Can UK Companies Expand to the US and Still Qualify for SEIS/EIS?

Expanding into the United States is a natural ambition for many UK startups. The US offers scale, enterprise customers, deep capital markets, and global brand credibility. However, for early-stage founders, one concern often dominates expansion discussions, will US expansion jeopardise SEIS or EIS eligibility? This question matters because SEIS and EIS are often critical to early UK fundraising. Losing eligibility too early can make a company far less attractive to UK angel investors.  

The good news is that UK companies can expand to the US and still qualify for SEIS/EIS , but only if the structure, substance, and timing are handled correctly. This article provides a practical, HMRC-focused guide to UK startup US expansion, explaining how SEIS eligibility for UK companies works when overseas activity is involved, what HMRC looks for, and how founders can expand internationally without breaking UK tax incentives. UCI regularly supports founders as they navigate the balance between growth and compliance. 

What Are SEIS and EIS? 

SEIS (Seed Enterprise Investment Scheme) and EIS (Enterprise Investment Scheme) are UK government initiatives designed to encourage private investment into early-stage, high-risk UK companies. SEIS typically applies to very early startups, while EIS supports slightly more mature but still growth-stage businesses. 

Key differences include

• SEIS – Smaller fundraising limits, younger companies, higher investor tax relief 
• EIS – Larger fundraising rounds, longer trading history allowed 

What many founders overlook is that eligibility must be ongoing, not just valid at the time of investment. HMRC scrutiny increases significantly once a company introduces overseas operations, particularly outside the UK or EU. 

Does Expanding to the US Automatically Disqualify SEIS/EIS? 

No, expanding to the US does not automatically disqualify a company from SEIS or EIS. However, HMRC does not assess eligibility based on geography alone. Instead, it focuses on

• Where the main trade is carried on 
• Where strategic control and decision-making sit 
• Whether overseas entities support or replace the UK trade 

In short, international presence does not equal disqualification, but poor structuring often does. This is why early planning and clear documentation are critical when UK companies expand into the US and rely on SEIS or EIS funding.

HMRC’s Key Tests for SEIS/EIS with Overseas Expansion 

When reviewing SEIS eligibility for UK companies or EIS eligibility for UK companies, HMRC typically applies three core principles. 

• UK Permanent Establishment

The UK company must remain the primary trading entity with a genuine UK permanent establishment. This means

• Core operations remain UK-based 
• The company is not merely a shell holding overseas activity 

This requires demonstrable commercial substance in the UK, including active operations, employees, and decision-making authority. HMRC will closely examine whether the UK entity genuinely carries out the trade or simply exists to preserve SEIS/EIS eligibility.

• Qualifying Trade Test

HMRC assesses whether the overseas operation exists to support the UK business rather than becoming the primary trading entity in its own right. Overseas activity must support the UK trade, not replace it. HMRC looks closely at

• Where revenue is generated 
• Where IP is owned and developed 
• Which entity performs the core value-creating activity 

If the majority of commercial value, customer contracts, or intellectual property shifts overseas, SEIS/EIS eligibility is likely to be challenged. Clear documentation showing that the UK remains the centre of economic activity is critical for ongoing compliance.

• Control & Decision-Making

HMRC places significant weight on where strategic control of the business actually sits, not just where entities are incorporated. Strategic control must remain in the UK, which HMRC typically assesses through:

• UK-based board governance 
• Key commercial decisions made in the UK 
• Founders and senior leadership are not fully relocating decision-making overseas 

If board meetings, investment decisions, product strategy, or IP direction effectively move to the US, HMRC may conclude that the centre of management has shifted abroad. Maintaining documented UK governance, decision records, and board oversight is therefore essential to protect SEIS/EIS eligibility during US expansion.

Common Structures Used for US Expansion and Their Impact 

UK founders typically choose one of the following structures when planning a UK business, SEIS, EIS rules, alongside US expansion. 

This table highlights why US parent structures usually end SEIS/EIS eligibility, while UK-led group structures often preserve it. 

Activities HMRC Commonly Accepts in a US Subsidiary 

HMRC generally allows overseas subsidiaries where their role is clearly supportive and does not shift the core trading activity or value creation away from the UK parent company. HMRC generally accepts US subsidiaries that perform supporting functions, such as

• Sales and business development 
• Marketing and customer success 
• Local compliance and operations 
• Limited R&D support (with caution) 

The key principle is that value creation remains UK-centred, with the US entity enabling growth rather than becoming the core business. 

Activities That Commonly Trigger SEIS/EIS Problems 

SEIS/EIS issues usually arise when overseas expansion alters where real control, value creation, or commercial substance sits within the group. Founders often lose eligibility unintentionally due to

• Transferring core IP to the US 
• Allowing the US entity to become the main revenue generator 
• Relocating senior management decision-making overseas 
• Poor documentation of group purpose and structure 

These are among the most common reasons HMRC challenges UK startup, US expansion structures. 

Advance Assurance – Why It Matters More with US Expansion? 

Advance Assurance is HMRC’s non-binding confirmation that a company should qualify for SEIS or EIS. When US expansion is involved

• Advance Assurance becomes far more important 
• HMRC closely reviews group structure diagrams 
• Vague or poorly explained US activity often leads to delays or rejection 

Founders who expand internationally without updating their Advance Assurance approach often face avoidable investor concerns. 

Investor Perspective – What SEIS/EIS Investors Look For 

From an investor standpoint, overseas expansion is scrutinised closely because it can directly impact the availability of SEIS/EIS tax relief. From an investor standpoint

• US expansion increases perceived risk 
• Clear HMRC-compliant structuring reassures investors 
• Poorly explained overseas entities often trigger red flags during due diligence 

Strong documentation and professional structuring protect not only tax relief, but also investor confidence. 

When Does US Expansion Make SEIS/EIS No Longer Viable? 

For many startups, there comes a natural inflexion point where SEIS/EIS is no longer compatible with the company’s growth trajectory. There is a natural point where SEIS/EIS may no longer be appropriate

• The US becomes the primary market 
• The company transitions to VC-led growth 
• A US parent structure becomes strategically necessary 

This is not a failure, it is often a sign of scale. The key is timing UK fundraising appropriately before crossing this threshold. 

How UCI Helps UK Companies Expand to the US Without Jeopardising SEIS/EIS? 

Expanding internationally while preserving UK tax incentives requires careful structuring, documentation, and ongoing compliance.  UCI supports founders by

• Designing group structures aligned with HMRC expectations 
• Advising on UK holding vs operating company models 
• Structuring US subsidiaries for compliance, not risk 
• Coordinating UK and US tax considerations 
• Supporting Advanced Assurance applications 
• Advising on restructuring as the business scales 

Our role is advisory and compliance-driven, ensuring founders grow internationally without accidentally breaking UK incentives. 

When Founders Should Seek Professional Advice? 

Timing is critical when balancing international growth with SEIS/EIS eligibility, and early decisions can have long-term tax and funding consequences.  Professional advice is strongly recommended

• Before incorporating a US entity 
• Before raising SEIS or EIS funding 
• Before transferring IP or relocating founders 
• When investor due diligence begins 

Early advice is significantly cheaper than restructuring after HMRC scrutiny and helps protect both the founder’s and the investor’s interests. 

Conclusion 

UK companies can expand to the US and still qualify for SEIS/EIS, but only if structure, substance, and governance are carefully planned. HMRC focuses on where the real business is carried on, not simply where customers are located. With the right timing and professional guidance, founders can scale internationally while preserving UK tax incentives. UCI helps startups navigate this balance, enabling confident US expansion without sacrificing SEIS or EIS eligibility.