Country Update — United Kingdom  |  29 June 2026  |  Topic: E-Invoicing / Digital Tax Reporting

In its Tax Update 2026, published on 23 June 2026, HM Revenue & Customs (HMRC) confirmed that the Peppol network will serve as the core interoperability network for e-invoicing in the United Kingdom. The announcement gives software developers and businesses an early, authoritative signal of the architecture that will underpin the planned UK e-invoicing mandate in 2029.

Background

Unlike many EU member states, the UK has not yet mandated structured e-invoicing for B2B transactions. In early 2025, the government and HMRC ran a consultation, “Promoting electronic invoicing across UK businesses and the public sector,” to gather views on standards, models, and the role of mandation. The Tax Update 2026 package, titled “Simplification, Modernization, and Fairness,” is the government’s first concrete commitment on the technical direction of UK e-invoicing.

The Legislative / Policy Change

In the section “E-invoicing: core interoperability network announcement,” the government states that Peppol will be the core interoperability network for e-invoicing in the UK. HMRC explains that this indicates the direction of travel toward the e-invoicing mandate in 2029, enabling developers and taxpayers to begin planning product development and rollout. The government also signaled that it will continue to engage with stakeholders on the role of legacy systems that cannot interoperate with the future system.

Scope

The confirmation is a foundational design decision rather than a binding obligation. It establishes Peppol—the same four-corner exchange framework already used across much of Europe and in public procurement—as the backbone for future UK e-invoicing. Detailed rules on which transactions, taxpayers, and timelines will be in scope are expected to follow as the 2029 mandate is developed.

Timeline

• Early 2025: e-invoicing consultation issued.
• 23 June 2026: Peppol confirmed as the core interoperability network (Tax Update 2026).
• 2029: planned introduction of the UK e-invoicing mandate.

Businesses Affected

In the longer term, UK-established businesses and public sector bodies exchanging invoices domestically are the primary population. In the near term, the most affected groups are ERP and e-invoicing software vendors, accredited access point providers, and large enterprises that will need lead time to align systems—particularly multinationals already operating Peppol elsewhere who can leverage existing capability.

Required Actions

• Map current invoicing systems and identify whether they can connect to a Peppol access point.
• Engage software vendors on Peppol-readiness roadmaps and the treatment of legacy systems.
• Monitor forthcoming HMRC consultations for scope, format, and timeline detail.
• Coordinate UK plans with wider European e-invoicing programs to avoid duplicated effort.

Practical Implications

Naming Peppol reduces a key area of uncertainty and lets organizations begin design work with confidence that their investment aligns with the eventual mandate. It also strengthens interoperability between the UK and EU regimes. Businesses that treat 2029 as distant risk a compressed implementation window once detailed rules and the mandate date are finalized.

Expected Next Steps

HMRC is expected to publish further detail on the e-invoicing model, scope, and exact timeline, alongside continued stakeholder engagement on legacy systems. The Tax Update 2026 also advances several related VAT measures—including a consultation on extending online marketplace VAT liability, a consultation on mandatory Direct Debit for VAT, and the digitization of the option-to-tax process—that together signal a broader modernization of UK indirect tax administration.

How Can KGT Support You?

KGT helps multinational organizations design and operate Peppol-based and SAP-integrated e-invoicing across multiple jurisdictions. As an SAP partner, we support installation, configuration, customization, and training so that UK plans align with wider European compliance programs. If you would like to assess your readiness for the UK’s 2029 e-invoicing mandate in an SAP environment, we are happy to help.

Official sources

• GOV.UK – Tax Update 2026: simplification, modernisation and fairness (summary): View source
• GOV.UK – Promoting electronic invoicing (consultation response): View source

This content is provided solely to enhance knowledge of tax matters. It does not constitute tax advice for any taxpayer because it does not take into account any specific taxpayer’s facts and circumstances.