When a company says an investment is green, or a bank claims its lending portfolio is aligned with the Paris Agreement, those statements only carry weight if there is a common definition of what green means. Before the EU Taxonomy existed, there was no such definition in European law. Companies and investors used different criteria, different thresholds, and different interpretations. The result was a fragmented, hard-to-compare landscape where greenwashing was structurally easy.
The EU Taxonomy Regulation, established in 2020 and entering force progressively from 2022, was built to solve that problem. It creates a single, legally defined classification system for environmentally sustainable economic activities. An activity is either taxonomy-aligned or it is not. There is no ambiguity in principle, even if the application is technically demanding.
The six environmental objectives
The Taxonomy is organised around six environmental objectives. For an economic activity to qualify as sustainable under the regulation, it must contribute substantially to at least one of these objectives while doing no significant harm to the others:
The first two objectives went live in 2022. The remaining four followed in 2024. From 2026, companies subject to CSRD must report alignment across all six objectives, not just climate.
The four conditions every activity must meet
To be classified as taxonomy-aligned, an economic activity must satisfy four conditions simultaneously. These are not soft criteria. They are technically defined, quantitatively assessed, and reported against specific key performance indicators:
Eligible versus aligned: a distinction that matters
One of the most important distinctions in Taxonomy reporting is between eligibility and alignment, and it is frequently misunderstood in practice.
Taxonomy-eligible means an activity is listed in the Taxonomy framework as having the potential to contribute to an environmental objective. It says nothing about whether the activity actually meets the criteria.
Taxonomy-aligned means the activity is eligible and has been assessed against the technical screening criteria, confirmed to make a substantial contribution, and verified to do no significant harm. Aligned is a much higher bar than eligible.
Companies report three key performance indicators against these definitions: the share of revenue, capital expenditure, and operating expenditure that comes from taxonomy-eligible and taxonomy-aligned activities. The gap between eligible and aligned figures is often large, and it is a meaningful signal of how far a company's activities genuinely meet the standard.
What the 2025 and 2026 simplifications changed
The Taxonomy has faced sustained criticism since its introduction. The technical screening criteria were widely described as overly complex, inconsistent across sectors, and operationally difficult to apply, particularly for companies whose core business is not directly listed in the Taxonomy but who still face reporting obligations through ancillary activities like owning their own buildings.
As part of the broader Omnibus simplification agenda, two significant changes came into force in early 2026:
- Materiality threshold introduced: A 10% de minimis rule now exempts companies from assessing economic activities that individually account for less than 10% of their relevant key performance indicator. A company that owns its headquarters no longer needs to assess that building against Taxonomy criteria if real estate represents less than 10% of its revenue, capital expenditure, or operating expenditure. This removes a significant compliance burden for companies whose main business has nothing to do with the activities listed in the Taxonomy.
- Simplified reporting templates: The mandated disclosure templates were shortened and restructured. Zero-value entries no longer need to be reported, reducing the volume of data companies must compile and present without changing the substance of what is being measured.
- DNSH criteria revised: Several of the Do No Significant Harm criteria, particularly around pollution prevention, were simplified and clarified. The Commission committed to a further systematic review of all technical screening criteria to improve usability and legal clarity.
In March 2026, the Commission published draft amendments to the Climate and Environmental Delegated Acts proposing further revisions to the technical screening criteria themselves, with a public feedback period running through April 2026. This is an ongoing process, not a settled one.
Why the Taxonomy matters beyond compliance
The Taxonomy is sometimes treated as a reporting burden to be managed and minimised. That framing misses the strategic dimension.
For companies, taxonomy alignment is increasingly a signal to capital markets. Investors and lenders use taxonomy KPIs to assess whether a business is genuinely positioned for the low-carbon transition or simply disclosing in the right format. A high gap between eligible and aligned revenue is a strategic signal, not just a compliance metric.
For financial institutions, the Green Asset Ratio, calculated using Taxonomy alignment data from corporate counterparties, is becoming a standard measure of portfolio sustainability. Banks and asset managers that cannot demonstrate alignment face growing pressure from both regulators and institutional investors.
The framework will continue to evolve. The technical screening criteria for all six objectives are under active review. New sectors are being added. The interplay between Taxonomy alignment and CSRD double materiality assessments is becoming closer. For anyone working in sustainability, finance, or strategy in the EU context, the Taxonomy is not a niche technical topic. It is core infrastructure for how investment decisions will increasingly be made.