Windsor Framework 2026: what changes for companies operating with Northern Ireland

Key data

Companies operating between the EU, Great Britain and Northern Ireland have new regulations to review. Decision 1/2026 of the Joint Committee of the Withdrawal Agreement, adopted on 2 February 2026 and published on 19 May 2026, incorporates a new EU legislative act into Annex 2 of the Windsor Framework.

This is not a minor procedural change. The Windsor Framework functions as the regulatory bridge that keeps Northern Ireland aligned with the European single market. Each time a new act is incorporated into Annex 2, that act becomes mandatory in Northern Ireland, regardless of what the rest of the United Kingdom decides.

For any operator with commercial flows crossing that regulatory border, this update may imply new product requirements, changes in customs documentation or adjustments in the supply chain.

What does this regulation establish?

The UK Withdrawal Agreement includes a dynamic update mechanism that allows the Joint Committee to incorporate new European legislation into the Windsor Framework without the need to renegotiate the entire agreement. Decision 1/2026 activates precisely that mechanism.

The practical result is that the EU act incorporated into Annex 2 of the Windsor Framework becomes integrated into the legal order applicable to Northern Ireland. Northern Ireland remains part of the United Kingdom politically, but in the areas covered by the Windsor Framework it continues to apply the regulations of the European single market.

The areas directly affected by this type of update are:

• Product regulation and compliance requirements for goods circulating between Great Britain, Northern Ireland and the EU
• Customs procedures and documentation in the movement of goods
• Supply chains that include operations in or through Northern Ireland
• Regulatory alignment of Northern Ireland with the European single market in the covered areas

To find out the specific act incorporated in this decision, it is necessary to consult the full text of Decision 1/2026 on EUR-Lex, where the specific regulations added to Annex 2 are detailed.

Economic and operational impact

The concrete impact depends on the incorporated act. However, the pattern of this type of Windsor Framework updates generates the following operational effects on a recurring basis:

The dynamic incorporation mechanism implies that these updates are recurring. Companies with operations in Northern Ireland cannot treat each Joint Committee decision as an isolated event: they are part of an ongoing process of regulatory alignment that requires systematic monitoring.

Who does it affect?

• Spanish and European companies that export products to Northern Ireland or the United Kingdom with transit through Northern Ireland
• Importers receiving goods from Northern Ireland or from Great Britain destined for the EU
• Logistics operators and freight forwarders with routes including ports or border crossings in Northern Ireland
• Manufacturers whose products are distributed in the Northern Ireland market and must comply with EU regulations
• Legal advisors, compliance officers and CFOs of companies with operations in the EU-Northern Ireland-Great Britain corridor
• Companies with supply contracts that include compliance clauses linked to the Windsor Framework

Practical example

A Spanish industrial equipment manufacturer that sells its products in Northern Ireland must comply with European marking and conformity regulations, not with general British regulations. When the Joint Committee incorporates a new act into Annex 2 of the Windsor Framework, that manufacturer must verify whether the act affects the category of its products.

If the act incorporated by Decision 1/2026 modifies, for example, technical or labelling requirements in a specific sector, the manufacturer will have to update its conformity documentation, its technical data sheets and possibly its production processes for batches destined for the Northern Ireland market, even though those same products sold in Great Britain remain subject to British regulations.

This scenario of dual regulatory standards within the same country is precisely the complexity that the Windsor Framework manages, and that each update of Annex 2 can intensify or modify for specific sectors.

What should companies do now?

1. Consult the full text of Decision 1/2026 on EUR-Lex to identify the specific act incorporated into Annex 2 of the Windsor Framework and determine whether it affects your sector or type of product.
2. Review your commercial flows with Northern Ireland: map what products, in what volumes and with what frequency cross the regulatory border between Great Britain, Northern Ireland and the EU.
3. Assess the impact on supply chain and customs: verify whether the incorporated act modifies documentation, certification or compliance requirements applicable to your operations as of 2 February 2026.
4. Update contracts and compliance clauses: if you have commercial agreements with clauses linked to regulatory compliance in Northern Ireland, review whether this update activates any contractual obligation.
5. Establish a Windsor Framework monitoring system: incorporations into Annex 2 are recurring. Implement a process to monitor Joint Committee decisions and assess their impact systematically, not reactively.