Copenhagen, 30 June 2026 – Denmark has confirmed the implementation timeline for its transition to a single Peppol-based e-invoicing standard. Denmark NemHandel BIS 4 2028 becomes the sole mandatory standard from November 2028. The current OIOUBL 2.1 format will be fully phased out by May 2029. For exporters invoicing Danish public bodies or large Danish businesses, this is a concrete deadline to update ERP configurations and invoicing processes.
This article is an update to our earlier post Denmark e-invoicing Peppol standard: from dual system to single standard (17 February 2026), which covered the initial announcement.
What is changing?
Denmark has operated a dual e-invoicing environment for years: the Danish OIOUBL format (mandatory for B2G since 2005) and Peppol BIS Billing 3.0. The Erhvervsstyrelsen (Danish Business Authority) has confirmed that this dual system will be consolidated into NemHandel BIS 4.
- May–November 2028: implementation period. NemHandel BIS 4 is available; adoption is voluntary but strongly recommended.
- November 2028: NemHandel BIS 4 becomes mandatory. All receiving systems must be able to process the format.
- May 2029: OIOUBL 2.1 is fully phased out. Invoices in the old format will no longer be accepted.
What is NemHandel BIS 4?
NemHandel BIS 4 is Denmark’s national implementation of Peppol BIS 4.0, the next-generation Peppol invoice format. BIS 4.0 merges the current Peppol BIS 3.0 and the international PINT format into a single harmonised model. NemHandel BIS 4 is also aligned with the EU’s ViDA Digital Reporting Requirements for the period after 2030.
What does this mean for exporters to Denmark?
Check your ERP or invoicing software. Ask your software vendor when NemHandel BIS 4 / Peppol BIS 4.0 will be supported. For most international ERP systems, this will be delivered via a regular software update.
Check your Peppol Service Provider. Ask your Peppol Service Provider about their BIS 4.0 roadmap. Use our comparison tool to compare Service Providers on their support for the Danish market.
No B2B mandate for Denmark. Denmark does not have a mandatory B2B e-invoicing requirement for private transactions — that is expected around 2030 under ViDA. The November 2028 deadline concerns the format to be used, not a new invoicing obligation for private-sector transactions.
- VATupdate: Denmark to Adopt Single Peppol E-Invoicing Standard by 2029 (25 June 2026)
- Global VAT Compliance: Denmark Peppol transition consultation supports single e-invoicing standard
- OpenPeppol: Denmark country profile
- VATupdate: Denmark Plans Shift to Peppol BIS E-Invoicing Standard by 2029 for EU Alignment (20 March 2026)
