E-Invoicing in the United Kingdom
Mandatory B2B and B2G e-invoicing from April 2029, decentralised Peppol-style model
The mandate at a glance
The UK confirmed mandatory B2B and B2G e-invoicing from April 2029 at the November 2025 Autumn Budget. The chosen architecture is a decentralised, Peppol-style four-corner model: businesses exchange structured invoices through accredited access points, with no real-time reporting to HMRC in the initial phase.
That last point distinguishes the UK from clearance markets like Italy or Poland: the 2029 mandate is about the exchange of structured invoices between businesses, not (yet) about tax-authority visibility of each transaction. Technical standards and the phasing schedule are due at the November 2026 Budget.
| Date | Obligation | Scope |
|---|---|---|
| November 2026 | Technical standards and phasing published | HMRC / Budget announcement |
| April 2029 | Mandatory B2B and B2G e-invoicing begins | Phased, large businesses first; SMEs follow |
Details beyond the April 2029 start and the phased approach await the 2026 Budget publications.
Required formats and network
Expected format: Peppol-aligned UBL, EN 16931-compatible XML. The UK already runs Peppol in the public sector (mandatory for NHS suppliers since 2020), which makes Peppol BIS the natural technical baseline while HMRC finalises the standards.
Public sector (B2G)
Peppol e-invoicing has been required for suppliers to the NHS since 2020, and public-sector Peppol adoption continues to expand ahead of the 2029 general mandate.
How to comply
- Treat Peppol BIS UBL as the preparation target until HMRC publishes final standards.
- If you supply the NHS or public sector, you likely already have the Peppol connectivity the 2029 mandate will build on.
- Watch the November 2026 Budget for the technical standards and SME phasing.
- Design invoice generation around EN 16931 semantics so the final UK CIUS is a mapping task, not a rebuild.
What InvoiceXML supports for the United Kingdom
Frequently asked questions
When does e-invoicing become mandatory in the UK?
From April 2029, for both B2B and B2G, phased with large businesses first. The phasing details and technical standards are due at the November 2026 Budget.
Will UK invoices be reported to HMRC in real time?
Not in the initial phase. The announced model is invoice exchange through accredited access points without direct e-reporting to HMRC, unlike clearance systems such as Italy's SDI.
Which format will the UK require?
The expected baseline is Peppol-aligned UBL compatible with EN 16931, consistent with the UK's existing NHS Peppol infrastructure. Final standards are due in 2026.
Does the UK mandate affect EU sellers?
UK-established businesses are the primary scope. Cross-border rules will be defined with the technical standards; EU businesses selling into the UK should watch the 2026 publications.
E-Invoicing in the Netherlands →
E-Invoicing in Belgium →
E-Invoicing in Norway →