VAT threshold calculator
VAT is a turnover test, not a profit test, and it is counted over any rolling 12 months. Put in your taxable turnover and see how close you are to the line.
VAT threshold calculator
Runs entirely in your browser. Nothing you type leaves your device — no accounts, no cookies, no tracking.
The rolling test
You must register if your taxable turnover for the last 12 months goes over £90,000. Count any 12 months in a row, not the tax year, and check it every month.
The 30-day test
If you expect to go over £90,000 in the next 30 days alone, for example from a big contract, you must register by the end of that 30 days. Your registration date is the day you realised.
The deadlines
If you go over on the rolling test you must register within 30 days of the end of that month, and your registration takes effect from the first day of the second month after you went over.
Figures for the 2026/27 tax year, checked 25 October 2026. Sources: VAT registration thresholds; Register for VAT. An estimate, not advice. SideTill is not tax software.
Keep the number for every month
SideTill is the simple record of your side hustle: log the job, send the invoice, record the money when it comes in, and see whether the month actually made you money. It also shows your best month, so you can tell a bad month from a bad habit.
Get SideTill
No account. No sign-up. Your data stays on your phone. The basics are free to use.
Questions
Is it profit or turnover?
Turnover: taxable sales before costs. Some income, like exempt sales, does not count.
Can I register early?
Yes. A business can choose to register below the threshold. That is a decision with pros and cons, so check before you do.
Does SideTill handle VAT?
No. SideTill is for people below the threshold. It does not calculate or file VAT.