The EU Taxonomy is the European Union's binding classification system under Regulation (EU) 2020/852 that determines when a specific economic activity counts as environmentally sustainable. Alignment requires passing four tests: substantial contribution to an environmental objective, do no significant harm to the others, compliance with minimum safeguards, and adherence to technical screening criteria. Investors, in-scope companies, and regulators use it as the common reference point for green capital allocation and disclosure.
TL;DR:
- Most organizations struggle with distinguishing eligibility from full alignment, often overreportting green credentials by conflating the two metrics.
- The technical screening criteria are sector-specific, frequently revised, and critical for accurate disclosure, with eligibility based on inclusion in delegated acts and alignment requiring passing four tests.
- Disclosures are mandatory for non-financial companies since January 2023, focusing on the proportion of revenue, capital, and operating costs linked to Taxonomy-aligned activities.
- The average Green Asset Ratio among a sample of credit institutions is just 2%, highlighting significant data access and reporting challenges.
- Building expertise in carbon accounting, assurance, and IFRS mapping enhances reporting quality and reduces labor-intensive retrofitting efforts.
Table of Contents
- What the EU Taxonomy Is and Why It Exists
- How the Four-Part Alignment Test Works
- Who Must Report and What the KPIs Measure
- Where to Find the Technical Screening Criteria
- A Practical Roadmap for Taxonomy Reporting
- Why Training Improves Taxonomy Disclosure Quality
- Our Take: Treat the Taxonomy as Evidence, Not a Verdict
- Building the Skills Your Taxonomy Reporting Needs
- FAQ
- Sources
What the EU Taxonomy Is and Why It Exists
Regulation (EU) 2020/852 sits at the center of the European Green Deal's financing architecture. Policymakers built the Taxonomy to solve a specific problem: without a shared definition of "green," capital markets had no reliable way to compare environmental claims across companies, sectors, or countries. The Regulation fixes that by defining six environmental objectives that any qualifying activity must support:
- Climate change mitigation
- Climate change adaptation
- Sustainable use and protection of water and marine resources
- Transition to a circular economy
- Pollution prevention and control
- Protection and restoration of biodiversity and ecosystems
The Taxonomy does not operate alone. It feeds the metrics that the Sustainable Finance Disclosure Regulation (SFDR) uses to classify investment products, it supplies the KPIs that the Corporate Sustainability Reporting Directive (CSRD) requires in-scope companies to disclose, and it anchors eligibility criteria for the EU Green Bond Standard. A bond labeled under that standard, for instance, must direct proceeds toward Taxonomy-aligned activities, which makes the classification system the common language across disclosure, investment screening, and green bond frameworks rather than a standalone compliance exercise.
How the Four-Part Alignment Test Works
An activity does not become "Taxonomy-aligned" just by appearing on a list. It must clear four distinct tests, and most implementation friction comes from treating them as a single checkbox rather than four separate hurdles.
- Substantial contribution: the activity must meaningfully advance at least one of the six objectives, such as a renewable energy installation contributing to climate mitigation or a building retrofit improving energy efficiency.
- Do No Significant Harm (DNSH): the same activity cannot materially undermine any of the other five objectives. A biomass energy project might support climate mitigation while raising DNSH questions around biodiversity or water use.
- Minimum safeguards: the undertaking must meet baseline social protections, including alignment with OECD guidelines and UN Guiding Principles on human rights and labor.
- Technical screening criteria (TSC): detailed, often quantitative thresholds set out in the delegated acts that define exactly how "substantial" and "no significant harm" are measured for each activity.
The TSC are where most of the reporting complexity lives, since they vary by sector and are periodically revised. This is also where the distinction between eligible and aligned activities matters most: eligibility simply means an activity appears in the delegated acts' sector list, while alignment means it has passed every test above, TSC included. Many first-time disclosures overstate green credentials by reporting eligibility figures as if they were alignment figures.
Pro Tip: Keep eligibility and alignment figures in separate columns in your working papers; conflating them is the single most common error assurance providers flag.
Who Must Report and What the KPIs Measure
Non-financial undertakings in scope of CSRD (and previously NFRD) have been required to disclose Taxonomy KPIs since January 1, 2023: the proportion of turnover, capital expenditure (CapEx), and operating expenditure (OpEx) tied to Taxonomy-eligible and Taxonomy-aligned activities, as set out in the Disclosures Delegated Act. Financial undertakings face separate timelines and additional counterparty-level disclosure rules.
- Turnover KPI: the share of net revenue generated by Taxonomy-aligned activities.
- CapEx KPI: the share of capital spending directed toward aligning or already-aligned activities.
- OpEx KPI: the share of operating costs, such as maintenance and short-term leases, linked to aligned activities.
- Green Asset Ratio (GAR): for credit institutions, the proportion of assets financing Taxonomy-aligned activities relative to total covered assets.
A sample of 97 credit institutions showed an average turnover- and CapEx-based GAR of just 2%, with national averages ranging from 0% to 13%, according to Platform on Sustainable Finance analysis. That gap reflects real data access problems: missing investee disclosures, counterparties that are not yet in scope, and the need for documented estimation models where primary data is unavailable.
Where to Find the Technical Screening Criteria
The technical detail behind alignment lives in a set of delegated and implementing acts, each covering a different slice of the framework:
- Climate Delegated Act: TSC for climate mitigation and adaptation activities, applied since January 1, 2022.
- Environmental Delegated Act: TSC for the remaining four environmental objectives, applied since January 1, 2024.
- Complementary Climate Delegated Act: criteria for gas and nuclear activities under strict conditions, applied since January 2023.
- Disclosures Delegated Act: methodology and templates for the turnover, CapEx, OpEx, and GAR KPIs.
The Commission maintains the Taxonomy Navigator and Compass as the practical entry point for locating which TSC apply to a given activity, alongside the Official Journal entries that carry legal force. Tracking amendments matters here: the Platform on Sustainable Finance continues to publish consultation responses and simplification proposals, and the European Supervisory Authorities periodically weigh in on disclosure templates, so criteria that applied last reporting cycle are not guaranteed to be identical this one.
A Practical Roadmap for Taxonomy Reporting
Turning the framework into a working disclosure process follows a fairly consistent sequence across organizations, regardless of sector.
- Map eligible activities against the current delegated acts to identify which revenue lines, capital projects, and operating costs are even candidates for alignment.
- Gather evidence against each TSC and DNSH criterion, including permits, energy performance certificates, and emissions data.
- Apply estimation models where investee or supply chain data is genuinely unavailable, using Platform-recommended proxies rather than ad hoc assumptions.
- Assemble the turnover, CapEx, and OpEx KPIs (or GAR, for financial undertakings) into the disclosure templates set by the Disclosures Delegated Act.
- Prepare for assurance by keeping eligibility and alignment evidence auditable and separated at the activity level, not the entity level.
Two pitfalls recur often enough to flag directly: treating a whole company as "aligned" because one division passes the test, and over-weighting the OpEx KPI, which the Platform has noted correlates heavily with turnover and CapEx and often adds little independent signal.
Pro Tip: Build your evidence file activity by activity from the start; retrofitting entity-level reporting into activity-level evidence after the fact is far more labor-intensive than doing it right the first time.
Why Training Improves Taxonomy Disclosure Quality
Accurate Taxonomy reporting depends on skills that sit between accounting, engineering, and regulatory interpretation: carbon accounting to quantify emissions baselines, IFRS S1/S2 and ESRS mapping to align global and EU frameworks, and double materiality assessment to connect financial and impact reporting, which GreenLearn offers through its sector-specific green skills and continuing education. We offer certifications that map to these needs, from carbon accounting through climate and sustainability assurance, designed to align with current regulatory expectations. Reporting teams and auditors preparing Taxonomy disclosures benefit most from structured training in evidence documentation and estimation methodology, the two areas where assurance findings concentrate.
Our Take: Treat the Taxonomy as Evidence, Not a Verdict
The Taxonomy tells you what an activity does, not whether a company is sustainable overall. Treat alignment figures as one input into governance and transition planning, invest early in data readiness and transparent estimation rules, and expect the criteria to keep shifting through 2026 and beyond.
— Ransford
Building the Skills Your Taxonomy Reporting Needs
Taxonomy disclosure rewards teams that already know carbon accounting, assurance standards, and IFRS S1/S2 mapping cold, and building that capability in-house is often faster than outsourcing it entirely. Our Certificate in Carbon Accounting and Certificate in Climate, Sustainability and ESG Assurance map directly to the evidence-gathering and assurance-readiness steps covered above.
- Certificate in Sustainability Reporting: $149 one-off, for teams assembling turnover, CapEx, and OpEx KPIs.
- Mastering IFRS S1 & S2 Sustainability Reporting: $129 one-off, for aligning global and EU disclosure requirements.
- All-Access CPD Pass: $599 per year, for reporting teams needing ongoing coverage across multiple frameworks.
Visit our course catalog to find the pathway that matches where your Taxonomy reporting program stands today.
This article is general information, not a substitute for advice from a qualified financial advisor. Consult a qualified financial professional about your own circumstances before acting on anything here.
FAQ
Is EU Taxonomy Reporting Mandatory?
Yes, for companies in scope of CSRD (and previously NFRD): non-financial undertakings have been required to disclose Taxonomy KPIs since January 1, 2023, under the Disclosures Delegated Act. Financial undertakings, including banks reporting the Green Asset Ratio, follow separate but equally binding timelines.
What Changes to the EU Taxonomy Are Expected in 2026?
The Platform on Sustainable Finance has recommended targeted simplifications, including revisions to the Disclosures Delegated Act and a more flexible approach to the GAR and OpEx KPI, aimed at cutting reporting burden while preserving the framework's rigor. Exact amendments depend on Commission adoption and Official Journal publication, so confirm the current text before relying on any specific threshold.
What Is the Difference Between Taxonomy-Eligible and Taxonomy-Aligned?
An activity is eligible if it appears in the sector lists set out in the delegated acts, regardless of performance. It becomes aligned only once it passes the full four-part test, substantial contribution, DNSH, minimum safeguards, and technical screening criteria.
What Are the Main KPIs Companies Must Disclose?
Non-financial undertakings disclose three KPIs: the share of turnover, CapEx, and OpEx associated with Taxonomy-aligned activities. Credit institutions report the Green Asset Ratio, which measures the proportion of covered assets financing aligned activities.
Sources
- EU taxonomy for sustainable activities - Finance
- Official legal texts and guidance on CSRD/Taxonomy disclosures (EUR-Lex)