Published 20 May 2026. The UK VAT registration threshold for 2026/27 remains £90,000 — unchanged from the rise on 1 April 2024 that took it from £85,000. That £90,000 sounds like a comfortable buffer until you realise it is measured on a rolling 12 months, not a tax year, and that the moment you cross it you are 30 days from a mandatory registration deadline. A surprising number of growing UK sole traders and small companies trip on this corner each year — not because they ignored VAT, but because they were watching the wrong number.
This is what crossing the threshold actually means in practice, what your options are, and how to think about voluntary deregistration if your revenue subsequently drops back.
The £90,000 threshold — what it actually measures
The VAT registration threshold is measured against your VAT-taxable turnover over a rolling 12 months, not your accounting year and not the tax year. There is a second, separate trigger: a forward-looking test where you reasonably expect to exceed the threshold in the next 30 days alone. HMRC's VAT registration guidance sets out both tests in full.
- Rolling-12 test. At the end of every month, look back over the previous 12 months. If VAT-taxable turnover for that 12-month window exceeds £90,000, you must register.
- 30-day forward test. If at any single point you expect your VAT-taxable turnover in the next 30 days alone to exceed £90,000 (a large contract win is the textbook example), you must register immediately.
- What counts as VAT-taxable turnover. Sales of standard-rated, reduced-rated and zero-rated goods and services in the UK. Exempt supplies (insurance, some education, residential rent) do not count. Outside-the-scope supplies do not count.
- What does not save you. "I had a good month but the year will be fine" does not save you. The rolling-12 test is mechanical; it does not care about your annual forecast.
The most common way owners miss the moment is by watching their accounting-year turnover instead of the rolling-12. A business with a 31 December year-end can pass £90,000 on a rolling basis in August and never see it on the year-end P&L. The threshold has already been crossed; the clock has already started.
The 30-day registration window
Once you cross the threshold under the rolling-12 test, you have until the end of the month following the month you crossed it to register, with VAT effective from the first day of the second month after crossing. Cross the threshold during July 2026 → register by 31 August 2026 → effective VAT date 1 September 2026. Under the 30-day forward test, you must register before the 30-day period ends, and VAT is effective from the date you first expected to exceed the threshold.
Late registration penalties are tiered by how late you are:
| How late you register | Penalty |
|---|---|
| Not more than 9 months late | 5% of the VAT due from the effective registration date |
| 9 to 18 months late | 10% of the VAT due from the effective registration date |
| More than 18 months late | 15% of the VAT due from the effective registration date |
| Plus, in every case | You owe VAT on every sale from the effective date, whether you charged your customers or not |
The penalty for late registration is recoverable if your customers will accept retrospective VAT invoices. The VAT itself is not — if you have been invoicing without VAT to consumers (B2C), you cannot generally go back and add 20% to invoices already paid. You absorb the VAT out of revenue you have already booked and spent. This is the single most expensive consequence of missing the threshold by accident. HMRC's VAT Notice 700/1 is the definitive reference.
What changes the day you register
Once your VAT effective date arrives, three things change at once and most of the post-registration grief comes from not having prepared for any of them.
- You charge VAT. Standard rate is 20% on most goods and services, 5% on some (domestic fuel, children's car seats), 0% on books, most food, and so on. Your invoices must include your VAT number, the VAT rate applied, and the VAT amount as a separate line.
- You reclaim input VAT. VAT on your business purchases — software, equipment, professional fees, business travel — becomes reclaimable, subject to the usual rules. You can also reclaim VAT on goods bought up to four years before registration that you still hold, and on services bought up to six months before registration, provided they were for business use. This is real money — a software-heavy or equipment-heavy business often gets £2,000–£8,000 back on the first return.
- You file MTD VAT quarterly. Since April 2022, all VAT-registered businesses must keep digital records and file via Making Tax Digital. You need HMRC-compatible software. Quarterly returns are due one month and seven days after each VAT period end, with payment by direct debit normally taken three days after that.
If you are also a sole trader heading into MTD ITSA on the £50K income threshold from 6 April 2026, the operating overlap matters: VAT quarters and ITSA quarters are not aligned by default, so you can end up with eight submission events a year. Aligning them takes a deliberate decision when you register. Our MTD for Income Tax service handles both regimes in one rhythm.
Voluntary registration and voluntary deregistration
Two scenarios sit either side of the £90,000 line.
Voluntary registration below £90,000. You can register voluntarily at any turnover. It is worth doing when your customers are themselves VAT-registered (so they reclaim the VAT you charge), and when you have material input VAT to reclaim — equipment-heavy launches, software-heavy SaaS startups, agencies with significant subcontractor spend. It is rarely worth doing when your customers are consumers, because the 20% increase in your effective price comes straight out of your margin or your demand.
Voluntary deregistration if revenue drops. If your VAT-taxable turnover falls and you reasonably expect it to stay below the deregistration threshold of £88,000 (set £2,000 below the registration threshold) for the next 12 months, you can apply to deregister. HMRC's deregistration guidance sets out the process. Deregistration has a sting: you must account for VAT on any business assets you still hold (stock, equipment, vehicles) that you originally reclaimed VAT on — the "deemed supply" rule. For a service-heavy business this is often a non-issue; for a stock-holding retailer it can be material.
Voluntary deregistration is also worth considering for a sole trader who is genuinely scaling back — perhaps moving to part-time, semi-retiring, or pivoting to a different business model — where the administrative cost of MTD VAT quarterly filings outweighs the value of the input VAT reclaim.
The Flat Rate Scheme — when it helps, when it does not
The VAT Flat Rate Scheme is available to businesses with VAT-taxable turnover under £150,000. Instead of accounting for input and output VAT separately, you pay a flat percentage of your gross (VAT-inclusive) turnover to HMRC and keep the difference. The flat rate varies by business sector — typically 11%–14.5% for service businesses.
The catch is the "limited cost trader" rule, introduced in 2017. If your business spends less than 2% of gross turnover (or under £1,000 a year) on relevant goods, you are forced onto the 16.5% rate, which leaves almost no margin. Most consultants, freelancers and digital agencies are limited cost traders. The Flat Rate Scheme is therefore now mostly attractive to businesses with significant physical goods spend, or to certain professions where the sector rate is genuinely favourable. Modelling both options before electing is essential. Our limited company accountant work routinely re-tests the Flat Rate Scheme against the standard method at year-end.
The four most expensive mistakes
- Watching annual turnover instead of rolling-12. The rolling-12 figure can cross £90,000 mid-year even though the annual P&L stays below it. Monitoring the wrong number is how owners get caught accidentally and incur unrecoverable retrospective VAT.
- Splitting one business into two to stay under the threshold. Artificial business separation — same customers, same operations, two paper companies — is a textbook target for HMRC's disaggregation rules, and the assessments can be retrospective. Genuine separate businesses are fine; cosmetic ones are not.
- Not invoicing VAT during the gap between registration and receiving your number. You owe VAT from the effective date even if your VAT number has not yet arrived. The correct approach is to invoice gross (without showing VAT separately) and reissue VAT invoices once the number is confirmed — not to wait silently and absorb the VAT yourself.
- Forgetting MTD compliance. Registering for VAT and then filing the first return from a spreadsheet without bridging software is non-compliant. HMRC-compatible software has been mandatory for all VAT registrations since April 2022.
FAQs
The £90,000 threshold is a hard line, not a soft target. The owners who cross it cleanly are watching the rolling-12 monthly, have their software ready, and treat the 30-day window as the actual deadline. The owners who cross it badly are looking at the wrong number and find out about VAT registration from HMRC, not from their own books.
Sense-check whether you should be VAT registered
If your turnover is approaching £90,000, has just crossed it, or fell below it after a strong year, the right answer is not obvious — it depends on your customer mix, your input VAT, and the operating cost of MTD. Let me look at the numbers with you and reply with a written view.
Start with a free written assessment — bring your rolling-12 turnover and your customer mix, and Stuart will reply with a clear recommendation.