Businesses registered for the Trader Support Service (TSS) should pre-enrol for the new platform before 20 October, HM Revenue and Customs said in a 22 September 2026 announcement. From that date, all goods movements between Great Britain and Northern Ireland must be submitted on the new platform, and the current system will not accept new movements.

HMRC said businesses would receive emails from 1 October with pre-enrolment instructions and access to a test environment. Gill Evans, HMRC's Director of Customs Services and Operations, said the department was working to make the move straightforward and urged businesses to look out for their invitation email and pre-enrol before 20 October. HMRC said it had contacted more than 66,000 registered businesses with guidance, webinars and other support resources.

Businesses will need to create a new password and update their details and permissions; HMRC estimated this could take between 5 and 30 minutes, depending on business size and availability of information. The new platform, operated by Netcompany, has run in private beta since July, with hundreds of declarations submitted, HMRC said.