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Decision · country verdict

Should you form a US LLC if you live in the UK?

Conditional, leaning no. HMRC's default treatment of a US LLC is opaque — same as a foreign corporation. That clashes with the IRS treatment of a single-member or partnership LLC as transparent. The result is the same hybrid-mismatch problem Canadian residents face: UK denies foreign tax credit for US tax paid on flow-through profits, because HMRC sees the same income as a dividend from a foreign company. The Anson v HMRC Supreme Court ruling carved out a narrow exception for operating agreements drafted to give the member a "direct claim" to profits as they arise — but most off-the-shelf LLC operating agreements don't qualify, and HMRC has resisted broad application of the case. The April 2025 abolition of the UK's non-domiciled regime closed an adjacent shelter. For most UK residents the LLC is the wrong tool unless the operating agreement is professionally drafted to mirror Anson and you can afford the tax opinion to back it up.

What this verdict applies to: UK tax residents (including UK-resident-but-non-domiciled, post-April 2025) who would own a US single-member LLC or be a partner in a multi-member LLC. Does not apply to UK citizens who are US tax residents abroad — different rules.

Why

UK and US classification of the same entity rarely match. The IRS treats a single-member US LLC as a disregarded entity by default — profits flow to your personal return as if the LLC didn't exist. Multi-member LLCs default to partnership treatment, with K-1 attribution to each partner whether or not cash was distributed.

HMRC, by contrast, classifies a US LLC under its "opaque vs. transparent" test by looking at the entity's legal substance under the law of the formation state. The standard HMRC position is that Delaware, Wyoming, and most other US LLCs are opaque — the LLC owns its own assets, is liable for its own debts, has perpetual existence, and the member's interest is closer to corporate shareholding than partnership participation. Under that classification, profits don't exist on the UK member's return until the LLC distributes them, at which point they're treated as dividends from a foreign company.

The damage:

  • You pay US tax on the LLC's profits as they arise (because the IRS sees you as the taxpayer).
  • You don't recognise the income on your UK return until distribution, but HMRC may still refuse to credit the US tax against the eventual UK tax — arguing the US tax was on personal income, the UK tax is on a dividend, and the two don't match.
  • Even when the LLC retains profits, the underlying US tax has been paid by you personally with no UK relief in sight.

The Anson v HMRC [2015] UKSC 44 decision is the only meaningful exception in the modern era. Mr Anson, a member of a Delaware LLC, argued his operating agreement gave him a direct entitlement to profits as they arose — making the LLC functionally a partnership for UK purposes. The Supreme Court agreed on his facts. HMRC's reaction was minimal: rather than rewriting its general guidance, HMRC has continued to treat Anson as a fact-specific decision and applies the default opaque classification to most LLCs.

The April 6, 2025 abolition of the non-domiciled regime is a separate but related tightening. Pre-2025, UK-resident non-doms could shelter foreign income and gains held in offshore vehicles — including US LLCs — from UK tax until remitted. Post-2025, foreign income and gains for long-term UK residents are taxed on an arising basis. This closes a planning route some non-dom LLC holders relied on.

When the verdict flips

Four real cases where forming a US LLC can still make sense for a UK resident.

1. Your operating agreement is professionally drafted to mirror Anson. This means engaging a UK tax barrister or specialist firm to draft (or redraft) the operating agreement so that the member's right to profits is direct, immediate, and proprietary — not contingent on a distribution decision. Plus a tax opinion supporting the transparent classification. Realistic cost: £3,000–£8,000 for the drafting and opinion. Worth it only if the underlying business income justifies it, typically £100K+ annually.

2. You're imminently moving to the US. If you become a US tax resident within 12–18 months, the LLC becomes useful as a pre-positioned operating entity. Form it timed to your move and accept the brief UK-resident period as a transitional issue.

3. The LLC is held within a wrapping UK structure. Some advisers structure an LLC inside a UK LLP or a UK corporate vehicle to manage the classification mismatch. These structures are bespoke, expensive to maintain, and only economical at meaningful income levels.

4. The LLC has no UK-relevant income. If the LLC is purely a vehicle for US-source passive income (a single US rental property, US securities) with no distributions back to the UK, the friction may not bite hard enough to matter. Most readers in this situation actually want a UK property-investment structure, not a US one.

Outside these cases, the verdict is don't form one.

What to do instead

For most UK residents earning from a US-facing business, the cleaner path is one of the following.

UK Limited Company (Ltd) for the business operation. This is the default UK small-business vehicle. Corporation tax is 25% on profits over £250K, 19% on profits under £50K (with marginal relief in between). US-source income is handled through normal UK foreign-income rules, with foreign tax credit relief that actually applies because the entity types match. Dividends to you personally are taxed in the standard UK dividend bands.

Sole trader if you're early-stage. If you're earning under roughly £80K from US clients, run as a sole trader on Self Assessment first. Incorporate when the tax savings justify the compliance cost — typically around the £60–80K profit mark depending on your other income.

Specialist UK cross-border tax adviser before you make any structural decision. This is not a list-of-providers situation. A 90-minute consultation with Bright!Tax, Frank Hirth, Sterling Tax Services, Buzzacott, or another specialist with US-UK depth will produce a defensible structure for your specific facts and will catch the hybrid-mismatch trap before you trip on it.

Frequently asked

Should I form a US C-Corp instead? Sometimes. A US C-Corp is opaque on both sides — the IRS treats it as a corporation, HMRC treats it as a corporation. No hybrid mismatch. The trade is corporate-level double taxation (US corporate tax + UK tax on dividends) and CFC attribution risk under the UK's Controlled Foreign Company rules if you're the sole shareholder. For active business income at small scale, this is usually worse than a UK Ltd. For venture-track startups raising US capital, it's the standard answer.

What if I "check the box" on my LLC to elect corporation treatment in the US? That changes the IRS-side classification, but it doesn't change HMRC's view of the entity. You'd then have a US corporation taxed both by the IRS and (potentially) by HMRC, with additional CFC analysis. Not a fix for the hybrid mismatch; usually a worse outcome.

Does Wyoming, Delaware, or New Mexico avoid this? No. HMRC's classification depends on the entity's legal substance under the law of the formation state, but the general "opaque" classification applies across the common US LLC states. State of formation doesn't change the analysis.

I have US clients only. Do I even need a US entity? Usually no. Invoice from your UK Ltd or as a sole trader. UK invoicing to US clients is normal commercial practice and US clients generally have no preference. A US bank account or a multi-currency provider like Wise handles USD receipts cleanly.

The April 2025 non-dom changes — what do they mean for an existing LLC? If you were relying on the remittance basis to defer UK tax on retained LLC profits, that route is closed for long-term residents from April 6, 2025. Worldwide income and gains are now taxable on the arising basis. Existing LLC holders should review with a specialist before the first full post-reform tax year closes.

Sources

  1. Anson v Commissioners for Her Majesty's Revenue and Customs [2015] UKSC 44. Supreme Court ruling on US LLC classification for UK tax purposes. last_verified: 2026-05-28.
  2. terms.law. "UK Founders: UK-US Tax Treaty." last_verified: 2026-05-28. https://terms.law/UK-Founders/uk-us-tax-treaty.html
  3. Bright!Tax. "US-UK Tax Treaty Explained." last_verified: 2026-05-28. https://brighttax.com/blog/us-uk-tax-treaty/
  4. Birketts LLP. "US-UK Family Investment Companies and Limited Partnerships." last_verified: 2026-05-28. https://www.birketts.co.uk/legal-update/us-uk-family-investment-companies-and-limited-partnerships/
  5. HMRC International Manual, INTM180000 series (classification of foreign entities). last_verified: 2026-05-28.
  6. UK Finance Act 2025, non-domiciled regime abolition provisions (effective April 6, 2025).

This page was last updated 2026-05-28. UK tax law on foreign entity classification turns on fact-specific analysis. Verify current treatment with a specialist UK cross-border tax adviser before forming any entity.

Jurisdiction: United Kingdom · US federal. Last updated 2026-05-28.