This calculator helps you track how close your business is to the UK VAT registration threshold.
If your taxable turnover exceeds the threshold within any rolling 12-month period, you must register for VAT.
Understanding how much of the threshold you have used — and how much remains — is critical for avoiding unexpected VAT obligations.
This tool shows your percentage used and remaining turnover so you can plan ahead and stay compliant.
The calculator shows how much of the VAT threshold you have used and how much remains.
If your percentage exceeds 100%, you are already over the threshold and may need to register immediately.
This allows you to monitor your growth and avoid compliance risks.
The UK VAT threshold is based on a rolling 12-month period, not a fixed tax year.
This means you must continuously monitor your turnover over the previous 12 months.
If your turnover exceeds the threshold at any point, VAT registration becomes mandatory.
Planning ahead prevents sudden financial and administrative disruption.
Example 1:
£40,000 turnover → 44.44% used → £50,000 remaining
Example 2:
£92,000 turnover → 102.22% used → £2,000 over threshold
Example 3 (Rapid growth):
Businesses scaling quickly must monitor monthly to avoid unexpected registration.
Currently £90,000 in a rolling 12-month period.
As soon as you exceed the threshold.
No, it is rolling 12 months.