Northern Ireland 2026 – Windsor Framework: What It Means for Polish Exporters

Why is Northern Ireland unique after Brexit?

When the United Kingdom left the European Union on 1 January 2021, Northern Ireland found itself in a unique geopolitical position. As part of the UK it formally left the EU, but because of the land border with the Republic of Ireland (an EU member state) it was not possible to introduce a hard customs border on the island of Ireland — doing so would threaten the 1998 Good Friday Agreement.

The solution was first the Northern Ireland Protocol, and then the Windsor Framework negotiated in 2023. In practice this means Northern Ireland:

• remains formally part of the UK customs territory,
• but applies EU rules on goods (including SPS standards),
• has access to the EU single market without customs barriers,
• and simultaneously benefits from trade agreements that the UK has concluded with third countries.

This is the so-called dual market access: goods produced or processed in Northern Ireland can be sold in both the UK and EU markets — without tariffs and without the need to meet additional import requirements on either side.

The Windsor Framework — key principles

The Windsor Framework (officially signed on 27 February 2023 by Rishi Sunak and Ursula von der Leyen) replaced the controversial Northern Ireland Protocol. The main changes are:

1. Two-lane system (Green Lane / Red Lane) — instead of full customs clearance for all goods travelling GB→NI.
2. Zero tariff on industrial goods travelling from GB to NI, provided they are destined exclusively for that market.
3. Simplified SPS checks for retail food (green lane for supermarkets).
4. Stormont Brake mechanism — the Northern Ireland Assembly can veto new EU rules that harm consumers in NI.
5. Lough Erne line — special rules for small and medium-sized enterprises in Northern Ireland trading solely locally.

Green Lane vs Red Lane — which route applies to you?

This is the most important decision you need to make as an exporter sending goods to Northern Ireland from continental Europe (including Poland).

Exporting from Poland to Northern Ireland — step by step

For a Polish exporter sending goods to Belfast, Derry or Newry, the procedure is as follows:

Step 1: Export declaration in Poland (EU side)

Every export from Poland requires an EX/SAD export declaration to be submitted in the Polish AES (Automated Export System). Once the formalities are complete you receive an export MRN and an IE599 document — proof of export, required to apply the 0% VAT rate. The cost of export handling ranges from £45 to £120. Indicative price range — exact quote after documents are submitted.

Step 2: Transit through UK territory (optionally via GB)

If the goods travel through England or Scotland to Northern Ireland (e.g. via Dover–Holyhead–Belfast), a T1 transit procedure through GB territory may be required. The cost of T1 handling ranges from £200 to £500. Indicative price range — exact quote after documents are submitted. Alternatively you can ship directly by sea from Hoek van Holland or from Boulogne to ports in Belfast or Larne — bypassing GB territory.

Step 3: Entry into Northern Ireland

At the port of Belfast (or Larne) the goods are subject to inspection. Depending on the lane chosen:

• Green Lane: simplified document check, no physical inspection (without risk flags), no UK duty.
• Red Lane: full UK import procedure, duty payment according to the UK Global Tariff (UKGT), SPS checks (where applicable).

UKIMS — what is it and who can use it?

UK Internal Market Scheme (UKIMS) is an HMRC registration programme that enables access to the Green Lane. It is open to:

• companies registered in Northern Ireland or the United Kingdom,
• businesses operating in Northern Ireland,
• importers holding a GB EORI.

A Polish company exporting to Northern Ireland does not need to register with UKIMS itself — that is the responsibility of the recipient (importer) in NI. However, your goods must be clearly marked as destined exclusively for the NI market so that the recipient can use the Green Lane.

Dual market access — a benefit for Polish exporters

Northern Ireland offers Polish exporters a unique opportunity not available in any other territory outside the Union:

• Goods produced in NI can be sold on the EU market without duty and without an EU import declaration.
• Goods processed in NI from materials imported from the EU benefit from "made in UK(NI)" status — opening access to the UK market without restrictions.
• For Polish companies with manufacturing or warehousing operations in Northern Ireland, this is an opportunity to serve both the UK and EU markets from a single location.

Goods subject to special rules

Not all goods are treated equally. Special rules apply to:

Food and agricultural products (SPS)

Animal products, plants and food are subject to sanitary and phytosanitary checks. Even in the Green Lane a health certificate (Health Certificate or Phytosanitary Certificate) is required. Checks take place at designated BCP (Border Control Post) locations — in Belfast and Larne.

Medicines and medical devices

A special regime — Northern Ireland applies EU rules on medicines (EMA), while the rest of the UK applies MHRA rules. Pharmaceutical distributors must hold separate licences for NI and GB.

Vehicles and automotive parts

May use the Green Lane, but must comply with both ECE (European) standards and British UKCA standards (for GB). This is important for Polish manufacturers in the automotive sector.

Practical documents for PL → NI exports

How much does exporting to Northern Ireland cost?

The total clearance cost for an export from Poland to Northern Ireland consists of several elements:

• Export clearance (PL/EU): from £45 to £120 — standard export without additional documents.
• T1 transit through GB (if applicable): from £200 to £500 — if the goods travel through English territory.
• ENS Declaration: from £25 to £50 — if the route passes through GB or entry is by sea directly to a UK(NI) port.

Indicative price ranges — exact quote after documents are submitted.

When using the Green Lane the recipient in Northern Ireland pays no UK duty. Under the Red Lane they pay according to the UK Global Tariff (UKGT), typically 0–6.5% of the goods value for industrial products.

Common mistakes made by exporters

1. Missing "UK(NI)" marking on documents — goods automatically go to the Red Lane, generating unnecessary duty costs.
2. Unfamiliarity with SPS rules — food products without a health certificate are held at the border.
3. Confusing the GB→NI route with a direct route — choosing the GB route requires T1, which increases costs and delivery time.
4. Recipient lacking a GB EORI — prevents correct customs settlement on the NI side.

Related articles

• EUR.1 Certificate — when is it required for UK exports?
• ENS Declaration UK — what it is and who submits it