Are you planning to set up a UK company from the USA, hire in London or use the UK as a base for European growth? The structure you choose now can shape your liability, tax position, banking, fundraising and compliance for years.
For most US founders building a genuine UK operation, a UK private limited company : commonly called a UK Ltd subsidiary : offers the cleaner long-term platform. A branch can be faster and simpler for testing the market, but it leaves the US parent more exposed.
This guide compares both options in practical commercial terms, so you can decide how to open a UK company from the USA with greater confidence.
Important: UK-US expansion involves company law, corporation tax, VAT, employment obligations and potentially US tax considerations. Treat this as a decision guide, not a substitute for tailored legal or tax advice.
What is the difference between a UK subsidiary and a UK branch?
A UK subsidiary is a new UK company incorporated at Companies House. It is legally separate from the US parent, even if the US parent owns 100% of its shares.
A UK branch, formally registered as a UK establishment of an overseas company, is not a separate legal entity. It is the existing US company operating in the UK.
| Consideration | UK subsidiary : Ltd | UK branch : UK establishment |
|---|---|---|
| Legal identity | Separate UK company | Extension of the US company |
| Liability | UK Ltd is generally responsible for its own debts | US parent remains directly liable |
| Contracts | Signed by the UK company | Signed by the US company or its UK establishment |
| Corporation tax | Usually UK tax resident and taxable on worldwide profits, subject to treaty rules and reliefs | Generally taxable on profits attributable to the UK permanent establishment |
| Companies House filings | UK accounts and confirmation statement | Overseas company information and accounting documents may need filing |
| Fundraising | Better suited to UK equity investment and SEIS/EIS planning | Does not issue separate shares |
| Hiring | UK employer obligations sit with the Ltd | UK employer obligations sit with the branch or parent structure |
| Market perception | Familiar to UK banks, suppliers and investors | May appear more temporary or directly tied to the US parent |
| Set-up | Often quick once information is ready | Can take longer because overseas company documents are reviewed |
| Best suited to | A committed, scalable UK operation | Testing demand or maintaining a closely controlled UK presence |
When is a UK Ltd subsidiary the better choice?
A UK subsidiary is usually the stronger option when you expect to:
- Hire UK employees or build a local management team.
- Sign material customer, supplier or partnership contracts in the UK.
- Raise UK investment or grant employee share options.
- Claim UK R&D tax relief for qualifying development work.
- Separate UK commercial risk from the US parent.
- Build a UK balance sheet that investors and lenders can assess.
- Operate as a lasting part of the group rather than a short-term experiment.
The subsidiary can sign its own contracts, open its own bank account and maintain distinct accounting records. That separation creates a clearer operating model : although the US parent may still be asked for guarantees, particularly when the Ltd is new.
For technology businesses, this structure can also make funding preparation more straightforward. SEIS and EIS are designed around qualifying UK companies issuing shares to investors. A branch does not issue its own shares, so it is rarely the practical vehicle for a UK fundraising round.
The key is to establish the UK company with a sensible share structure from day one. This may include the US parent as shareholder, an option pool for UK employees, and sufficient flexibility for future investment.
When might a UK branch be appropriate?
A branch may be worth considering when your UK activity is limited, closely controlled by the US parent or still at an early market-testing stage.
For example, you might use a branch where you are:
- Conducting initial business development.
- Supporting existing UK customers from the US.
- Maintaining a small local presence.
- Avoiding a separate UK subsidiary while commercial demand is uncertain.
- Comfortable with the US company carrying UK liabilities.
A branch can avoid duplicating some company structures. However, this does not mean it avoids UK compliance. You may still need Companies House registration, UK corporation tax reporting, VAT registration, payroll, pension administration and appropriate records.
And because the branch is not separate, a contract dispute, unpaid supplier balance or employment claim can reach the US parent directly.
Tax, permanent establishment and intercompany charges
Corporation tax is one of the most important differences in a UK company structure for foreign owners.
A UK-resident Ltd is generally within UK corporation tax on its worldwide profits, subject to the UK-US tax treaty, foreign tax credits and the company’s detailed residence position.
A non-UK-resident US company with a UK branch is generally taxed on profits attributable to its UK activities. The challenge is determining what profit the UK operation has actually generated.
This is where permanent establishment, or PE, matters. HMRC guidance indicates that a non-resident company can have a UK PE where it has a fixed place of business, such as an office, or an agent who habitually exercises authority to do business on its behalf. A branch is an obvious example, but the facts matter.
A US company should not assume that calling UK staff “sales support” prevents a PE. Their authority, contracts, location and day-to-day activities all need review.
For a subsidiary, charges from the US parent : such as management services, software licences, intellectual property or financing : should be documented and priced on an arm’s-length basis. For a branch, the issue is generally the attribution of profits and expenses to the UK PE, alongside any arrangements with other group entities.
This is why we encourage founders to agree the operating model, intercompany agreements and pricing policy before money starts moving between the US and UK.
VAT, payroll and hiring
Both structures can create UK VAT obligations. The standard VAT registration threshold is £90,000 of taxable turnover over a rolling 12-month period, or an expectation that turnover will exceed that amount in the next 30 days.
However, a US business supplying goods or services in the UK may need to register as a non-established taxable person even below the normal threshold, depending on the nature of its supplies. Review the VAT position before issuing your first UK invoice.
If you employ people in the UK, you will normally need to consider:
- PAYE registration and payroll reporting.
- Employer National Insurance contributions.
- Workplace pension auto-enrolment.
- Employers’ Liability insurance.
- UK employment contracts and policies.
- Benefits, expenses and equity compensation.
The legal employer must be clear. A UK Ltd can employ staff directly. A branch may employ them through the overseas company’s UK establishment, but the compliance and tax analysis can be more involved.
Our payroll and pension service can help you establish a reliable monthly process as your UK team grows.
R&D tax relief and investor readiness
If your UK team is solving genuine technological uncertainties, the UK entity may be able to claim R&D tax relief. HMRC says a qualifying project must seek an advance in science or technology and address technological uncertainty.
The company claiming relief must be within the charge to UK corporation tax, and the work, costs and decision-making need to be documented. A UK subsidiary carrying out and funding the R&D is often easier to analyse than a branch with shared people, costs and intellectual property.
Read our R&D tax credit service and the official HMRC R&D tax relief guidance.
If UK fundraising is part of your plan, a subsidiary is normally the preferred structure. It can issue shares, establish an option arrangement and prepare for SEIS/EIS analysis. But incorporation alone does not guarantee eligibility. The company, trade, shares, use of funds and investor circumstances must all meet the relevant conditions.
A practical decision framework
Choose a UK Ltd subsidiary if most of these statements are true:
- You expect to hire locally or build a UK operating team.
- You want limited liability between UK activity and the US parent.
- You may raise UK equity or grant employee options.
- You are planning R&D work in the UK.
- You want a durable UK presence that can scale.
Consider a UK branch if:
- Your UK activity is genuinely small or exploratory.
- The US parent wants direct ownership and operational control.
- You accept that UK liabilities remain with the US company.
- Separate UK fundraising is not part of the plan.
- You are prepared to file and manage UK obligations for the overseas company.
Recommended implementation timeline
| Timing | Recommended action |
|---|---|
| Week 1 | Confirm commercial objectives, ownership, directors, contracts, staffing and tax assumptions |
| Week 1–2 | Choose Ltd or branch; review PE, VAT, transfer pricing and US-UK tax implications |
| Week 2 | Prepare incorporation or overseas establishment documents |
| Week 2–3 | Register with Companies House and establish accounting records |
| Week 3–4 | Open banking, configure cloud accounting and document intercompany arrangements |
| Month 1–2 | Register for VAT or PAYE where required; set up payroll and pension processes |
| Ongoing | Maintain bookkeeping, management reporting, filings, tax planning and investor records |
Pre-incorporation checklist
Before you open a UK company from the USA, confirm:
- Proposed UK company name and SIC code.
- Registered office and UK correspondence arrangements.
- Directors, shareholders and people with significant control.
- Parent-to-subsidiary ownership and funding route.
- Contracting entity for UK customers and suppliers.
- Who owns the intellectual property and employs the team.
- Permanent establishment risk for the US company.
- VAT treatment and registration requirements.
- Payroll, pension and Employers’ Liability insurance.
- Intercompany services, royalties, loans and cost allocations.
- R&D record-keeping and potential claim ownership.
- SEIS/EIS and employee option objectives.
- UK accounting, corporation tax and Companies House filing calendar.
FAQs
Can a US company own 100% of a UK Ltd?
Yes. A US company can generally be the shareholder of a UK private limited company. The UK company still needs its own directors, statutory records, accounts and compliance processes.
Can I move my US company directly to the UK?
Usually not. You normally create a new UK subsidiary or register a UK establishment of the US company. The appropriate route depends on your legal, tax and commercial objectives.
Is a UK branch cheaper than a subsidiary?
It may be cheaper to establish in some cases, but the overall cost depends on accounting, tax, payroll, Companies House filings, banking and group reporting. A branch is not a way to remove UK compliance.
Which structure is better for SEIS or EIS?
A UK Ltd subsidiary is normally the practical vehicle because it can issue shares. Eligibility must be reviewed against current HMRC conditions before fundraising.
Can a UK branch claim R&D tax relief?
Potentially, where the relevant company is within the UK corporation tax charge and the activities and costs qualify. The analysis can be more complex than for a UK subsidiary.
Start your UK expansion with the right foundation
The right answer is not simply “branch versus Ltd”. It is about liability, control, tax, people, contracts and your next funding milestone.
At Price & Accountants, we help US founders and international businesses build practical UK finance systems : from company accounts and bookkeeping to VAT, payroll, R&D claims, share structures and investor preparation.
Explore how we work with start-ups, or contact us for a UK entity and cross-border finance review before you incorporate.
Official references
- Business.gov.uk: Set up and register your business in the UK
- GOV.UK: Register a private limited company
- GOV.UK: Corporation Tax
- GOV.UK: When to register for VAT
- HMRC: Permanent establishment guidance
- HMRC: R&D tax relief
- GOV.UK: Transfer pricing guidance
- GOV.UK: Enterprise Investment Scheme
- GOV.UK: Seed Enterprise Investment Scheme
Meta title: UK Subsidiary Formation for US Founders: Branch vs Ltd
Meta description: Compare a UK subsidiary and branch for your US company expansion. Explore liability, tax, VAT, hiring, R&D, SEIS/EIS and compliance.