E-invoicing in the United Kingdom

Mandatory E-Invoicing in the UK: What Businesses Need to Know

For a long time, the United Kingdom has not had a general requirement for electronic B2B invoicing. That is about to change. The British government has announced that, starting in April 2029, all VAT invoices for Business-to-Business (B2B) and Business-to-Government (B2G) transactions must be exchanged electronically.

The measure follows a broad consultation conducted by HM Revenue & Customs (HMRC) and the Department for Business and Trade in 2025. The consultation examined standardization, interoperability, the potential role of Peppol, and the relationship between e-invoicing and future real-time VAT reporting.

In 2026, the direction was further defined. Peppol will serve as the core network for interoperability within the future UK e-invoicing system. The precise standards, technical specifications, exceptions, and legal provisions will be further developed in the coming years.

A detailed implementation roadmap is expected with the 2026 Budget. HMRC aims to publish the complete guidance, standards, technical specifications, and legislation no later than the 2027/2028 fiscal year.

What will change starting in April 2029?

Starting in April 2029, VAT invoices for B2B and B2G transactions must be exchanged in a prescribed electronic format. This will make electronic invoicing a requirement for UK VAT compliance.

Currently, UK businesses can still use various forms of electronic invoicing. Under current VAT rules, even a PDF sent via email can qualify as an electronic VAT invoice, provided it meets the requirements for authenticity, integrity, and legibility.

The future requirement goes a step further. The goal is to enable the structured, direct exchange of invoice data between financial systems, thereby reducing manual processing and allowing invoice data to be automatically incorporated into the recipient’s accounting records.

The exact data structure and technical requirements for 2029 have not yet been officially published. However, it is now clear that Peppol will play a central role in the infrastructure.

Is a PDF sent by email considered an e-invoice in the UK?

Under current UK VAT rules, the answer may still be yes. HMRC considers both structured files such as XML and unstructured electronic files such as PDFs to be forms of electronic invoicing.

This distinction is important when considering the future requirement. While a PDF does contain digital information, the invoice data is not necessarily structured in a way that allows it to be processed directly by the recipient’s financial system.

The UK reform, set to take effect in 2029, is specifically aimed at standardized electronic invoice data and system-to-system exchange. This shifts the meaning of e-invoicing toward the definition that is also becoming increasingly common internationally: a structured invoice that can be processed automatically and electronically.

Peppol Will Become the Core Network

In June 2026, the UK government announced that Peppol would become the core interoperability network for the future e-invoicing system.

Peppol is an international network that allows businesses to exchange electronic business documents via certified service providers. A supplier and customer do not need to use the same software vendor or e-invoicing provider.

The model is fundamentally decentralized. The supplier sends an e-invoice via its own service provider. The invoice is then routed through the Peppol network to the customer’s service provider and financial system.

This approach differs, for example, from those in Poland and Italy, where the flow of tax invoices runs through central government platforms such as KSeF and SdI. The United Kingdom, on the other hand, has opted for an interoperable network in which private software and e-invoicing providers play a key role.

The British government is still investigating how existing EDI and other invoicing networks can continue to operate alongside or in combination with Peppol. The final interoperability rules must be incorporated into the further technical implementation.

Which e-invoice format will the UK use?

The final UK e-invoicing standard has not yet been published. During the consultation, there was broad support for aligning with existing international standards and European models, including Peppol.

Since Peppol has now been selected as the core network, the direction has become clearer. However, the exact semantic standard, syntax, mandatory data fields, and any UK-specific extensions have yet to be formally established.

This is relevant for international organizations. Peppol is already in use in various European and non-European countries, allowing the same infrastructure to be deployed across multiple markets. National requirements for invoice data, however, may continue to vary by country.

Will there also be real-time VAT reporting?

Not yet. This is a key difference between the UK’s plans and various European Continuous Transaction Control models.

HMRC has investigated whether e-invoicing can be combined with Real-Time Reporting (RTR), whereby data on individual transactions is provided to the tax authority immediately or nearly immediately.

However, the British government has explicitly stated that real-time reporting will not be introduced at the same time as the e-invoicing requirement in 2029. First, e-invoicing must become widely adopted.

Real-time VAT reporting does remain a possible next step, however. The e-invoicing infrastructure could later be used to share transaction data with HMRC, for example through a model in which, in addition to the supplier, the customer, and their service providers, the tax authority also gains access to relevant data.

The United Kingdom is thus opting for a phased approach: first, standardized e-invoicing, possibly followed later by more transactional VAT reporting.

E-invoicing and Making Tax Digital Are Not the Same Thing

The United Kingdom already has a far-reaching program for digitizing tax administration: Making Tax Digital (MTD).

Since April 2022, in principle, all VAT-registered businesses must maintain digital VAT records and file their VAT returns electronically with HMRC using appropriate software.

However, Making Tax Digital and e-invoicing serve different purposes. MTD focuses on digital record-keeping and the information reported periodically to HMRC. E-invoicing involves the electronic exchange of individual invoices between suppliers and customers.

Starting in 2029, these two developments will converge. Transactions will be further digitized at the source, ultimately making it easier to use invoice data for VAT audits, error detection, and any future real-time reporting.

E-invoicing to the UK government

Electronic invoicing already plays a role in the UK public sector.

For public contracts covered by the Procurement Act 2023, contracting authorities must be able to accept and process compliant, structured electronic invoices. The law defines an electronic format for this purpose that enables automated electronic processing and aligns with the relevant UK e-invoicing standard.

This does not mean that every supplier is currently required to invoice every UK government organization electronically. The existing rules focus primarily on the ability of suppliers to submit a compliant e-invoice and on the obligation of the relevant public organization to process it.

Starting in April 2029, this will change more broadly: VAT invoices for B2G transactions will then also fall under the general UK e-invoicing mandate.

What does this mean for foreign companies?

For international companies, the most relevant aspect is that the UK mandate is linked to VAT invoices. The exact scope, exceptions, and treatment of various international scenarios will be further detailed in upcoming legislation and regulations.

As a result, Dutch organizations with a UK entity or substantial operations in the United Kingdom will have to adopt a new invoicing model starting in 2029. Their financial systems will need to be capable of generating and receiving structured electronic invoices and connecting to the UK’s e-invoicing infrastructure.

Since Peppol has been selected as the core network, this also provides connectivity to a network that Dutch organizations are often already familiar with from e-invoicing in the Netherlands, Belgium, and other countries.

And Northern Ireland?

Northern Ireland occupies a special position within the UK VAT system. Under the Windsor Framework, Northern Ireland remains connected to the European system for certain VAT rules regarding goods.

For example, EU-related VAT rules and the XI VAT number are still used for the movement of goods between Northern Ireland and EU member states. Different rules apply to services and transactions within the UK internal market.

However, the UK’s e-invoicing requirement starting in 2029 is a national UK measure. For organizations with operations in Northern Ireland, the combination of UK e-invoicing rules and the special VAT status under the Windsor Framework must therefore be considered separately.

What does ViDA have to do with the United Kingdom?

The United Kingdom is no longer a member of the European Union. VAT in the Digital Age (ViDA) therefore does not directly apply as a European e-invoicing mandate for the United Kingdom.

The UK’s e-invoicing requirement, set to take effect in 2029, is a separate national initiative and is legally distinct from the European Digital Reporting Requirements, which will apply to relevant cross-border transactions within the EU starting July 1, 2030.

In practical terms, however, the United Kingdom and the European Union are moving in the same direction: structured invoice data, interoperable networks, and further digitization of VAT compliance.

The choice of Peppol is important in this regard. It gives British companies access to an infrastructure that is also used in various EU countries, thereby simplifying electronic exchanges with international trading partners.

For a Dutch corporate group, this means it may simultaneously be subject to UK e-invoicing requirements, national requirements in various EU member states, and—starting in 2030—the European ViDA rules for relevant cross-border transactions.

The UK Roadmap for E-Invoicing

The key steps are:

April 2019: “Making Tax Digital for VAT” is introduced for the first group of VAT-registered businesses.
April 2022: Making Tax Digital for VAT is expanded to, in principle, all VAT-registered businesses.
February 13, 2025: HMRC and the Department for Business and Trade launch a public consultation on the widespread adoption and standardization of e-invoicing.
February 24, 2025: The Procurement Act 2023 takes effect and, among other things, ensures the processing of compliant electronic invoices for relevant public contracts.
November 2025: The British government announces that electronic invoicing will become mandatory for all B2B and B2G VAT invoices starting in 2029.
June 2026: The government designates Peppol as the core interoperability network for the future UK e-invoicing system.
Budget 2026: The government intends to publish the further implementation roadmap and standards leading up to 2029.
2027/2028: HMRC aims to publish the full guidance, standards, technical specifications, and legislation by the end of this fiscal year at the latest.
April 2029: Mandatory electronic invoicing for B2B and B2G VAT invoices.
After 2029: Possible further introduction of real-time VAT reporting; no implementation date has yet been set for this.

What does this mean for organizations?

For organizations operating in the United Kingdom, the most significant change is that e-invoicing will transition from a voluntary method of exchanging invoices to a requirement for VAT compliance.

The exact technical requirements have not yet been finalized, but the direction has now been established. Invoice data will need to be exchanged in a structured format, and Peppol will form the core of the future interoperability model.

In doing so, the United Kingdom is once again opting for a national model that differs from those of several European countries. Belgium uses Peppol for mandatory B2B exchange, France works with accredited platforms, Poland with KSeF, Italy with SdI, and the United Kingdom is developing a decentralized model in which Peppol ensures interoperability.

For international organizations, this underscores that e-invoicing is not limited to a single XML format. The financial infrastructure must be able to support various national data models, networks, tax rules, and future reporting requirements.