UK: HMRC publishes B2B e-invoicing implementation roadmap from April 2029

HM Revenue & Customs (HMRC) has published its long-awaited roadmap for the implementation of mandatory electronic invoicing (e-invoicing), providing the clearest indication to date of how the future regime will operate. The roadmap confirms that, from April 1, 2029, VAT-registered persons will generally be required to issue and receive VAT invoices electronically using a structured data format.

The initiative represents a significant milestone in the UK's digital tax transformation agenda and confirms that the UK will adopt a Peppol-based interoperability model rather than a government clearance system. The roadmap also establishes a multiyear implementation plan intended to provide taxpayers and software providers with sufficient time to prepare before the mandate becomes effective.

Scope of the mandate

The e-invoicing obligation will apply to VAT invoices issued between VAT-registered persons when a VAT invoice is required under existing UK VAT rules. The mandate will therefore primarily affect domestic business-to-business (B2B) and public sector transactions involving VAT-registered entities.

Importantly, the new requirements will go beyond simply issuing invoices electronically in formats commonly used today. PDFs, Word documents, image files, and invoices sent by email will not qualify as e-invoices. Instead, invoices will need to include structured data capable of being exchanged directly between the financial systems of the supplier and customer.

HMRC confirmed that the obligation will extend to non-established taxable persons (NETPs) registered for UK VAT. Consequently, foreign businesses that are registered for UK VAT and make taxable domestic supplies to VAT-registered customers in the UK will also be required to issue and receive e-invoices.

The requirement will not generally apply to transactions when a UK VAT invoice is not required, including most B2C transactions, supplies involving non-VAT-registered businesses, certain cross-border transactions, and transactions involving taxpayers benefiting from a digital exclusion exemption. Organizations may, however, continue to use e-invoicing voluntarily for transactions outside the mandatory scope. The mandate is not intended to change the underlying UK VAT rules governing when a VAT invoice must be issued or the information it must contain. Rather, it will digitize the existing VAT invoicing process by changing the format in which VAT invoices are issued and exchanged.

HMRC also intends to introduce a limited exemption for VAT-registered persons that are unable to use digital technologies, building on the existing Making Tax Digital exemption framework. Further details are expected by April 2028.

Peppol confirmed as the UK's e-invoicing framework

A key outcome of the roadmap is confirmation that the UK will implement mandatory e-invoicing through a Peppol-based four-corner interoperability model.

Under this approach, VAT invoices will be exchanged directly between trading partners through certified Peppol Access Points, allowing businesses to continue using different enterprise resource planning (ERP), accounting, and invoicing platforms while maintaining interoperability. Unlike clearance-based models adopted in several jurisdictions, invoices will not be submitted to, validated by, or routed through HMRC as part of the transaction flow.

For most businesses, this is not expected to require a direct connection to the Peppol network. Instead, connectivity is likely to be managed through their accounting, finance, or e-invoicing software provider. Businesses will therefore need to ensure that their chosen software or service provider supports the future UK requirements and is capable of exchanging invoices with their trading partners.

The roadmap also confirms that HMRC will become the UK's Peppol Authority, replacing the current governance arrangement under the NHS Supply Chain. In this role, HMRC will oversee UK-specific Peppol requirements, Access Point standards, and overall interoperability governance.

Importantly, HMRC expressly stated that it will not receive copies of invoices solely because they are exchanged through the Peppol network, reinforcing that the UK's model is designed as a decentralized interoperability framework rather than a tax clearance or transaction-reporting regime. As a result, the UK approach is more closely aligned with developments in Belgium and Germany than with clearance-based systems such as those operated in Italy, Poland, or Saudi Arabia.

Business case for e-invoicing

The UK government presents e-invoicing primarily as a business modernization initiative rather than a tax enforcement measure. According to HMRC, the policy is intended to improve productivity by enabling automation, reducing manual processing, improving invoice quality, reducing fraud risks, and supporting faster payment cycles.

The government estimates that late payments cost the UK economy approximately £11 billion annually, while small and medium-sized enterprises spend an average of 86 hours each year chasing overdue invoices. HMRC expects that the automation enabled by structured electronic invoicing will reduce administrative burdens, improve cash flow, and support wider digitization initiatives, including Making Tax Digital.

Key implementation milestones

The roadmap provides a phased implementation schedule leading up to the April 2029 go-live date:

• Spring 2027 – Consultation on the technical framework and introduction of enabling legislation
• October 2027 to April 2028 – Publication of detailed requirements, including scope, exemptions, technical standards, business identifiers, software provider obligations, and compliance guidance
• Summer 2028 – Readiness testing begins
• Winter 2028 – Governance, onboarding, and operational infrastructure become fully available
• April 1, 2029 – Mandatory e-invoicing becomes effective

The government intends to confirm the detailed e-invoicing requirements between October 2027 and April 2028, providing affected businesses and software providers with at least 12 months to prepare ahead of the April 1, 2029, mandate. The government has also indicated that any changes to the requirements after April 2028 will be kept to a minimum and made only where necessary following stakeholder feedback.

Technical standards and software provider requirements

The future UK framework will be based on international Peppol standards, with only limited UK-specific requirements where necessary. HMRC intends to publish detailed specifications covering invoice data structures, validation rules, business identifiers, and implementation guidance.

Software providers will be subject to a formal governance and compliance framework that includes Access Point certification, security obligations, interoperability requirements, service quality standards, and any UK-specific accreditation requirements. Participating providers are expected to complete all required certification and onboarding activities before the mandate takes effect.

HMRC also intends, as far as possible, to use the existing VAT invoicing penalties framework as the basis for its approach to non-compliance with the future e-invoicing requirements. Further details on taxpayer obligations, compliance, and supporting guidance are expected by April 2028.

Outstanding decisions

One of the most important policy decisions that remains outstanding concerns the business identifiers that will be accepted within the UK Peppol ecosystem. Because the UK does not have a single universal business identifier, HMRC will determine the accepted identifier framework between October 2027 and April 2028. The selected approach will be central to participant registration, identification, and invoice routing across the network.

The roadmap also confirms that organizations currently using electronic data interchange (EDI) networks, proprietary B2B platforms, or other legacy invoicing arrangements are expected to be able to continue using these systems alongside the future UK framework. However, they will need to ensure that they are capable of exchanging invoices through the UK's Peppol-based network for transactions subject to the mandate. Further policy and technical work will determine how this will operate in practice, with additional government guidance expected in fall 2027.

Digital reporting and related digital compliance initiatives

The roadmap confirms that the UK's April 2029 mandate is limited to mandatory e-invoicing and will not initially include invoice clearance, continuous transaction controls (CTCs), or real-time reporting to HMRC. However, alongside the roadmap, HMRC launched a public consultation on e-invoicing digital reporting, seeking stakeholder input on whether data generated through e-invoicing could be used in the future to support tax administration. HMRC has emphasized that no decisions have been made regarding the introduction of digital reporting and that the consultation is intended solely to inform future policy development.

At the same time, the government confirmed that it will proceed with the introduction of mandatory software standards for electronic point of sale (EPOS) and mobile point of sale (MPOS) systems as part of its efforts to combat electronic sales suppression (ESS), with a technical consultation expected in summer 2027. Together, these initiatives indicate that although the immediate focus remains the implementation of mandatory e-invoicing by April 1, 2029, HMRC is pursuing a broader digital tax administration strategy aimed at improving data integrity, reducing opportunities for tax evasion, and supporting the future modernization of compliance and reporting processes.
 

For more information, contact a KPMG tax professional:

Tania Segovia Tornero | Tania.SegoviaTornero@kpmg.co.uk

Marc Belooussov | Marc.Belooussov@kpmg.co.uk

Philippe Stephanny | philippestephanny@kpmg.com

Ramon Frias | ramonfrias@kpmg.com