The slide deck your investor relations team built last year claimed "58% of our revenue is Taxonomy-eligible." The CFO loved it. The number went into an ESG roadshow. Then the actual alignment assessment came back and the aligned figure — the one that actually counts for Article 8 disclosure — was 19%.
Nobody was lying. They just didn't know the difference between eligible and aligned, and neither did most of their peers. The 58% referenced activities on the EU Taxonomy list. The 19% was what survived the Do No Significant Harm checks, the substantial contribution thresholds, and the minimum safeguards review.
That gap — between what counts on paper and what counts in the KPI table — is where most of the Taxonomy work actually lives.
What the Taxonomy is, in two sentences
The EU Taxonomy (Regulation 2020/852) is a classification system that defines which economic activities are "environmentally sustainable" under EU law. If you're a large company or a financial market participant subject to CSRD, you have to report how much of your Turnover, CapEx, and OpEx is aligned with this classification under the Article 8 Delegated Act.
It exists because Brussels got tired of watching €100bn in ESG funds buy shares of oil majors and call it green. The Taxonomy is the EU's attempt to define "sustainable" with enough precision that you can audit it. Whether it succeeded is a separate question — but the definition is now a legal obligation, not a marketing choice.
Who actually has to do this
Any large EU company in CSRD scope is on the hook: more than 250 employees, more than €50m turnover, or more than €25m balance sheet (two out of three). Listed SMEs get a lighter version starting FY2026, with a further delay under the February 2025 Omnibus carveouts. Non-EU parents with large EU subsidiaries get pulled in through the CSRD consolidation rules.
Financial institutions have their own set of headaches — the Green Asset Ratio for banks, the Taxonomy-alignment KPI for asset managers under SFDR. Those are different disclosures with different denominators, but the underlying logic is the same three-step test.
The confusing edge cases are the ones nobody briefs you on. A real-estate company renovating an office to near-zero-energy standard: the renovation is CapEx-aligned, the rental income is Turnover-aligned, but only if the building's Energy Performance Certificate is in the top 15% of the national stock. A manufacturer of wind turbine gearboxes: clearly aligned with climate mitigation. A manufacturer of bearings that might end up in wind turbines: not aligned, because the activity is classified by what you make, not where it ends up. A food company with a vegetarian product line: not aligned, because vegetarian food is not a listed activity. Read that sentence again before you spend three weeks trying to make it one.
The three-step logic nobody explains cleanly
Every Taxonomy assessment, for every activity, runs through the same three gates. If you understand these three gates, you understand 80% of the framework.
Step 1: Eligibility. Is this activity on the EU Taxonomy list? The list is split across the six Delegated Acts covering the six environmental objectives. Activity 4.1 is solar PV generation. Activity 3.6 is the manufacture of other low-carbon technologies. Activity 7.7 is the acquisition and ownership of buildings. If your activity doesn't match a listed code, you stop here — it's non-eligible, which means zero alignment contribution. Roughly 40% of most companies' P&L lands here on the first pass, and that's normal.
Step 2: Alignment. For each eligible activity, does it pass all three of the following tests? (a) Substantial Contribution criteria — the activity-specific technical thresholds (e.g., for cement manufacture, clinker emissions below 0.722 tCO2/t). (b) Do No Significant Harm (DNSH) — six checks, one per environmental objective, that the activity doesn't make any other objective worse. (c) Minimum Safeguards — alignment with the OECD Guidelines for Multinational Enterprises and the UN Guiding Principles on Business and Human Rights. Miss any one of these and the activity is eligible-but-not-aligned.
Step 3: Reporting. Calculate the three KPIs: the share of your Turnover, CapEx, and OpEx that flows from aligned activities. Publish them in your sustainability statement under ESRS 2 and the Article 8 Delegated Act. Include the numerator, the denominator, and the disaggregation by environmental objective.
That's the whole framework. Most of the work — and most of the pain — sits inside Step 2.
The six environmental objectives
The Taxonomy has six environmental objectives, each with its own Delegated Act and its own technical screening criteria:
Climate change mitigation. The one everybody knows. Activities that reduce or avoid GHG emissions. This is where solar PV, wind, green hydrogen, and low-carbon cement sit.
Climate change adaptation. Less obvious. Activities that increase the resilience of assets or systems to climate risk. Think flood-defence infrastructure, or an agricultural operation that has done a climate risk assessment and implemented adaptation measures. Lots of companies miss that their existing operations can qualify here through adaptation investment.
Sustainable use and protection of water and marine resources. Water supply, wastewater treatment, flood protection. Narrower scope than you'd think — a textile manufacturer that cut water intensity by 40% doesn't qualify, because the activity "textile manufacture" isn't listed under this objective.
Transition to a circular economy. Recycling, remanufacturing, product-as-a-service models, repair. This is the newest and least-tested of the objectives. The technical criteria are looser, which means more interpretation, which means more auditor disagreement.
Pollution prevention and control. Clean-air technologies, wastewater treatment beyond what's covered under water, remediation of contaminated sites.
Protection and restoration of biodiversity and ecosystems. The smallest of the six by number of listed activities, and the hardest to document. Ecosystem restoration, sustainable forestry, certain tourism activities.
For each eligible activity, you pick a primary objective to report substantial contribution against, and you have to pass DNSH against the other five. You can report substantial contribution against more than one objective for the same activity, but you can't double-count the revenue.
The part nobody tells you
Here's what the consulting pitch deck leaves out.
The alignment number is almost always much lower than the eligibility number. Talk to any Wave 1 reporter who has been through two cycles. Eligibility numbers in the 40-70% range are common. Aligned numbers in the 15-30% range are common. The gap is DNSH, almost every time. A real industrial with 55% eligible revenue typically ends up at 18-22% aligned. If someone is quoting you a 50%+ aligned figure on first assessment, they're either in a very narrow sector (pure-play renewables, pure-play public transport) or they're counting something they shouldn't be. Reset expectations with the board before the first number lands.
DNSH is where the work actually is. Substantial contribution is a number — you either clear the threshold or you don't. DNSH is six qualitative checks per activity, each requiring evidence. For a cement plant to pass climate adaptation DNSH, you need a documented climate risk and vulnerability assessment for that specific site, using at least two IPCC scenarios, at two time horizons (short- and medium-term), with adaptation measures identified. For water DNSH, you need site-level water stress data against a baseline like WRI Aqueduct, plus a water management plan if the site is in a water-stressed area. For circular economy DNSH, you need a waste management plan and, for manufacturing activities, design-for-durability and repairability documentation. Multiply this by every site, for every eligible activity. This is the part where the €50K quote starts to make sense to people who haven't seen the checklist yet.
Minimum safeguards is where auditors are still figuring out what they're doing. The legal text says the company must have processes in place to align with the OECD MNE Guidelines and the UN Guiding Principles on Business and Human Rights — essentially, a human-rights due diligence regime, a governance structure, a grievance mechanism, and no final adverse court rulings on specified topics. The Platform on Sustainable Finance issued guidance in October 2022, but it left most of the implementation questions open. As of this year, different auditors are testing this against wildly different evidence bars. Some will accept your Code of Conduct plus a supplier questionnaire. Others want the full OECD 6-step due diligence framework documented with records. If you are a first-time filer, ask your auditor what their minimum-safeguards test looks like before you build the file. Otherwise, you'll build the wrong one.
The three KPIs don't always move in the same direction. Turnover-alignment is backward-looking: revenue from already-deployed aligned assets. CapEx-alignment is forward-looking: investments in aligned activities or in aligned CapEx plans. OpEx is the narrowest — only specific categories count (R&D, short-term lease, maintenance and repair related to aligned activities). An oil and gas company might have 2% aligned Turnover, 25% aligned CapEx (the transition investments), and 4% aligned OpEx. A pure-play wind developer might be 100%/100%/100%. Investors increasingly look at the CapEx number as the directional signal. Make sure your CapEx plan is tagged at the project level, not rolled up — you'll need the detail.
The numerator is the easy part. The denominator is where you get caught. For Turnover, the denominator is net turnover per IAS 1. For CapEx, it's additions to tangible and intangible fixed assets per IAS 16, 38, and IFRS 16. For OpEx, it's the sum of direct non-capitalised costs that fit the Delegated Act's narrow list. Getting the denominator wrong — especially the CapEx one — is one of the most common findings in early assurance reviews, because finance teams pull from the management-accounts view rather than the statutory view.
Timeline and deadlines
The Taxonomy is already live for the largest companies. Here's where the dates currently sit:
- FY2021: First disclosure year. Large public-interest entities reported eligibility only.
- FY2022: Large public-interest entities started reporting alignment against the two climate objectives.
- FY2023: Eligibility reporting extended to the other four environmental objectives.
- FY2024: Alignment reporting extended to all six objectives for large PIEs.
- FY2025: Full Taxonomy reporting for all large undertakings in CSRD scope (Wave 2 companies, reported in 2026).
- FY2026 onward: Listed SMEs brought in, subject to the Omnibus carveouts that were moving through the co-legislators as of early 2026.
The Commission's February 2025 Omnibus proposal suggested raising the employee threshold and narrowing which companies are in scope. As of today (2026-04-18), the final text is still being negotiated. If you are a mid-cap that was told last year you're Wave 2, check the current scope before you sign another SoW — you may have a year or two of breathing room, or you may not.
How Formist helps
Formist is an AI-powered compliance platform built by WeCarbon. It behaves like a colleague who has read the six Delegated Acts and actually remembers them. For Taxonomy work specifically, the workflow looks like this:
You upload your chart of accounts, your CapEx register, and your revenue breakdown by business line or segment. Formist reads the descriptions — in English, French, German, Italian, Polish — and proposes a mapping from each line to the Taxonomy activity codes. For each eligible activity it identifies, it walks you through the substantial contribution criteria and the six DNSH checks as structured cards, with the exact text of the technical criterion quoted inline and a citation back to the Delegated Act article. When a DNSH check needs site-level evidence — a climate risk assessment, a water management plan, an energy performance certificate — you upload the document and Formist extracts the data points, flags whether they clear the threshold, and records the source.
Minimum safeguards gets its own workstream: a checklist of the OECD 6-step due diligence, the UN Guiding Principles on Business and Human Rights, and the Platform on Sustainable Finance guidance. You upload your Code of Conduct, grievance mechanism records, and supplier due diligence policy; Formist tags what's covered and flags the gaps. At the end, it computes the three KPIs against the correct IAS/IFRS denominators and produces the Article 8 disclosure tables plus the machine-readable XBRL extension.
What it doesn't do: make the judgment calls. If your CapEx line is ambiguous between two activity codes, Formist shows you both options with the relevant criteria and asks. If your auditor has a strict view on minimum safeguards evidence, Formist doesn't argue with them — but it gives you a file that stands up to the strict view, not the lenient one.
The time-on-task for a mid-cap first-year Taxonomy assessment tends to land around two to three person-weeks with Formist, versus two to three person-months with a consultant-led engagement. The accuracy difference isn't that Formist is smarter — it's that every field is linked to a source document, so the assurance walkthrough goes from "let me find that email" to "here's the PDF, page 4."
The closing point
The EU Taxonomy is not intellectually hard. It's three steps, six objectives, and three KPIs. What makes it expensive is volume — hundreds of activity-objective-DNSH combinations, each with its own evidence requirement, each needing a citation, each needing to survive an auditor's walkthrough. That's clerical work at industrial scale, which is exactly the kind of work that should not be billed at €220 an hour.
Pay real expertise for the judgment calls: the ambiguous activity classifications, the contested DNSH interpretations, the minimum-safeguards audit defence. Automate the rest. The difference between a €50,000 quote and a €5,000 subscription is not the quality of the thinking. It's how many juniors the firm needs to keep billable while the thinking gets done.
Formist is built by WeCarbon, a climate tech company with offices in Paris, Shanghai, and Dubai. It handles EU Taxonomy, CSRD/ESRS, CBAM, GHG Protocol, CDP, ISSB, SBTi, and 15+ other sustainability frameworks from a single workspace.