Find out when you will still be able to use CHIEF for declaring goods into or out of Northern Ireland.
In due course, all declarations in to and out of Northern Ireland will need to be made using the Customs Declaration Service. Using the Customs Handling of Import and Export Freight (CHIEF) system for Northern Ireland declarations will be reviewed by HMRC and you will be told when to stop using it.
CHIEF can still be used for declaring goods entering Northern Ireland from outside the UK and EU.
Source gov.uk
