What is Peppol e-Invoicing?

A traditional invoice can be a paper document, a PDF, or a Word file. It is meant for human eyes. An e-invoice is a structured XML file that machines can read, validate, and book automatically. A PDF attached to an email is not an e-invoice, even though it is electronic. The key difference is structure: e-invoices follow a defined schema (like UBL 2.1) so every field has a precise, machine-readable location.

Peppol originally stood for Pan-European Public Procurement OnLine, the name of an EU pilot project that ran from 2008 to 2012 to simplify cross-border public procurement. The project was funded by the European Commission under the Competitiveness and Innovation Framework Programme. The acronym is no longer expanded in current usage: today Peppol is simply a proper noun, written without all-caps. It is governed by OpenPeppol AISBL, a non-profit international association based in Brussels that took over the specifications when the original EU project ended.

In plain English, Peppol is an open international network that lets any business send a structured electronic invoice (or order, despatch advice, catalogue) to any other business or government on the network, without having to set up a custom connection with each trading partner. You connect to it once, through a certified Access Point, and from then on you can reach every other participant. Peppol defines both the format the document must use (Peppol BIS Billing 3.0, based on UBL 2.1 and the European EN 16931 standard) and the way it travels (the AS4 transport profile and a four-corner delivery model).

Peppol uses a four-corner model. The seller sends an invoice from their system to their Peppol Access Point (corner 2). That Access Point routes it through the Peppol network to the buyer's Access Point (corner 3), which delivers it to the buyer's system (corner 4). The invoice is a UBL 2.1 XML document that conforms to Peppol BIS Billing 3.0. Before sending, the Access Point validates the document against EN16931 and Peppol schematron rules.

Every participant on the Peppol network has a unique Participant Identifier, made of a four-digit scheme code and a value (often based on the VAT number or the national company register number). When the seller's Access Point wants to deliver a document, it queries the Service Metadata Locator (SML), a DNS-based directory operated by OpenPeppol. The SML returns the URL of the Service Metadata Publisher (SMP) holding the recipient's metadata. The SMP returns the recipient Access Point's endpoint URL, the document types it supports, and its public certificate. The sender then transmits the document directly to that endpoint over AS4. All of this happens in seconds, behind the scenes.

It depends on the country. Belgium has mandated structured e-invoicing via Peppol for all B2B transactions since 1 January 2026 (the tolerance period ended on 31 March 2026 and penalties now apply). Italy has had mandatory e-invoicing since 2019, but via the centralised SDI system rather than Peppol. France is rolling out its mandate from September 2026 using Peppol-aligned PDP platforms. Germany requires structured e-invoices in EN 16931 format for all B2B since January 2025, with sending obligations phasing in through 2027 and 2028. Norway and Australia have mandatory B2G via Peppol. The EU's ViDA reform will require near real-time digital reporting for cross-border B2B by 2030. See the full mandates by country reference for the current state per jurisdiction.

You don't register with Peppol directly. You connect through a certified Peppol Access Point provider who handles the network registration. Your business gets a Peppol Participant ID (typically based on your VAT number) that other parties use to send you documents. Your Access Point manages the technical connection.

Peppol is a set of standards and an interoperability framework for exchanging business documents electronically. The name originated as an acronym during an EU pilot project, but today Peppol is simply a proper noun. It is governed by OpenPeppol, a non-profit association based in Brussels. The network connects buyers and sellers through certified Access Points, using standardized document formats to ensure any sender can reach any receiver regardless of their software.

Peppol is available in over 30 countries, including all EU/EEA member states, Australia, New Zealand, Singapore, Japan, and others. However, both sender and receiver must be registered on the Peppol network through an Access Point. Adoption is highest in Scandinavia, Benelux, and Australia.