The VAT Threshold in 2026: What Happens When Your Turnover Gets Close?

You must register for VAT once your taxable turnover exceeds £90,000 in any rolling 12-month period, or if you expect to exceed it in the next 30 days alone. The VAT registration threshold in the UK for 2026 is £90,000, and for a growing sole trader, the months before you reach it are the moment to plan rather than panic. Blue Tick Accountants, a Guildford-based UK tax advisory and accountancy practice, works with self-employed people approaching this point who want to understand the timing rules, the cash flow impact, and the choice between mandatory and voluntary registration. This article explains what happens as your turnover nears the threshold, how the deadlines work, and the mistakes that most often catch sole traders out.

Key Takeaways

• The VAT registration threshold in the UK for 2026 is £90,000 of taxable turnover measured on a rolling 12-month basis, not a single tax year.
• You must register within 30 days of the end of the month in which your rolling turnover exceeds £90,000, with registration effective from the first day of the second month after you crossed it.
• A separate forward-look test applies: you must register immediately if you expect your taxable turnover to exceed £90,000 in the next 30 days alone.
• The deregistration threshold is £88,000, so you can apply to cancel your registration if your turnover falls below that figure.
• Voluntary registration before reaching the threshold lets a sole trader reclaim VAT on costs and can suit businesses selling mainly to other VAT-registered customers.
• Since 1 April 2022 all VAT-registered businesses must follow Making Tax Digital for VAT, keeping digital records and filing returns through compatible software.

What is the VAT registration threshold in 2026?

The VAT registration threshold in the UK for 2026 is £90,000 of taxable turnover measured over any rolling 12-month period. Taxable turnover means the total value of everything you sell that is not exempt from VAT, including standard-rated, reduced-rated, and zero-rated sales. The threshold is not linked to the tax year running to 5 April; instead, HMRC expects you to check your turnover for the previous 12 months at the end of every month. A sole trader earning £8,000 in most months will cross £90,000 partway through the year, and the obligation to register is tied to that rolling total, not to your annual accounts. The deregistration threshold, the point below which you can ask to leave the VAT system, is £88,000.

When must a sole trader register for VAT?

A sole trader must register for VAT under one of two tests, whichever is met first. The backward-look test requires you to register when your taxable turnover over the previous rolling 12 months exceeds £90,000; you then have 30 days from the end of that month to notify HMRC, and registration takes effect from the first day of the second month after you crossed the line. The forward-look test requires you to register immediately, before the turnover even arrives, if you reasonably expect your taxable turnover to exceed £90,000 in the next 30 days alone, for example after winning a single large contract. Knowing when to register for VAT as a self-employed person means monitoring both tests every month, because missing the deadline leads to a late-registration penalty and backdated VAT you may be unable to recover from customers.

Once registered, the next decision is which scheme to use, and our guide to the VAT Flat Rate Scheme for sole traders sets out when a fixed percentage pays.

What is the cash flow impact of crossing the VAT threshold?

Crossing the VAT threshold changes your cash flow because you must add 20% VAT to most sales and pass it to HMRC, while gaining the right to reclaim VAT on your business costs. For a sole trader selling to consumers who cannot reclaim VAT, this often means either raising prices by up to 20%, which can lose price-sensitive customers, or absorbing the VAT and reducing your margin. For a business selling mainly to other VAT-registered companies, the impact is far smaller, because those customers reclaim the VAT you charge. The offsetting benefit is input VAT recovery: once registered, you can reclaim the VAT on equipment, stock, software, and many overheads. For a full overview of how registration works from start to finish, see our guide to VAT registration.

Worked example: a sole trader approaching £90,000

Consider a self-employed graphic designer whose rolling 12-month turnover reaches £91,500 at the end of September 2026. Because the backward-look test is breached in September, they must notify HMRC by 30 October 2026, and registration takes effect from 1 November 2026. From that date they charge 20% VAT, so a £2,000 project becomes £2,400, of which £400 is VAT owed to HMRC. In their first quarter they also spend £3,000 plus £600 VAT on a new computer and software, and reclaim that £600 as input VAT. If most clients are VAT-registered businesses, the added VAT costs them nothing after they reclaim it, so the designer can maintain prices. If most clients are private individuals, the designer must decide whether to raise headline prices or accept a lower net margin on each job.

Should you register for VAT voluntarily before reaching the threshold?

You can register for VAT voluntarily before your turnover reaches £90,000, and it makes sense when the VAT you can reclaim on costs outweighs the downsides of charging VAT to customers. Voluntary registration suits self-employed people who sell mainly to VAT-registered businesses, who buy significant VATable stock or equipment, or who want their business to appear more established to larger clients. The trade-offs are real: you take on quarterly VAT returns, Making Tax Digital record-keeping, and the discipline that goes with them, and you must charge VAT even to customers who cannot reclaim it. For a sole trader with mostly consumer customers and few VATable costs, voluntary registration usually adds cost and complexity without a clear benefit, so the decision should follow a review of your specific customer base and cost profile.

Frequently Asked Questions

Is the VAT threshold based on the tax year or a rolling 12 months?

The VAT threshold is based on a rolling 12-month period, not the tax year ending 5 April. HMRC expects you to total your taxable turnover for the previous 12 months at the end of each calendar month. If that rolling total exceeds £90,000 at any month end, the registration obligation is triggered, even if your figures for a single tax year would sit below the threshold.

What happens if I register for VAT late?

If you register for VAT late, HMRC backdates your registration to the date you should have registered and treats you as owing VAT from that date, even on sales where you did not charge it. You may face a failure-to-notify penalty based on the tax due and how late the notification was. Registering on time and monitoring your rolling turnover every month avoids this avoidable cost.

Can I avoid VAT registration by splitting my business?

You cannot legitimately avoid VAT registration by artificially splitting one business into separate parts to keep each below £90,000. HMRC has anti-avoidance powers to treat artificially separated businesses as a single entity for VAT, known as disaggregation, and can register them together and demand backdated VAT. Genuine, independently run businesses are treated separately, but deliberate splitting to dodge the threshold is challenged.

Do I have to charge VAT on all my sales once registered?

Once registered, you charge VAT at the correct rate on all your taxable sales, but not every sale carries the standard 20% rate. Some goods and services are zero-rated, such as most food and children's clothing, while others are reduced-rated or exempt. You still include zero-rated sales in your taxable turnover for the threshold test, but exempt sales are excluded. Applying the right rate to each type of sale is essential.

What is the VAT deregistration threshold in 2026?

The VAT deregistration threshold in 2026 is £88,000. If your taxable turnover falls below £88,000 over a rolling 12-month period, or you expect it to in the coming year, you can apply to HMRC to cancel your VAT registration. Deregistration can suit a sole trader whose turnover has fallen and who sells mainly to consumers, but you must account for VAT on certain assets you still hold.

How Blue Tick Can Help

Blue Tick Accountants helps self-employed people decide when to register for VAT, weigh up voluntary registration, and set up Making Tax Digital record-keeping so returns are accurate and on time. The practice reviews your turnover trend and customer base to time registration correctly and protect your margins as you grow. Head to our website and book a meeting now.

Conclusion

The VAT registration threshold of £90,000 is measured on a rolling 12-month basis, so the safest habit for any growing sole trader is to check your previous 12 months of turnover at every month end. Register on time to avoid penalties and backdated VAT, and weigh voluntary registration against your customer base before you commit. The most important action as your turnover approaches the threshold is to plan the pricing and cash flow impact in advance rather than reacting once you have already crossed the line.

About the Author

This guide was written by Leon, founder of Blue Tick Accountants, a Guildford-based UK tax advisory and accountancy practice that helps the self-employed, landlords and limited company owners across the UK manage VAT, tax and compliance with confidence. It was last reviewed for the 2026/27 tax year.

This article is intended for general informational purposes only and does not constitute tax, legal, or financial advice. Tax rules are subject to change and their application will depend on your individual circumstances. You should always seek advice from a qualified professional before taking action. Blue Tick Accountants accepts no liability for decisions made on the basis of this content.

Related reading: VAT Registration: A Step-by-Step Guide for Sole Traders.