VATREG02250 - Basic principles of registration: meaning of taxable supply
The VAT Act 1994 section 4(2) provides that a taxable supply is a supply of goods or services made in the United Kingdom other than an exempt supply.
It follows that the persons (see VATREG02150) who make a supply (other than an exempt supply) of goods or services in the UK, make a taxable supply whether or not they are a ‘taxable person’.
Unregistered persons can make taxable supplies, but they must not charge VAT until they are registered.