NOT financial advice - seek advice from a professional for your specific situation

    TaxKilnUK tax guidance
    TaxKilnUK tax guidance

    Moving Abroad → USA

    🇺🇸Moving from UK to USA, UK Tax Framework

    The UK-USA emigration corridor is the most complex bilateral in HMRC's network. Roughly 700,000 UK-born people live in the USA, the largest single emigration corridor. Complexity has three sources: the UK-USA DTA's saving clause at Article 1(4), which lets the USA tax its citizens regardless of treaty provisions; the FATCA reporting overlay, parallel to the DTA and not modifiable by it; and the recent March 2025 HMRC interpretation change on Article 17(2) pension lump sums for dual UK/US persons.

    Below is the framework. Residence determination via UK SRT plus US Substantial Presence Test plus Article 4 treaty tie-breaker. DTA mechanics article-by-article. The Article 17(2) March 2025 reversal. FATCA plus Form 8938 plus FBAR overlay. UK-USA Social Security Totalization Agreement 1984. ISA position and the PFIC trap. UK IHT plus US estate tax under the 1978 Estate Tax Treaty. Most UK-side positions are unambiguous within the framework. Qualified dual-jurisdiction UK-USA practitioners exist via CIOT International and AICPA International at appropriate fees for genuinely complex cases, well below the 8k-plus cold-pitch retainer market.

    Roughly 700,000 UK-born residents in the USA, the largest single UK emigration corridor. USA dominates UK emigration commercial flow, the corridor every international tax practitioner knows.

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    Guidance, not advice. We explain the rules, we don't assess your situation. Always seek financial or tax advice from your accountant, or contact HMRC. Read our editorial scope →

    Country overview

    Residence test

    US tax residence is determined by one of three tests. (1) Substantial Presence Test under IRC s.7701(b): a 3-year weighted formula equal to days in current year plus one-third of days in prior year plus one-sixth of days in the year before; 183 or more weighted days equals US tax residence. (2) Green Card holders are US tax residents by default until status is formally terminated. (3) First-year choice election under IRC s.7701(b)(4) with specific conditions. The Closer Connection Exception on Form 8840 can override the Substantial Presence Test in narrow circumstances. Where you are dual-resident under both UK and US domestic tests, the UK-USA DTA Article 4 tie-breaker applies.

    Key tax structures

    Treaty key features

    The framework

    Residence determination, SRT plus SPT plus tie-breaker →

    UK SRT (Schedule 45 FA 2013) determines UK residence; US Substantial Presence Test (IRC s.7701(b)) determines US residence; dual residence is resolved via Article 4 DTA tie-breaker (permanent home, centre of vital interests, habitual abode, nationality, MAP).

    UK-USA DTA mechanics plus saving clause →

    UK-USA DTA 2001 article-by-article: Article 1(4) saving clause, Article 4 residence, Articles 10/11/12 (dividends, interest, royalties), Articles 13/15/17/18 (gains, employment, pensions, government service), Article 24(6)(c) re-sourcing.

    Article 17(2) pension lump sums, March 2025 HMRC change →

    Long-held practitioner reading: lump sums from UK pension to US-resident exempt from US tax, UK-taxable only. HMRC March 2025 update asserts the saving clause overrides this for US citizens UK-resident. Practitioner contestation ongoing; verify per specific case.

    FATCA plus reporting overlay →

    Foreign Account Tax Compliance Act creates parallel reporting obligations: Form 8938 (Statement of Specified Foreign Financial Assets) plus FBAR (FinCEN Form 114). UK-USA IGA (2012) means UK banks report US-person accounts to HMRC and on to the IRS. Independent of the DTA.

    UK-USA Social Security Totalization →

    Totalization Agreement 1984 prevents double Social Security contributions. Certificate of Coverage mechanism. UK State Pension is uprated in the USA (USA is on the uprated list); US Social Security claimable from the UK.

    ISA plus UK savings, the PFIC trap →

    IRS does not recognise the ISA wrapper. ISA holdings in unit trusts, OEICs or ETFs typically constitute PFICs (Passive Foreign Investment Companies) under IRC ss.1291-1298, with punitive tax treatment. Stocks and Shares ISAs holding individual UK shares are not PFICs; cash ISAs are not PFICs but interest is fully US-taxable.

    UK IHT plus US estate tax interaction →

    UK-USA Estate Tax Treaty 1978 (separate from the income tax DTA). US federal estate tax exemption 13.99m USD for 2025 and an increased amount for 2026 under OBBBA (verify). State estate taxes apply in 12 states plus DC. April 2025 UK LTR test changes the UK side dramatically, see /moving-abroad/april-2025-iht-reform-ltr.

    Anti-snake-oil, corridor-specific patterns

    Pattern: Streamlined Filing Compliance Procedures specialist, 5,000 GBP plus

    Reality: IRS Streamlined is a self-serve programme for US persons who failed to file FBAR or 8938. Forms and procedures are publicly available at irs.gov. Genuine dual-jurisdiction CIOT plus AICPA practitioner work is appropriately priced in the 2-5k GBP range for complex cases, not a streamlined-specialist 5k-plus markup.

    Pattern: Roth IRA conversion eliminates UK tax

    Reality: Wrong. The UK tax position on Roth conversions during UK residency is contested; HMRC view is evolving. Substantive conversion decisions warrant a specialist UK-USA practitioner, not a generic Roth specialist cold pitch.

    Pattern: Renounce US citizenship via specialist for 15,000 GBP plus

    Reality: Formal renunciation is processed via a US embassy interview with a 2,350 USD fee (announced reduction to 450 USD effective April 2026, verify before reliance). The application process is largely procedural. Specialist counsel is warranted only for complex citizenship-by-descent or tax-status interactions.

    Pattern: Self-Directed IRA invests in UK property

    Reality: Triggers UBIT (Unrelated Business Income Tax), PFIC issues and prohibited transaction risks. Almost never economically beneficial for retail-tier investors. IRS publications confirm the structural complexity.

    Pattern: FBAR amnesty specialist for 5,000 USD plus

    Reality: IRS Delinquent FBAR Submission Procedures and Streamlined Filing Compliance Procedures are publicly-documented self-serve programmes. Genuine specialist counsel is warranted for criminal exposure or wilful violations, which are a different mechanic from voluntary disclosure.

    Pattern: Dual-filing specialist 8,000 GBP plus retainer

    Reality: Qualified dual-jurisdiction UK-USA practitioners exist via CIOT International and AICPA International Tax sections at appropriate 2-5k GBP fees for typical complexity. Cold-pitch firms charging 8k-plus often subcontract or commoditise the work.

    Free plus regulated-body resources

    Destination-country resources

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