more material data points, aligned with the narrower CSRD scope agreed in the same reform. Any guidance describing the pre-2026 full-scope reporting is now out of date.
Common Confusions
- Confusing eligible with aligned. Eligible means the Taxonomy covers the activity; aligned means it meets the criteria. They are very different numbers.
- Thinking the Taxonomy classifies companies. It classifies activities; a company reports the share of its turnover, CapEx, and OpEx that is aligned.
- Treating it as the same thing as the CSRD. The CSRD is the disclosure regime; the Taxonomy is the classification system whose KPIs are disclosed under it.
- Forgetting the DNSH gate. Substantially contributing to one objective isn’t enough — an activity must also do no significant harm to the other five.
- Assuming “green list” means only zero-impact activities. The Taxonomy also recognises transitional and enabling activities that help decarbonise, subject to strict criteria.
- Using the old full-scope reporting rules. The 2026 Omnibus added materiality thresholds and simplified templates — check the current delegated acts.
Related Terms, Standards, and Tools
The EU Taxonomy is defined in the EU Taxonomy Regulation, its alignment KPIs are disclosed under the CSRD and ESRS, its circular-economy objective connects to ESRS E5, and its whole purpose is to replace vague greenwashing with checkable, criteria-based definitions of sustainability.
Frequently Asked Questions
The EU Taxonomy is Regulation (EU) 2020/852, a classification system that defines which economic activities count as environmentally sustainable in the European Union. It sets out, activity by activity, the conditions an activity must meet to be called “green”, so that investors and companies share one checkable definition of sustainability. Its aims are to channel capital toward sustainable activities and to prevent greenwashing. It is a cornerstone of the EU’s sustainable-finance framework, alongside the CSRD and the SFDR.
The six environmental objectives are: 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. To be Taxonomy-aligned, an activity must substantially contribute to at least one of these while doing no significant harm to the other five. The detailed thresholds for each objective are set in the Taxonomy’s delegated acts.
An economic activity is Taxonomy-aligned if it meets three conditions at once: it substantially contributes to at least one of the six environmental objectives (meeting the relevant technical screening criteria); it does no significant harm (DNSH) to any of the other objectives; and it complies with minimum social safeguards covering human and labour rights, anti-corruption, fair competition, and taxation. Only activities satisfying all three count as aligned — the precise thresholds are defined in the EU Taxonomy Regulation and its delegated acts.
Taxonomy-eligible means an activity is described by the Taxonomy — it appears in the delegated acts and has technical screening criteria defined for it. Taxonomy-aligned means that activity has actually met those criteria: substantial contribution, do no significant harm, and minimum safeguards. Eligibility is about coverage (“the Taxonomy addresses this kind of activity”); alignment is about performance (“and it genuinely qualifies as sustainable”). A company can have a high eligible share but a much smaller aligned share, which is why both are reported separately.
They are complementary parts of the EU’s sustainable-finance framework. The Taxonomy is the classification system that defines what counts as environmentally sustainable; the CSRD is the disclosure regime through which companies report. Companies in CSRD scope disclose their Taxonomy KPIs — the share of turnover, capital expenditure, and operating expenditure that is Taxonomy-eligible and Taxonomy-aligned. The 2025–26 Omnibus reform narrowed both regimes together, adding materiality thresholds and simplifying the Taxonomy reporting templates.
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