The 2029 mandate has been policy since Budget 2025, and the network, Peppol, was confirmed in June 2026. What has been missing is the rulebook: who goes first, which standard, which legal route, and what happens if you get it wrong. The government promised that rulebook, in the form of an implementation roadmap, for Budget 2026 on 28 October.
This page sets out what was promised, each open question and what the possible answers mean in practice. It is updated as the roadmap documents are read. For the background on the mandate itself, start with our UK e-invoicing mandate 2029 guide.
What the government said the roadmap would contain
The commitments are spread across four documents. In their own words:
- Budget 2025: "The government will work with stakeholders to develop an implementation roadmap to be published at Budget 2026."
- Overview of tax legislation and rates, Budget 2025: "an implementation roadmap and standards for e-invoicing to be published at Budget 2026. This will give business time to prepare. We will also explore ways to support businesses with this transition."
- Consultation response, 26 November 2025: support for businesses "will form a key part of the implementation roadmap, including ensuring that the UK regime supports the development of low cost, easy to use e-invoicing solutions", and the government "will ensure the timelines for publishing full standards and guidance in advance of the mandate are well understood."
- HMRC transformation roadmap update, July 2026: the roadmap "will set out the milestones to implementation in April 2029 and build on co-creation work taking place with industry representatives in 2026."
Read together, the safe expectation is a dated plan to 2029 and a timeline for the technical standards. The finished PINT UK specification itself is less likely on the day. The OpenPeppol UK Working Group has an 18-month mandate that started in late 2025, and the only published PINT UK artefact is a concept demonstration that is explicitly not an official specification.
The open questions
| Question | Position going in | What to look for |
|---|---|---|
| Start date | "From April 2029" (Budget 2025). No day set in law | A fixed day, and whether receiving starts before sending |
| Phasing | Not signalled. "All VAT invoices" reads as one date | Turnover thresholds, or a B2G-first stage |
| Who is in scope | VAT invoices, B2B and B2G. B2C out | Non-UK suppliers, exempt supplies, low-value invoices |
| Standard | EN 16931 baseline, PINT UK in draft | Whether PINT UK is named, and when it is final |
| Peppol Authority | No national UK authority. NHS England's sits with NHS Supply Chain | Whether HMRC takes on the role |
| Access points | No UK accreditation published | A UK accreditation or certification scheme |
| Legal route | Not stated | Finance Bill clause, regulations, or new powers |
| Penalties | Discussed in 2026 workshops, nothing published | Fixed fines, per-invoice fines, a tolerance period |
| Existing EDI | "Continue to engage" on legacy systems | Whether EDI invoices stay valid, and until when |
| Real-time reporting | Not in 2029, may follow later | Any date or design for later reporting to HMRC |
| SME support | Promised: low-cost solutions and guidance | Free tools, grants, or a public directory of providers |
Start date and phasing
Budget 2025 said "from April 2029, businesses will be required to issue all VAT invoices as e-invoices." The consultation response recorded respondents who wanted a phased start, beginning with the public sector, and others who argued a single date is easier because "having one date where all VAT invoices must be issued electronically removes this challenge." The government did not pick a side.
Several vendor sites describe a confirmed phased rollout with large businesses first. We found no official source for that. It may turn out to be right, but until the roadmap says so it is a guess.
Why it matters: if there is one date, every VAT-registered business that invoices other businesses has the same deadline and the provider market gets crowded in late 2028. If larger businesses go first, smaller suppliers will still feel it early, because their large customers will start asking for structured invoices before the law requires them to send any.
Receive before send
Every EU mandate so far has required businesses to be able to receive e-invoices before they must issue them. Germany required receipt from January 2025 and issuing from 2027. France required everyone to receive from September 2026. If the UK follows the pattern, the first obligation could be on accounts payable, not accounts receivable.
Why it matters: receiving is the cheaper half to switch on, but it changes your supplier invoice process. A structured invoice that lands and still goes to a person for keying has met the rule and saved nothing.
The standard and PINT UK
The baseline is the European standard EN 16931, which UK public bodies already accept under section 67 of the Procurement Act 2023. On top of that, the OpenPeppol UK Working Group is drafting a UK specification, PINT UK, to carry domestic VAT rules. The consultation response left open whether the UK adopts an existing standard or designs its own extensions for specific sectors.
Why it matters: the CustomizationID in each invoice tells the receiver
which rulebook it follows. If PINT UK becomes the requirement, software that
only produces Peppol BIS Billing 3.0 will need an update. Ask providers which
they will support, and by when.
Peppol Authority and access point accreditation
Most Peppol countries have a Peppol Authority that sets local rules and oversees access points. The UK does not have a national one. OpenPeppol lists NHS Supply Chain Coordination Ltd as the authority for the NHS in England, under an agreement originally signed by the Department of Health and Social Care, and all 18 UK-based certified providers are certified directly under OpenPeppol. Nothing has been published on whether HMRC will become the UK authority, or on how UK access points will be accredited.
Why it matters: if HMRC introduces its own accreditation, a provider that is a certified Peppol access point today may still need UK approval. That is a reason to keep access point contracts short until the scheme is known. Our guide to whether you need a Peppol access point covers the options.
Penalties and the legal route
April 2029 is policy, not law. The roadmap is expected to say how the requirement will be legislated. HMRC's 2026 policy workshops covered fraud prevention and penalty frameworks, but no figures have been published.
For comparison, Belgium fines from 1,500 euros for lacking the means to send and receive e-invoices, after a three-month tolerance period. France charges 50 euros per non-compliant invoice and 500 euros per e-reporting failure, each capped at 15,000 euros a year.
Existing EDI and supplier portals
This is the question that matters most to large retail, grocery and construction supply chains, which already exchange invoices as EDI or through buyer portals. In June 2026 the government said only that it "will continue to engage with stakeholders regarding the role of legacy systems which cannot interoperate in the future system." Germany allowed EDI invoices to continue until the end of 2027 as a transition.
Why it matters: if EDI invoices are allowed to continue, many suppliers to the big grocers already comply. If they are not, every EDI invoice flow needs a Peppol route as well, and that work falls on whoever runs the EDI connection.
Real-time reporting
The consultation response was clear that real-time reporting to HMRC "will not be implemented in 2029 but would be implemented once e-invoicing use was well established", and that any future reporting "will build on e-invoicing infrastructure." Look for any date or design. A later move to a five-corner model, where invoice data also goes to HMRC, would change what your access point needs to do.
How other countries structured their roadmaps
The UK roadmap will likely borrow from what came before. These are the levers other countries used.
| Belgium | Germany | France | Ireland | |
|---|---|---|---|---|
| Receive before send | No, same day | Yes, 2025 then 2027 | Yes, September 2026 | Reported, from 2028 |
| Phasing | None | Turnover above 800,000 euros first | Large and mid-size first, SMEs 2027 | Large companies first, November 2028 |
| Small-invoice exemption | No | Up to 250 euros | No | Not confirmed |
| EDI transition | No | Until end of 2027 | No | Not confirmed |
| Tolerance period | Three months | Not formal | Rest of 2026 | Not confirmed |
| Network | Peppol | None mandated | Approved platforms | Not confirmed |
| Reporting to tax authority | Planned for 2028 | No | Yes | Yes, with phase 1 |
The pattern is consistent: receiving first, a threshold or phasing by size, some grace for existing EDI, a tolerance window, and reporting added later. The UK has already ruled out reporting in 2029. Expect the roadmap to choose from the rest.
Where UK businesses are starting from
HMRC's own research, published in March 2026, surveyed 800 small and medium-sized businesses:
| Measure | Share of SMEs |
|---|---|
| Use e-invoicing in any form | 29% |
| Send e-invoices | 15% |
| Send invoices as PDF by email | 95% |
| Receive invoices as PDF by email | 98% |
| Still receive some paper invoices | 78% |
| Did not recall any HMRC messaging on e-invoicing | 91% |
| Use Sage | 48% |
The interviews behind the survey found widespread confusion between e-invoicing and emailed PDFs. Most businesses that think they already e-invoice do not, in the sense the mandate means. Nearly half of the SMEs surveyed run Sage, which is why we wrote a separate guide on Sage and Peppol in the UK.
What to do in the week after the Budget
- Read the roadmap for your answer, not the headline. Check the start date for your size of business, whether receiving comes first, and whether your invoice types are in scope.
- Ask your finance system provider for a dated plan. Not "we will be ready". A version number and a date for the standard the roadmap names.
- Check your EDI and portal invoice flows against what the roadmap says about legacy systems. These are the flows most likely to need a second route.
- Count your customers' VAT numbers. Peppol routes on identifiers. For UK businesses that is normally the VAT number (scheme 9932) or a GS1 GLN (scheme 0088). Every customer without one on file will fail at routing.
- Keep provider contracts short until any UK accreditation scheme and the final standard are known.
The part the roadmap will not cover
The mandate is VAT law, and a purchase order creates no VAT event. Whatever the roadmap says about invoices, it will say nothing about the orders those invoices are matched against. In 2029 a UK supplier's invoice will be validated XML, while the purchase order it is matched to will often still be a PDF attached to an email.
When the PO number, quantities or prices on the invoice do not match the order, automated matching fails no matter how compliant the XML is. That is the side OrderSync works on: it reads emailed, PDF and EDI purchase orders and posts them into your ERP as structured orders, so the data your invoices are built from is right in the first place. We explain the gap in Peppol solved the invoice, nobody solved the order.
Sources
- Budget 2025, HM Treasury, 26 November 2025
- Budget 2025: overview of tax legislation and rates, HMRC, paragraph 2.34
- Promoting electronic invoicing across UK businesses and the public sector: consultation response, HMRC and Department for Business and Trade, 26 November 2025
- Tax Update 2026: simplification, modernisation and fairness, HM Treasury, 23 June 2026
- HMRC transformation roadmap: update 2026, HMRC, July 2026
- Electronic invoicing: SME usage and attitudes, HMRC, 26 March 2026
- UK eInvoicing mandate expected in 2029, OpenPeppol, March 2026
- Peppol Authorities, OpenPeppol
- E-invoicing in Belgium from 1 January 2026, Loyens and Loeff
- Ireland sets timeline for mandatory B2B e-invoicing, Comarch