Published: July 2026 | Fact-Checked & Audited By: David Vance, CTA FCA (Chartered Tax Advisor & Accountant)
This guide is fully updated for the 2026/27 HMRC tax year. All calculations and tax rules have been audited against official UK legislation.
For growing UK small businesses, monitoring sales turnover is one of the most critical regulatory compliance duties. Under HMRC rules, once your taxable turnover crosses the statutory limit, registration becomes mandatory. In this comprehensive guide, we review the UK VAT registration threshold rules for the 2026/27 tax year, explain how to calculate your rolling 12-month taxable turnover, discuss the pros and cons of voluntary registration, and outline the penalties for late registration.
The UK VAT Registration Threshold for 2026/27
The UK VAT registration threshold is currently set at £90,000. This threshold was raised in April 2024 (from £85,000) and remains at £90,000 for the 2026/27 tax year. The deregistration threshold—the level below which you can apply to cancel your registration—is set at £88,000.
If your taxable turnover exceeds £90,000, you have a legal obligation to register with HMRC. Taxable turnover is the total value of all sales and services your business makes that are not exempt from VAT. This includes standard-rated (20%), reduced-rated (5%), and zero-rated (0%) sales. It excludes exempt sales (such as postage stamps, financial services, or property rentals).
How to Calculate Your Rolling 12-Month Taxable Turnover
The most common mistake business owners make is assuming the £90,000 threshold applies to their fixed annual accounting year or a standard tax year (April to April). HMRC measures turnover on a rolling 12-month basis.
At the end of every calendar month, you must calculate your total taxable sales for the preceding 12 months. If your taxable turnover for that 12-month period exceeds £90,000, you must register. This means you must perform this check 12 times a year, not just once.
Example of the Rolling 12-Month Check
Consider a retail business with fluctuating monthly sales:
- Between May 2025 and April 2026, total sales are £88,000. No registration is required.
- In May 2026, the company has a strong month, earning £5,000.
- To run the check at the end of May 2026, the owner adds May 2026 sales (£5,000) and subtracts the sales from May 2025 (which were £2,000).
- The new rolling 12-month total is £88,000 + £5,000 – £2,000 = £91,000.
Because the rolling total has crossed the £90,000 threshold, the business must register. You must notify HMRC within 30 days of the end of the month in which you crossed the limit. In this example, you must register by 30 June 2026. Your registration will take effect on 1 July 2026. If you want to track your rolling sales compliance, use our VAT Threshold Calculator.
Should You Register Voluntarily?
If your business turnover is below £90,000, you can still choose to register voluntarily. This can bring several strategic advantages:
- Reclaiming VAT on Purchases: If you buy expensive stock, raw materials, or software for your business, you can reclaim the VAT you pay, lowering your operational costs.
- Corporate Prestige: Being registered for VAT makes your business look larger and more established, which is useful when pitching to large corporate clients.
- B2B Trading: If your customers are VAT-registered businesses, they can reclaim the VAT you charge them, meaning registering doesn’t make you more expensive.
However, if you sell to the general public (B2C), registering voluntarily will force you to raise your prices by 20% to cover the VAT, which can make you uncompetitive. You can run cost comparisons for your business structure using our Sole Trader vs Ltd Company Calculator.
Penalties for Late Registration
If you fail to register within the 30-day window, HMRC will charge a penalty based on the amount of VAT due from the date you should have registered. You will still have to pay the VAT on all sales made since that date—even if you did not charge VAT to your customers. This can severely damage a small business’s cash flow, making regular monitoring essential.
Frequently Asked Questions: VAT Threshold
Q: What is the UK VAT threshold for the 2026/27 tax year?
A: The mandatory UK VAT registration threshold is £90,000. If your rolling 12-month taxable turnover exceeds this limit, you must register with HMRC.
Q: What is the rolling 12-month period for VAT registration?
A: It is any continuous 12-month period, checked at the end of each month. It is not tied to your financial year or the tax year. For example, you must assess your sales from June 1st of last year to May 31st of the current year.
Q: Can I apply for an exemption if I only cross the threshold temporarily?
A: Yes, if you can prove to HMRC that your turnover crossed the £90,000 limit due to a temporary one-off event and will fall back below £88,000, you can apply for a registration exception.