US Expat Tax Services Pre-Arrival Planning for UK Move |

US Expat Tax Services Pre-Arrival Planning for UK Move |

US Expat Tax Services: Pre-Arrival Planning for UK Move

US Expat Tax Services: Tax Planning Before Moving to the UK

US expat tax services for Americans who are planning to move to the United Kingdom addresses the pre-arrival planning phase as one of the highest-value engagements in cross-border tax — because the decisions made in the weeks and months before the UK arrival date create the framework within which every subsequent year of UK residence will be taxed, and several of those decisions cannot be made retrospectively once UK residence has begun. The state income tax domicile change — establishing a no-income-tax state domicile before the UK move — must happen before the departure date, not after. The realisation of US investment gains — selling appreciated US securities before UK residence begins — must be completed before the first day of UK residence, when those gains become potentially UK-taxable. The dollar cost basis documentation for any US home being retained or sold — the completion-day exchange rate and the total acquisition cost in dollars — must be confirmed at completion. Furthermore, many Americans who move to the UK without pre-arrival US expat tax services discover these missed opportunities only in their first or second UK tax year — when the window for the pre-arrival actions has already closed. Additionally, the Finance Act 2025 Foreign Income and Gains regime provides a four-year exemption from UK tax on foreign income and gains for qualifying new UK residents — but the qualification depends on the specific residence history in the ten years before the UK arrival, which must be confirmed before the move. Consequently, pre-arrival US expat tax services for a UK-bound American is a time-critical engagement that must begin at least three to six months before the planned arrival date — not after the decision to move has been made.

Confirming the FIG Regime Eligibility

The Ten-Year Non-Residence Test

The Finance Act 2025 FIG regime is available to individuals who have not been UK-resident in any of the ten tax years immediately preceding the tax year of first UK residence — providing a four-year exemption from UK income tax and CGT on foreign income and gains. Furthermore, for a US citizen who has never previously lived in the United Kingdom, the ten-year non-residence condition is straightforwardly met — ten years of non-UK-residence is confirmed from the absence of any prior UK residence. Additionally, where a US citizen has previously lived in the UK — perhaps as a student or on an earlier work assignment — the specific year-by-year residence history for the preceding ten years must be confirmed using the UK statutory residence test to determine whether any of those years constituted UK residence under the test. Consequently, US expat tax services confirm the FIG regime eligibility for every new UK arrival client at the start of the pre-arrival engagement — reviewing the prior residence history against the statutory residence test before advising on whether the four-year exemption period is available. The HMRC FIG guidance is at https://www.gov.uk/government/publications/changes-to-the-taxation-of-non-uk-domiciled-individuals.

What the FIG Regime Means for US Income

Where the FIG regime is available, foreign income and gains during the four-year exemption period are exempt from UK income tax and CGT — including US salary earned in the US before the UK move, US investment income, US rental income, and gains on US assets realised during the UK residence period. Furthermore, the FIG regime does not affect any US tax obligations — the Form 1040 on worldwide income, the FBAR, and all US information returns continue to apply from the first year of UK residence. Additionally, the FIG election must be made each year on the UK self-assessment — it is not automatic — and making the election forfeits the UK personal allowance in the year the election is made. Consequently, US expat tax services model the combined UK and US tax position with and without the FIG election for each year of the qualifying period — confirming that the UK tax saving from the FIG exemption exceeds the personal allowance foregone before advising the client to make the election. The IRS Form 1040 guidance is at https://www.irs.gov/forms-pubs/about-form-1040.

Realising US Capital Gains Before UK Arrival

Why Timing Matters for Capital Gains

Capital gains on US investments realised before the UK arrival date are not subject to UK CGT — since the individual was not UK-resident when the gains arose. Furthermore, the same gains realised on the day after UK residence begins may be subject to UK CGT — since the individual is now a UK resident, and UK CGT applies to worldwide gains from the first day of UK residence. Additionally, for investments with significant unrealised gains — appreciated US securities, US real property, US company shares — realising those gains before UK residence begins can permanently avoid the UK CGT on those gains. Consequently,US expat tax services advise every pre-arrival client to review their US investment portfolio for unrealised gains — calculating the US capital gains tax that would arise from selling before the UK move versus the combined US and UK CGT that would arise from holding the same investments in the UK residence period. The IRS capital gains guidance is at https://www.irs.gov/taxtopics/tc409.

The US Capital Gains Tax Cost of Pre-Arrival Sales

Selling appreciated US investments before the UK move triggers US capital gains tax — at 0%, 15%, or 20% for long-term holdings, plus the 3.8% net investment income tax. Furthermore, the US capital gains tax on a pre-arrival sale is a one-time cost that eliminates the ongoing UK CGT exposure on the same assets going forward. Additionally, where the FIG regime is available for the first four years of UK residence, even post-arrival gains on overseas assets would be FIG-exempt, reducing the urgency of pre-arrival sales for assets that are clearly within the FIG qualifying period. Consequently, US expat tax services model the tax cost of each investment scenario — pre-arrival US sale only, post-arrival FIG-exempt UK period, and post-FIG-period UK and US combined — to determine the optimal timing for each asset category. The FIG regime interaction with capital gains planning is one of the most valuable pre-arrival US expat tax services for high-net-worth UK-bound Americans.

State Tax Domicile Change Before Departure

California and New York: The High-Stakes States

Americans moving to the UK from California or New York must establish a new state domicile before the UK departure date — or risk continued state income tax obligations on UK employment income during the UK residence period. Furthermore, California treats state domicile as continuing until the taxpayer takes specific affirmative steps to change it — changing the driving licence, voter registration, and primary address to another state before the UK departure. Additionally, a no-income-tax state domicile — typically Texas or Florida — eliminates California or New York state income tax on all non-source income from the date of domicile change. Consequently, US expat tax services advise every California or New York client moving to the UK to complete the state domicile change mechanics before the UK arrival date — treating this as a pre-arrival action item with a firm deadline. The California FTB guidance is at https://www.ftb.ca.gov.

Departure Year Part-Year State Return

In the year of departure, a part-year state return is required for any state with income tax, covering the income earned during the in-state period from 1 January to the date of departure. Furthermore, the part-year state return confirms the departure date and establishes the non-resident filing history that supports future non-residency claims if challenged by the state. Additionally, any California or New York source income — rental income from a retained property, capital gains from state-source assets — continues to require a non-resident state return for every year that income arises after departure. Consequently, the departure year US expat tax services package includes the part-year state return as a mandatory deliverable alongside the departure year federal Form 1040. The California FTB non-resident guidance is at https://www.ftb.ca.gov.

US Account Actions Before UK Arrival

US IRA and 401(k) Considerations

Americans moving to the UK should confirm their US retirement account strategy before departure, since the UK treatment of US IRA and 401(k) distributions changes based on residency status and the treaty position. Furthermore, during UK residence, IRA distributions are taxable only in the United Kingdom under Article 17(1) of the US-UK treaty — excluded from the US return on Form 8833 where the treaty position is correctly claimed. Additionally, where a Roth IRA conversion is being considered — converting a traditional IRA to a Roth to eliminate future required minimum distributions — this conversion should be executed before UK residence begins, since the conversion income is US-taxable but not UK-taxable when made before UK residence. Consequently, US expat tax services advise pre-arrival clients on the Roth conversion timing decision — modelling the US income tax cost of the conversion before UK arrival against the long-term benefit of tax-free Roth distributions during and after the UK residence period. The IRS IRA guidance is at https://www.irs.gov/retirement-plans/iras.

Documenting Dollar Cost Basis for US Property

Where the UK-bound American owns US property that they are selling before or during the move — or retaining as a rental property — the dollar cost basis must be confirmed and documented before any sale or change of use. Furthermore, the dollar cost basis of US property is the total acquisition cost in US dollars — including the purchase price, closing costs, and any capital improvements — established at the date of acquisition and used for every future Schedule D calculation. Additionally, where the US property will be converted from a primary residence to a rental during the UK residence period, the conversion-date market value must be documented — since the depreciation basis for Schedule E rental purposes is the lower of the cost basis or the fair market value at the conversion date. Consequently, US expat tax services advise pre-arrival clients to confirm and document the dollar cost basis of all US property before the UK arrival date — treating this as a permanent tax record that cannot be accurately reconstructed after the fact. The IRS cost basis guidance is at https://www.irs.gov/taxtopics/tc703.

FBAR Obligations From Day One of UK Residence

The FBAR Obligation Begins Immediately

The FBAR obligation begins from the first calendar year in which the US citizen has a financial interest in or signature authority over foreign financial accounts where the aggregate exceeded $10,000 at any point during the year. Furthermore, for a US citizen who moves to the UK in March and opens a UK bank account to receive their first UK salary payment, the FBAR obligation for that year begins from the date the UK account is opened — not from the end of the UK tax year or from the point at which the account exceeds any individual balance threshold. Additionally, the aggregate threshold for the FBAR — $10,000 across all foreign financial accounts — is easily met in the first year of UK residence once any meaningful income is received into the UK account. Consequently, US expat tax services advise every UK-bound American that the FBAR obligation begins in the calendar year of arrival — and that the first-year FBAR must be prepared and filed alongside the first-year Form 1040 for the UK residence period. The FinCEN FBAR guidance is at https://www.fincen.gov/financial-crimes-enforcement-network/fbar.

Case Study: Pre-Arrival Planning, California Departure

Our team advised a US citizen who was relocating from San Francisco to London for a permanent role with a UK employer. Furthermore, she had a California driver's licence, was registered to vote in California, and had no other state connections. Her investment portfolio included a US brokerage account with approximately $180,000 of unrealised long-term capital gains, a traditional IRA worth approximately $95,000, and a San Francisco condominium worth approximately $620,000 with a dollar cost basis of $295,000.

The pre-arrival US expat tax services package addressed the following actions before the UK arrival date. Texas domicile established first — new Texas driver's licence, Texas voter registration at her parents' address, Texas bank account opened. Furthermore, the California part-year return for the departure year was scheduled. Investment portfolio review: the $180,000 of unrealised long-term gains were modelled — US capital gains tax at 23.8% (20% plus NIIT) = approximately $42,840. Post-arrival with FIG regime (first four years): the same gains would be FIG-exempt for four years but taxable from year five. The recommendation was to sell the most appreciated positions before UK arrival — realising approximately $120,000 of the gain and paying approximately $28,560 US CGT. The remaining $60,000 of gains in positions held for the FIG period were retained for post-arrival FIG-period realisation. Additionally, Roth IRA conversion of $25,000 — taxable in the US at 22% ($5,500) before UK arrival rather than during UK residence when the conversion income would carry no UK foreign tax credit. The San Francisco condominium was retained as a rental property — conversion-date fair market value of $620,000 documented as the Schedule E depreciation basis (lower of cost or fair market value, both at $620,000 in this case). Consequently, the pre-arrival US expat tax services engagement saved this client from continuing California income tax obligations, optimised the capital gains strategy across the FIG period, and documented every cost basis record before the UK arrival date.

Common Pre-Arrival Planning Mistakes

Not Changing State Domicile Before Departure

The most expensive missed pre-arrival step for California and New York residents is not completing the state domicile change before the UK arrival date — allowing state income tax to continue applying to UK employment income. Furthermore, state domicile cannot be changed retrospectively after the UK arrival — the steps must be completed in the prior state before the departure. The correct approach requires US expat tax services to complete the domicile change mechanics — driving licence, voter registration, and address — at least thirty days before the UK arrival date.

Not Confirming FIG Regime Eligibility

Many Americans moving to the UK for the first time assume FIG eligibility without confirming the ten-year non-residence history — missing the opportunity where they qualify, or incorrectly claiming the election where a prior UK residence period disqualifies them. Furthermore, the statutory residence test analysis for prior UK residency years requires reviewing each year individually. The correct approach requires US expat tax services to confirm FIG eligibility from the specific residence history before the UK arrival date. HMRC FIG guidance is at https://www.gov.uk/government/publications/changes-to-the-taxation-of-non-uk-domiciled-individuals.

Not Documenting Dollar Cost Basis Before Arrival

Failing to document the dollar cost basis of US investments and property before the UK arrival date creates permanent record-keeping gaps that become costly at disposal. Furthermore, the acquisition-date exchange rates and total acquisition costs must be confirmed from contemporaneous records, and UK HMRC can request evidence of the cost basis on any future disposal. The correct approach requires US expat tax services to confirm and document the dollar cost basis for all significant assets before the UK arrival date — treating the pre-arrival documentation as a permanent tax record. IRS cost basis guidance is at https://www.irs.gov/taxtopics/tc703.

How US-UK Tax Can Help

At US-UK Tax, our team of Enrolled Agents, Chartered Tax Advisers, and Certified Public Accountants provides specialist pre-arrival US expat tax services for Americans moving to the United Kingdom. Furthermore, we confirm FIG regime eligibility from the ten-year residence history, model the capital gains strategy for US investments across the FIG period, advise on state domicile change mechanics for California and New York clients, advise on Roth IRA conversion timing before departure, document the dollar cost basis of all US property and investments before arrival, confirm the FBAR obligation timeline from the first year of UK residence, and prepare the departure year federal and state returns. Additionally, we establish the annual compliance framework — Form 1040, UK self-assessment, FBAR, and all required information returns — from the first year of UK residence.

Contact our team today. Email hello@us-uktax.com call 0333-8807974, or visit https://www.us-uktax.com/contact/.

Conclusion

Pre-arrival US expat tax services for Americans moving to the United Kingdom are the highest-value engagement in cross-border tax, because the decisions made before the UK arrival date create the permanent tax framework for every subsequent year of residence, and those decisions cannot be reversed after the arrival date has passed. Furthermore, the state domicile change before departure, the capital gains realisation strategy relative to the FIG period, the Roth IRA conversion timing, and the dollar cost basis documentation of all US assets are all pre-arrival actions with post-arrival consequences. Moreover, the FBAR obligation begins in the calendar year of UK arrival — from the date the first UK account is opened — making the first-year compliance planning an immediate obligation rather than a deferred consideration. Contact US-UK Tax at hello@us-uktax.com or call 0333-8807974 today.

Contact Us

US-UK Tax | hello@us-uktax.com | 0333-8807974

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FAQs

Q: What is the FIG regime, and who qualifies?

A: The Finance Act 2025 Foreign Income and Gains regime exempts foreign income and gains from UK tax for the first four tax years of UK residence — available to individuals who have not been UK-resident in any of the preceding ten tax years. It must be elected annually on the UK self-assessment, and the personal allowance is foregone in the year the election is made.

Q: Should I sell US investments before moving to the UK?

A: It depends on the unrealised gain, the US capital gains tax cost, and whether the FIG regime is available. Where FIG is available, overseas gains during the four-year qualifying period are UK-exempt. Where the gains will arise after the FIG period, pre-arrival realisation may be more tax-efficient. Modelling both scenarios for each asset is essential.

Q: Must I change my state domicile before moving to the UK?

A: For California and New York residents — yes, if you want to eliminate ongoing state income tax obligations. Simply moving to the UK does not change state domicile. Establishing a no-income-tax state domicile (Texas or Florida) before the UK arrival date requires changing the driver's licence, voter registration, and primary address.

Q: When does the FBAR obligation begin for a new UK resident?

A: From the calendar year in which the first UK foreign financial account is opened, and the aggregate of all foreign financial accounts exceeds $10,000. For most Americans who move to the UK and open a current account to receive a salary, the FBAR obligation begins in the calendar year of arrival.

Q: Should I convert my IRA to Roth before moving to the UK?

A: Potentially. A Roth conversion before UK arrival triggers US income tax in the US only — with no UK tax since the individual is not yet UK-resident. A conversion during UK residence may generate income that the UK will tax. The optimal timing depends on the conversion amount, the US marginal rate, and the anticipated UK tax position.

Q: How do I document the dollar cost basis of my US home before moving?

A: Confirm the total acquisition cost in US dollars — purchase price, closing costs, and capital improvements — at the acquisition date. Where the home is being converted to a rental during UK residence, document the fair market value at the conversion date as the potential depreciation basis. Retain all documentation permanently alongside the title deeds.