Electronic invoice in Denmark

NemHandel framework with OIOUBL/Peppol formats – B2G mandatory

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Overview

Denmark is the country most often misdescribed in e-invoicing coverage. It has been exchanging structured business documents through NemHandel since 2005 and public bodies have had to accept EN 16931 invoices since 2019 — yet there is no general B2B mandate requiring every domestic invoice to be electronic, and no real-time VAT reporting.

What Denmark did instead is unusual and, in practice, just as consequential. Through the Bookkeeping Act it made e-invoicing capability compulsory: nearly every business must run a digital bookkeeping system that can send, receive and store electronic invoices. The obligation attaches to the system, not to the individual transaction — and the result is a market where structured invoicing has become the norm without ever being ordered.

Two networks

NemHandel eDelivery and Peppol eDelivery run side by side

No clearance

no tax platform in the path, no real-time VAT reporting mandate

Four identifiers

CVR, SE, P-number and GLN — recipients may choose freely

Timeline

Denmark's path is a long, quiet build rather than a single mandate date. Two threads run in parallel: the public-sector infrastructure, and the bookkeeping rules that pulled the private sector along with it.

Already in force

2005

NemHandel becomes the public-sector channel

Electronic exchange of business documents with Danish public authorities becomes obligatory, making Denmark one of the earliest movers in Europe.

18 April 2019

Public buyers must accept EN 16931

Implementation of Directive 2014/55/EU. Contracting authorities must receive and process invoices compliant with the European standard, alongside the national OIOUBL format.

1 July 2024

Digital bookkeeping — first wave

Companies with an annual reporting obligation that use a system registered with the Danish Business Authority must comply from financial years beginning on or after this date.

1 January 2025

Digital bookkeeping — non-registered systems

The same obligation reaches companies using a non-registered or in-house system, which must meet the statutory technical requirements and be formally declared.

1 January 2026

Digital bookkeeping reaches sole traders

Personally owned businesses and associations with a net turnover above DKK 300,000 for two consecutive years are now covered. Sales and supplier invoices may no longer be kept on paper or locally on a computer.

Ahead

2028

Release candidate for Nemhandel BIS 4

The successor format arrives for testing, opening the active migration window. See formats and the BIS 4 migration for what changes.

Mid-2029

OIOUBL 2.1 is retired

Migration completes and the requirement for bookkeeping systems to support OIOUBL is removed.

1 July 2030

ViDA digital reporting

Intra-EU cross-border B2B transactions must use an EN 16931 compliant e-invoice, with a subset of the data reported at EU level.

B2G and NemHandel

Selling to a Danish public body means invoicing electronically through a solution connected to NemHandel or Peppol. This has been settled practice for two decades, and the tax authority's own guidance for businesses states it plainly.

NemHandel

The Danish national eDelivery network, developed by the Danish Business Authority. Better suited to national documents and processes, and integrated with MitID.

Peppol

The international network, better suited to foreign trading partners and with global reach. The Danish Peppol Authority is the Danish Business Authority (ERST).

Denmark treats these two as one shared digital infrastructure rather than as competitors. A recipient registered in the NemHandel register can be reached from either side, and service providers in the shared infrastructure are expected to handle both.

The practical consequence of non-compliance in B2G is commercial rather than punitive: an invoice that does not arrive as a structured document through the right channel may simply not be accepted or processed, and payment stalls.

The digital bookkeeping rules

This is the part that catches foreign businesses out. Denmark has no rule saying “every B2B invoice must be electronic”. It has a rule saying your bookkeeping system must be digital and must be able to handle e-invoices — which is a different obligation with a similar effect.

What a compliant system must be able to do

Send and receive electronic invoices and credit notes in OIOUBL and Peppol BIS

Store accounting records and supporting documents digitally, safely and in a recoverable form

Support the exchange of bookkeeping data in a standard file format for handover to authorities or auditors

Be either registered with the Danish Business Authority, or a non-registered system that demonstrably meets the statutory requirements

Capability, not obligation

A Danish company still may agree with a customer to send a PDF for an ordinary B2B transaction. What it may not do is run a business on paper invoices in a filing cabinet or spreadsheets on a laptop. The requirement is that the infrastructure exists — and once it does, most companies use it.

Responsibility stays with the business owner even where a bookkeeper or auditor does the actual work. Choosing a system, documenting the accounting procedures in writing and ensuring records are protected are all owner-level duties under the Act.

The technical model

Denmark operates a decentralised four-corner model. The invoice travels from sender to recipient through access points; no tax platform sits in the path and no document is approved before it is delivered. The European Commission describes the Danish B2G model as a NemHandel four-corner model similar to Peppol, and records no real-time VAT reporting mandate for Denmark.

No pre-approval

Unlike Italy's SdI or Poland's KSeF, nothing has to clear a state platform before the customer receives it.

No real-time VAT reporting

VAT returns follow the ordinary periodic route; invoice data is not streamed to the tax authority.

Secured transport

Encrypted exchange between access points, with receipts and application responses confirming delivery.

One connection, both networks

A provider in the shared infrastructure reaches Danish recipients on NemHandel and foreign ones on Peppol.

Under ViDA this picture gains a reporting layer for cross-border transactions from 2030 — but the domestic exchange model itself is not scheduled to become a clearance system. Denmark's published strategy frames the move to Peppol BIS 4 precisely as the way to be ready for ViDA without rebuilding the national architecture.

Formats and the BIS 4 migration

For twenty years the national format has been OIOUBL, a Danish UBL-based syntax. That era is now scheduled to end.

OIOUBL 2.1The historic national format, still required for digital bookkeeping systems and widely used domestically

Peppol BIS Billing 3.0Supported for interoperability and the natural choice for cross-border trade

EN 16931Mandatory for public buyers to accept, and the basis of the ViDA requirements from 2030

Nemhandel BIS 4The successor: Peppol BIS 4 with Danish national extensions

OIOUBL 3.0 has been cancelled

In early 2026 the Danish Business Authority published a document strategy abandoning the planned OIOUBL 3 in favour of Nemhandel BIS 4. A release candidate is expected in 2028, with an active migration period running to mid-2029, after which OIOUBL 2.1 is phased out and the requirement for bookkeeping systems to support it is removed. If your roadmap still assumes an OIOUBL 3 upgrade, it needs revisiting.

What counts as an e-invoice — and what does not

The Danish Business Authority is explicit: PDF, e-mail, JPEG and similar formats that require software to be read are not electronic invoices for the purposes of the Bookkeeping Act. This coexists with a separate VAT rule under which the tax authority accepts invoices in a non-editable format such as PDF. Both statements are true because they answer different questions — one about bookkeeping and NemHandel, the other about VAT documentation.

Endpoint identifiers

Danish recipients may register in the NemHandel register under any of four identifier types, and they choose freely. Service providers in the shared digital infrastructure must therefore be able to send to all four — a requirement that trips up integrations built for a single national identifier.

CVREAS 0184 (DK:DIGST) — the 8-digit Danish business registration number identifying the legal entity

SE numberEAS 0198 (DK:ERST) — the Danish SE number, formatted as DK followed by 8 digits

P-numberEAS 0096 — the Danish production unit number, identifying an individual establishment

GLNEAS 0088 — the 13-digit Global Location Number

Peppol service providers are additionally expected to support sending to whatever identifiers their users' foreign recipients happen to use. Several other Danish endpoint types existed historically but have been deprecated over the years.

Requirements for providers

Denmark is, by European standards, an open market for service providers. There is no national access point licence comparable to the Slovak digitálny poštár, and the Danish Business Authority's own guidance states that no certification or onboarding procedure and no testbed or accreditation process currently exists for operating an access point — “anyone is free to establish an access point”.

Via Peppol: a certified Peppol service provider can serve Danish customers, provided it follows OpenPeppol and Danish Peppol Authority rules, supports the Danish endpoint schemes and validates against the applicable Danish business rules

Via direct NemHandel eDelivery: a MitID business certificate is required. The authority's own FAQ notes that a foreign company may be unable to obtain one directly and would likely need to consider a Danish subsidiary

No requirement was found in the official sources for a Danish legal entity, a local representative or any separate official electronic mailbox in order to operate as a Peppol access point

Note the distinction between two very different things: registration of digital bookkeeping systems with the Danish Business Authority is a real regime with real consequences — but it applies to bookkeeping software, not to access points, and it is not a Peppol licence.

Archiving

Accounting records must be retained for the current financial year plus the five preceding ones. Since the digital bookkeeping rules came in, that retention has to be digital and inside a compliant system.

Sales invoices may no longer be issued on paper or in a word processor and stored physically or locally on a computer

Supplier invoices are subject to the same rule — they belong in the bookkeeping system, not in a folder on a desktop

Records must be protected against loss, theft and destruction, with written procedures describing how that is done

The system must be able to hand the material over in a standard exchange format when an authority or auditor asks for it

Using an external bookkeeper or accounting firm does not transfer the obligation. The business owner remains responsible for compliance, which makes the choice of system a governance decision rather than a purely operational one.

Penalties and VAT deduction

There is no fine for “failing to send an e-invoice” in domestic B2B, because there is no obligation to send one. The enforceable rules sit in the Bookkeeping Act, and they are not trivial.

Up to DKK 1.5 millionThe maximum fine level indicated by the Danish Business Authority for breaches of the digital bookkeeping and system functionality requirements

Scaled by turnoverThe indicative penalty scale depends on company size and the seriousness of the breach

B2G in practiceAn invoice that is not delivered as a structured document through the right channel may not be accepted or processed at all

Is an e-invoice the only basis for deducting VAT?

No. To deduct input VAT a business generally needs proper invoices, simplified invoices, self-billing documents or import VAT specifications as documentation of the purchase and the tax. Danish guidance recognises documents in paper or electronic form as invoices where they meet the VAT Directive requirements.

There is also settled principle that tax authorities cannot refuse a deduction purely because of formal defects in an invoice where they hold the information needed to verify that the substantive conditions are met. In short: the structured e-invoice matters as a bookkeeping and B2G compliance requirement, while the right to deduct is analysed on its own terms.

How we help

Denmark rewards a provider that handles both networks and all four identifiers cleanly, and that is ready for the BIS 4 migration rather than surprised by it. As a certified Peppol Access Point we cover:

Sending and receiving via a certified Peppol Access Point

Peppol BIS Billing 3.0 (UBL 2.1) and UN/CEFACT CII

Addressing to all four Danish endpoint types: CVR 0184, SE 0198, P-number 0096 and GLN 0088

Validation against EN 16931 and the applicable Danish business rules before dispatch

Receipts and application response flows, so delivery and acceptance are traceable

Format conversion from ERP, CSV and IDoc source data

Integration via API, SFTP and CSV

A connection that carries forward into the Nemhandel BIS 4 migration and ViDA

Frequently asked questions

Is B2B e-invoicing mandatory in Denmark?

Not per transaction. There is no general rule requiring every domestic B2B invoice to be sent as a structured e-invoice. What is mandatory is that companies covered by the Bookkeeping Act use a digital bookkeeping system capable of sending, receiving and storing e-invoices in OIOUBL and Peppol BIS. In practice this has made structured invoicing the default, but the legal obligation attaches to the system rather than to the invoice.

Can I still send PDF invoices?

To a private customer who accepts it, yes — a PDF can still function as an invoice for VAT purposes. But a PDF is expressly not an electronic invoice under the Bookkeeping Act, and it cannot be used to invoice a Danish public body. It also cannot be your storage method: invoices have to live in the digital bookkeeping system, not as files on a laptop.

What is the difference between NemHandel and Peppol?

Two eDelivery networks that together form Denmark's shared digital infrastructure. NemHandel is national, developed by the Danish Business Authority, better suited to Danish documents and processes and integrated with MitID. Peppol is international, governed by OpenPeppol with the Danish Business Authority as national Peppol Authority, and is the better route to foreign trading partners. Most businesses never choose between them — their provider handles both.

Do I need a Danish company to operate as an access point?

Not for Peppol. There is no Danish access point accreditation and no local establishment requirement in the official sources; a certified Peppol service provider can serve Danish customers directly. Direct connection to NemHandel eDelivery is different: it requires a MitID business certificate, which a foreign company may not be able to obtain, and the authority's guidance suggests considering a Danish subsidiary in that case.

What is Nemhandel BIS 4 and when do I need it?

It is Peppol BIS 4 with Danish national extensions, chosen as the successor to OIOUBL after the planned OIOUBL 3 was cancelled in early 2026. A release candidate is expected in 2028, with migration running to mid-2029, after which OIOUBL 2.1 is phased out. Nothing needs to change in your systems today — but if a vendor is selling you an OIOUBL 3 upgrade path, that plan no longer exists.

Does Denmark have real-time VAT reporting?

No. The European Commission's country profile records no real-time VAT reporting mandate for Denmark. Invoice data is not transmitted to the tax authority as it is issued, and nothing has to be cleared before delivery. From 1 July 2030 ViDA introduces EU-level digital reporting for intra-EU cross-border B2B transactions, which is a different and narrower obligation.

How long must invoices be kept?

The current financial year plus the five preceding ones. Under the digital bookkeeping rules that storage must be digital, inside a compliant system, protected against loss and theft, and covered by written procedures. Both sales and supplier invoices are in scope.

Summary

Denmark achieved through infrastructure and bookkeeping law what other countries are now attempting through mandates. Public-sector e-invoicing has been compulsory since 2005 and EN 16931 compliant since 2019; the Bookkeeping Act then required nearly every business to run a digital system capable of handling e-invoices, completing its rollout to sole traders in January 2026.

The model stays decentralised: four corners, two networks, no clearance, no real-time VAT reporting. The next real change is technical rather than legal — the migration from OIOUBL to Nemhandel BIS 4, with a release candidate in 2028 and OIOUBL retired by mid-2029.

For a company trading with Denmark the practical checklist is short: be reachable on all four endpoint types, validate properly before sending, keep records inside a compliant system — and pick a provider whose roadmap already accounts for BIS 4.

Resources

nemhandel.dk The official portal for Denmark's shared digital infrastructure, with guides and release news Supported endpoint identifiers in Denmark The official guide to CVR, SE, P-number and GLN addressing Register of approved bookkeeping systems The Danish Business Authority's list of systems registered under the Bookkeeping Act Guidance on the Bookkeeping Act Requirements for digital bookkeeping systems, retention and written procedures Peppol country profile – Denmark The Danish Peppol Authority and the national requirements that apply European Commission – eInvoicing in Denmark Country factsheet confirming the four-corner model and the absence of real-time reporting Peppol Directory Check whether a business partner is reachable on the network

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