W System / Blog / UK e-invoicing from 1 April 2029: the HMRC roadmap for software

UK e-invoicing from 1 April 2029: what the HMRC roadmap means for invoicing software

By Zifeng Wei, W System · Published 28 October 2026 · All articles

In short: The UK government published its e-invoicing implementation roadmap at Budget 2026 on 28 October 2026. From 1 April 2029, VAT-registered persons must issue VAT invoices to other UK VAT-registered persons as e-invoices and be able to receive them. Peppol is the core interoperability framework, reached through certified Access Points. What is still open, and when it gets decided: the technical standards and Access Point certification (consultation in Spring 2027), accepted business identifiers, exemptions and taxpayer obligations (October 2027 to April 2028), and any accreditation for software providers (Spring 2028). Real-time reporting is not part of the 2029 mandate; a separate consultation on possible future digital reporting runs until 20 January 2027. If you build invoicing, accounting or ERP software for UK businesses, you can plan around Peppol and EN 16931-style data today, and wait for the UK specifics before you finalise.

Timeline from the roadmap

When	What happens
Decided	VAT invoices must be issued as e-invoices from 1 April 2029, and every VAT-registered person must be able to receive them. Peppol is the UK's core interoperability framework (announced at Tax Update 2026).
Finance Bill 2026	Primary legislation giving the power to mandate e-invoicing; expected to become law in Spring 2027. Secondary legislation with the detailed rules may not finish until Autumn 2028 or early 2029.
28 Oct 2026 – 20 Jan 2027	Separate HMRC consultation on possible future e-invoicing digital reporting. No decision taken; it does not change the 2029 mandate.
Spring 2027	Public technical consultation on the UK e-invoicing standards and on Access Point certification requirements. Decision on the long-term home of the UK Peppol Authority (today inside NHS Supply Chain).
Autumn 2027	Guidance on EDI and legacy systems.
End of 2027	Guidance for specific populations, for example people who cannot use digital tools.
Oct 2027 – Apr 2028	Final requirements: scope, exemptions, standards, accepted business identifiers, software provider requirements, taxpayer obligations, updated VAT guidance, the digital-exclusion exemption process. At least 12 months' notice before the mandate.
Spring 2028	Software Provider Management requirements: whether extra authorisation, accreditation or assurance applies to software providers, including those that are not Access Points.
Summer 2028	Readiness testing with software providers.
Winter 2028	Infrastructure and governance operational; providers complete onboarding and accreditation.
1 Apr 2029	Mandate starts. Software providers in the UK regime are expected to have completed any required accreditation with the UK Peppol Authority.

The roadmap says any changes to the requirements after April 2028 will be kept to a minimum, and that there is no need to begin implementing before the detailed requirements are published.

Who and what is in scope

Required: taxable supplies between UK VAT-registered persons where a VAT invoice is required today under VAT Notice 700, section 16. That covers businesses, sole traders, partnerships, charities and public bodies registered for VAT.
Receiving: every VAT-registered person must be able to receive e-invoices from 1 April 2029.
Not required: sales to consumers, cross-border supplies (e-invoices only by agreement), and invoices from businesses that are not VAT-registered. Those can still use e-invoicing voluntarily, and the standards are meant to allow it.
Non-established taxable persons (foreign businesses registered for UK VAT) follow the same rules as UK businesses for UK-to-UK supplies.
Exemptions will be tightly defined: for digitally excluded persons (Making Tax Digital for VAT already has similar exemption criteria) and for technical points where existing VAT invoicing rules do not fit e-invoicing. Details of the digital-exclusion exemption are due by April 2028.
Not an e-invoice: PDFs, Word documents, images, HTML invoices in a web page or email, and faxes. An e-invoice is structured data exchanged between the two parties' systems.
Penalties will build on the existing VAT invoicing penalties framework.

Network: Peppol, Access Points and the UK Peppol Authority

Businesses will usually reach Peppol through their software provider, which either runs its own certified Access Point or uses a third-party one. Access Point certification goes through OpenPeppol, plus any UK-specific requirements set by the UK Peppol Authority (the Peppol Authority Specific Requirements, covering identifiers, security, reporting on network activity, service levels, local interoperability and accreditation). The Authority sits inside NHS Supply Chain today, because the NHS has used Peppol for years; a decision on its long-term home is due in Spring 2027. The roadmap says the Authority will not receive copies of VAT invoices.

The roadmap does not describe a clearance model or a five-corner reporting flow like France's or Ireland's: invoices go from the supplier's system to the buyer's through the Peppol network, and whether HMRC later receives invoice data is the subject of the separate digital reporting consultation.

Checklist for invoicing, accounting and ERP builders

Plan to receive first: from 1 April 2029 every VAT-registered user must be able to receive e-invoices, not just your large customers.
Build on Peppol BIS Billing 3.0 (UBL, EN 16931) now and keep the UK-specific rules configurable until the final standards are published (October 2027 to April 2028).
Decide whether you will run your own Access Point or partner with one. Watch the Spring 2027 consultation on Access Point certification and the Spring 2028 decision on accreditation for software providers that are not Access Points.
Store a business identifier for every customer and supplier, and keep the field flexible: the accepted UK identifiers are only due between October 2027 and April 2028.
Flag which invoices are VAT invoices between UK VAT-registered parties (in scope), and which are consumer, cross-border or non-VAT invoices (out of scope, voluntary).
If your customers use EDI, plan for them to also exchange through the Peppol framework; HMRC's guidance comes in Autumn 2027.
Join the Spring 2027 technical consultation. HMRC's engagement address is [email protected], and responses to the digital reporting consultation go to [email protected] by 20 January 2027.

Testing UK-bound invoices today

Disclosure: W System, which publishes this page, makes the e-invoice API mentioned here. Until the UK standards exist, the closest test is the international Peppol BIS Billing 3.0 rule set. You can drop a UBL or CII file into the free e-invoice validator, or post it to /einvoice/validate; /einvoice/create builds a Peppol BIS 3 UBL invoice from JSON. GET /einvoice/route?id=GB… checks whether a UK company is already on Peppol under scheme 9932 (UK VAT number; the Peppol Directory listed about 22,800 UK participants on 28 October 2026) and returns the UK roadmap dates. W System does not yet check UK VAT numbers live: GB numbers currently return member_state_unavailable and are not billed while HMRC API access is pending. W System is not a Peppol Access Point. Free for 20 calls a day per IP; details on the e-invoice API page. Not tax advice.

curl -X POST "https://api.wsystem.dev/einvoice/validate" -H "Content-Type: application/xml" --data-binary @invoice.xml

Questions and answers

When does e-invoicing become mandatory in the UK?

From 1 April 2029. VAT-registered persons, including public bodies, will have to issue VAT invoices as e-invoices when they supply another VAT-registered person in the UK, and must be able to receive e-invoices, unless a specific exemption applies. The roadmap published on 28 October 2026 sets the steps to get there.

Is Peppol mandatory in the UK?

The government has adopted Peppol as the UK's core interoperability framework. Businesses will typically reach it through a certified Access Point run by their software provider. The roadmap does not say other channels are banned; it says businesses using EDI can keep it alongside the framework but must also be able to exchange e-invoices through it, with guidance due in Autumn 2027.

Which format will the UK require?

Not decided yet. The roadmap says the standards will build on established international standards, including those used within Peppol, with a limited number of UK-specific requirements. A public technical consultation on the proposed standards follows in Spring 2027, and the final standards are due between October 2027 and April 2028.

Does the UK mandate include B2C or cross-border invoices?

No. Sales to consumers do not need VAT invoices, so no e-invoice is required. Cross-border supplies are also out, because VAT invoices are not required there, though businesses may send e-invoices by agreement. Non-VAT-registered businesses can use e-invoicing voluntarily.

Will HMRC require real-time reporting of invoices?

Not as part of the 2029 mandate. HMRC opened a separate consultation on possible future e-invoicing digital reporting, running from 28 October 2026 to 20 January 2027, and says no decision has been taken on whether to introduce it. The roadmap also says the Peppol Authority will not receive copies of VAT invoices.

Do software providers need accreditation?

Access Points must be Peppol-certified, and the government is deciding whether extra UK requirements apply to all software providers in the regime, including those that do not run an Access Point. The decision is due in Spring 2028, and providers are expected to have completed any required accreditation with the UK Peppol Authority by 1 April 2029.

What business identifier will UK e-invoices use?

Not decided. Every participant will need a business identifier as part of its Peppol participant identity. The UK has no single identifier for all organisation types, and the decision on which identifiers are accepted is due between October 2027 and April 2028.

Sources

Checked against the roadmap and the digital reporting consultation on GOV.UK on 28 October 2026, the day they were published.

Facts checked 2026-10-28. W System is the maker of this product. Not affiliated with the European Commission. Not legal or tax advice.