Roopal Pujara, Projects team, Customs and Indirect Tax at HMRC reports,
The penalties for late applications start at £500 and escalate to a maximum of £3000. Businesses risk a £10,000 penalty and a criminal conviction if they trade without approval on or after 1 April 2019.
Information on how to register can be found here
Check out HMRC’s guidance on whether you need to apply