Understanding the Changes, Mapping Requirements, and Implementation Impact
In today’s digital reporting environment, European companies submit financial statements in a machine-readable format using the ESEF Taxonomy, rather than as traditional documents.
Each tag identifies a specific financial concept, such as revenue, operating profit, or tax expense. This makes financial reports easier to understand, compare, and analyze.
Every year, ESMA updates the taxonomy to keep it aligned with the latest accounting standards. This is a routine update.
With IFRS 18 coming into effect, the 2026 taxonomy update is the biggest in the last two decades.
Why IFRS 18 Forces a Taxonomy Update
IFRS 18 changes how companies present the income statement. The new structure improves consistency and makes financial reports easier to compare.
The standard requires companies to report new subtotals, such as operating profit and profit before financing and income taxes.
Another important change involves Management Performance Measures (MPMs), which are companies’ adjusted performance measures. Under IFRS 18, these measures are now subject to formal disclosure and audit.
IFRS 18 introduces a reporting structure. To reflect these changes, ESMA published the 2025 ESEF Taxonomy on 21 April 2026 with new taxonomy tags.
Clarifying a Common Confusion
A common misconception is the ESEF unchanged for this year because of IFRS 18. However, that is not the case.
To support the new IFRS 18 requirements, ESMA updated the 2025 ESEF Taxonomy by:
- Adding new entry points
- Introducing tags for the new mandatory subtotals,
- Creating new elements for Management Performance Measures (MPMs).
After releasing these changes, ESMA decided not to issue another taxonomy update for the remainder of 2026.
Why Regulators Are Pausing Further Updates
According to ESMA, the objective is to provide regulatory stability while companies and software providers implement IFRS 18. The IFRS Foundation has reached the same conclusion, confirming that there is no new base taxonomy release in 2026.
Companies are already adjusting to the significant changes introducing another taxonomy update in the same year would create additional complexity.
The pause was meant for smoother transition and not delay to future progress.
What the Pause Does Not Cover
Though the taxonomy has been paused, the implementation work for companies has not. Organizations still need to:
- Remap general ledger accounts to the new income and expense categories.
- Restate comparative financial information to match the new reporting structure.
- Define, document, and reconcile their Management Performance Measures (MPMs).
The Dual Entry-Point System
The 2025 ESEF Taxonomy has been designed to support both current and future reporting requirements.
- One for companies continuing to report under IAS 1.
- Another for companies that choose to adopt IFRS 18 early.
ESMA has set a mandate that each filing can use either IAS 1 or IFRS 18, cannot mix both in the same report.
Early testing of the IFRS 18 entry point helps companies prepare for the transition. It also reduces implementation risks.
A Deep Dive into the Mapping Process
Mapping involves associating each financial statement line item to the appropriate tag in the ESEF Taxonomy. The following section explains the key mapping changes companies need to make to prepare for IFRS 18-compliant ESEF reporting.
1. New standard elements for new mandatory subtotals
IFRS 18 incorporates two new mandatory subtotals in the statement of profit or loss:
- Operating profit
- Profit before financing and income taxes
The 2025 ESEF Taxonomy provides standard tags for both subtotals to support these changes. Companies that use custom tags should check their mappings and replace them with standard taxonomy elements whenever possible.
2. Mandatory deprecation of duplicate extension elements
The updated ESEF Taxonomy provides standard tags for several IFRS 18 disclosures. Companies should review their custom tags and update them where needed. Using standard tags reduces duplication and makes reporting more consistent.
3. A new tagging structure for Management Performance Measures
In IFRS 18, Management Performance Measures (MPMs) become a formal reporting requirement rather than an informal disclosure.
ESMA states that MPMs are generally consistent with its Alternative Performance Measures (APM) Guidelines. Even so, companies should review their existing APM mappings instead of assuming they are IFRS 18 compliant. Companies should assess each MPM against the new IFRS 18 requirements and map it using the appropriate taxonomy elements.
4. Anchoring relationships require a full review, not a spot check
Extension elements help companies report information that is not covered by standard taxonomy tags. Each extension element must link to the closest standard taxonomy element. This ensures users and software can interpret it correctly.
Companies should review their existing anchoring relationships because IFRS 18 changes the reporting structure. This helps ensure they still reflect the correct financial concept.
5. Timing constraints on when new elements can be used
The 2025 ESEF Taxonomy includes new elements for IFRS 18 and IFRS 19. Companies could not use them until the EU formally approved the standards.
The European Commission approve the standards before the 2025 ESEF Taxonomy release. This allowed companies to begin using the new taxonomy elements.
This demonstrates that implementation depends on both technical preparation and regulatory approval.
6. Comparative-period mapping doubles the workload
Under, IFRS 18 companies need to restate the comparative figures using the new reporting structure. This means that mapping is not limited to the current years financial statements, prior period figures must also be reviewed and remapped.
This additional work, updating comparative figures is on of the biggest tasks during the transition,
7. Conformance testing before filing
The updated Conformance Suite is comprise of the 2025 ESEF Taxonomy. It allows companies to check their digital reports before submission.
Testing early helps identify mapping issues. It can find missing tags, deprecated elements, and incorrect anchoring before the final submission.
Who Is Affected Most
The transition to IFRS 18 will affect companies differently.
- Large organizations may face significant implementation work, but they often have dedicated reporting teams and resources to manage it.
- Small and mid-sized companies are likely to face greater challenges, as they must meet the same requirements with smaller finance teams.
- Companies that frequently use Management Performance Measures (MPMs) will need to prepare for additional disclosure and audit requirements.
Although the taxonomy remains stable, the implementation effort does not. Companies that delay preparation risk falling behind.
Why Early Preparation Matters
Companies often receive updated ESEF taxonomy files well before the filing deadline. However, many delay their preparation until the final months.
IFRS 18 makes this approach more challenging. It introduces major changes to financial reporting and taxonomy mapping.
Starting early helps reduce compliance risks, avoid filing delays, and improve reporting accuracy.
How the Right Reporting Infrastructure Helps
The implementation of IFRS 18 requires companies to manage new mappings, review existing taxonomy elements, and coordinate changes across multiple teams. As these activities grow in complexity, manual processes can become difficult to maintain.
Disclosure management platforms help streamline this work by providing a single environment to manage taxonomy mappings, monitor updates, validate disclosures, and maintain reporting consistency.
Although technology does not replace accounting expertise, it supports a more controlled and efficient implementation process. Organizations that combine early planning with well-designed reporting processes will be better prepared for the IFRS 18 transition.
Conclusion
The 2025 ESEF Taxonomy is ready to support the changes introduced by IFRS 18. While no further taxonomy updates planned for 2026, companies still have significant implementation work to complete.
Starting early, reviewing taxonomy mappings, and using efficient reporting processes can help organizations make the transition with greater confidence and fewer compliance challenges.
FAQ (Frequent Asked Questions)
How IFRS 18 Shaped the 2025 ESEF Taxonomy
IFRS 18 introduces new mandatory subtotals and MPM disclosure requirements, so ESMA added new tags, entry points, and elements to the taxonomy to support them.
Why ESMA Paused Further ESEF Taxonomy Updates in 2026
ESMA and the IFRS Foundation will not release another taxonomy update in 2026. However, companies still need to remap accounts, restate comparative figures, and finalize MPM tagging. The pause applies only to future updates, not to implementation work.
Can a Single ESEF Filing Include both IAS 1 and IFRS 18 Entry Points?
No. Companies can choose between two entry points, one for IAS 1 and one for IFRS 18. However, they must use only one entry point in a single filing.
Does an existing APM tag automatically satisfy IFRS 18’s MPM tagging requirements?
No. Companies should review each APM under the new IFRS 18 MPM requirements. They should use the dedicated MPM taxonomy elements where applicable.
Why Does Comparative-Period Mapping Increase the Implementation Effort?
Companies must remap prior-period figures as well as current-year figures. IFRS 18 requires both to follow the new reporting structure. This is often one of the most time-consuming parts of the transition.
