UK-EU Cross-Border Trade for Companies Post-Brexit 2026

Since the United Kingdom formally left the EU Single Market and Customs Union on 1 January 2021, UK private limited companies (Ltd) trading with the European Union operate under the EU-UK Trade and Cooperation Agreement (TCA). By 2026, the framework has stabilised, but compliance obligations remain materially heavier than the pre-Brexit baseline. This deep-dive explains, from a Gyoseishoshi (行政書士) perspective, the operational obligations a UK Ltd must satisfy when moving goods, services, and personnel across the Channel.

1. The Legal Framework — TCA, Windsor Framework, and Domestic Law

Three layers of law govern cross-border trade in 2026:

1. EU-UK Trade and Cooperation Agreement (TCA) — entered into force 1 May 2021. Provides for tariff-free, quota-free trade in goods that meet rules of origin.
2. Windsor Framework (replaced the Northern Ireland Protocol from October 2023) — governs goods moving between Great Britain and Northern Ireland.
3. Domestic UK law — including the Customs and Excise Management Act 1979, the Taxation (Cross-border Trade) Act 2018, and HMRC’s CDS (Customs Declaration Service).

Companies House registration under the Companies Act 2006 (s.7–s.16) does not by itself authorise cross-border trade. Separate authorisations are required from HMRC for customs and VAT purposes.

2. EORI Number — The Entry Ticket

Any UK Ltd moving goods to or from the EU must hold a UK Economic Operators Registration and Identification (EORI) number beginning with GB. Companies trading via Northern Ireland additionally need an XI EORI. EORI is issued free by HMRC and is mandatory for filing customs declarations.

Apply at: https://www.gov.uk/eori

The EORI number is linked to the company’s VAT number (if registered) and Unique Taxpayer Reference (UTR). Trading without one results in shipments being held at the border.

3. Customs Declarations — Import and Export

Both UK and EU sides require declarations for every consignment:

• UK exports to EU — UK export declaration via CDS, plus an EU import declaration filed in the destination Member State.
• UK imports from EU — full customs declaration via CDS. The transitional Staged Customs Controls ended on 31 January 2024; full declarations are now required at the point of import.

The Border Target Operating Model (BTOM), introduced in three phases between January 2024 and October 2024, completed risk-based controls for SPS (sanitary and phytosanitary) goods.

Reference: https://www.gov.uk/government/publications/the-border-target-operating-model

4. Rules of Origin — Earning Tariff-Free Access

The TCA grants zero tariffs only on goods that “originate” in the UK or EU under the rules of origin in Article ORIG.3 of the TCA. A UK Ltd must:

• Determine whether goods are wholly obtained, sufficiently processed, or use cumulation
• Hold a statement on origin or importer’s knowledge as proof
• Retain supporting records for 4 years under TCA Article ORIG.21

Failure to prove origin means the standard MFN tariff applies, often 6–10% for manufactured goods.

5. VAT — A Different World Post-Brexit

Since 1 January 2021, the UK is treated as a third country for EU VAT purposes:

• Goods exports from UK to EU — zero-rated for UK VAT under VAT Act 1994 s.30, but EU import VAT is due in the destination state.
• Distance sales to EU consumers — UK Ltd must either register for VAT in each Member State or use the Import One Stop Shop (IOSS) for low-value consignments under €150.
• Services — generally subject to VAT where the customer is established (place of supply rules).

UK VAT registration threshold remains £90,000 in 2026 (HMRC, raised from £85,000 on 1 April 2024).

Reference: https://www.gov.uk/guidance/vat-eu-country-codes-vat-numbers-and-vat-in-other-languages

6. Posted Workers and Business Travel

A UK Ltd sending employees to the EU for business must consider:

• Schengen 90/180 rule — visa-free for short business visits up to 90 days in any 180-day period
• Posted Workers Directive (Directive 96/71/EC, as amended by 2018/957) — for employees performing services in an EU Member State for over 90 days, host-state employment terms apply
• A1 certificate — under the EU-UK Protocol on Social Security Coordination, an A1 issued by HMRC keeps the worker in the UK National Insurance system for posting up to 24 months

A1 application: https://www.gov.uk/guidance/national-insurance-for-workers-from-the-uk-working-in-the-eea-or-switzerland

7. Data Protection — UK GDPR vs EU GDPR

The European Commission adopted adequacy decisions for the UK on 28 June 2021, allowing personal data to flow from the EU to the UK without additional safeguards. The decision was renewed in 2025 and is currently valid until 27 June 2031, subject to review.

A UK Ltd holding EU personal data must still:

• Comply with EU GDPR for processing carried out in EU
• Appoint an EU representative under Article 27 if offering goods or services to EU data subjects
• Maintain Records of Processing Activities under Article 30

8. Northern Ireland — The Windsor Framework

Goods moving from Great Britain to Northern Ireland use the green lane (no customs declarations for goods staying in the UK internal market) or red lane (full EU customs procedures for goods entering the EU). UK Internal Market Scheme (UKIMS) registration is required to use the green lane.

Reference: https://www.gov.uk/government/publications/the-windsor-framework

9. Common Mistakes — Gyoseishoshi View

10. Compliance Calendar — A UK Ltd Trading with EU

Conclusion — Compliance as Competitive Advantage

For a UK Ltd, post-Brexit cross-border trade is a paperwork exercise that rewards systematic compliance. Companies that invest in customs software, train staff on rules of origin, and integrate VAT and EORI workflows into their finance function ship reliably and avoid the penalty cycles that plague occasional exporters. The legal framework under the Companies Act 2006, Taxation (Cross-border Trade) Act 2018, and the TCA creates a stable, if demanding, environment.

A Gyoseishoshi cannot file UK customs declarations or act as a UK customs intermediary — those are functions of UK-authorised agents. But Scrib🐮 can produce the corporate-side documents (board minutes authorising EORI applications, internal customs procedures, intra-group service agreements with EU subsidiaries) that sit upstream of every cross-border transaction.

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Disclaimer

Legal information, not legal advice. MmowW Scrib🐮 is operated by a licensed Gyoseishoshi (行政書士) office in Japan. We are not UK solicitors.

Sources

• Companies Act 2006: https://www.legislation.gov.uk/ukpga/2006/46/contents
• HMRC EORI: https://www.gov.uk/eori
• Border Target Operating Model: https://www.gov.uk/government/publications/the-border-target-operating-model
• VAT cross-border rules: https://www.gov.uk/guidance/vat-eu-country-codes-vat-numbers-and-vat-in-other-languages
• Windsor Framework: https://www.gov.uk/government/publications/the-windsor-framework