Foreign-owned affiliates are a big part of the U.S. economy. Majority-owned U.S. affiliates of foreign multinationals employed 8.57 million people in 2024, according to BEA data.
This guide walks UK-based and other foreign parents through the full path: deciding whether a subsidiary fits, forming it, getting operationally ready, validating the setup and staying compliant. Requirements vary by state, activity and current law, so involve U.S. legal, tax, accounting, banking and, where relevant, regulatory advisers alongside your own decision-makers.
Key Takeaways
- A U.S. subsidiary is a separate legal entity, but formation alone does not satisfy tax, banking, licensing or employment rules.
- Pick the entity type and state based on real operations, not filing speed or popularity.
- Get the EIN, governance documents, intercompany agreements and banking materials ready before trading.
- Fintech and crypto firms should treat licensing and sponsor-bank readiness as part of setup.
Setup Guide for a U.S. Subsidiary
The process broadly runs: strategic assessment, entity and state selection, formation and governance, tax and banking setup, operational registrations, then compliance validation.
Timing and cost depend on ownership structure, chosen state, banking requirements, employee locations, regulated activities and whether you are moving staff or intellectual property.
Prerequisites and Strategic Considerations
Settle these facts before filing:
- The parent's ownership percentage and funding model
- Intended U.S. activities and expected customers
- Employee, office and warehouse locations
- Who owns the intellectual property
- Whether the subsidiary will contract directly with U.S. customers
Then compare structures. Each answers a different question, and none is universally best.
| Structure | Liability and tax picture |
|---|---|
| U.S. subsidiary | Separate entity; the parent is not liable merely for owning it, but can be liable for its own conduct. U.S. corporate tax applies at 21%. |
| U.S. branch | The foreign corporation itself operates in the U.S. Effectively connected income is taxed at 21%; the UK treaty caps branch-profits tax at 5% in qualifying cases. |
| Distributor | A commercial arrangement, not an entity. Treaty permanent establishment (PE) risk depends on whether agents are independent or dependent. |
| Employer of record | An employment arrangement. It does not guarantee you avoid PE risk. |
Treaty rates are limits, not automatic outcomes. Dividend withholding under the U.S.-UK treaty is generally capped at 5% or 15%, with a conditional 0% rate that requires, among other things, 80% voting ownership and limitation-on-benefits eligibility.
Also research the current rules for your industry: business licences, money transmission permissions, sanctions, privacy and cybersecurity, consumer protection and sponsor-bank expectations.
Delay filing or launch if any of these are unresolved:
- Unclear ownership
- No cross-border tax analysis
- No plan for funding or repatriating money
- Inconsistent company information
- Thin banking documentation
- Regulated activity with no licensing assessment
Tools and Documents Required
For formation and onboarding, gather:
- Parent constitutional documents and an ownership chart
- Board approval and a business description
- Registered agent details
- Governance documents
- ID for owners and signatories
- Evidence of source of funds
Formation needs the least. Banks ask for more: beneficial-ownership detail, business purpose and expected transaction profiles. Banks must identify each person owning at least 25% plus one control person.
SelectUSA's investor guide notes banks may want a physical U.S. address and an in-person meeting, and account opening can take around three weeks.
Plan for specialists as needed:
- U.S. corporate counsel and cross-border tax advisers
- Payroll providers and immigration counsel
- Licensing counsel and insurance advisers
- Compliance leadership for regulated financial businesses
How to Set Up a U.S. Subsidiary Step-by-Step
Filing before you resolve tax, state registration, banking and compliance questions invites expensive rework. Follow this order:
- Approve the expansion at parent level. Document ownership, authority, funding, purpose and who makes which decisions.
- Choose the entity and state. Compare a corporation and an LLC on tax classification, governance, investment, reporting, treaty treatment and exit options. Forming in the operating state is often simpler than forming elsewhere and foreign-qualifying later. Delaware, for example, lets anyone incorporate regardless of residence.
- File and set up governance. Appoint a registered agent, fix the legal name and principal address, adopt bylaws or an operating agreement, name directors or managers and officers, issue shares or interests, and record capitalisation and the parent's approval.
- Get the EIN and build tax and financial infrastructure. Applicants with no U.S. residence or office use the IRS international telephone route or fax/mail with Form SS-4. Then add state tax registrations, sales-tax and payroll accounts, a bank account, and records of capital contributions or intercompany loans.
- Register wherever you trade. Cover foreign qualification in other states, local licences, employment registrations, insurance, contracts, IP assignments or licences, data protection and industry controls.
One reporting trap: a foreign-owned single-member LLC is disregarded by default and may still need Form 5472 attached to a pro forma Form 1120. The penalty for failing to file starts at $25,000.
Payroll and sales-tax rules are state-specific. California, for instance, requires employer registration within 15 days of paying more than $100 in quarterly wages.
Post-Setup Checks and Validation
Check that these match across every application and system:
- Legal name, ownership and directors or managers
- Addresses, EIN records and bank details
- Tax registrations, licences and contracts
Confirm the subsidiary genuinely operates apart from the parent: its own bank accounts, books, approvals, contracts and documented intercompany transactions. SelectUSA points to separate funds, regular minutes and detailed financial records as practices that help preserve separateness.
Then test readiness before launch:
- Payroll and tax-filing ownership
- Licensing status and policies
- Customer onboarding and transaction monitoring
- Complaints handling, privacy controls and escalation paths
This matters because a legally formed subsidiary can still be unable to bank, hire, contract, collect revenue or lawfully perform regulated activity.
Common Setup Problems and Fixes
Choosing the entity or state without mapping operations
Problem: The parent forms in a popular state without considering where staff, customers, property and regulated activity will sit.
Cause: Treating the filing as the main decision, then overlooking foreign qualification, state tax and licensing.
Fix: Revisit the operating model with corporate and tax advisers. List every state where activity occurs, then complete qualifications, conversions or corrective filings.
California can penalise unqualified foreign corporations up to $20 per day. Formation state rarely drives money-transmitter licensing, which depends mostly on customer location.
Blurring the line between parent and subsidiary
Problem: Shared accounts, contracts, staff or funds weaken liability separation and muddy tax and accounting.
Cause: Informal cross-border management, undocumented capital transfers, unclear signing authority, or using the subsidiary as a billing vehicle.
Fix: Separate the entities in practice as well as on paper:
- Keep separate books and accounts
- Document capitalisation and intercompany arrangements
- Support pricing under IRC Section 482
- Record major decisions
- Make real conduct match the legal structure
Launching without banking, tax, licensing or compliance readiness
Problem: The entity exists but cannot open an account, take payments, hire, meet tax deadlines or carry out regulated activity.
Cause: Banking and regulatory work starts after incorporation, or the parent assumes a U.S. entity may operate nationwide.
Fix: Build a pre-launch checklist covering:
- Bank due diligence
- Federal and state tax accounts
- Payroll, licences and insurance
- Privacy and cybersecurity
- BSA/AML and sanctions controls
- Sponsor-bank requirements
Verify current rules with the relevant authorities.
Pro Tips for Setting Up a U.S. Subsidiary Effectively
- Run one integrated launch plan with owners and deadlines for formation, tax, banking, state registrations, employment, contracts, insurance, licensing and compliance.
- Keep a single entity file holding the parent resolution, formation certificate, governance documents, capitalisation records, ownership chart, EIN confirmation, bank documents, intercompany agreements, licences and renewal dates.
- Assess compliance readiness before launch if you are in fintech, crypto, money transmission, banking or embedded finance. FinCEN MSB registration does not replace state licensing.
- Track state money-transmission rules through CSBS: 31 states had adopted its model law in full or part.
- Bring in fractional compliance leadership (CCO, BSA Officer, CAMLO, CRO, MLRO) for director-led cover without a full-time hire. Fraxtional’s foreign-company U.S. support also covers contracts, governance, regulatory readiness and sponsor-bank prep, which can take two to three months.
- Reassess the structure when you add employees, enter a new state, change products, hold customer funds, expand payment flows, transfer IP, raise capital or sign with a sponsor bank. A mid-application pivot may mean updating or refiling in some states.
Conclusion
Forming the entity is only the first milestone. The subsidiary also has to be governed, funded, banked, registered, licensed, staffed, and monitored.
Plan the legal, tax, operational, and compliance model together. That way the U.S. subsidiary supports growth instead of creating avoidable liability, reporting duties, or regulatory exposure.
Frequently Asked Questions
How can I set up a US company from the UK?
Get parent-level approval, choose the U.S. entity type and state, file formation documents, obtain an EIN, then open a bank account and complete tax and state registrations. Assess U.S. employment, licensing and cross-border tax needs alongside.
What is a US subsidiary?
It is a separate U.S. legal entity owned or controlled by a foreign parent. It has its own governance, liabilities, records, tax obligations and operational responsibilities.
Can a foreign company own a US company?
Generally yes. Citizenship or residency is not required to own a U.S. entity. Ownership records, banking due diligence, tax reporting, sector restrictions and national-security or regulated-industry reviews such as CFIUS may apply.
Can a foreigner create an LLC in the US?
Generally yes. Foreign-owned LLCs raise questions on tax classification, information reporting, banking, state registration and home-country tax treatment, so get professional review.
Which type of company registration is best?
There is no universal answer. Compare a corporation and an LLC on investment plans, governance, tax classification, foreign-parent reporting, liability, state operations and long-term goals.
Can a subsidiary of a foreign company be a small company?
Yes. A subsidiary can be small in headcount, revenue or operations and still carry corporate, tax, banking, employment, licensing and ongoing compliance obligations.
