Free tool
When do I need to register for VAT?
If your business isn't VAT registered, enter your sales for each of the last 12 months. We'll add them up the way HMRC does and show when you'd go over the threshold.
Sales each month
Taxable turnover for each complete month: everything you sold that isn't exempt from VAT, before expenses.
£0 of £90,000 in the 12 months to October 2026
0% of the threshold
Enter your sales for each month to see when you'd reach the threshold.
How the threshold works
The VAT registration threshold is £90,000 (from 1 April 2024). It's a rolling test: at the end of every month, add up your taxable turnover for the last 12 months. It's not your tax year or your accounting year.
If that total goes over £90,000, you must register within 30 days of the end of the month in which it went over. Your registration takes effect from the first day of the second month after. For example, if you go over at the end of March, register by 30 April, and you're registered from 1 May.
There's a second test looking forward: if you expect your taxable turnover in the next 30 days alone to go over £90,000, you must register by the end of those 30 days.
Taxable turnover is the total of everything you sell that isn't exempt from VAT, including zero-rated sales. It's your sales, not your profit.
Your figures stay in this page and aren't saved. Sign in to Octotax to keep them and get a warning as you get close. General information, not tax advice. See Register for VAT on GOV.UK.