If you've been watching the mandate conversation and waiting for clearer direction before acting, this is it. The direction of travel is confirmed. As an accredited Peppol Access Point and co-chair of the UK Peppol Working Group, we've been building toward this moment for years. Here's what it means for your business.

What did HMRC actually announce about the Peppol network?

As part of the Tax Update 2026: Simplification, Modernisation and Fairness policy paper, HMRC confirmed that Peppol (Pan-European Public Procurement OnLine) will be the interoperability framework underpinning the UK's e-invoicing system.

The government's stated aim is to give "software developers and taxpayers an indication of the direction of travel for our work towards the e-invoicing mandate in 2029, enabling them to begin planning their product development and rollout of e-invoicing."

It's the first time HMRC has explicitly named Peppol in a formal policy document, and it quickly landed in the industry press, including the Purchase to Pay Network. It's a meaningful step up from the original mandate announcement.

It's worth noting: the full technical standards for the mandate haven't been confirmed yet. So the right framing for now is that the April 2029 mandate is expected to proceed and Peppol is confirmed as the network it will run on. Watch this space for the technical detail.

What is Peppol e-invoicing and why does it matter for UK businesses?

Peppol is a global network that lets businesses and governments securely exchange electronic documents, without needing bespoke integrations between each pair of trading partners. Think of it as the postal system for structured business data: one network, common standards, any sender to any recipient.

It started as a European initiative but now operates across more than 90 countries. Australia, Singapore, New Zealand and most of Europe already mandate or strongly encourage it for government and business-to-business transactions.

The UK joining that framework matters because it means your e-invoicing solution needs to be built on Peppol, not just vaguely "digital." A PDF sent by email needs to be transformed into structured data.

We are here to help, Open ECX became an accredited Peppol Access Point and is primed to help you meet the mandate.

What does this mean for legacy AP systems?

HMRC specifically flagged this in the announcement: the government "will continue to engage with stakeholders regarding the role of legacy systems which cannot interoperate in the future system."

That's a polite way of saying: if your current AP setup can't connect to the Peppol network, it has a problem. Most legacy AP tools weren't built with Peppol in mind, and closing that gap takes time.

This is exactly where Open ECX comes in. We're an accredited Peppol Access Point and have been part of the UK Peppol Working Group since the beginning. We connect your existing finance setup to the Peppol network without you having to rip anything out.

What should you do now?

The honest answer is: start the conversation now, not in 2028.

Here's why timing matters more than most finance teams realise. Supplier onboarding takes time. Getting 50, 200, or 2,000 suppliers onto a new invoicing network isn't a switch you flip in Q4. The businesses that will hit 2029 in good shape are the ones that start the groundwork in 2026 and 2027.

A few things worth doing right now:

Check whether your current ERP or AP system has confirmed Peppol connectivity. If the answer is "we're working on it," that's a risk to track.

Understand your supplier base. How many suppliers are already on Peppol? How many are sending PDFs? Our community of 17,000+ active trading parties means many of yours may already be connected.

Get a readiness assessment in place. Not a 40-page report, just a clear picture of where you are versus where you need to be.

Our e-invoicing readiness guide for finance teams is a good starting point.

Where does this leave the wider mandate timeline?

The April 2029 date holds. This announcement supports it, rather than replacing it. What's changed is the level of specificity: we now know what network the UK is building on, which means vendors, ERPs, and finance teams can make decisions with more confidence.

HMRC is still working through the full technical standards. We'll cover those as they land. In the meantime, the smart move is building on Peppol because that decision is no longer speculative.

What does a Peppol Access Point actually do?

A Peppol Access Point is an accredited gateway between your business and the Peppol network. Rather than building a direct connection to every trading partner individually, you connect once through your Access Point and can exchange compliant e-invoices with any other business on the network, anywhere in the world. Think of it as the postal sorting office for structured invoice data: you hand over your document, it handles the routing.

Open ECX has been accredited as a Peppol Access Point, co-chairs the UK Peppol Working Group, and has an active community of 17,000+ trading parties already on the network. If you want to understand what the Peppol confirmation means for your specific setup, we're happy to walk you through it.

No deck. No sales pitch. Just a straight conversation about where you are and what needs to happen before 2029.