Sole traders and VAT

by Michael Blaken

Whether you’re a freelance designer, a local plumber, or an online seller, the VAT question is one of the biggest milestones in a sole trader’s journey. It often feels like a cliff edge – cross it, and suddenly you’re charging 20% more and dealing with quarterly returns to HMRC.

But does every sole trader need to be VAT registered? Here is the breakdown of the rules, thresholds, and strategic choices.

The compulsory threshold: when you have no choice

VAT registration is mandatory if your taxable turnover goes over a specific limit; the VAT registration threshold is £90,000.

There are two tests you must keep an eye on every single month. If you meet either, you must register to pay VAT:

• The backward look (rolling 12 months): At the end of every month, look back at your total sales for the previous 12 months. If that total exceeds £90,000, you have 30 days to notify HMRC.
• The forward look (30-day rule): If you expect your turnover to go over £90,000 in the next 30 days alone (e.g., you just landed a massive, one-off contract), you must register immediately.

Remember, the rolling 12 months is not the same as the tax year (April to April) or the calendar year. It is any consecutive 12-month period.

Mandatory versus voluntary registration

You don’t have to wait until you hit £90,000 to register. Many sole traders register voluntarily – there are pros and cons to both scenarios.

The Benefits:

• Reclaiming VAT: If you have high overheads (buying stock, expensive equipment, or software), you can reclaim the VAT you pay on those items.
• Credibility: Some larger corporate clients prefer working with VAT-registered businesses as it suggests a certain scale.
• Backdating: You can often reclaim VAT on goods you bought up to four years ago, provided you still have them and have the receipts.

The Disadvantages:

• Price Rises: If you sell to the general public (B2C), you might have to increase your prices by 20% to cover the VAT, which in turn could drive customers to unregistered competitors. By contrast, for those selling B2B, the clients can claim back the VAT.
• Admin Burden: You must keep digital records and submit VAT returns every quarter under Making Tax Digital (MTD) rules.

What happens if you get it wrong?

If you exceed the threshold and fail to tell HMRC within 30 days, you face a Failure to Notify penalty.

On top of that, you will have to pay backdated tax. HMRC will calculate what you should have charged in VAT from the date you were supposed to be registered. You will have to pay that money to HMRC out of your own pocket, even if you never actually charged your customers that extra 20%.

Can you deregister?

If your business slows down and your turnover drops, you can apply to deregister. The VAT deregistration threshold is currently £88,000 for the previous 12 months (or typically four quarterly VAT Returns). HMRC keeps this slightly lower than the registration limit to prevent businesses from flipping in and out of the system every time they have a quiet month.

Summary checklist for sole traders

• Check your rolling turnover at the end of every month.
• Identify your customers: If they are VAT-registered businesses, registering early usually won’t hurt your sales (as they can reclaim the VAT).
• Go digital: Ensure you are using MTD-compatible software so you’re ready for the paperwork.

Finally, it is worth noting, that all these same rules apply if you operate a limited company.

At Optimum, we work with many sole traders supporting them through business growth and – if they need or want to – becoming VAT registered. For help and advice, get in touch with our tax team.