UK confirms Peppol for mandatory e-invoicing from 2029

The UK has confirmed that Peppol will form the core network for its mandatory e-invoicing regime from April 2029, giving businesses and software providers a clear basis for planning.

The decision marks a significant step in the government's push to introduce structured digital invoicing across the economy. It follows the launch of a stakeholder co-design phase and places Peppol, the Pan-European Public Procurement On-Line network, at the centre of invoice exchange under the new rules.

For finance teams, the announcement removes one of the main policy uncertainties. Many companies have relied on emailed PDF invoices or existing electronic data interchange links as substitutes for digital invoicing, but the UK mandate is expected to require a standardised, machine-readable format instead.

The policy comes amid concern over the VAT gap. HMRC's latest figures put it at 6.6% of tax due, up from 5.0% a year earlier, and the government sees digital transaction-level reporting as one way to improve transparency and compliance.

Existing network

Peppol already has a foothold in the UK public sector. Since 2018, the NHS has required suppliers to exchange orders, invoices and credit notes over Peppol, while public bodies covered by the Procurement Act must be able to accept invoices that comply with the EN16931 standard.

That track record means the network is not entirely new for government suppliers. Some private-sector businesses already maintain live Peppol connections because they sell into public procurement frameworks. Companies have also been able to use the network voluntarily for business-to-business invoicing where both parties agree.

The wider rollout, however, will bring in organisations that have not previously worked with structured invoice formats. For many, the biggest challenge may be not sending their own invoices, but receiving compliant invoices from a broad supplier base with differing levels of digital maturity.

AppZen, which advises on tax and invoicing systems, said inbound invoice handling is likely to be the main operational challenge for many groups. It advised companies to map how many suppliers can already send structured invoices through Peppol and identify smaller or overseas suppliers that may not be ready.

Scope questions

Several design details remain unresolved. Finance and tax teams are waiting for clarity on the exact scope of the mandate, especially for cross-border transactions involving multinational groups, overseas suppliers invoicing UK entities, and UK businesses billing customers abroad.

Those questions turn on issues such as establishment, VAT registration and place of supply. The government is also expected to set out the specific UK data standard, the accreditation process for becoming a UK Peppol access point, and how older systems that do not readily interoperate with the network will be treated.

Another open question is how broad the document scope will be. In many Peppol regimes, the obligation extends beyond invoices to credit notes, adjustment documents and, in some cases, self-billing arrangements. That could create additional work for sectors where self-billing is common, including automotive, utilities and media.

The e-invoicing rules will sit alongside Making Tax Digital for VAT rather than replace or extend it. That distinction matters for finance departments that may assume earlier digital tax work has already covered the core compliance effort.

Digital storage requirements are likely to be another practical issue. Businesses will need to retain a legal record of the structured invoice itself for the standard six-year VAT retention period, not just a PDF version rendered for human reading.

Preparation work

AppZen said finance leaders should prepare for a substantial implementation effort once the formal roadmap is published. It said chief financial officers should ask now whether existing enterprise resource planning and invoicing systems can connect to a Peppol access point or whether an additional bridging system will be needed.

Accounts payable teams should also review the quality of invoice data, including tax codes, VAT registration numbers and line-item information, because structured invoicing formats generally require cleaner, more consistent source data than email-based processes.

Procurement teams, meanwhile, may need to start discussing readiness with key suppliers and build Peppol requirements into onboarding and contract renewals. That would reduce the risk of trying to retrofit an entire supplier base close to the deadline.

The OpenPeppol UK Working Group is developing the data standard that will underpin the mandate. Set up to create a UK-specific invoice specification, the group brings together service providers, industry specialists and government stakeholders.

Dorcas Mbwiti, Senior Product Manager - European Tax & E-invoicing, AppZen, said: "The confirmation provides every function with enough certainty to begin."