ESEF Reporting Manual 2025: Key ESMA Updates and What Issuers Need to Know

ESEF Reporting Manual 2025 introduces several key updates issued by the European Securities and Markets Authority (ESMA) to improve the accuracy, transparency, and comparability of digital financial reporting across the EU. The updated manual focuses on aligning reporting practices with evolving IFRS standards, refining taxonomy usage, and enhancing validation and packaging requirements for issuers.

These refinements reflect ESMA’s ongoing efforts to strengthen structured reporting processes and support issuers transitioning toward IFRS 18 and IFRS 19 in the coming years.

In this comprehensive overview, we break down the key updates to the ESMA ESEF Reporting Manual 2025 and explain what issuers need to do to ensure full compliance ahead of upcoming filing cycles.

Why the Update Matters

Since its introduction in 2020, the ESEF framework has evolved into the cornerstone of digital transparency for European listed companies. Each annual update refines taxonomy standards, validation guidance, and technical specifications — ensuring issuers deliver reports that are not only compliant but also easier for regulators, investors, and analysts to interpret.

The 2025 update is particularly important, as it anticipates the integration of IFRS 18, adopts advanced calculation rules, and clarifies long-standing questions around tagging practices, file naming, and packaging requirements.

1. IFRS 18 Integration in the ESEF Reporting Manual 2025

The ESEF Reporting Manual 2025 introduces IFRS 18 (Presentation and Disclosure in Financial Statements) into the ESEF taxonomy through a separate entry point designed to support gradual transition.

However, use of IFRS 18 and IFRS 19 elements will only be allowed once the standards are formally endorsed by the EU. There is no obligation to apply them before 2027.

This change is directly reflected in the ESEF Reporting Manual 2025, which introduces a dedicated entry point to support gradual IFRS 18 adoption.

What this means for issuers:

1. You may begin familiarising your reporting and tagging process with IFRS 18 structure.
2. IFRS 18 and 19 elements should not be used in live filings before endorsement.
3. Early testing and pilot exercises are encouraged to prepare for 2027.
   

This dual-entry point design ensures continuity for companies still reporting under the current IAS 1 structure while preparing for a future transition.

2. Extension Anchoring Rules in the ESEF Reporting Manual 2025

ESMA has tightened its guidance on extension anchoring to improve data quality and comparability.
When creating custom (extension) elements, issuers must now ensure that:

Each extension shares the same or a stricter data type as the base ESEF taxonomy concept to which it is anchored.

For example, an element based on a monetaryItemType must remain within that data type family and cannot be replaced with a broader or incompatible type such as stringItemType.

Implications:

1. Issuers must review all extensions and update their anchoring definitions accordingly.
2. Failure to comply may result in validation issues during regulator review.
3. This rule enforces stronger semantic consistency across filings.
   

3. Context Dates for “Instant” Facts

ESMA has clarified the context date for “instant” type facts (such as balance sheet items). Preparers must now use:

31 December of the previous year (e.g., 2024-12-31) instead of 1 January of the reporting year.

This ensures precise representation of the entity’s financial position and eliminates inconsistencies between period-end and opening balance tagging.

Action for preparers:

1. Update tagging templates to automatically apply the prior year-end date for instant facts.
2. Check that prior comparatives follow the same rule.
   

4. Handling Empty or Dash Values

Empty cells or placeholders such as “–” or “n.a.” have historically created ambiguity in XBRL filings. The 2025 Manual now mandates that:

Empty fields or dash values in primary statements must be tagged as zero (“0”) where applicable.

This rule helps maintain data completeness, ensures accurate validation, and supports automated data analysis.

What issuers should do:

1. Replace placeholder characters with “0” when the value logically represents zero.
2. Validate all primary statement tags to confirm numeric consistency.
3. Document any exceptions for auditor review.
   

5. File Naming Convention Update

The ESEF file naming convention has been revised for improved version control and clarity.

Version numbering now starts from “1” instead of “0.”

Updated format:

{base}-{date}-{version}-{language}.xbri

Example: CompanyName-2024-12-31-1-en.xbri

This adjustment streamlines regulator submissions and reduces confusion over sequential report versions.

Recommended action:

Update report generation systems and automated workflows to follow the new convention.

6. Mandatory Use of Calculations 1.1

ESMA now requires the use of the Calculations 1.1 specification for defining arithmetic relationships, officially replacing the older XBRL 2.1 approach.

This change brings improved precision, flexibility, and consistency to calculation linkbases. It also enables enhanced handling of rounding, subtotals, and nested relationships.

Key takeaways:

1. Software must support the Calculations 1.1 specification.
2. All calculation linkbases must be reviewed and validated against the new structure.
3. This update strengthens numerical reliability and reduces validation warnings.
   

7. Roll-forward Relationships

To promote clarity and standardization, ESMA has added structured examples demonstrating best practices for defining:

1. periodStart
2. periodEnd
3. total labels in roll-forward relationships.

These examples are intended to improve roll-forward consistency checks and ensure smoother audit and validation processes.

Practical implications:

1. Review roll-forward relationships (e.g., movements in equity, provisions, or PPE).
2. Align label and relationship naming conventions with the examples provided in the Manual.
   

8. Report Package Clarification

The 2025 Manual clarifies how report packages containing multiple files should be submitted.

If an issuer’s report includes separate image files or supplementary graphics, these must be zipped together with the primary XHTML report for submission.

This ensures the submission package remains complete and compliant during upload to the Officially Appointed Mechanism (OAM).

What issuers should ensure:

1. ZIP archives include all referenced files (XHTML, images, tables).
2. Submission systems validate file completeness before dispatch.
   

9. Technical Guideline Updates

ESMA has also recommended several technical clarifications and refinements across the following guidance sections of the manual:

1. 2.2.4 – Facts duplication
2. 2.2.7 – Technical construction of a block tag
3. 2.4.1 – Inline XBRL constructs that shall be avoided
4. 2.5.2 – Indication of the language used in textual mark ups
5. 3.2.2 – Data types to be used on extension concepts

While these appear minor, they can affect validation outcomes and should be implemented as part of preparers’ annual compliance review.

Preparing for ESEF 2025 Compliance

The 2025 updates reinforce ESMA’s emphasis on precision, consistency, and transparency in digital financial reporting. To stay compliant and minimize last-minute challenges, issuers should:

1. Assess readiness: Review tagging logic, extensions, and filing processes against each new rule.
2. Upgrade tools: Ensure your reporting solution supports Calculations 1.1 and stricter anchoring logic.
3. Validate early: Run pre-submission checks to detect context-date, data-type, or zero-tagging issues.
4. Plan for IFRS 18: Begin understanding IFRS 18 presentation structures to ease the eventual transition.
5. Coordinate teams: Align finance, disclosure, and audit teams around updated ESEF practices.

How Ez-XBRL Helps You Stay ESEF-Ready

At Ez-XBRL, we continuously adapt our technology and services to stay aligned with evolving ESEF and IFRS requirements. Our solutions ensure your reports are not only compliant but also audit-ready, accurate, and seamlessly validated.

With Ez-XBRL, you can:

Our team works closely with clients to simplify every step of the digital reporting process — from taxonomy integration to final regulator submission.

Final Thoughts

The ESMA ESEF Manual 2025 marks another milestone in the evolution of structured financial reporting. While the updates may seem technical, they represent meaningful progress toward more reliable, transparent, and comparable financial disclosures across Europe.

By acting early — updating your systems, workflows, and validation processes — issuers can turn compliance into confidence. Organisations that update processes early will experience a smoother transition under the ESMA ESEF Reporting Manual 2025 requirements.

Ez-XBRL stands ready to guide you through every aspect of the ESEF 2025 transition, helping you stay compliant, efficient, and ahead of the curve.

Book a personalised walkthrough today