Your auditor asks why a revenue line carries an extension instead of the standard element. Finance knows the number inside out. The tag? A vendor chose it, and nobody remembers why.
For years, that was fine. ESEF was a filing task, and tagging was the last step.
Not anymore. Regulators analyse ESEF data centrally. Since July 2026, it has flowed toward the European Single Access Point. Enforcers are discussing how AI can read it.
Your tags are now financial data. The real question is whether finance and accounting own them. Here’s how to make sure they do.
Who Reads Your ESEF Data First? Usually, not a Person
Machines often read your ESEF filing before any person does. This shift toward machine-readable financial reporting changes how organizations must think about ownership, controls and review.
| Who reads your ESEF data | What they do with it |
| ESMA and national enforcers | Run automated checks, compare issuers and select filings for review |
| ESAP users (public from July 2027) | Access your filings alongside every other EU issuer’s, in one place |
| Analysts and data providers | Pull tagged figures straight into models and screens |
| AI tools | Read and compare reports at scale, including tools regulators are exploring |
ESMA believes ESEF’s full value depends on three things: accessible data, high-quality data and practical tools. Its central collection of ESEF reports already supports comparative analysis and supervisory insights.
ESAP raises the stakes further. Since 10 July 2026, issuers submit regulated information to their national collection body for ESAP when they publish it. ESMA must open the platform by 10 July 2027.
After that, a tagging decision doesn’t just affect the filing process. It becomes part of a public dataset that investors, analysts, regulators and data providers can compare across thousands of issuers.
Why Finance Teams Fall Behind on ESEF Data Governance
The problem isn’t expertise. It’s ownership. Many teams still treat ESEF data separately from the financial information it represents.
| How ESEF is often handled today | What structured data demands |
| Tags are a formatting step | Tags are financial data |
| A vendor or IT owns tagging | Finance owns every element choice |
| Checks happen at the end | Controls run during close and drafting |
| The PDF is the “real” report | The ESEF version is the official one |
| Each year’s tagging starts fresh | Tagging stays consistent year to year |
The cost shows up in enforcement. In 2025, enforcers acted on 80 of the 613 filings whose tags they examined. Of the 266 actions taken after filing checks, 209 required a resubmission or republication. ESMA’s 2025 enforcement findings show the consequences of weak ESEF controls and governance.
Five Ways Finance Teams Can Catch Up on ESEF Data
1. Put a Finance Owner on Every Tag
Every tagging decision reflects an accounting judgement. Choosing an element determines how a figure will be interpreted. Creating an extension means deciding that no standard element fits. Those are finance decisions, even when a specialist applies them.
ESMA recommends joint reviews between preparers and ESEF specialists, particularly when choosing elements or designing extensions.
Catch-up move: Name a finance reviewer for the primary statements and each major note. Let specialists recommend tags but require finance approval before filing.
2. Control Tags the Way You Control Numbers
You wouldn’t let a balance sheet total go unchecked until filing week. Apply the same controls to tags that you apply to financial data.
ESMA asks issuers to build sign, scaling and consistency checks directly into the preparation workflow. Calculations 1.1, required under ESMA’s Reporting Manual, handles rounding properly, so validation flags real errors instead of noise.
Catch-up move: Add tagging checks to your year-end close checklist, next to your financial tie-outs.
3. Make the ESEF Version Your Master Copy
Many reporting processes still revolve around the PDF. Regulators increasingly focus on the structured ESEF report, which serves as the official filing.
If the PDF and ESEF versions don’t align, questions can arise about which version reflects the underlying reporting decisions.
Catch-up move: Finalize and approve the ESEF report first, then generate the PDF from the approved version.
4. Keep Your Data Consistent Year to Year
Structured data delivers value only when it remains comparable over time. When a line item gets a different element this year, or a new extension replaces last year’s standard tag, the trend breaks for anyone reading your data.
Unnecessary changes in taxonomy selection can make trends harder to analyse and reduce comparability across reporting periods.
Catch-up move: Compare this year’s taxonomy choices with last year’s before the review process begins.
5. Let AI Handle the Volume, Not the Judgement
A full annual report holds thousands of tagged facts. No team can review each one with the same scrutiny, and AI shouldn’t make material tagging decisions on its own.
AI can suggest tags, cross-check figures, flag changes since last year and spot untagged numbers. That leaves your team free to focus on the decisions that need professional judgement.
Catch-up move: Use AI to narrow the review to exceptions. Keep a named person on every approval.
ESEF Maturity Check: Where Does Your Team Stand?
| Area | Level 1: Reactive | Level 2: Progressing | Level 3: Leading |
| Ownership | Vendors drive tagging | Finance reviews key decisions | Finance & accounting own all tagging decisions |
| Timing | Tagging starts after sign-off | Tagging begins during drafting | Tags update as the numbers change |
| Controls | Validation only in the final week | Validation at key milestones | Validation throughout the process |
| Master Copy | PDF is the primary report | PDF and ESEF reviewed separately | ESEF is the source version |
| Consistency | Tagging restarts each year | Major changes are reviewed | Every change is documented |
| AI & Automation | Fully manual process | AI assists tagging and review | AI flags exceptions; humans approve |
What Your Results Mean
- Mostly Reactive? Your ESEF process is still largely filing-driven. That increases the risk of late corrections, rework and inconsistent tagging decisions.
- Mostly Progressing? You’ve introduced stronger controls, but opportunities remain to improve consistency, efficiency and governance.
- Mostly Leading? ESEF is embedded in your reporting process, with clear ownership, stronger controls and a more scalable review approach.
If you’re still in the Reactive stage, start with ownership. Finance-led governance is the foundation for stronger controls, consistency and automation.
How Disclosure Management Software Helps Teams Catch Up
Processes alone aren’t enough. As reports grow more complex, spreadsheets, emails and disconnected files make consistency difficult to maintain.
A disclosure management platform brings reporting, tagging, review and approval into a single workflow.
Figures flow from the trial balance into the report and its tags. AI flags exceptions while drafts change. The platform logs every approval, so your auditor can trace who decided what.
The goal isn’t to add another tool. It’s ensuring the same rigor, accountability and control for tagged data that already exists for financial reporting.
ESEF Structured Data: FAQs
1. What is structured data in ESEF?
It’s the machine-readable layer of your annual report. Issuers tag their IFRS consolidated financial statements in Inline XBRL, so software can read each figure and its meaning.
2. Who uses ESEF data?
ESMA, national enforcers, analysts, data providers and, from July 2027, anyone using the European Single Access Point.
3. Does ESAP change what ESEF filers must report?
No. ESAP adds no new reports. It changes where the ones you already file can be found and how easily they can be compared, although they must now be submitted with additional metadata.
4. Who should own ESEF tagging?
Financial reporting and technical accounting should own the decisions. Specialists can apply tags, but each element and extension choice is an accounting judgement.
5. Can AI help finance teams catch up on ESEF?
Yes. AI can suggest tags, check figures and flag changes at scale. A qualified person should still approve every result.
