What’s NemHandel and when do I need OIOUBL e-invoices?

NemHandel is Denmark’s national e-invoicing infrastructure, managed by Erhvervsstyrelsen and built on top of the European PEPPOL network. The Danish format is OIOUBL (Offentlig Information Online Universal Business Language), a UBL XML profile.

When you need it:

• B2G (mandatory), if you sell to any Danish public body (kommune, region, staten, hospital, university), invoices must be OIOUBL via NemHandel. This has been mandatory since 2005 (Denmark was the EU pioneer here).
• B2B (recommended, increasingly expected), many large Danish B2B buyers prefer NemHandel/PEPPOL e-invoices. EU directive 2014/55 + the 2026 ViDA (VAT in the Digital Age) timeline are pushing this further.

Magento integration: on order invoice generation, render an OIOUBL XML matching the OIOUBL 2.1 schema, route it through a NemHandel / PEPPOL access point (e.g. Pagero, Tradeshift, B2Brouter, Continia, or direct via your accounting system if it supports PEPPOL). We wire the sales_invoice save observer to produce + dispatch the OIOUBL XML, then store the NemHandel acknowledgement back on the invoice.