UK e-invoicing mandate 2029. We've got your back.

Your one-stop-shop for the UK e-invoicing mandate. Find out how to get ready for 2029 with the mandate-ometer tool, our dedicated ebook and a series of focused blogs.
state of play

Where things stand now

What's been announced, what's still to be decided and what a finance team can reasonably plan around.

Now

Consultation complete

HMRC and the Department for Business and Trade ran a 12-week consultation from February to May 2025

October 2026

Autumn budget

On 28 October 2026, HMRC is due to publish its implementation roadmap

April 2029

Mandate live

E-invoicing becomes mandatory for all UK B2B finance departments

What it means for you

The same deadline lands differently on every desk

What the CFO needs to know

This is a cash flow and compliance question before it's a technology one. From April 2029, VAT invoices must be issued in a specified electronic format, not just a PDF. That's not a problem though, PDFs aren't going anywhere, they just need a provider turning them into the structured wrapper the mandate wants.
Treat it as a project, not a panic: Open ECX customers go live in 4-6 weeks.
Businesses that start now aren't doing more work than the ones who hold off, they're just capturing the benefit sooner.
You don't need a new ERP to comply. No system migration to explain upward, just a straightforward budget line: readiness, not a rebuild.

What the Head of AP needs to know

Your world is volume, exceptions and the team: how many invoices land, how many need a human to untangle, and who's left doing it. Your suppliers, PDF senders included, can carry on sending invoices exactly the way they always have, we handle the format work behind the scenes so it's not you or your team chasing it down.
Volume isn't the bottleneck it
used to be: we process 98% of Arco's orders and invoices in under 70 seconds.
Structured data means 100% accuracy: invoices match line by line against POs and goods recieved notes, with no re-entry.
For suppliers on Peppol, that's just adding an ID. For everyone else, we connect them, zero changes to their systems.

What the IT / ERP owner needs to know

Peppol connectivity sits alongside your ERP, not inside it. The right provider handles sending and receiving structured data over the network, so your systems don't have to change. Your questions are integration, data quality and change control, so pick a route that plugs into what you already run.
Open ECX loves your existing ERP. We're a recognised Peppol Access Point that connects to what you've got, no disruption, no lengthy integration project
Every invoice is validated against the required structured format before it reaches your ERP, with a full audit trail from receipt to processing
When the mandate's technical detail changes, we absorb it on our side. No new project, no changes to your ERP, no disruption to your existing change-control process.
2029 e-invoicing mandate full ebook preview image open ecx
Free download

Mind the Gap: the full guide to the 2029 e-invoicing mandate

This page helps you see the gap. The guide shows you how to close it, written for CFOs, AP leads and ERP owners. 11 pages, no gated fluff.
What's confirmed, what's still open, and dates to plan for
The readiness principles that matter, plus a quick self-check you can run today
The cost case for acting now, cost, risk and the margin maths your board will want

How Open ECX fits in

We automate e-invoicing as an accredited Peppol Access Point, built to flex as mandate rules change, while cutting costs and protecting your margins.

01
Any format in, compliant data out
PDF, paper, EDI or XML: we turn every invoice into Peppol-ready structured data your ERP can read.
02
We connect you to your suppliers
Whether they send PDFs, paper, EDI or Peppol E-invoices we do the work to onboard your suppliers.
03
Your ERP stays exactly where it is
We connect with what you've already got, no disruption, no lengthy integration project, and most customers go live in 4-6 weeks.
Plain English

E-invoicing jargon, decoded

Get the terms straight and every conversation gets shorter, whether you're briefing the board or a supplier who's never heard of Peppol.

Peppol

A secure international network and set of standards for exchanging trading documents like invoices directly between buyers' and suppliers' systems, already widely used across Europe. Read our full Peppol guide here to understand how it works with e-invoicing.

PDF vs E-invoice

A PDF is built for human eyes, not machines. Straight out of your supplier's finance system, the data's already digital, just stuck in the wrong wrapper. That's why it doesn't count as an e-invoice on its own, and why it's not going anywhere either: keep the PDFs coming, we'll read the data straight out and turn it into what the mandate needs. Read more on PDF vs E-invoicing.

Structured data

Information organised in a fixed, predictable format that software can read and process automatically, rather than a document a person has to interpret and key in by hand. It's the difference between a spreadsheet and a photo of one.

‍

Continuous transaction controls (CTCs)

A model where invoice data gets reported to the tax authority in close to real time, rather than filed after the fact. The 2029 UK mandate doesn't include this, HMRC has confirmed e-invoicing data won't need real-time reporting at launch. Whether a CTC-style requirement gets added later is still being explored, and the Peppol-based model we're building on is designed to add that kind of functionality without starting over, if it ever does.

Questions
Got a question we haven't covered?
Send it to our team and we'll give you a straight answer.
Is e-invoicing mandatory in the UK?

Yes, from April 2029. The government confirmed at Autumn Budget 2025 that all VAT invoices for business-to-business (B2B) and business-to-government (B2G) transactions must be issued in a specified electronic format. Consumer (B2C) invoices are out of scope, and most businesses that aren't VAT-registered won't be obliged to take part.

What is the UK e-invoicing mandate timeline?

HMRC's consultation ran from February to May 2025. Autumn Budget 2025 confirmed the April 2029 start, and Peppol was named the core network in June 2026. HMRC's implementation roadmap is due at Budget 2026 on 28 October 2026, with full guidance, technical specifications and legislation by the end of 2027–28.

Does a PDF count as an e-invoice?

No, HMRC's consultation response says invoices in PDF or Word format, images, HTML invoices in an email and scanned documents are not e-invoices. An e-invoice is structured data exchanged directly between the supplier's and buyer's finance systems, so it can be processed without anyone retyping it.

What is Peppol, and do I need to join it?

Peppol is an international network and set of standards for exchanging e-invoices between different systems. It runs in more than 90 countries, and NHS suppliers in England already use it. The UK named Peppol the core network for the mandate in June 2026. Most businesses connect through a certified Peppol access point provider rather than building their own connection.

Does the e-invoicing mandate apply to small businesses?

The mandate covers VAT invoices, so VAT-registered businesses of every size are expected to be in scope. The government has said many of the smallest businesses that aren't required to register for VAT, and choose not to, won't be obliged. No turnover threshold or phased rollout has been announced yet.

How should finance teams prepare for the e-invoicing mandate?

Start with a supplier audit: how each supplier invoices you today, whether by PDF, paper, portal or EDI. Next, check whether your ERP can send and receive structured data, choose a Peppol-ready provider and onboard suppliers in waves. Going live with OpenECX typically takes around six weeks, so starting well before 2029 leaves room to do it properly.