E-invoicing for small businesses in the UK: a plain guide

If your small business is VAT-registered, you should expect to send and receive VAT invoices as e-invoices from April 2029. For most small firms that will mean using accounting software that sends invoices over the Peppol network for you, rather than emailing PDFs.

This guide explains what changes, what does not, and what you can do now without spending money.

Does it apply to my business?

The government's consultation response, published with the Autumn Budget 2025, says e-invoicing will be mandatory for VAT invoices from 2029. It has not set a turnover or employee threshold.

• VAT-registered and you invoice other businesses or the public sector: you are in scope, as things stand.
• VAT-registered and you sell mostly to consumers: you may not issue many in-scope invoices, but you will still receive invoices from VAT-registered suppliers. The treatment of B2C sales and receipts is not yet confirmed.
• Not VAT-registered: the consultation response notes that many of the smallest businesses are not registered for VAT and will not have to adopt e-invoicing. Your customers may still ask for e-invoices.
• Sole traders: the same rules depend on VAT registration, not legal form. See e-invoicing for sole traders.

Not sure? Use our two-minute scope checker.

What actually changes day to day

Today you might create an invoice in your software, save it as a PDF and email it. After the change:

1. You create the invoice in your software as now.
2. Your software turns it into a structured e-invoice and sends it through a Peppol Access Point.
3. Your customer's provider receives it and drops it into their software.

On the buying side, supplier bills arrive in your software as data, ready to approve, instead of as PDFs to type in. This is the four-corner model. There is no government portal to log into, because the UK has chosen a decentralised model.

What does not change: your VAT returns still go through Making Tax Digital, and the government has said there will be no real-time reporting of invoices to HMRC alongside the mandate. Your invoices still need to meet normal VAT invoice rules (see what a VAT invoice must include).

What is confirmed and what is still open

Confirmed: the April 2029 start for VAT invoices; a decentralised model; Peppol as the network. The GOV.UK Tax update 2026 summary says: "The government has announced that the electronic procurement system Peppol will be the core interoperability network for e-invoicing in the UK."

Not yet confirmed: any exemptions, phasing by size, penalties, the exact data standard, and how receipts and simplified invoices are treated. These are expected in the roadmap at Budget 2026 on 28 October 2026.

What will it cost a small business?

Nobody can give a reliable figure yet, and you should be wary of anyone who does. Costs depend on your software and how many invoices you handle. The likely items are:

• a software subscription that includes e-invoicing, or an add-on or per-invoice fee;
• time to clean up customer and supplier details;
• a few hours learning the new screens.

The consultation response says that "simple, low-cost solutions available for small and micro businesses will need to be a priority", and notes that several Making Tax Digital providers aimed at small businesses can already provide e-invoicing. It did not announce grants. Our e-invoicing cost guide lists what to ask for in a quote.

What about the benefits?

Getting paid faster is the most talked-about benefit for small firms. The government's consultation response cites industry research suggesting adoption can reduce late payments by 20% and deliver a 2.2 times return for small firms over two years. Treat these as reported figures from industry research rather than guarantees. The practical gains are easier to see: no retyping of supplier bills, fewer "we never received it" disputes, and invoices that fail validation get flagged before they reach the customer. See the benefits of e-invoicing.

Questions to ask your software provider

Send these by email so you have the answer in writing:

1. Will your product send and receive Peppol e-invoices for UK VAT invoices?
2. Is the Peppol connection included in my current plan, or is there an extra charge?
3. Which Peppol Access Point do you use, and is it certified?
4. What will my Peppol ID be, and will you register me in the Peppol Directory?
5. When will this be available, and can I start before April 2029?
6. What happens if a customer is not yet on Peppol?

If you use simple invoicing apps, spreadsheets or Word templates, plan to move to software that can do this. Our guide on checking Peppol support in your software explains how to verify an answer.

Five things to do now (all free)

• Confirm you are VAT-registered and in scope with the scope checker.
• Check your own business name, address and VAT number are correct in your software.
• Check your main customers' VAT numbers with HMRC's Check a UK VAT number service.
• Ask your software provider the six questions above.
• If you have an accountant or bookkeeper, ask them how they plan to support clients.

Common worries

"I only send ten invoices a month." Volume does not change scope as things stand, but low volume makes the change simple.

"My customer is a big company that already uses Peppol." Good news: you may be able to start early. Some large buyers already receive invoices over Peppol, and NHS Supply Chain requires it of its suppliers.

"I invoice the NHS or a council." Public-sector buyers are already moving. NHS Supply Chain requires suppliers to invoice via Peppol, according to the consultation response. See our NHS guide.

What to do now

You do not need to buy anything before the roadmap is published. Do the five free tasks above, then work through the readiness checklist once the roadmap lands. Keep an eye on the timeline. This is general information, not tax advice; follow HMRC guidance for your own situation.