What it is
Nemhandel ("easy trade") is Denmark's national infrastructure for exchanging structured business documents — primarily e-invoices — between businesses and with the public sector. It is developed and operated by Erhvervsstyrelsen (the Danish Business Authority), and it has been the backbone of Danish public-sector e-invoicing since 2005, long before Peppol existed. For an ERP vendor, Nemhandel is the Danish equivalent of France's Chorus Pro/PPF or Italy's SdI: the network you must connect to in order to deliver invoices to Danish counterparties.
Nemhandel is built on a four-corner model. Senders and receivers each connect through an access point; documents are routed between access points and addressed using a central registry. That registry — Nemhandelsregisteret (NHR) — is the piece ERP developers interact with most: it maps a recipient's identifier (typically a Danish CVR number, an EAN/GLN location number, or a Peppol participant ID) to the endpoint and document types that recipient can receive. Crucially, NHR is itself a Peppol Service Metadata Publisher (SMP), so Danish participants are discoverable from the wider Peppol network, and it is integrated with the CVR business registry — functionality a commercial SMP does not offer out of the box, and it is free to use.
Why it matters for e-invoicing
Denmark's 2022 Bookkeeping Act (Bogføringsloven) requires businesses to use certified digital bookkeeping systems capable of sending and receiving structured electronic invoices via Nemhandel, in either OIOUBL or Peppol BIS 3.0. The B2B obligation is phased in from 2026: financial companies of any size and personally-owned businesses with annual turnover above DKK 300,000 in both 2024 and 2025 are in the first wave from 1 January 2026. This is what turns Nemhandel from a public-sector channel (mandatory B2G since 2005) into something every Danish-facing ERP must support.
The strategic picture shifted sharply in early 2026. The long-planned OIOUBL 3.0 was formally cancelled in January 2026. Instead of evolving its national format, Denmark committed to migrating the whole network onto a localised version of Peppol BIS 4, branded NemHandel BIS 4, with Danish national extensions. The current OIOUBL 2.1 format is expected to be phased out by July 2029, ahead of the EU's ViDA (VAT in the Digital Age) Digital Reporting Requirements deadline of July 2030. For vendors, the practical takeaway is to build against Peppol BIS, not to invest further in OIOUBL-only tooling.
How ERP vendors encounter it
Three integration surfaces matter:
Relation to EN 16931
Both OIOUBL and Peppol BIS Billing 3.0 are CIUS/profiles aligned with the European semantic standard EN 16931. The same business terms (BT-*) you populate for a German XRechnung or a Peppol invoice carry over; what changes for Denmark is the routing layer (NHR/Nemhandel eDelivery) and a handful of Danish-specific rules. A vendor that already emits EN 16931-conformant UBL through a Peppol access point is most of the way to Nemhandel compliance — the remaining work is registry lookup, the MitID/OCES certificate setup, and the Danish extension rules.