Most NCTS transit problems for Northern Ireland trace back to one root cause: the movement was classified by Windsor lane rather than by duty settlement. When the trigger is misread, teams raise the wrong declaration, or none at all, and the movement stalls.
The usual failure points
Rejections cluster around a few issues. An EORI mismatch is common, because Ireland transit declarations generally need a separate Irish EORI rather than a GB or XI number. A lost or unread TAD movement reference is another, since the destination office needs that reference to discharge. Code mismatches between the UK and Irish systems appear when data is re-keyed by hand. These recurring faults are set against the correct process in this NCTS transit guide for Northern Ireland.
Fixing the duty-trigger error
Rebuild the check at the front of the process. Ask where duty settles before deciding on transit, and only then choose T1 or T2.
Preventing repeat rejections
Validate EORI per leg, keep the TAD reference attached to the load, and avoid manual code entry where the two systems must match.
FAQ
- Why was my Irish leg rejected? Often a missing or wrong Irish EORI. Want to cut rejection loops from your filings? Watch a demo.

