Is e-invoicing mandatory
in the UK?

The short answer is: not yet, and from April 2029 only for VAT invoices. That sounds simple, but "VAT invoices" has a specific meaning in UK VAT law, and it decides who the mandate reaches. This guide works through it situation by situation, using HMRC's own rules on when a VAT invoice is needed, and flags the cases the government has not yet settled.

Start with the VAT invoice rules

The mandate attaches to VAT invoices, so the first question is when a VAT invoice is needed at all. HMRC's VAT guide (Notice 700) says that whenever you supply standard-rated or reduced-rated goods or services to another VAT-registered person, you must give that person a VAT invoice. Your customer needs it as evidence to reclaim the VAT you charged. The same guidance says:

• you do not have to issue VAT invoices for zero-rated supplies
• you do not need to issue VAT invoices to customers who are not VAT registered, although in practice many businesses issue one to anyone who asks
• you must not issue VAT invoices for goods sold under the second-hand margin schemes
• where your customer operates self-billing, the customer issues the invoice instead

You normally have 30 days from the tax point to issue a VAT invoice. The VAT invoice glossary entry covers what one must contain.

Who is in scope

Receiving matters as much as sending. A VAT-registered sole trader who sells mostly to the public still buys from VAT-registered suppliers, and from April 2029 those suppliers' VAT invoices will arrive as e-invoices. Your software will need to receive them.

If you are not VAT registered

The government's response says that, as e-invoicing will be mandated for VAT invoices, many of the smallest businesses, which are not required to register for VAT and choose not to, will not be obliged to adopt it. You must register for VAT if your taxable turnover over the last 12 months goes over £90,000, or you expect it to go over £90,000 in the next 30 days alone. If you are close to that line, the VAT registration checker shows where you stand, and the guide on e-invoicing if you are not VAT registered covers what still affects you, such as receiving e-invoices, and when it might be worth adopting anyway.

Consumer sales

Sales to consumers are outside the mandate, because VAT invoices are not issued for business-to-consumer transactions. A VAT-registered electrician who rewires a family home, a hairdresser, a café: their sales to the public are unaffected. If the same business also invoices other businesses, those invoices are in scope. The guide on why consumer sales are excluded explains the reasoning.

The edge cases still to be settled

Some situations depend on detail the government has not yet published. Until the Budget 2026 roadmap and the standards that follow, treat these as open:

The government has said the regime will look at sector-specific needs, and HMRC has already confirmed that concerns raised about self-billing and the VAT reverse charge have been addressed in other jurisdictions that mandate e-invoicing. The UK mandate guide will record each answer as it arrives.

Sole traders, partnerships and companies alike

The mandate is about VAT invoices, not about how your business is set up. A VAT-registered sole trader, partnership or limited company all issue VAT invoices in the same way, so all are in scope in the same way. Size matters only through VAT registration: there is no separate turnover threshold for e-invoicing in the mandate as announced, even though some consultation respondents suggested one. If you are VAT registered, assume your VAT invoices are in scope.

Special VAT schemes

Two popular schemes for small businesses change how you account for VAT, but not whether you issue VAT invoices:

• The Flat Rate Scheme. You pay HMRC a fixed percentage of your turnover, but you still charge your customers VAT at the normal rate and issue them normal VAT invoices. Those invoices are in scope.
• Cash accounting. You account for VAT when you are paid rather than when you invoice, but you still issue VAT invoices to VAT-registered customers. Those are in scope too.

Retailers who use one of HMRC's retail schemes mostly sell to consumers, but where they issue VAT invoices to business customers, those invoices are VAT invoices like any other.

Registering for VAT after April 2029

If your turnover crosses £90,000 after the mandate starts, you will need to register for VAT, and the mandate as announced covers all VAT invoices. So a business that registers after April 2029 should expect to issue e-invoices from the start of its registration. If you are growing towards the threshold, choosing invoicing software that already supports e-invoicing saves a second switch later.

Suppliers to the public sector today

Some businesses are already dealing with e-invoicing before the mandate. All bodies covered by the Public Procurement Act 2023 must accept e-invoices that comply with the European standard EN 16931, and NHS Supply Chain requires its suppliers to issue e-invoices through the Peppol network. If a public sector customer asks for e-invoices now, that is their requirement, not the 2029 mandate, but it is a good early test of your software. The Peppol explainer covers the network these customers use.

Worked examples

A VAT-registered web developer invoices agencies and small companies, all VAT registered. Every sales invoice is a VAT invoice, so all of them must be e-invoices from April 2029, and the software subscriptions and equipment the developer buys will arrive as e-invoices too.

A VAT-registered builder does work for homeowners and for a housing association. The homeowner jobs are consumer sales, outside the mandate; the housing association work is in. Some of the builder's subcontract work may fall under the domestic reverse charge, one of the areas where the UK detail is still to come.

A sole trader cleaner with turnover of £40,000, not VAT registered, invoices a few offices. They issue ordinary invoices, not VAT invoices, so the mandate as announced does not oblige them to e-invoice. If turnover heads towards £90,000, that changes on registration.

Common misconceptions

• "Only big companies are affected." Any VAT-registered business issuing VAT invoices is covered, from a one-person consultancy upwards.
• "It only affects the invoices I send." Invoices must be received electronically too, so your purchase invoices change as well.
• "My shop is exempt because I am small." Consumer sales are outside the mandate because no VAT invoice is issued, not because of size. Any VAT invoices to business customers are in.
• "Not being VAT registered means I can ignore it." You are not obliged to adopt e-invoicing, but VAT-registered customers may still prefer suppliers who can send e-invoices, and you will need to know when your turnover would bring you in.
• "The rules are final." The scope is announced; the detail, including the edge cases above, is still being designed.

What to do now

Work out which of your invoices are VAT invoices today, and which you receive. That tells you most of what the mandate will mean for you. Then keep invoicing from software, keep customer VAT numbers accurate, and watch for the Budget 2026 roadmap on the e-invoicing hub. The VAT calculator is handy for checking the VAT on each invoice in the meantime. If you are unsure whether a particular invoice is a VAT invoice at all, the guide on whether to charge VAT on your invoice walks through it.