Update 2025 of the core taxonomy adopted as ESEF Regulation

On 18 March 2026, the seventh version of the European Commission’s Delegated Regulation (EU) 2026/283 of 12 December 2025 amending the regulatory technical standards laid down in Delegated Regulation (EU) 2019/815 as regards the 2025 update of the taxonomy for the single electronic reporting format (ESEF) was published in the Official Journal of the European Union.

This Regulation amends the previous version of Regulation (EU) 2025/19 of 26 September 2024 (we reported). This update of the ESEF Regulation adopts the new version of ESMA’s core taxonomy to be used for ESEF. The core taxonomy is now based on the 2025 annual update of the IFRS Accounting Taxonomy published by the IFRS Foundation in March 2025.

The Taxonomy Update 2025 applies to financial years beginning on or after 1 January 2026. However, issuers are allowed to adopt the core taxonomy 2025 specified in this Regulation for financial years beginning before 1 January 2026.

Background:

The core taxonomy to be used for ESEF is developed by ESMA and builds on or is an extension of the IFRS Accounting Taxonomy. The IFRS Foundation annually updates the IFRS Accounting Taxonomy to reflect, amongst other developments, the issuance of new IFRSs or the amendment of existing IFRSs, the analysis of disclosures commonly reported in practice, or improvements to general content or technology of the IFRS Accounting Taxonomy. Therefore, the regulatory technical standards are updated accordingly to reflect each annual update of the IFRS Accounting Taxonomy.