ESRS XBRL Taxonomy: Digital Tagging Before the Mandate

On 17 September 2026, EFRAG released the draft ESRS XBRL taxonomy for the revised ESRS and opened a public consultation that runs until 11 November 2026. The taxonomy is the technical structure that will let a sustainability statement prepared under the revised European Sustainability Reporting Standards be produced in a machine-readable form. EFRAG plans to hand the finalised taxonomy to ESMA and the European Commission by the end of 2026.

For a reporting officer inside a CSRD-in-scope company, the important qualifier sits at the end of EFRAG’s announcement: digital tagging of ESRS disclosures is not yet mandatory. The regulatory framework that would compel tagging still has to be established by ESMA and the Commission, through technical standards that amend the electronic reporting rules. The draft taxonomy is a consultation deliverable, so this is the moment to test how your sustainability data model lines up with the tags EFRAG has proposed, before any obligation crystallises.

The gap between a released taxonomy and a mandatory one is where the useful work sits. EFRAG says the consultation is particularly relevant to software vendors, XBRL specialists and digital reporting experts, yet the company that files the tagged statement is the one that will live with any concept that does not match how it actually structures a disclosure.

Related reading: EFRAG’s 2026 draft ESRS datapoints list, the companion deliverable that was prepared in parallel with the taxonomy.

The consultation calendar and what closes when

The topic was picked because a clock is running, and two separate clocks are easy to confuse. EFRAG published the draft List of Datapoints for the revised ESRS on 28 August 2026 and released the draft XBRL taxonomy on 17 September 2026. The Draft XBRL Taxonomy was prepared in parallel and in line with the new Draft List of ESRS Datapoints, but the two deliverables have different consultation mechanics.

• 28 August 2026: draft List of Datapoints for the revised ESRS published as EFRAG Secretariat supporting material.
• 23 October 2026: deadline for comments on the draft List of Datapoints, run as a fatal-flaw survey.
• 17 September 2026: draft ESRS XBRL taxonomy and supporting materials, including the Explanatory Note, released for public consultation.
• 11 November 2026: deadline for feedback on the draft XBRL taxonomy.
• By the end of 2026: EFRAG intends to submit the finalised XBRL taxonomy to ESMA and the European Commission.

After EFRAG’s handover, ESMA must develop the applicable digital-marking requirements for an amendment to Delegated Regulation (EU) 2019/815, and the Commission must adopt the resulting amendment before mandatory sustainability tagging applies. ESMA had already consulted on proposed sustainability-tagging rules in 2024-2025, but its May 2026 enforcement report states that development of the sustainability digital requirements was put on hold while it assessed the Omnibus changes, revised ESRS, Article 8 disclosures and related taxonomies. No mandatory sustainability-tagging application date is currently set.

Read the bullets above as a correction of a common assumption. Releasing a taxonomy opens the technical review that has to happen before any tagging obligation can exist; it does not itself create that obligation. The Commission adopted the amending delegated act for the revised ESRS on 3 July 2026, but the revised ESRS are not yet legally effective: EFRAG states that legal effect follows publication in the Official Journal after completion of the scrutiny period. The Commission-adopted act provides mandatory application for financial years beginning on or after 1 January 2027 and permits application for financial years beginning in 2026 under its transitional provisions once the act is in force.

What the draft ESRS XBRL taxonomy actually is

The revised ESRS structure disclosure requirements into one or more distinct datapoints representing prescribed information, subject to the ESRS materiality rules and any applicable reliefs or phase-ins. The XBRL taxonomy is the dictionary that gives each of those pieces a machine-readable identity. In the taxonomy, each datapoint is represented as an XBRL element, which the standard calls a concept. A report tagged against the taxonomy attaches those concepts to the values in the sustainability statement, so that software can read a disclosure the same way across every filer.

EFRAG states that the Draft XBRL Taxonomy was prepared in line with the new Draft List of ESRS Datapoints. The List is meant to be read by humans and helps preparers navigate the standards and run a data-gap analysis. The taxonomy is mainly designed to produce machine-readable digital reports, so several technical details live only in the taxonomy version. Both were prepared on the basis of the revised ESRS delegated act published by the Commission on 3 July 2026.

One structural point matters for anyone scoping a tagging project. The taxonomy does not reopen the content of the standards. EFRAG built it to reflect the adopted text, so the consultation asks whether the taxonomy faithfully represents the revised ESRS and gives an effective basis for digital reporting. A policy objection to a datapoint itself belongs to the standards process, and the taxonomy consultation cannot resolve it.

Where digital tagging sits in the CSRD and ESEF chain

The obligation to digitise sustainability information comes from the Corporate Sustainability Reporting Directive, Directive (EU) 2022/2464, which amended the Accounting Directive and required sustainability statements to be prepared in a digital format. The mechanism for that digitisation is the European Single Electronic Format, ESEF, set out in Commission Delegated Regulation (EU) 2019/815. ESEF already governs how issuers prepare their annual financial reports: issuers prepare the entire annual financial report in XHTML, and where the report includes IFRS consolidated financial statements those statements are marked up in XBRL, with the markups embedded in the XHTML report using Inline XBRL.

At EU Directive level, Article 29d requires undertakings subject to Articles 19a and 29a to prepare their management report or consolidated management report in the electronic format specified in Article 3 of Delegated Regulation (EU) 2019/815 and, once marking-up rules are adopted, to mark up their sustainability reporting. The ‘annual financial report’ framing applies specifically to issuers subject to the Transparency Directive and is not the filing container for every CSRD reporter. Directive (EU) 2026/470 expressly provides that undertakings are not required to mark up sustainability reporting until the relevant marking-up rules are adopted. ESMA stated in May 2026 that development of the sustainability digital requirements had been put on hold while it assessed the Omnibus changes, revised ESRS, Article 8 disclosures and related taxonomies.

For context on the format side, ESMA continues to maintain the financial-reporting taxonomy under ESEF, as covered in ESMA’s 2026 ESEF taxonomy update. The sustainability taxonomy will sit alongside that existing architecture.

How a disclosure requirement becomes a datapoint becomes a tag

EFRAG’s Explanatory Note is worth reading for anyone who has to map an internal reporting model onto the taxonomy, because it shows how the datapoints were derived. A datapoint is a clearly separable and specific piece of information required by an ESRS disclosure requirement, generally identified at the level of a paragraph or subparagraph. The word “shall” is the flag: throughout the revised ESRS it marks the information an undertaking must include, usually in phrases such as “shall disclose”, “shall describe” or “shall explain”.

EFRAG states that the 2026 Draft List of Datapoints categorises datapoints using distinct data types. The exact data-type definitions and technical modelling assigned in the 2026 XBRL taxonomy should be taken from the published taxonomy package and its Explanatory Note.

ESRS 2 BP-1 paragraph 5 requires an undertaking to state that its sustainability statement has been prepared in accordance with the ESRS applicable at the end of the reporting period. Any controlled enumeration values and validation behaviour applied to that disclosure should be taken from the published 2026 taxonomy package and the eventual binding marking-up rules rather than inferred from ESRS 2 itself.

Materiality still decides what gets tagged

A recurring misreading of any datapoint list is that it functions as a checklist to be completed line by line. EFRAG is explicit that it does not. The draft List of Datapoints is non-authoritative supporting material issued by the EFRAG Secretariat; it must not be used to substitute the revised ESRS, and it should be used only alongside the materiality judgement that underpins ESRS reporting.

ESRS 1 paragraph 24 governs what is disclosed: subject to its stated exception for supplementary information under section 8.2, an undertaking shall not disclose information prescribed by an ESRS disclosure requirement or datapoint if that information is not material. That disclosure rule does not yet determine how the future mandatory tagging regime will represent omitted or non-material information. The marking-up rules still have to be established through Delegated Regulation (EU) 2019/815, so a tagging build should not assume that every non-material datapoint will simply be absent or that nil or other technical representations will never be used. The applicable phase-in provisions may also affect which disclosures are reportable for particular undertakings and periods.

What changed since the 2024 taxonomy

The draft taxonomy is the revised-ESRS successor to the ESRS Set 1 taxonomy EFRAG released in August 2024. The 2024 taxonomy did not become mandatory because the Commission did not adopt sustainability marking-up rules under Delegated Regulation (EU) 2019/815. The new draft reflects the revised ESRS adopted in July 2026, so the content shifts wherever the revised standards simplified, dropped or reworded a disclosure requirement. Companies that had started aligning to the 2024 taxonomy will find that EFRAG has provided a mapping version linking the revised datapoint list to the 2023 ESRS and the 2024 IG 3, which is the practical bridge for anyone who invested early.

Directive (EU) 2026/470 narrows the EU-level Article 19a and 29a scope to undertakings, or groups on a consolidated basis, that exceed EUR 450 million of net turnover and an average of 1,000 employees, subject to the Directive’s detailed individual, group and issuer provisions. Member States must transpose the relevant amendments by 19 March 2027, and the Directive contains specific rules and derogations for the 2025-2026 transition. Companies should therefore check the national law and transition provisions applicable to their reporting period rather than assume the new thresholds have already displaced domestic CSRD scope rules. The Omnibus also introduced a value-chain cap on the sustainability information a reporting company can demand from smaller entities in its chain, which we cover in the CSRD Omnibus value chain cap. Both change content and scope while leaving the tagging mechanics untouched, and together they define the population and the disclosures the taxonomy has to serve. For the standards themselves, see our note on the revised ESRS and simplified CSRD reporting.

The 2026 taxonomy remains a consultation-stage technical deliverable, so its validation architecture should not be treated as final. Any build relying on conditionality attributes or other validation rules should use the published 2026 taxonomy package and Explanatory Note and should be revisited when the binding ESEF marking-up rules are adopted.

Who should respond, and what financial-statement tagging already teaches

EFRAG says the consultation is particularly relevant to software vendors, XBRL specialists and digital reporting experts, and welcomes feedback from anyone with an interest in digital sustainability reporting. That framing is honest about who can meaningfully comment on a technical linkbase. It does not excuse preparers from looking. A company that files its own reports, or reviews what an agent files on its behalf, is the party that will live with any tag that does not match how it structures a disclosure.

The financial-reporting side of ESEF is the closest available preview of what supervised sustainability tagging could look like. In its 2025 corporate reporting enforcement report, ESMA found that European enforcers identified tagging errors in ESEF filings: issuers used markups that were too broad, outdated or meant for a different reporting scope, and dimensions were sometimes misapplied. ESMA maintains an ESEF Reporting Manual precisely to reduce that kind of inconsistency. None of that binds sustainability statements yet, because tagging is not mandatory. The ESEF experience still shows that once a taxonomy is in force, the quality of the tagging becomes a supervised matter in its own right.

There is also a connectivity dimension. ESRS 1 requires connections between the sustainability statement and the financial statements, and ESMA has reminded issuers to design their reporting so that those links, for example on anticipated financial effects or on significant capital and operating expenditure, can be traced. A tagging model that treats sustainability and financial data as unrelated silos makes that connectivity harder to evidence, which is a reason to design the data model with both in view from the start.

What an in-scope company can usefully do now

The honest answer is that nothing in this release requires a build. What it enables is a rehearsal. During the consultation window, a preparer can pull the draft taxonomy and its Explanatory Note from EFRAG’s digital ESRS taxonomies page and check three things: whether every datapoint it expects to report has a concept it can map to, whether the data type EFRAG assigned matches how the company captures that value, and whether any datapoint it considers material is missing or modelled in a way that would distort its disclosure.

Software vendors and the internal teams who operate their tools are the natural authors of a consultation response, because the issues that matter here are technical: enumeration sets that do not match a company’s own list of options, monetary datapoints that should allow ranges, or narrative datapoints that were split or merged in a way that breaks an existing mapping. A preparer who runs its data model against the draft now, and feeds the mismatches into a response before 11 November 2026, gets two things: an early view of its own gap list, and a chance to shape the tags it will later use. Waiting until the taxonomy is mandatory removes the second option entirely.

For teams that also need to place this in the wider reporting picture, our CSRD sustainability reporting guide sets out how the sustainability statement fits inside the annual report and the assurance timeline.

Frequently Asked Questions

Do we have to tag our next sustainability statement against this taxonomy?

No. Digital tagging of ESRS disclosures is not yet mandatory. The obligation depends on ESMA developing the digital-marking requirements for an amendment to Delegated Regulation (EU) 2019/815 and the Commission adopting it. ESMA reported in May 2026 that this work had been put on hold. Until the rules are in force, the taxonomy is a consultation draft and no undertaking is required to mark up its sustainability reporting against it.

What is the difference between the draft List of Datapoints and the draft XBRL taxonomy?

They are aligned deliverables but serve different users. The List is a human-readable navigation and gap-analysis aid published as EFRAG Secretariat supporting material, with its own fatal-flaw survey closing on 23 October 2026. The taxonomy is the machine-readable structure used to produce digital reports, with additional technical attributes and a consultation closing on 11 November 2026.

Which format will a tagged sustainability statement take?

The digital format is linked to Commission Delegated Regulation (EU) 2019/815 through Article 29d of the Accounting Directive. In-scope undertakings are to prepare the management report or consolidated management report in the Article 3 electronic format and, once the marking-up rules are adopted, mark up their sustainability reporting. For Transparency Directive issuers, that management report forms part of the ESEF annual financial report; the annual-financial-report framing does not apply to every CSRD reporter.

Does the taxonomy change what we have to disclose?

No. The disclosure content comes from the revised ESRS the Commission adopted on 3 July 2026. The taxonomy is the technical representation of those disclosures and does not add, remove or reword a requirement. A policy concern about a datapoint belongs to the standards process, not the taxonomy consultation.

If a datapoint is not material to us, do we tag it as empty?

ESRS 1 paragraph 24 generally prevents disclosure of information prescribed by an ESRS disclosure requirement or datapoint when that information is not material, subject to its stated supplementary-information exception. It does not establish the future XBRL treatment of non-material or omitted information. Until the binding marking-up rules are adopted, do not assume whether such information will be absent, nil-tagged or represented through another taxonomy mechanism.

We started mapping to the 2024 EFRAG taxonomy. Is that work lost?

Not entirely. The draft taxonomy is the revised-ESRS successor to the August 2024 ESRS Set 1 taxonomy, and EFRAG has provided a mapping version linking the revised datapoint list to the 2023 ESRS and the 2024 IG 3. That mapping version is the bridge for reusing earlier alignment work instead of rebuilding it.

Does the taxonomy include automatic checks that a required disclosure was made?

The 2026 taxonomy is a consultation-stage technical deliverable. Whether a particular disclosure is subject to an automated validation or conditionality rule must be determined from the published taxonomy package and Explanatory Note. Any build relying on those rules should be revisited when the binding ESEF marking-up rules are adopted.

Related Articles

• EFRAG 2026 Draft ESRS Datapoints List: the companion human-readable list that was prepared in parallel with the taxonomy and supports navigation of the revised ESRS datapoints.
• Revised ESRS: Simplified CSRD Reporting 2026: what the Commission changed in the standards the taxonomy now represents.
• ESMA ESEF Taxonomy Update 2026: the financial-reporting taxonomy that the sustainability tags will sit alongside.
• CSRD Omnibus Value Chain Cap: how the simplification limits the data a reporting company can demand from its value chain.
• EFRAG ESRS Knowledge Hub: 2026 Revised ESRS: EFRAG’s implementation-support materials for the revised standards.
• EU Taxonomy Disclosure Simplification: Article 8 KPIs: the Taxonomy Regulation disclosures that sit within the environmental section of the statement.

Key Takeaways

• The draft ESRS XBRL taxonomy consultation closes on 11 November 2026; the companion draft List of Datapoints has its own fatal-flaw survey closing on 23 October 2026.
• Digital tagging of ESRS disclosures requires ESMA to develop draft regulatory technical standards for amendments to the ESEF Regulation and the Commission to adopt the resulting amendments by delegated act; no mandatory tagging obligation applies before those marking-up rules are adopted.
• ESMA reported in May 2026 that development of the sustainability digital requirements had been put on hold pending its assessment of Omnibus changes, revised ESRS and related taxonomies.
• The future marking-up rules will be implemented through Commission Delegated Regulation (EU) 2019/815. Article 29d links CSRD management reports to its Article 3 electronic format; for Transparency Directive issuers, the management report is also part of the XHTML annual financial report.
• Materiality still governs the information disclosed under ESRS 1 paragraph 24, but the future binding marking-up rules will determine the XBRL treatment of non-material or omitted information.
• The draft replaces the August 2024 taxonomy and reflects the revised ESRS adopted 3 July 2026; EFRAG supplies a mapping version linking the revised datapoint list to the 2023 ESRS and the 2024 IG 3.
• The 2026 taxonomy’s validation architecture is consultation-stage. The published taxonomy package and Explanatory Note should be used to determine which conditionality attributes and validation rules are currently implemented, and the build should be revisited when the binding ESEF marking-up rules are adopted.
• Run your data model against the draft during the window to produce a gap list and to shape the tags you will later use.

Sources and References

• EFRAG, “EFRAG Releases Draft ESRS XBRL Taxonomy for the Revised ESRS and Launches Public Consultation” (17 September 2026): efrag.org
• EFRAG, “EFRAG Secretariat Releases 2026 Draft List of Datapoints for Revised ESRS” (28 August 2026): efrag.org
• Directive (EU) 2022/2464 of 14 December 2022 (Corporate Sustainability Reporting Directive), OJ L 322, 16.12.2022: eur-lex.europa.eu
• Directive (EU) 2026/470 of the European Parliament and of the Council (Omnibus Directive, amending CSRD scope), transposition deadline 19 March 2027: eur-lex.europa.eu
• Commission Delegated Regulation (EU) 2019/815 (ESEF Regulation, RTS on a single electronic reporting format), OJ L 143, 29.5.2019: eur-lex.europa.eu
• European Commission, “Commission adopts revised sustainability reporting standards” (3 July 2026): finance.ec.europa.eu
• ESMA, Public Statement on the first-time application of the ESRS reporting requirements (ESMA32-992851010-1597, July 2024): esma.europa.eu
• ESMA, Report on the 2025 Corporate reporting enforcement and regulatory activities (ESMA32-2064178921-9413, May 2026): esma.europa.eu

What to check before 11 November 2026

The draft ESRS XBRL taxonomy adds no filing task, yet it opens a short window in which a preparer can influence the tags it will eventually depend on. The productive move is to run the revised-ESRS datapoints you expect to report against the draft concepts and their data types, log every mismatch, and route the technical ones into a consultation response before the 11 November 2026 close. After that, EFRAG plans to submit the finalised taxonomy to ESMA and the Commission; the next regulatory milestone is ESMA’s draft RTS, followed by Commission adoption of the amendment to Delegated Regulation (EU) 2019/815 that would establish the binding marking-up rules.

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