UK VAT registration threshold

In the UK you must register for VAT once your taxable turnover passes the threshold. The current threshold is £90,000 over a rolling 12 month period. This guide explains when the clock starts, what counts as taxable turnover, and what to do when you are near the line.

The rule in plain words

You must register if either of these is true:

• your total taxable turnover in the last 12 months went over £90,000, or
• you expect it to go over £90,000 in the next 30 days alone.

Registration is not optional at that point. You have a limited window to register after the threshold is crossed, and VAT applies from the registration date. HMRC's own guidance (gov.uk/vat-registration) is the authoritative source and this guide only summarises it.

What counts as taxable turnover

Taxable turnover is the total value of everything you sell that would be taxable at any rate, including zero rated sales. Exempt supplies (most education, health and financial services) do not count toward the threshold, even though they are part of your business.

One-off sales of capital assets count too. A business that mostly sells exempt services can still cross the threshold with a single large sale of equipment.

At the edge: planning, honestly

It is legal to manage the timing of sales so you stay under the threshold, as long as you are not artificially splitting a single supply to avoid registration. What is not allowed is restructuring purely to dodge the obligation. HMRC watches for contrived arrangements, and the penalties are not worth it.

If you are close, keep a rolling 12 month total in a spreadsheet or in your accounting software. The moment it crosses £90,000, the registration clock starts.

Should you register voluntarily?

Many small businesses register below the threshold on purpose. If your customers are VAT registered, they can reclaim the VAT you charge, so it costs them nothing and you can reclaim input VAT on your own purchases. If your customers are consumers, charging 20% more makes you less competitive, and voluntary registration usually does not pay.

What changes when you register

• you charge VAT on taxable sales and issue VAT invoices,
• you reclaim input VAT on purchases,
• you file VAT returns, usually quarterly, and
• you keep digital records if you use Making Tax Digital for VAT.

The VAT calculator handles the arithmetic side: what 20% on your prices means, and what the gross figures look like for your customers. The question of whether and when to register is a rules question, and HMRC's guidance is the place to settle it.