UK tax rules and two government surveys, read at the source
E-invoicing in the UK: what changes in 2029, and why your PDF invoice won’t count
E-invoicing means sending an invoice as data, from your software straight into your customer’s, instead of as a PDF that someone has to read. In the UK it becomes compulsory for every VAT invoice from April 2029, and the government says the roadmap for getting there comes with the Budget on 28 October 2026. So how ready are small businesses? The government’s Small Business Survey, published on 15 October 2026, says 62% of small employers that use software already e-invoice. HMRC’s own research found 29%, and 95% still sending invoices as PDFs or emails. We read both questionnaires to see why the two numbers are so far apart. Only one of them told people that a PDF doesn’t count.
The short version
- An e-invoice is data, not a document. It goes from the supplier’s software to the customer’s and lands in their accounts without anyone typing it in. On the government’s definition, a PDF, a Word file, a photo or an invoice in the body of an email is not an e-invoice.
- From April 2029, all VAT invoices must be e-invoices. In practice that means invoices between businesses and to the public sector. Invoices to consumers aren’t covered.
- If you aren’t VAT-registered, the government says many of the smallest businesses that don’t have to register, and choose not to, won’t be obliged to adopt it.
- Peppol is the network, named in June 2026, that will let different businesses’ systems exchange e-invoices.
- The next date is 28 October 2026, when the roadmap of milestones is due with the Budget. The standard, the software rules and any phasing aren’t published yet.
- Small firms are further from it than one headline suggests. 62% say they e-invoice in a survey that didn’t define the term; 29% said so when HMRC told them PDFs and emails don’t count.
- What to do now: ask your accounting software provider whether it can send and receive e-invoices over Peppol, and what it plans for 2029. There’s nothing to buy yet.
What is e-invoicing?
HMRC’s research defines it in two sentences: "E-invoices are issued, sent, and received in a structured data format that allows for automatic and electronic processing. This does not include PDFs or emails."
The difference is who the invoice is for. A PDF is a picture of an invoice, made for a person to read. Somebody at your customer’s end opens it and types the supplier, date, amounts and VAT into their accounts, or uses software to read it for them. An e-invoice is the data itself: each of those details arrives as a separate field that the customer’s accounting software can take in directly.
The government’s consultation response puts it this way: "E-invoicing refers to the digital exchange of invoice data directly between buyers’ and suppliers’ financial systems, even when those systems differ." Its consultation document gives the everyday version: "When Business A issues an invoice to Business B, they upload it onto their e-invoicing platform. Business B then receives it via their platform and it automatically enters their accounting software."
Does a PDF invoice count as an e-invoice?
No, not on the government’s definition. The consultation listed what it did not treat as an e-invoice: "invoices in PDF or word formats, images such as JPEG, HTML invoices on a webpage or in an email, OCR or images sent via a fax machine".
That is a definition written for the consultation rather than the final rule, but the rule points the same way. Budget 2025 says: "The government will require all VAT invoices to be issued in a specified electronic format from April 2029." The format itself is what the roadmap and the standards that follow it will specify.
This is why one of HMRC’s numbers matters more than the rest. 95% of the businesses in its survey sent invoices as PDFs or emails, and 80% said that was the way they sent invoices most often. On HMRC’s figures, almost every small VAT-registered business sends invoices in a form that isn’t an e-invoice. From April 2029, the ones that are VAT invoices to other businesses will have to change.
What changes in April 2029
HMRC’s Transformation Roadmap update of July 2026 says: "The government will also mandate e-invoicing for all VAT invoices from April 2029." It adds that HMRC is working with the Department for Business and Trade, as the business department was then called, to "publish an e-invoicing roadmap at Budget 2026 that will set out the milestones to implementation in April 2029".
The Budget is on 28 October 2026. The Chancellor’s letter to the Treasury Committee of 31 July asked the Office for Budget Responsibility to prepare "an economic and fiscal forecast for publication on 28 October 2026. This will be accompanied by the Budget."
| Date | What happened |
|---|---|
| 13 February 2025 | The government consults on promoting e-invoicing (open until 7 May 2025). |
| 26 November 2025 | Budget 2025 announces that all VAT invoices must be e-invoices from April 2029. The consultation response is published the same day. |
| 23 June 2026 | Peppol is named as the core network for e-invoicing in the UK. |
| 2 July 2026 | HMRC’s roadmap update repeats April 2029 and says the e-invoicing roadmap comes at Budget 2026. |
| 28 October 2026 | Budget 2026: the e-invoicing roadmap is due. |
| April 2029 | All VAT invoices must be issued as e-invoices. |
What we know about the rule so far, from the consultation response:
- It is about invoices between businesses. VAT invoices are "typically issued for business to business (B2B) and business to government (B2G) transactions where VAT is due (though not for business to customer transactions)".
- Receiving counts too. The response talks about "requiring all VAT invoices to be issued and received electronically". So even if you send few invoices, the ones your suppliers send you will change.
- Not every small business is in it. "As e-invoicing will be mandated for VAT invoices, many of the smallest businesses who are not required and choose not to be registered for VAT will not be obliged to adopt this technology."
- Invoices aren’t expected to go through an HMRC hub. The government says its work is on a "decentralised" model, with no central hub: businesses send invoices through their own software providers. The government also says it "will not introduce" real-time reporting of invoices to HMRC "alongside the e-invoicing mandate in 2029".
- Peppol is the network. The Tax update of June 2026 says "the electronic procurement system Peppol will be the core interoperability network for e-invoicing in the UK". The point, in the response’s words, is that "whichever provider a business selects, they will be able to automatically issue and receive e-invoices when trading with any other UK VAT registered business".
- Parts of the public sector are already there. The response notes that "all bodies covered by the Public Procurement Act 2023 are required to accept e-invoices which comply with BS EN16931 and NHS Supply Chain requires its suppliers to issue e-invoices through the Peppol network."
And what isn’t settled. The government says it "will develop e-invoicing standards which enable interoperability and balance flexibility and simplicity. This will form a key part of the implementation roadmap." In that response it said it would weigh up adopting an existing standard against designing a UK one, and none of the later documents we read says which. None of the documents we read sets a size threshold, a phased start or penalties. Those are for the roadmap and what follows it.
How many small businesses already e-invoice? It depends who asks
Two government surveys asked small businesses whether they use e-invoicing. They got very different answers.
| Small Business Survey 2025 | HMRC’s e-invoicing research | |
|---|---|---|
| Published | 15 October 2026, by the Department for Business, Innovation, Science and Trade | 26 March 2026, by HMRC (carried out by IFF Research) |
| Who was asked | Businesses with 1 to 249 employees that use software to sell or run the business. 2,042 answered this question. | VAT-registered businesses with fewer than 250 employees. 800 interviews. |
| When | October 2025 to April 2026 | 24 February to 18 March 2025 |
| The question | "Which of the following management technologies do you use?", with "Electronic invoicing (e-invoicing)" read out as one item on a list. No definition. | The definition first, ending "This does not include PDFs or emails.", then "Does your business use e-invoicing or electronic invoicing?" |
| Said yes | 62% | 29% |
The 62% comes from Table 9 of the survey’s data tables: 61% of micro businesses, 66% of small ones and 74% of medium-sized ones. The report lists "electronic invoicing (62%, as in 2024)". It is a share of employers that use software, which was 74% of all small employers in 2025, so across all small employers it is roughly 46%. That last figure is our arithmetic, not the survey’s.
The difference that stands out is the question. We read the survey’s questionnaire (question F11). Two items on that list come with a definition for the interviewer to read "IF NECESSARY". E-invoicing isn’t one of them. One of the two is electronic data exchange, explained as "the electronic transmission of data between organisations which can be automatically processed", which is close to HMRC’s definition of an e-invoice. 20% of the same employers said they use it.
HMRC’s questionnaire read its definition out as part of its first question, so every business answering had just been told that a PDF didn’t count. 29% said yes. HMRC also found:
- 95% send invoices as PDFs or emails, and 98% receive them that way.
- 15% send e-invoices and 24% receive them; 10% do both.
- Only 9% said e-invoicing was the way they sent invoices most often. For 80% it was PDF or email.
Timing doesn’t explain the gap. The previous Small Business Survey, which also found 62%, ran from October 2024 to May 2025, so it was in the field during HMRC’s interviews.
These are different surveys, so they aren’t a before and after. One counts employers that use software, whether or not they’re VAT-registered. The other counts VAT-registered businesses, including those with no staff. Nobody asked either group whether they think an emailed PDF is an e-invoice, so we can’t say how many do. But a survey that never defined the term got more than twice the answer of one that did. That fits with a lot of owners counting an invoice emailed as a PDF from their accounts software as e-invoicing. On the government’s definition, it isn’t.
What to do now
The list is short, because most of the detail isn’t out yet.
- Check whether you’re VAT-registered. If you aren’t, and don’t have to be, the government says you won’t be obliged to adopt e-invoicing. Your suppliers and customers may still use it.
- Ask your accounting software provider two questions. Can it send and receive e-invoices over Peppol today? What is its plan for April 2029? The government says: "We are aware of several MTD providers focused on the small business market that are already able to provide e-invoicing services." (MTD providers make the software used to file VAT returns under Making Tax Digital.)
- Be careful with anything sold as “2029-ready” today. In November 2025 the government said it would weigh up an existing standard against a UK one, and we haven’t found a decision since. Ask which standard a product meets.
- If you invoice the NHS or public bodies, start there. Those customers already accept e-invoices, and NHS Supply Chain already requires them through Peppol.
- Put 28 October 2026 in the diary. That is when the roadmap is due. We will add what it says to this post.
Where e-invoicing saves time
The government’s case is mostly about the work that disappears. An e-invoice "enables invoices to be automatically integrated into the buyer’s system, reducing the need for manual processing and improving efficiency", as the consultation response puts it. Nobody types the supplier, date, amount and VAT in, so nobody types them wrong.
For now, most invoices still arrive as PDFs or emails: 98% of the businesses in HMRC’s survey received them that way. Reading those and posting them into your accounts is a job software can already do, which we covered in how to automate invoice processing.
What argues the other way
- Some of the 62% is real. HMRC found 15% of businesses sending e-invoices and 24% receiving them, and 20% of employers in the Small Business Survey said they use electronic data exchange. The fair reading isn’t that 62% is wrong. It’s that it doesn’t measure what the 2029 rule means.
- The two surveys cover different businesses. One leaves out employers that don’t use software and includes ones that aren’t VAT-registered. The other is VAT-registered businesses only. They can’t be lined up exactly.
- The 2029 rule isn’t written in detail yet. Scope, standards, any phasing and penalties are still to come, and this post will need updating after 28 October.
- We have an interest. Lola Squared builds automation that reads PDF invoices, among other things. E-invoicing will make much of that reading unnecessary for invoices between businesses. That’s a good outcome for you: an invoice that arrives as data beats one that a machine has to read.
Sources, and what we checked
- Department for Business, Innovation, Science and Trade (formerly the Department for Business and Trade): Small Business Survey 2025: businesses with employees (official statistics, 15 October 2026), its report, the Cohort C data tables (Table 9) and the questionnaire from the methodology page; and the 2024 report for its fieldwork dates and 62%.
- HMRC: Electronic invoicing: SME usage and attitudes (published 26 March 2026; the quantitative report is dated May 2025, with fieldwork from 24 February to 18 March 2025, and its questionnaire is in Appendix B).
- The government’s e-invoicing consultation (13 February 2025) and consultation response (26 November 2025); Budget 2025 (26 November 2025); the Tax update 2026 summary (23 June 2026); HMRC’s Transformation Roadmap update 2026 (2 July 2026); and the Chancellor’s letter on the Budget date (31 July 2026).
- Every page above was read on 15 October 2026 and again on 17 October 2026, the morning we published, the government pages through GOV.UK’s content API and the spreadsheet and questionnaire from the files themselves. On 17 October the text of every page was unchanged, and the spreadsheet and questionnaire were the same files.
- Our own arithmetic: "roughly 46%" (62% of the 74% of small employers that use software). The two percentages come from differently weighted bases, so treat it as approximate.
- Every quotation above was tested automatically against the text of its source before publication.