When to Register for UK VAT: A Guide to the £90,000 Threshold
Understanding when and how to register for UK VAT is vital for avoiding costly HMRC penalties. This guide explains the key thresholds, critical trigger tests, and direct registration requirements to ensure your business remains fully compliant with current UK tax legislation.
Under United Kingdom tax rules, you must register for VAT if your business's VAT taxable turnover exceeds the statutory registration threshold of #90,000 in a rolling 12-month period, or if you expect to exceed it in the next 30 days alone. Businesses must verify their rolling turnover at the end of every calendar month rather than trailing the traditional April tax year calendar.
Key Takeaways: Crucial VAT registration rules at a glance
| Rule Category | Key Threshold or Limit | Notification Deadline | Effective Date of Registration |
|---|---|---|---|
| Historic Rolling Test | #90,000 in past 12 months | Within 30 days of the month end | First day of the second month |
| Future 30-Day Test | #90,000 in next 30 days alone | Before the end of that 30-day period | Date of forming the belief |
When exactly do I have to register for VAT?
You must register for VAT immediately once your UK taxable sales exceed the #90,000 threshold in a cumulative 12-month window or if you anticipate crossing it in a 30-day period.
The calculation requires keeping a continuous tally. At the end of every month, you must sum up your sales for the immediate 12 months prior to see if you have breached the registration boundary.
What is the UK VAT registration threshold?
The UK VAT registration threshold is the statutory limit of taxable turnover, currently set at #90,000, above which a business must register for tax purposes.
This limit was established under the VAT (Increase of Registration Limits) Order 2024 and remains unchanged for the 2026/27 tax year. It applies to all sole traders, partnerships, and limited companies trading within the UK.
How do the historic and future tests work?
The statutory rules under the Value Added Tax Act 1994 (VATA 1994), Schedule 1, paragraph 1, establish two distinct tests to determine your liability to register.
- Historic Test: At the end of each month, assess your cumulative taxable turnover for the preceding 12 months. If this sum exceeds the #90,000 threshold, you must notify HMRC within 30 days, with registration taking effect on the first day of the second month after the threshold was breached.
- Future Test: Identify any point where you have reasonable grounds to believe your turnover will exceed #90,000 in the next 30 days alone. You must notify HMRC by the end of that 30-day period, and registration will take effect from the date you first formed that belief.
What counts towards your VAT taxable turnover?
Calculating your taxable turnover accurately requires careful categorization of your different business income streams.
- Standard-rated sales (20%): Must be included.
- Reduced-rated sales (5%): Must be included.
- Zero-rated sales (0%): Must be included.
- Exempt supplies (e.g., insurance, finance, education): Must be excluded.
- Capital assets: Income from selling business capital equipment must be excluded.
What are the penalties for late VAT registration?
Failing to register for VAT on time results in a backdated tax liability, meaning you are liable for the net VAT on sales from when you should have registered.
Additionally, HMRC applies a penalty calculated as a percentage of the net VAT outstanding based on the severity of the delay.
| Delay Period | Late Registration Penalty Rate |
|---|---|
| Up to 9 months late | 5% of net VAT owed |
| Between 9 and 18 months late | 10% of net VAT owed |
| Over 18 months late | 15% of net VAT owed |
Can I get an exception from VAT registration?
Yes, you can apply for a registration exception from HMRC if your turnover spike is strictly temporary and you meet specific legislative criteria.
If you exceed the #90,000 limit but can demonstrate that your taxable turnover will not exceed the deregistration threshold of #88,000 over the next 12 months, you can write to HMRC to apply for an exception. You must submit written evidence of your projected drop in revenue to be considered.
- Do zero-rated sales count towards the #90,000 VAT threshold?
- Yes. Zero-rated business sales are taxable supplies with a 0% tax rate, so they must be included in your cumulative calculation for the #90,000 threshold.
- What happens if I fail to register for VAT on time?
- HMRC will backdate your registration to the date you were legally required to register. You will owe VAT on all sales made since that date and may face late penalties up to 15% plus interest.
- How long do I have to notify HMRC after crossing the VAT threshold?
- Under the historic test, you must notify HMRC within 30 days of the end of the month in which you exceeded the threshold. Under the future test, you must notify them before the 30-day period ends.
- Does my VAT threshold reset at the end of the tax year?
- No. The threshold calculation is built entirely on a rolling 12-month period. It does not reset with the financial year or calendar year.
Researched by azta from the legislation in force on July 3, 2026. General information, not advice for your case.