The expected release of the updated European Norm (EN 16931-1:2026) is more than a technical detail: it fully serves to usher in the required generational shift in how German businesses exchange tax-compliant data. For service providers, the announcement by the Coordination Office for IT Standards (KoSIT) regarding the development of XRechnung 4.0 confirms that the “wait-and-see” period is about to be over.
As the official standards body for the German public sector, KoSIT’s alignment with the new European semantic model ensures that XRechnung will not only remain the gold standard for B2G transactions but will also serve as the primary vehicle in the continuing implementation of the German B2B mandate as well as the EU’s ViDA requirements.
The KoSIT announcement: a summary
KoSIT recently outlined publicly its strategic roadmap [↗︎] for the transition to XRechnung 4.0. The standards body emphasizes that the fundamental changes in the underlying European Norm (which it expects still in March 2026) necessitate this major version jump.
Key takeaways from the announcement include the commitment to a synchronized release cycle that mirrors the finalization of the EN 16931-1 revision. KoSIT highlights that XRechnung 4.0 will integrate the new B2B-specific data elements and corrections directly into the German Core Invoicing Usage Specification (CIUS), ensuring that businesses and their service providers have a singular, compliant path forward for both domestic and cross-border invoicing.
Highlights of the technical evolution
The move to XRechnung 4.0 reflects the three critical pillars of the EN 16931-1 update:
- Correction of Legacy Shortcomings: The update finally resolves long-standing technical hurdles, such as ambiguous tax category combinations and rounding issues. These structural fixes will reduce the “validation friction” service providers currently face particularly when mapping complex German tax scenarios to the current standard.
- Native B2B Functionality: Moving beyond procurement in the public sector, the new version introduces elements to reflect real-world B2B complexities. This includes better support for multiple orders or delivery notes within a single document, a functionality that previously required custom extensions but will now be part of the core standard.
- ViDA Readiness and Payment Flexibility: To align with “VAT in the Digital Age” (ViDA), XRechnung 4.0 will include enriched data fields for Digital Reporting Requirements (DRR). This includes more granular bank account information and the ability to define multiple payment terms and early-payment discounts (Skonto), which are widely used in German commercial practice.
Impact and migration: the road to 2028, and 2030
Looking ahead, the German implementation timeline offers two major milestones on businesses calendars with regards to electronic invoicing and tax reporting:
- First, in 2028, virtually all German businesses have to also issue and send invoices electronically. The current state of silent paralysis will have to change soon owing to the realization that „yes, my business is in scope!“
- Followed in July 2030 by the implementation of national and intra-community VAT tax reporting, for each transaction, based on these electronic invoices, as per the ViDA directive.
For service providers and software vendors, the most critical realization is that XRechnung 4.0 will not be backward compatible. The introduction of modified business rules and updated syntax bindings (UBL 2.5 and CII D25A) means that current “Version 3.x” pipelines will require significant upgrades. Migration planning must begin now, as the transition involves more than just field mapping: it requires a fundamental shift in how validation and conversion engines operate.
Consequently, we expect (at least) two parallel workstreams to dominate the landscape:
- Peppol BIS 4.0: OpenPeppol has already launched a workgroup to combine this EN update with the new “PINT” methodology, ensuring that German service providers using the Peppol network can transition seamlessly to a globally interoperable format.
- The KoSIT Roadmap: The specification for XRechnung 4.0 is expected to be published following the formal CEN specification publication and votes on the supporting syntax mapping in the second half of 2026.
This update represents an essential piece of the puzzle, also for Germany’s B2B mandate. By aligning XRechnung 4.0 with the new European Norm, the industry is moving toward a future where “German compliance” and “European interoperability” are one and the same.
