UK-US treaty: status and key articles
The UK-US double taxation convention is one of the most comprehensive globally. Current version dates to 2001 with subsequent protocols. Coverage includes income tax, capital gains, dividend withholding, royalties, interest, pensions, and tax residency tie-breakers.
- Article 7 (Business Profits): UK-resident business profits are taxable only in the UK unless attributable to a US permanent establishment.
- Article 10 (Dividends): 0% in qualifying parent-subsidiary cases and qualified pension funds. 5% for 10%+ ownership. 15% standard.
- Article 11 (Interest): 0% on most portfolio interest.
- Article 12 (Royalties): 0% on most royalty types. One of the most generous globally.
- Article 24 (Relief from Double Taxation): FTC mechanism for UK residents on any US tax paid.
Withholding rates by income type for UK residents
| Income type | Default US rate | UK treaty rate |
|---|---|---|
| US-source dividends (qualified parent-sub) | 30% | 0% |
| US-source dividends (10%+ ownership) | 30% | 5% |
| US-source dividends (standard) | 30% | 15% |
| US-source portfolio interest | 30% | 0% |
| US-source royalties | 30% | 0% |
| Business profits without US PE | Generally not taxed | Generally not taxed (Article 7) |
| ECI from US trade or business | Graduated US rates | Not reduced by treaty |
How HMRC treats US LLCs
HMRC's treatment of US LLCs is nuanced. The longstanding position (since the Anson v. HMRC Supreme Court ruling in 2015) is fact-specific: HMRC may treat a US LLC as opaque (taxed as a company) or transparent (taxed as a partnership) depending on the LLC's actual rights and the member's relationship to its income.
In Anson, the Supreme Court held that the Delaware LLC in question was transparent because the member had an immediate right to LLC profits, not a right to a distribution from a separate entity. Single-member Wyoming LLCs with proper operating agreements generally lean transparent under the Anson analysis, but HMRC has not issued a categorical rule.
Practical effect: speak to a UK accountant who knows US LLC structures. Some founders use specific operating-agreement language to support transparent treatment. Others convert to LTD or use C-Corp structures to avoid the ambiguity.
How to file W-8BEN-E from the UK
- Line 1: Beneficial owner name (your LLC name)
- Line 4: Chapter 3 status: Disregarded Entity
- Line 5: Country of residence: United Kingdom
- Line 6: Permanent residence address in the UK
- Line 8: US TIN (your EIN)
- Line 9: Foreign TIN (your UK UTR or NI number)
- Part III: Claim treaty benefits, cite Article 10 for dividends. For 0% qualifying claims, attach supporting documentation.
- Submit to each US payer (Stripe, AdSense, YouTube, sponsors). Renew every 3 years.
Common mistakes by UK founders
- Assuming HMRC will treat your LLC as transparent without verifying the Anson analysis
- Not filing W-8BEN-E with US payers (30% default applies)
- Missing Form 5472 + pro forma 1120 ($25K penalty)
- Not disclosing the LLC on UK self-assessment (foreign income, possibly Foreign pages)
- Triggering Class 4 National Insurance Contributions on transparent LLC income without budgeting for it
- Confusing the W-8BEN (individual) with W-8BEN-E (entity)