NemHandel consultation to transition from OIOUBL to a single Peppol-based e‑invoice standard

Summary (3 bullet points)

• Denmark has opened a March 2026 public consultation on a new NemHandel strategy to phase out OIOUBL and adopt a single Peppol-based standard (NemHandel BIS 4). [kpmg.com], [fiscal-req…ements.com]
• The reform aims to replace the current dual-format system (OIOUBL + Peppol) with one common specification, reducing complexity and aligning with EN 16931 and ViDA requirements. [kpmg.com], [europe.tho…euters.com]
• The initial scope focuses on invoice-related documents (invoices, credit notes, responses), with other documents to follow later, and full transition targeted by mid‑2029. [kpmg.com], [europe.tho…euters.com]

Article

Denmark is undertaking a structural reform of its e‑invoicing framework, moving away from its long-established national format (OIOUBL) toward a unified, Peppol-based standard under the NemHandel platform. This shift was formalised through a public consultation launched on 12 March 2026 by the Danish Business Authority, marking a decisive step in the country’s digital transformation agenda. [kpmg.com]

From dual formats to one common specification

For nearly two decades, Denmark has operated a dual-format model, allowing invoices to be exchanged either in the domestic OIOUBL format or the international Peppol BIS standard. While both formats comply with the European semantic standard EN 16931, their coexistence has created technical complexity, duplication of effort, and higher implementation costs for businesses and service providers. [peppol.nu], [fiscal-req…ements.com]

Stakeholder feedback collected through the NemHandel forum and broader consultations confirmed a clear preference for simplification. As a result, the Danish authorities now propose to abolish the dual-format approach and adopt a single, harmonised e‑invoice specification based on Peppol BIS 4, referred to as NemHandel BIS 4. [kpmg.com], [europe.tho…euters.com]

This new model will combine the international interoperability of Peppol with Danish-specific extensions, ensuring compliance with local requirements while maintaining cross-border compatibility. [kpmg.com]

Consultation scope and phased transition

The consultation focuses on defining a new document strategy for NemHandel, including both technical and governance aspects of the future e‑invoicing ecosystem. It explicitly proposes:

• The gradual phase-out of OIOUBL 2.1
• The introduction of NemHandel BIS 4 (Peppol-based) as the sole standard
• A multi-year migration timeline, culminating in full adoption by mid‑2029 [kpmg.com], [fiscal-req…ements.com]

The transition is structured in stages:

• 2026–2027: development of Peppol BIS 4 and Danish extensions
• 2028: release candidate, testing, and finalisation
• 2028–2029: phased implementation and decommissioning of OIOUBL
• Mid‑2029: full transition to Peppol-based invoicing [kpmg.com], [fiscal-req…ements.com]

Importantly, current compliance obligations remain unchanged during the consultation and early transition phases. [europe.tho…euters.com]

Invoices first: a targeted starting point

A key design feature of the reform is its phased functional scope. The Danish Business Authority has confirmed that the initial rollout will focus exclusively on invoice-related documents, including:

• Invoices
• Credit notes
• Invoice responses (application messages) [kpmg.com], [europe.tho…euters.com]

Other business documents, such as orders and e‑receipts, will continue to be supported in both OIOUBL and Peppol formats for the time being, with migration decisions deferred. [europe.tho…euters.com]

This “invoice-first” approach reflects both the maturity of invoice standardisation and the need to prioritise areas with the highest compliance and business impact.

Alignment with EU policy and Peppol architecture

The move toward a single Peppol-based standard is closely aligned with broader European developments. In particular:

• The new format will comply with EN 16931, the EU’s semantic standard for e‑invoicing
• It supports upcoming VAT in the Digital Age (ViDA) requirements, including cross-border e‑invoicing obligations from 2030
• It leverages emerging Peppol innovations such as the PINT architecture, enabling flexible national extensions within a common framework [kpmg.com], [fiscal-req…ements.com]

By consolidating on Peppol, Denmark is effectively positioning itself within a pan-European and increasingly global interoperability model, reducing fragmentation and supporting cross-border trade.

Strategic implications

This reform represents a fundamental shift rather than a technical upgrade. It signals:

• The end of nationally maintained invoice formats in favour of international standards
• A move toward standardisation, scalability, and interoperability
• A clear governance model with one common e‑invoice specification

For businesses, the implications are significant. Existing systems built around OIOUBL will eventually need to migrate, while investments in Peppol infrastructure will become central to compliance.

Links / Sources

• KPMG – Denmark: Public consultation on new e‑invoicing format
• Fiscal Requirements – Denmark launches consultation on Peppol-based e‑invoicing
• VATupdate – Denmark replaces OIOUBL with Peppol BIS 4
• RTC Suite – Denmark commits to Peppol as single standard
• Marosa VAT – Denmark e‑invoicing consultation overview

---

Briefing Document & Podcast: E-Invoicing and E-Reporting in Denmark – VATupdate

---

 

---

---