Peppol in the UK:
what the announcement means

For most of 2025 and early 2026, the biggest open question about UK e-invoicing was which network it would run on. Consultation respondents had argued for Peppol, the international network already used across Europe and Asia-Pacific, but the government kept its options open. On 23 June 2026, in its Tax update 2026, it answered: Peppol will be the core interoperability network for e-invoicing in the UK. This guide explains what that means in practice, what it does and does not settle, and what UK businesses should do now. For a plain definition, see the Peppol glossary entry.

What the announcement says

The announcement is short. The government said that the electronic procurement system Peppol will be the core interoperability network for e-invoicing in the UK; that this gives software developers and taxpayers the direction of travel so they can plan products and roll-out; and that it will continue to engage with stakeholders about the role of legacy systems that cannot interoperate in the future system.

"Core" is doing work in that sentence. It signals that Peppol is the backbone every compliant system must be able to use, while leaving room for the government to decide how other systems, such as older enterprise systems or existing networks, fit alongside it.

Why Peppol

The consultation response shows how strongly respondents pushed for it. A significant proportion called for alignment with international frameworks such as Peppol and for common formats already in use in the UK and EU, and Peppol was frequently cited as the preferred solution for cross-border trade. Multinational businesses, often already working under mandates abroad, recommended a Peppol four-corner or five-corner model. Respondents saw it as a network that enables interoperability, provides standard protocols and formats, and can handle cross-border transactions.

The alternative, a UK-only network, would have meant building new infrastructure and leaving UK businesses on a different system from their trading partners abroad. Choosing Peppol aligns the UK with countries that already use it and lets UK software providers reuse what they have built for other markets.

More than a third of respondents also operate in the EU, where Peppol is widely used, which helps explain the appetite for a network that works across borders.

Peppol in the UK today

The UK is not starting from scratch. NHS Supply Chain requires its suppliers to issue e-invoices through the Peppol network, and OpenPeppol lists NHS Supply Chain Coordination Ltd as the Peppol Authority for England, the body that oversees the network locally. Bodies covered by the Public Procurement Act 2023 must accept e-invoices that comply with the European standard EN 16931, the standard Peppol's invoice format is built on. And several UK software providers already offer Peppol sending and receiving, including some that serve small businesses.

How it will work for a UK business

In Peppol's four-corner model, you and your customer each use a service provider called an access point:

You do not need the same software or provider as your customer, and you do not connect to the network yourself. The guide to Peppol access points covers choosing a provider.

A fifth corner, sharing invoice data with the tax authority in real time, is used in some countries. The UK government has said it will not introduce real-time reporting alongside the 2029 mandate, although it may consider it later, building on the e-invoicing infrastructure.

Peppol elsewhere: what the UK can learn

The consultation response notes that Peppol-based models are being implemented in many EU countries, as well as in Singapore, Malaysia and Australia. Belgium is the closest recent example: it made structured e-invoicing compulsory between Belgian VAT-registered businesses from 1 January 2026, with Peppol as the default network. Singapore, New Zealand and Australia built Peppol systems on a voluntary basis first; the government's research found that voluntary regimes generally did not achieve significant take-up, and notes that Singapore and New Zealand are now moving towards mandates for some transactions. The UK has chosen to go straight to a mandate with a long lead time.

What the announcement does not settle

The invoice format. Peppol carries invoices in formats called Business Interoperability Specifications. The main one, Peppol BIS Billing 3.0, follows the European standard EN 16931. The government's response said it would review the risks and benefits of adopting an existing standard or designing a UK-specific one, including possible extensions for sector-specific needs. That decision is still to come.

Legacy systems. Some businesses, particularly larger ones, run older finance systems or private networks that cannot connect to Peppol directly. The government has said it will continue to engage on their role.

Identifiers. Every business on Peppol has a participant identifier, typically based on an existing number. How UK businesses will be identified, for example by VAT number, has not been announced.

Everything in the roadmap. Milestones, penalties, guidance and support are due in the roadmap at Budget 2026. The UK mandate guide tracks them.

A worked example: a VAT-registered consultant

Aisha is a VAT-registered management consultant who invoices three clients: a housing association, an engineering firm and an NHS trust. Today she emails each a PDF. The NHS trust already asks her to invoice through Peppol, so her accounting software sends that one through its access point, and the other two still get PDFs.

From April 2029, all three invoices are VAT invoices and must be e-invoices. Because her software already connects to Peppol, the change is small: the software finds each client on the network, and from then on every invoice goes the same way as the NHS one. Her clients' own software and providers do not matter to her. Her supplier bills, for software, travel and her accountant, start arriving as e-invoices too, and go straight into her records.

Nothing about what she charges, her payment terms or what the invoice must say changes. What changes is the delivery: no more "we never received it", and invoices that land in her clients' systems ready to approve. The guide on e-invoices versus PDF invoices explains the difference in detail.

Security and fraud

The government sees the network as a defence against invoice fraud, a known problem for many businesses. Invoices shared through secure systems are harder to fake than emailed PDFs, and automated checks can flag, for example, an invoice that asks for payment to a bank account not previously associated with that supplier. Consultation respondents also called for strong cyber security, data protection and digital identity standards, and the government has said it will consider appropriate security standards for e-invoice transmission as part of the design work.

Choosing software with Peppol in mind

The practical question for most businesses is not "how do I join Peppol?" but "does my software do it?" When you review your invoicing or accounting software, ask whether it is an accredited Peppol access point or partners with one, whether it both sends and receives, what it costs, and whether it commits to the UK requirements once they are published. The guide to choosing e-invoicing software sets out a full checklist, and the e-invoicing glossary entry defines the terms.

What UK businesses should do now

• If you supply the NHS or a public body that asks for Peppol invoices, you may need an access point now, whatever the mandate.
• If you are VAT registered, ask your software provider whether it is, or will be, a Peppol access point, and what it will cost.
• If you are choosing new software, prefer a provider with a clear Peppol plan.
• If you are not VAT registered, you are not obliged to adopt e-invoicing under the mandate as announced; the VAT registration checker shows where you stand.
• For everyone, keep invoicing from software, with clean customer details and consistent invoice numbers from the invoice number generator.

Common questions

Is Peppol run by HMRC? No. It is governed by OpenPeppol, a non-profit international association under Belgian law, with national Peppol Authorities overseeing it locally.

Will HMRC see my invoices through Peppol? The four-corner model exchanges invoices between businesses. Real-time reporting to HMRC is not planned for 2029.

Can I keep emailing PDFs? For VAT invoices, not after April 2029: PDFs are not e-invoices under the plans. For consumer sales and businesses outside the mandate, nothing changes.