Mandatory e-invoicing starts in 2029: what you need to do first

The government recently announced that e-invoicing will become mandatory for business-to-business transactions from April 2029. But despite the looming deadline, many small business owners are completely in the dark about what this actually means. If you’re feeling confused by the upcoming changes, you’re not alone.

A recent study by HMRC found that 59% of small and medium-sized businesses claim to be familiar with e-invoicing – but not many are using it. In fact, many business owners confuse it with sending a standard PDF in an email.

We explain exactly what e-invoicing is, what the new rules mean, and how you can prepare your business for 2029.

what is an e-invoice?
what’s changing for your business?
3 steps you can take to prepare your business

The reality of e-invoicing for small businesses

Even though 2029 sounds far away, the shift towards digital tax and invoicing is already happening. Yet adoption remains incredibly low among small businesses. Only 15% of SMEs currently send e-invoices, and just 24% receive them.

Instead, most owners stick to what they know. A massive 95% of small businesses still use PDFs or emails to send their invoices. And paper invoicing remains surprisingly common, with 78% of businesses still receiving physical invoices.

The government will publish a clear roadmap before the rollout, but it pays to understand the basics right now.

15%

of small business owners use e-invoicing

95%

still use PDFs and emails instead of e-invoices

What is an e-invoice?

An e-invoice is the digital exchange of invoice information directly between a supplier and a customer – usually between their respective accounting systems. They use a machine-readable format that allows the data to be processed automatically, meaning there’s no need for manual data entry.

It’s important to understand what doesn’t count as an e-invoice. Sending a PDF, a Word document, or an image file in an email is not e-invoicing. Using software to scan and extract text from a paper invoice doesn’t count either.

The goal of true e-invoicing is to improve accuracy, help you keep up-to-date records, and make your tax compliance much more efficient.

What’s changing for your business?

From April 2029, the government will require you to issue e-invoices for all business-to-business and business-to-government transactions where VAT is due. If you only sell directly to consumers, these transactions will fall outside the scope of the new rules.

This change is a major part of a broader plan to modernise the UK tax system, alongside other digital initiatives to reduce paperwork and help prevent tax fraud.

Because it requires a shift to fully integrated digital systems, this isn’t just a minor compliance update. You’ll need software that can send and receive these structured files.

Important: this mandatory update is only for business-to-business transactions. Meaning it won’t apply to your business if you’re a window cleaner invoicing a customer for cleaning the windows on their home.

But if you’re a freelancer doing work for another business, then you’ll need to start using the required software.

3 steps you can take to prepare your business

While you have a few years before the rules take effect, early preparation can save you a lot of stress down the line. Here are 3 steps to help you prepare:

Review how you currently send and receive invoices – if you rely heavily on paper or PDFs, it’s time to look at digital alternatives.
Talk to your accountant or check your current accounting software – major providers are already heavily involved in a government consultation and will likely offer built-in e-invoicing features soon.
Keep an eye out for the government’s implementation roadmap – staying informed can help you make the right software choices, avoid future penalties, and keep your business running smoothly.

More changes small business owners should know

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