The post-Brexit customs problem
When the UK left the EU, Northern Ireland's land border with the Republic of Ireland (an EU member state) became the only physical UK-EU border. The original Northern Ireland Protocol (Brexit Withdrawal Agreement) tried to solve this by treating Northern Ireland as if it were still inside the EU customs union for goods. That created friction for goods moving GB → NI — even though both sides are part of the UK internal market.
The Windsor Framework (in force from 2024) is the renegotiated version. It introduces two routing lanes for GB → NI goods: the green lane (light-touch customs) and the red lane (full EU customs).
Green lane vs red lane
Green lane — for trusted UK businesses moving goods to stay in NI
- Available to UKIMS-registered traders (UK Internal Market Scheme)
- Requires the goods to be 'at risk of staying in NI' — i.e. not for onward movement to the EU
- Reduced customs declaration (simplified frontier declaration)
- No tariff if goods qualify under UKIMS
- Faster border processing
Red lane — full EU customs
- Required for goods 'at risk of moving on to the EU'
- Full customs declaration (CDS)
- EU-rate tariff applies if goods are not preferential under UK-EU TCA rules of origin
- Slower border processing, more documentation
UKIMS — the trusted-trader scheme
UKIMS is the registration system that grants green-lane eligibility. To register, the business needs:
- A UK-established business (with UK premises and UK staff)
- An EORI number (UK XI version for NI movements)
- A clean compliance record (no recent customs / VAT breaches)
- The goods must be for end-use in NI (not for onward sale to the EU)
Registration is free but requires HMRC review. Approval typically takes 4-6 weeks.
What importers and forwarders typically get wrong
From FreightSnap conversations with importers and freight forwarders adapting to the Windsor Framework:
- Assuming green-lane eligibility without UKIMS — A trader who hasn't registered for UKIMS cannot use the green lane, even if their goods would qualify on substance. The registration is non-negotiable.
- Misclassifying goods as 'at risk of staying in NI' — Goods that ultimately get sold to a customer in the Republic of Ireland aren't green-lane eligible, even if they sit in an NI warehouse first. HMRC tracks the end use.
- Forgetting Postponed VAT Accounting — Even on green-lane goods, the VAT treatment matters. PVA is the default for most UK-registered importers but has to be claimed correctly on the VAT return.
What FreightSnap surfaces
FreightSnap walks the importer / forwarder through:
- UKIMS registration status
- Green-lane vs red-lane eligibility (per consignment)
- Landed cost including PVA, duty deferment, customs broker fees
- Origin documentation requirements (UK-EU TCA preferential origin)
- Pair-with: ShopSnap for SKU-level margin impact, HaulageSnap for the transport leg economics
And produces a route + cost summary so the importer can plan the next consignment with full visibility.
The boundary
FreightSnap is decision support. The actual customs declaration (CDS submission), UKIMS application and HMRC interaction stays with the regulated customs broker. FreightSnap surfaces the routing picture; it does not file to CDS or claim under UKIMS.
Try it
Run FreightSnap for a Windsor Framework walk-through, or pair with HaulageSnap for the transport-leg margin and operator-licence picture.