VAT registration threshold

The turnover level at which registering for VAT stops being optional.

What it means

Registration is compulsory once VAT-taxable turnover over the previous rolling twelve months exceeds the threshold, or if you expect to exceed it in the next thirty days alone.

Why it matters

Crossing it changes your prices, your admin and your cash flow overnight. For a business selling to consumers it effectively cuts the margin by the VAT rate.

What it looks like in practice

The test is a ROLLING twelve months, not your financial year. Businesses cross it without noticing because they only look at the annual accounts.\n\nVoluntary registration below the threshold can be worth it where customers are VAT-registered and you have significant input VAT.

What to watch out for

Deliberately suppressing turnover to stay below it, which caps the business and is a well-known pattern HMRC understands. And registering late, where HMRC backdates and expects VAT on sales you never charged it on.

Where to get proper advice

GOV.UK for the current rates and thresholds, which move most years. Your accountant before acting — this is exactly the kind of question a fee is for.