The Danish Business Authority has released OIOUBL schematron version 1.16.0.RC for OIOUBL 2.1. This update introduces optional CO2 data fields, stricter currency validation, and technical improvements to enhance data quality ahead of the 27 November 2025 implementation deadline.
OIOUBL 1.16.0 brings new sustainability features
The latest version introduces optional CO2 data fields in e-invoices, supporting environmental transparency in business reporting. While these fields are optional, the data will be validated when used. This step builds on Denmark’s broader move toward digital compliance, as outlined in the digital bookkeeping updates for 2025.
Stricter validation and technical refinements
The release enforces stricter currency code validation and brings several technical enhancements that improve data accuracy and overall invoice quality across the NemHandel network.
Timeline and implementation deadline
The Release Candidate was issued on 14 October 2025. The final version is expected by the end of October, with a mandatory implementation deadline on 27 November 2025. Companies should test and update their systems in time to ensure compliance.
Preparing for the next phase of e-invoicing
With this release, Denmark continues to lead in digital and sustainable e-invoicing. Integrating CO2 data into invoice structures supports reliable environmental reporting alongside fiscal compliance. Technical details and documentation are available on the official NemHandel page: oioubl-21-schematron-version-1160rc.
Changes companies need to implement
- Enable support for optional CO2 data in e-invoices, validated when included.
- Review currency code validation to meet the new enforcement rules.
- Apply technical updates to improve data accuracy and consistency.
- Prepare for mandatory implementation by 27 November 2025.
- Align with Denmark’s 2025 digital bookkeeping framework where relevant.
