What does PEPPOL stand for and how does it work?

Peppol stands for Pan-European Public Procurement Online, though today it is almost always written simply as Peppol. It is a standardised international network, governed by the non-profit association OpenPeppol, that lets businesses and public sector bodies exchange documents such as invoices, orders and despatch advice automatically, without re-keying data between systems.

What does Peppol stand for?

Peppol was originally an acronym for Pan-European Public Procurement OnLine. It started as an EU pilot project designed to make cross border public procurement easier. The network has since grown well beyond procurement and well beyond Europe, which is why the full name is used less often today. Most official Peppol material now simply refers to it as Peppol.

Who runs Peppol?

Peppol is governed and maintained by OpenPeppol, a non-profit international association based in Belgium. OpenPeppol sets the technical specifications, accredits the service providers known as Access Points, and maintains the central directories that keep the network working. Individual countries and sectors, such as the UK NHS, then adopt the Peppol framework for their own procurement and invoicing rules.

How does Peppol work? The four corner model explained

Peppol moves documents using what is known as the four corner model. Rather than a supplier and a buyer connecting to each other directly, each party connects to its own accredited Access Point, and the two Access Points handle the exchange between them. Here is how that looks in practice for a UK supplier sending an invoice to a public sector buyer.

1. Corner 1, the supplier. A UK supplier creates an invoice in their accounting or ERP system and sends it to their chosen Peppol Access Point.
2. Corner 2, the supplier's Access Point. The Access Point converts the invoice into the standard Peppol format and validates it against the network's rules.
3. Corner 3, the buyer's Access Point. The message is routed securely across the Peppol network to the Access Point the buyer has chosen, wherever that provider is based.
4. Corner 4, the buyer. The buyer's Access Point delivers the invoice straight into the buyer's own finance or procurement system, ready to process.

Because both Access Points use the same standardised format, the supplier and the buyer never need to agree a shared file format between themselves. Each organisation only has to connect once, to one Access Point, to reach every other participant on the network.

The short video below shows these steps in practice: an invoice created in the supplier's ERP, converted and validated by Transalis as the supplier's Access Point, routed over the Peppol network and delivered into the buyer's own system.

Access Points, the SMP and SML lookup, and the Peppol participant ID

An Access Point is an accredited service provider that connects a business to the Peppol network and handles the technical exchange on its behalf. Businesses do not connect to Peppol directly. They choose an Access Point, and that provider manages the certificates, security and message handling the network requires. Every organisation on Peppol also has a unique Peppol participant ID, which identifies it on the network in the same way an account number identifies a bank account.

When a document is sent, the sending Access Point looks up the recipient using the Service Metadata Locator (SML) and Service Metadata Publisher (SMP), the Peppol directories that record which Access Point each participant uses and which document types they can receive. This lookup step is what lets a message find its destination automatically, without the sender needing to know any technical detail about the buyer's own systems.

What document formats does Peppol use?

Invoices sent over Peppol follow a common specification called Peppol BIS Billing 3.0, which is based on the European standard EN 16931. The same standardised approach covers other business documents too, so the network is not limited to invoicing.

• eInvoices, using the Peppol BIS Billing 3.0 format
• Purchase orders
• Despatch advice, confirming what has been shipped
• Catalogues
• Message level responses, confirming a document has been received

Because every participant uses the same formatting rules, a document sent from one accounting system arrives in a shape the receiving system already understands, with little or no manual re-keying.

Where is Peppol used?

Peppol began as an EU initiative but is now used well beyond it. In the UK, the NHS has required many of its suppliers to trade via Peppol for years, and other parts of the public sector accept Peppol invoices too. In the EU, Belgium's business to business eInvoicing mandate runs on Peppol, and adoption is growing across the rest of Europe as national mandates arrive.

Beyond Europe, Peppol is used in countries including Australia, New Zealand, Singapore and Japan, and more governments are adopting it for public sector and business to business invoicing.

What this means for UK retail and supply chain businesses

In the UK, Peppol has mostly been a public sector story so far, driven by NHS and wider government requirements. That is starting to change. As more EU trading partners move to Peppol based invoicing, UK suppliers selling into those markets increasingly need a Peppol connection alongside their existing retail supply chain relationships.

A supplier that already trades through EDI with UK retailers does not need a second system to add Peppol. The same Access Point connection can carry both, so a business can meet a public sector buyer's Peppol requirement and keep sending orders, despatch advice and invoices to its retail partners exactly as before.

Peppol and the UK's 2029 eInvoicing mandate

The UK's own eInvoicing mandate builds directly on Peppol. The government has announced that from April 2029, eInvoicing will be mandatory for UK business to business and business to government trade, with business to consumer transactions exempt. It will use the same decentralised four corner Peppol model described above, so a business already connected through an Access Point is already using the technology the mandate is built on.

The rollout happens in three stages: co-design during 2026, build and data cleansing work in 2027 to 2028, and go live in 2029. The detailed implementation roadmap and technical standards are due at Budget 2026 on 28 October 2026. There is no real time HMRC clearance step in the initial phase.

Rather than a compliance deadline to fear, the mandate is best treated as a trading passport: connect once and a business is ready to trade with any other Peppol connected organisation, in the UK or abroad. For the full timeline, read our guide to the UK eInvoicing changes and the countdown to compliance, and see how the wider UK eInvoicing landscape is developing.

How does a business get onto Peppol?

A business does not need to build its own connection to the Peppol network. Access is provided through an accredited Access Point Provider, which handles the technical protocols, formatting rules and directory lookups on the business's behalf.

Transalis is a certified Peppol Access Point Provider. There are several ways to start: a browser based service with no integration required, Peppol and EDI built into an existing ERP or accounting system, or a fully managed service across a large trading network, all on the same underlying connection. Explore the options on our eInvoicing pages, or book a meeting to talk through what fits.

Peppol vs EDI: what's the difference?

For many UK businesses, Peppol and EDI now sit side by side. A single connection to a provider such as Transalis can cover both, so a supplier can meet a public sector buyer's Peppol requirement and keep its existing EDI trading relationships with retail partners on one platform.