Brexit turned a UK company into a third-country entity in Europe. Spain — the EU's fourth-largest economy and the UK's largest EU investment relationship — is the most logical way back in, with one of the most favourable treaties available. And a permanent-establishment risk most founders never see coming.
Before January 2021, a UK company sold services across the EU under one legal framework, invoiced within a unified VAT system, passported financial services, and was recognised through a branch or subsidiary across all 27 states. That ended. Today a UK company in Europe is a third-country entity: no single-market freedoms, no EU-wide licensing, and each member state navigated individually. For a business with European clients, suppliers or ambitions, the UK company alone is no longer a sufficient European vehicle. The response has been consistent — establish an EU legal entity. The question is where.
Ireland is the instinctive answer — English-speaking, common law — but heavily competed for by US multinationals, which has pushed up costs and complexity for smaller businesses. The Netherlands is the classic holding jurisdiction, with excellent treaties, but demands real substance and operates in Dutch, culturally distant from the UK context.
Spain sits differently. The EU's fourth-largest economy — €1.4 trillion GDP, 47 million consumers — with high business-level English in Madrid and Barcelona. The UK-Spain relationship is the largest of any EU country by investment volume: UK companies invested a record €12.4 billion in Spain in 2024, about a third of all inbound FDI. And on the treaty, Spain is by a wide margin the most favourable EU jurisdiction for a UK company — a fact most British founders and advisers have not fully absorbed.
The UK-Spain Double Taxation Agreement remains fully in force post-Brexit — Brexit changed the UK's relationship with EU law, not the bilateral treaty, which is a separate instrument between the two governments. The rates are exceptional.
| Income type | Condition | Rate |
|---|---|---|
| Dividends | Corporate owner holding ≥ 10% of capital | 0% |
| Dividends | General rate | 10% |
| Dividends | From a Spanish REIT / SOCIMI | 15% |
| Interest | Taxable only in the recipient's state | 0% |
| Royalties | Taxable only in the recipient's state | 0% |
Zero withholding on interest and royalties is the headline — and these are full exemptions, not reduced rates. Royalties from a Spanish subsidiary to a UK parent (IP, software, patents, trademarks, know-how) carry no Spanish withholding; intercompany interest is treated the same. For dividends, a UK company owning 10%+ of the SL pays zero — which covers most subsidiary structures. In terms of bilateral treaty efficiency into any EU jurisdiction, this is among the best a UK business can access.
This is what separates the companies that enter Spain correctly from those that create expensive problems. Permanent establishment (PE) determines when a UK company's activity in Spain becomes taxable in Spain — even without a Spanish legal entity. Create a PE, and Spain taxes the profits attributable to that activity, regardless of whether you incorporated anything.
Post-Brexit, with more British employees and managers working remotely from Spain — Digital Nomad Visa holders, relocated family, employees who simply moved — PE exposure has become a live operational risk. The triggers are well defined:
The fix is not to avoid having people in Spain. It is to structure the arrangement: define roles and decision authority, document where contracts are concluded, keep activity below the PE threshold — and where genuine Spanish activity exists, formalise it through a properly structured SL rather than letting a de facto PE develop without governance.
For UK-owned Spanish companies, banking is among the more manageable non-EU founder profiles. UK source-of-funds documentation, company accounts and HMRC filings are well understood by Spanish banks; no FATF complications, no elevated country risk. The one specific consideration is the post-Brexit financial-services gap: UK firms that relied on EU licences or passporting can no longer do so for Spanish operations, and a UK-regulated financial business may need a Spanish licence depending on the actual activities. For non-financial businesses — consulting, technology, professional services, trading, digital — no Spanish licence is required and the standard KYC framework applies.
In May 2025 the UK and EU concluded a broad bilateral reset — the most significant development in UK-EU relations since Brexit — with enhanced provisions on mutual recognition, regulatory cooperation and trade facilitation. Spain, one of the UK's largest EU relationships, is a direct beneficiary. It does not restore single-market membership or passporting, but it removes friction in specific areas — data adequacy, professional-qualification recognition, certain regulatory alignment — that directly affect how UK businesses operate through Spanish entities. For a UK founder weighing a Spanish presence, the 2025 context is more favourable than at any point since January 2021.
The treaty is generous and the bilateral context is improving — but the outcome turns on structure, PE and documentation being settled up front. That is what defines a UK-Spain setup that works from day one.
A Spanish subsidiary restores an EU footing for your UK company — and the treaty rates only apply once the entity exists. Fixed price, fully remote.