EU Taxonomy Explained: A Guide for Irish Companies

The EU Taxonomy is the European Union’s classification system for determining which economic activities qualify as environmentally sustainable. It sets the rules for what counts as “green” in the EU, replacing vague sustainability claims with a science-based, legally defined framework. For Irish companies subject to the CSRD, Taxonomy reporting is not optional — it is a mandatory part of your sustainability disclosures.

What the EU Taxonomy Is

The EU Taxonomy Regulation (2020/852) entered into force in July 2020 as a core component of the EU Green Deal. Its purpose is straightforward: create a common language for what “sustainable” means in economic terms, so that investors, companies, and policymakers are all working from the same definitions.

Before the Taxonomy, any company could describe its activities as sustainable without any standardised basis. The Taxonomy eliminates this ambiguity by setting specific, science-based thresholds for each sector and activity. It does not tell companies what they must do — it classifies what they are already doing.

The challenge is that the Taxonomy is not a simple checklist. The delegated acts run to hundreds of pages of technical screening criteria, cross-referenced across six environmental objectives, dozens of NACE codes, and multiple layers of conditional requirements. Misclassifying an activity — or missing a DNSH criterion — can result in material misstatement in your CSRD report, with all the legal and reputational consequences that entails. If you are not sure how your activities map against the Taxonomy, reach out to our team — we can help you get the classification right from the start.

Taxonomy-Eligible vs Taxonomy-Aligned

Two terms are central, and the distinction between them catches many companies off guard:

• Taxonomy-eligible — the activity is described in the Taxonomy delegated acts, meaning it could potentially qualify. Eligibility is about coverage, not performance.
• Taxonomy-aligned — the activity meets all four conditions: substantial contribution, do no significant harm, minimum social safeguards, and technical screening criteria. Alignment means the activity qualifies as environmentally sustainable under EU law.

A manufacturing operation might be listed in the Taxonomy (eligible) but fail to meet the emissions thresholds (not aligned). Confusing the two — or incorrectly claiming alignment when only eligibility applies — is one of the most common and consequential errors in Taxonomy reporting.

The Six Environmental Objectives

The Taxonomy defines six environmental objectives. Every classified activity must substantially contribute to at least one:

1. Climate change mitigation — the most developed objective, covering emissions reduction, renewable energy, and energy efficiency, with the broadest set of technical screening criteria
2. Climate change adaptation — building resilience to the physical effects of climate change
3. Water and marine resources, circular economy, pollution prevention, and biodiversity — four additional objectives with criteria published in June 2023

Each objective has its own set of technical screening criteria, its own DNSH requirements relative to the other five, and its own evidence standards. Climate mitigation and adaptation are the most commonly assessed, but the addition of the remaining four objectives in 2023 significantly increased the complexity of the assessment process — particularly for companies whose activities touch multiple objectives simultaneously.

Why Taxonomy Alignment Is More Complex Than It Appears

For an activity to be classified as Taxonomy-aligned, it must satisfy all four conditions simultaneously. In practice, this means navigating multiple layers of interconnected requirements where a single oversight can invalidate the entire assessment.

1. Substantial Contribution

The activity must make a meaningful positive contribution to one of the six environmental objectives, as defined by specific quantitative thresholds in the delegated acts. These benchmarks are derived from climate science and EU policy goals — not industry averages — which means many activities that companies consider “green” may not meet the bar.

2. Do No Significant Harm (DNSH)

While substantially contributing to one objective, the activity must not significantly harm any of the other five. This is where complexity multiplies — the DNSH assessment requires evaluating your activity against five separate sets of criteria simultaneously, each with its own data requirements and technical thresholds. A single overlooked DNSH criterion invalidates the entire alignment claim.

3. Minimum Social Safeguards

The company must comply with minimum social safeguards referencing international human rights, labour, and anti-corruption standards. Many Irish companies discover that their existing policies do not fully satisfy these requirements — and the gap is not always obvious without expert assessment.

4. Technical Screening Criteria

Each activity has specific technical screening criteria — quantitative and qualitative benchmarks that are sector-specific, periodically updated, and drawn from hard scientific boundaries rather than aspirational targets. Meeting them requires granular technical data that many companies do not routinely collect, and the interaction between substantial contribution criteria and DNSH criteria for the same activity creates layered evidence requirements that compound quickly across a portfolio of activities. If you are struggling to source the right data for your sector’s criteria, we can help — this is technical work that benefits from specialist support.

Who Needs to Report

Taxonomy reporting is required for two groups:

Companies Subject to CSRD

All companies within scope of the Corporate Sustainability Reporting Directive must include Taxonomy disclosures in their sustainability reports. For Irish companies, this means:

• Companies already subject to the NFRD from the 2025 reporting year
• Large companies meeting the revised Omnibus thresholds — 1,000+ employees and EUR 450m+ net turnover — from FY 2027 (the Omnibus Directive, adopted February 2026, raised these from the original 250+ employees / EUR 50m+ revenue and delayed Phase 2 by two years)
• Listed SMEs from the 2028 reporting year

Financial Market Participants

Banks, insurers, asset managers, and investment firms must disclose how their portfolios align with the Taxonomy. If your company is in a fund portfolio or applying for green finance, your Taxonomy alignment matters to your financial counterparties — and inaccurate reporting can jeopardise access to sustainable finance instruments.

What to Report — and Why Getting It Right Matters

Companies must report three KPIs — turnover, capital expenditure (CapEx), and operating expenditure (OpEx) — each broken down by Taxonomy eligibility and alignment. The CapEx KPI is particularly important: even if your current turnover is not Taxonomy-aligned, reporting CapEx toward alignment demonstrates a credible transition pathway that investors and lenders increasingly value.

What makes KPI calculation difficult is the allocation logic. Every euro must be mapped to a specific economic activity, assigned to the correct classification, and assessed for both eligibility and alignment — without double-counting. This requires sustainability, finance, and operations teams to work in lockstep, using consistent activity definitions and data sources. The interdependencies between your financial reporting structure, your activity classifications, and your technical screening assessments create a coordination challenge that most companies significantly underestimate. Talk to our team if you want to get the financial mapping right before your first reporting cycle.

EU Taxonomy and CSRD

The Taxonomy and CSRD are designed to work together. CSRD provides the reporting framework; the Taxonomy provides the classification system for environmental sustainability.

The double materiality assessment required by CSRD determines which ESRS topics are reportable, but Taxonomy disclosures under ESRS 2 (General Disclosures) are mandatory for all in-scope companies regardless of materiality.

The Taxonomy also connects to the Sustainable Finance Disclosure Regulation (SFDR), which requires financial products marketed as sustainable to disclose their Taxonomy alignment. For Irish companies navigating both CSRD reporting and the EU Green Deal landscape, treating the Taxonomy as part of your integrated compliance strategy — rather than a separate exercise — saves significant time and cost. But the integration challenge is substantial: the Taxonomy’s activity-level classification must map coherently to your ESRS disclosures, your financial reporting structure, and your carbon accounting methodology — and misalignment between any of these creates inconsistencies that auditors will flag. Getting this architecture right from the start is where specialist guidance pays for itself.

The Risks of Getting Taxonomy Reporting Wrong

Taxonomy reporting is subject to the same assurance requirements as other CSRD content. Errors are not just embarrassing — they carry material consequences:

• Regulatory risk — misstatement in Taxonomy disclosures can be treated as non-compliance with CSRD, triggering enforcement action from national competent authorities
• Greenwashing risk — overstating Taxonomy alignment is a form of greenwashing with legal implications under the EU’s Green Claims Directive
• Investor risk — financial market participants rely on Taxonomy KPIs for investment decisions and SFDR disclosures. Inaccurate data erodes investor confidence
• Audit risk — assurance providers are scrutinising Taxonomy disclosures closely, and restatements damage credibility

The technical screening criteria are updated periodically as climate science evolves and EU policy tightens. What was aligned this year may not be next year. Maintaining alignment requires ongoing monitoring and reassessment — not a one-off exercise.

How Clearscope Helps

The EU Taxonomy is one of the most technically demanding elements of the EU’s sustainability reporting framework. It sits at the intersection of climate science, EU regulatory law, financial reporting, and sector-specific technical standards — and getting it right requires expertise across all four domains.

We work with Irish businesses through every stage of Taxonomy assessment and reporting:

• Activity screening and classification — mapping your operations against the Taxonomy delegated acts, correctly identifying which NACE codes apply, and distinguishing between eligibility and alignment for each activity
• Technical criteria assessment — evaluating substantial contribution and DNSH compliance against the specific quantitative thresholds for your sector, including sourcing and interpreting the technical data required
• Minimum safeguards review — assessing your human rights due diligence, anti-corruption, and labour rights policies against Article 18 requirements and identifying gaps
• KPI calculation and financial mapping — working with your finance team to correctly allocate turnover, CapEx, and OpEx to Taxonomy activities without double-counting or misallocation
• CSRD integration — ensuring your Taxonomy disclosures are consistent with your broader ESRS reporting, carbon accounting data, and double materiality assessment
• Assurance preparation — documenting your screening methodology, data sources, and alignment judgements to meet auditor expectations and withstand scrutiny
• Ongoing monitoring — tracking updates to delegated acts and technical screening criteria so your assessments remain current as the regulatory framework evolves

Building your Taxonomy assessment capability now positions your business ahead of both regulatory requirements and market expectations — but doing it properly requires the right expertise from the start.

Contact us to discuss your EU Taxonomy readiness.

Frequently Asked Questions

What is the EU Taxonomy?

The EU Taxonomy is a classification system that defines which economic activities qualify as environmentally sustainable, using science-based technical screening criteria across six environmental objectives.

Does the EU Taxonomy apply to Irish companies?

Yes. Irish companies subject to CSRD must include Taxonomy disclosures in their sustainability reports. Financial market participants also have separate Taxonomy disclosure obligations.

What is the difference between Taxonomy-eligible and Taxonomy-aligned?

Taxonomy-eligible means your activity is covered by the classification system. Taxonomy-aligned means it meets all four conditions — substantial contribution, do no significant harm, minimum social safeguards, and technical screening criteria. Eligibility is about coverage; alignment is about performance.

What do companies need to report under the EU Taxonomy?

Companies must report three KPIs — the proportion of turnover, CapEx, and OpEx that is Taxonomy-eligible and Taxonomy-aligned. The allocation and mapping required to calculate these accurately is one of the most technically demanding aspects of Taxonomy reporting.

How does the EU Taxonomy connect to CSRD?

CSRD requires all in-scope companies to include Taxonomy disclosures — they are mandatory under ESRS 2 regardless of your double materiality assessment. The two frameworks must be carefully integrated to ensure consistent reporting.