E-invoicing in the UK:
the 2029 mandate

The UK is changing how businesses invoice each other. At Budget 2025, the government announced that all VAT invoices must be issued as e-invoices from 2029, and HMRC's Transformation Roadmap update in 2026 put the date at April 2029. In June 2026 it announced the network the system will run on: Peppol. The detailed rules, including the exact invoice format and the milestones before the start date, are due in a roadmap at Budget 2026.

This hub brings together everything that has been confirmed so far, in plain English, with every fact taken from GOV.UK. Where something has not yet been decided, we say so rather than guess. The guides listed below go deeper on each topic.

What e-invoicing is

E-invoicing is the exchange of invoice data directly between the seller's and the buyer's financial systems, even when those systems are different. The invoice arrives as data, such as the invoice number, the VAT number, each line and the totals in labelled fields, and goes straight into the buyer's accounts without anyone retyping it.

That rules out the way most small businesses invoice today. The government's response says invoices in PDF or Word formats, images such as JPEG, HTML invoices on a webpage or in an email, and invoices scanned by OCR or sent by fax are not e-invoices for this purpose. The guide on e-invoices versus PDF invoices explains the difference in detail.

The timeline so far

The UK mandate guide follows each step and will be updated as the roadmap is published.

What is confirmed and what is not

Who it affects

VAT invoices are issued for sales between businesses (B2B) and to the public sector (B2G) where VAT is due. They are not issued for sales to consumers. So in practice the mandate reaches VAT-registered businesses that sell to other businesses or to public bodies, and every VAT-registered business as a receiver of invoices from its own suppliers, since invoices must be issued and received electronically.

The government's response is explicit about the smallest businesses: as e-invoicing will be mandated for VAT invoices, many of the smallest businesses, which are not required to register for VAT and choose not to, will not be obliged to adopt it. The VAT registration checker shows where you stand against the £90,000 threshold, and the guides on who is in scope, e-invoicing if you are not VAT registered and why consumer sales are excluded cover the detail.

Micro businesses were the largest group of business respondents, which is one reason the government's response returns repeatedly to cost, simplicity and support for the smallest firms.

How it will work: Peppol and access points

The UK has chosen a decentralised model. Instead of every invoice passing through a government platform, as in Italy, businesses exchange e-invoices directly through service providers they choose. In June 2026 the government announced that Peppol, an international network already used by the NHS and across Europe and Asia-Pacific, will be the core interoperability network.

In practice, you will send invoices from your accounting or invoicing software, which will either be a Peppol access point itself or connect to one. Your customer uses their own software and provider, and the two providers exchange the invoice over the network. You do not need the same software as your customers. The guides on Peppol, access points and Peppol BIS Billing 3.0, the invoice format Peppol uses today, explain each piece.

Why the government is doing it

The response sets out the case in numbers drawn from research and respondents:

It also points to tax accuracy: error accounted for 15% of the overall tax gap in 2023 to 2024, and invoices read by software rather than retyped leave less room for mistakes. And it argues that e-invoicing only pays off when trading partners use it too, which a voluntary approach has not achieved elsewhere.

E-invoicing and Making Tax Digital

E-invoicing is separate from Making Tax Digital (MTD), but the two point the same way: digital records, kept in software, flowing straight into tax returns. MTD for Income Tax began in April 2026 for sole traders and landlords with qualifying income over £50,000, with lower thresholds following in 2027 and 2028. The government's response says respondents saw working alongside MTD as a way to make adoption easier, and that several MTD software providers already offer e-invoicing. The guide on e-invoicing and MTD explains how they fit together, and the MTD requirement checker shows when MTD reaches you.

What will not change

It is easy to read "mandatory e-invoicing" as a bigger change than it is. Several things stay exactly as they are:

• What a VAT invoice must contain. The legal content, such as the invoice number, tax point, VAT numbers and VAT amounts, still comes from the VAT rules. E-invoicing changes the format and delivery, not the substance.
• Your pricing and payment terms. You still set your prices, payment terms and due dates, and business customers who pay late still owe statutory interest.
• Sales to consumers. Receipts and invoices to the public are outside the mandate.
• VAT returns. You still file VAT returns through Making Tax Digital; the government has said e-invoicing data alone would not be enough to pre-fill a VAT return.

How the UK compares

E-invoicing has been in use for over two decades, and the UK is following a well-trodden path. Italy, Brazil and Chile are among the countries that mandate it, Italy through a central government platform. Belgium made B2B e-invoicing compulsory from 1 January 2026 using Peppol. Singapore, New Zealand and Australia began with voluntary Peppol-based systems; the government notes that Singapore and New Zealand are now moving towards mandates for some transactions. Its research found that countries without a mandate have generally not achieved significant take-up, which is why the UK chose one date for all VAT invoices rather than a voluntary scheme or a phased roll-out.

What to do now

Nothing is required yet, and there is no penalty for waiting for the rules. But a few steps cost nothing and make the switch easier:

1. Check whether you are VAT registered, or likely to be, before April 2029.
2. Invoice from software, not word processor templates, so every invoice already exists as data.
3. Tidy your data: consistent invoice numbers, customers' legal names, addresses and VAT numbers.
4. Ask your software provider about its plans for e-invoicing and Peppol.
5. Watch for the Budget 2026 roadmap, which will set out the milestones.

The preparation checklist for sole traders turns this into a step-by-step plan, and choosing e-invoicing software covers what to look for in a provider.

How TapTax fits in

TapTax is Making Tax Digital software for sole traders and landlords, and it already keeps your invoices and income as digital records. We are following the e-invoicing roadmap closely and will explain what changes for TapTax users as the standards are published. In the meantime, the guides here and the wider invoicing guides cover everything you need to invoice well today, including how to send an invoice and what a VAT invoice must show.

Keeping this hub up to date

The rules are still being written, so this hub and every guide in it are reviewed whenever the government publishes something new: the Budget 2026 roadmap first, then the technical standards and guidance that follow it. Each page shows the date it was last reviewed, and every fact links to its GOV.UK source, so you can always check the original for yourself.