US Expat Tax Services Pre-Arrival Planning |

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

US Expat Tax Services: Pre-Arrival Planning | US-UK Tax

US Expat Tax Services for Non-Dom Business Owners

US expat tax services are most valuable when engaged before you arrive in the UK — not after. Most non-domiciled business owners make costly tax mistakes in their first year simply because they moved without specialist pre-arrival advice. Furthermore, the Finance Act 2025 abolished the UK remittance basis from April 2025, making pre-arrival planning more critical than ever. Arriving in the UK without a structured plan now means your worldwide assets, offshore business income, and existing trusts may be exposed to UK tax from day one. Additionally, the new four-year Foreign Income and Gains regime offers genuine relief — but only if you qualify as a new resident and structure your affairs correctly before arrival. This guide explains exactly what non-dom business owners need to do before setting foot in the UK, and why the right specialist advice before arrival saves significantly more tax than any retrospective planning after the fact. It is written for US citizens, international business owners, and dual nationals planning to move to the UK.

What Pre-Arrival Tax Planning Means for Business Owners

The Four-Year FIG Regime and Why Timing Matters

The Foreign Income and Gains regime replaces the old remittance basis. It exempts foreign income and gains from UK tax for the first four tax years of UK residence — but only where you have not been UK resident in any of the preceding ten tax years. Furthermore, the clock starts from the first day you become a UK resident under the Statutory Residence Test. Consequently, if you arrive mid-year, your four-year window starts that partial year. Therefore, timing your arrival to coincide with the start of the UK tax year — 6 April — maximizes the benefit of each FIG year. Additionally, any foreign income arising before UK residence is not subject to UK tax. The HMRC guidance on the FIG regime is at https://www.gov.uk/government/publications/changes-to-the-taxation-of-non-uk-domiciled-individuals.

Protecting Offshore Business Structures Before Arrival

Non-dom business owners often hold interests in offshore companies, family trusts, and investment vehicles. Moreover, once you become a UK resident, those structures may immediately fall within UK tax rules — including the UK's controlled foreign company rules, the transfer of assets abroad provisions, and the settlor-interested trust regime. Accordingly, restructuring offshore holdings before arrival is far simpler and less costly than doing so after UK residence begins. Specifically, shares held in offshore companies may become subject to UK income tax on undistributed profits once the owner is a UK resident. The correct approach is to review every offshore entity you hold before arrival and take specialist advice on its UK tax treatment from day one of residence. The IRS guidance on foreign earned income is at https://www.irs.gov/individuals/international-taxpayers/foreign-earned-income-exclusion.

US Reporting Obligations That Continue During UK Residence

If you are a US citizen or green card holder moving to the UK, your US tax obligations do not stop. Furthermore, you must continue to file Form 1040 annually, report all worldwide income, and file FBARs for all foreign financial accounts — including the UK bank accounts you will open after arrival. Additionally, the UK income tax you pay can be claimed as a foreign tax credit on the US return, preventing double taxation. However, the foreign tax credit calculation requires careful coordination between the UK self-assessment and the US Form 1040. Consequently, engaging US expat tax services that handle both the UK and US returns as a single coordinated engagement is essential from year one. The FBAR guidance is at https://www.irs.gov/businesses/small-businesses-self-employed/report-of-foreign-bank-and-financial-accounts-fbar.

Pre-Arrival Planning: Five Steps for Non-Dom Business Owners

Step One: Confirm Your Qualifying New Resident Status

Before relying on the FIG regime, confirm that you have not been a UK resident in any of the 10 tax years immediately preceding your arrival year. Furthermore, even a single UK tax year of residence in the prior decade disqualifies you from FIG relief. Accordingly, review your full UK residence history — including any years spent in the UK for work, study, or family reasons — and obtain a formal residence status opinion before planning your arrival date. The HMRC statutory residence test guidance is at https://www.gov.uk/government/publications/rdr3-statutory-residence-test-srt.

Step Two: Review and Restructure Offshore Holdings

Identify every offshore entity, trust, investment account, and business interest you hold. Moreover, assess how each will be treated under UK tax rules once you become resident. Specifically, offshore companies in which you are a director or a majority shareholder may become CFCs under UK rules. Additionally, offshore trusts in which you are the settlor may trigger the UK settlor-interested trust income attribution rules. The correct approach is to restructure before arrival — not after — because restructuring post-arrival may itself trigger UK tax charges. Engage a dual-qualified adviser who understands both UK trust tax and US grantor trust rules simultaneously. The HMRC guidance on offshore trusts is at https://www.gov.uk/hmrc-internal-manuals/trusts-settlements-and-estates-manual/tsem9120.

Step Three: Establish the Inheritance Tax Position

From April 2025, UK IHT applies to all worldwide assets of long-term UK residents — those who have been UK residents for ten or more of the preceding twenty tax years. Furthermore, once you cross that threshold, your offshore business interests, foreign property, and overseas investments all fall within the UK IHT net. Consequently, the pre-arrival period is the ideal time to put in place lifetime planning structures — including irrevocable trusts, gifts, and the restructuring of offshore assets — before UK residence begins and any IHT exposure arises. The HMRC IHT guidance is at https://www.gov.uk/inheritance-tax.

Step Four: Set Up the US Return Framework for Year One

Your first UK tax year is also a US tax year. Therefore, establish the foreign tax credit framework before arrival — so that UK PAYE tax, UK self-employment tax, and any UK corporate tax you pay can be properly credited against the US income tax on the same income. Additionally, if you will claim Overseas Workday Relief for any days worked outside the UK during the assignment, confirm the OWR eligibility and set up the day-counting system from day one. Furthermore, open a separate UK current account for each business entity to simplify the FBAR balance calculation at year-end. The IRS foreign tax credit guidance is at https://www.irs.gov/individuals/international-taxpayers/foreign-tax-credit.

Step Five: Engage Dual-Qualified Advisers Before Arrival

The single most valuable pre-arrival action is engaging US expat tax services that are dual-qualified in both UK and US tax before you land. Moreover, the adviser should be a Chartered Tax Adviser under the CIOT for UK purposes and an Enrolled Agent or CPA for US purposes. Specifically, the first-year UK self-assessment and the US Form 1040 for the arrival year are the most complex returns you will file — because they must correctly apply the FIG regime, the split-year UK residence rules, the OWR day count, the foreign tax credit, and any FBAR and Form 8938 obligations simultaneously. Accordingly, get the specialist team in place before you arrive, not after your first UK tax return is overdue. The AICPA guidance on international tax is at https://www.aicpa.org.

Case Study: US Business Owner Plans UK Arrival Correctly

Our team was engaged six months before a U.S. citizen technology entrepreneur planned to move from San Francisco to London. He held a 60% stake in a Delaware C-corporation, a Cayman investment vehicle, and personal US brokerage accounts totaling approximately $2.4 million. Furthermore, he had no prior UK residence, so he qualified for the full four-year FIG regime.

Specifically, we advised him to take a qualifying distribution from the Delaware corporation before arrival — extracting retained profits as a US dividend at preferential US rates before UK tax applied to future distributions. Additionally, we restructured the Cayman vehicle into an excluded property trust before his arrival date, protecting those assets from UK IHT for the duration of his UK residence. Moreover, we confirmed his OWR eligibility, established the day-counting protocol for overseas workdays, and set up the foreign tax credit calculation template linking his UK self-assessment to his US Form 1040.

Consequently, in his first UK tax year, the net UK and US combined tax on his £380,000 of UK employment income was approximately £142,000 — compared with an estimated £198,000 had he arrived without pre-arrival planning. Furthermore, the Cayman trust restructure protected approximately $1.8 million in assets from a potential UK IHT exposure of £720,000 over the following decade. The entire pre-arrival planning engagement took three months and cost a fraction of the tax saved in year one alone.

Common Pre-Arrival Mistakes Non-Dom Business Owners Make

Arriving Before Reviewing Offshore Structures

Many non-dom business owners move to the UK without reviewing their offshore holding companies, investment vehicles, and family trusts. Furthermore, once UK residence begins, those structures may immediately attract UK income tax on undistributed profits, UK capital gains tax on asset disposals, and UK IHT risk on the owner's death. The correct approach is to obtain a full offshore structure review at least three months before arrival — not three months after.

Missing the Qualifying New Resident Test

The FIG regime applies only to those who have not been UK residents in any of the preceding 10 tax years. Consequently, even a single prior year of UK residence — for a postgraduate degree, a secondment, or a family visit that tipped the residence test — can disqualify a business owner from the entire four-year regime. The correct approach is to review the full UK residence history and obtain formal statutory residence test advice before assuming FIG eligibility. The HMRC SRT guidance is at https://www.gov.uk/government/publications/rdr3-statutory-residence-test-srt.

Failing to Open Separate Business and Personal Accounts

FBAR requires reporting of all foreign financial accounts with an aggregate balance exceeding $10,000. Furthermore, mixing business and personal funds in a single UK account makes the FBAR balance calculation complex and may overstate the reportable balance. Additionally, offshore business accounts in which a US person has signature authority are FBAR-reportable — even when not personally owned. The correct approach is to open separate accounts for each purpose before the first FBAR reporting year begins.

Not Claiming OWR From Year One

Overseas Workday Relief exempts the proportion of employment income relating to duties performed outside the UK from UK income tax — but only if claimed correctly from the first day of UK residence. Moreover, many business owners on international assignments travel extensively and have significant OWR-eligible days. Furthermore, the employer must apply OWR through payroll in real time to maximize benefits. The correct approach is to confirm OWR eligibility before arrival and implement the day-counting system from day one. The HMRC OWR guidance is at https://www.gov.uk/guidance/overseas-workday-relief.

How US-UK Tax Can Help

At US-UK Tax, our team of Enrolled Agents, Chartered Tax Advisers, and Certified Public Accountants provides specialist US expat tax services for non-dom business owners planning a UK move. Furthermore, we conduct the full pre-arrival review — offshore structure analysis, FIG eligibility confirmation, IHT exposure modeling, US return framework setup, and OWR claim preparation — as a single coordinated engagement. Additionally, we prepare both the first-year UK self-assessment and the US Form 1040 in coordination, ensuring the foreign tax credit calculation, OWR day count, and FIG treatment are all applied correctly from the outset.

Contact our team today for a confidential pre-arrival consultation. Email hello@us-uktax.com, call 0333-8807974, or visit https://www.us-uktax.com/contact/.

Conclusion

Pre-arrival planning is the highest-value intervention available to non-dom business owners moving to the UK. The four-year FIG regime, offshore trust restructuring, and IHT planning are all significantly more effective — and less costly — when implemented before UK residence begins. Furthermore, US expat tax services that are dual-qualified in both UK and US tax are essential for ensuring the first-year returns are correct in both jurisdictions. Moreover, the FA 2025 changes make the stakes higher than ever — arriving without a plan now means worldwide assets are exposed to UK tax from day one. Contact US-UK Tax at hello@us-uktax.com or call 0333-8807974 today.

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FAQs

Q: What is the FIG regime and who qualifies for it?

A: The Foreign Income and Gains regime exempts overseas income and gains from UK tax for the first four years of UK residence. You must not have been a UK resident in any of the preceding ten tax years to qualify.

Q: Do I still need to file US returns after moving to the UK?

A: Yes. US citizens and green card holders must file Form 1040 annually regardless of where they live. UK income tax paid can be claimed as a foreign tax credit to reduce the US tax on the same income.

Q: When should I start pre-arrival tax planning?

A: At least three to six months before your planned UK arrival date. Offshore restructuring, trust arrangements, and FIG eligibility reviews all take time and cannot be done retrospectively without additional cost.

Q: Does the FA 2025 non-dom abolition affect my pre-arrival planning?

A: Yes, significantly. The remittance basis no longer exists. The FIG regime now applies instead, but only for the first four years and only if you meet the ten-year non-residence test. Pre-arrival review is now more critical than ever.

Q: What offshore structures should I review before arriving in the UK?

A: Review all offshore companies, family trusts, investment vehicles, and business partnerships. Once UK residents, these may be subject to UK income tax, CGT, or IHT. Restructuring before arrival is simpler and less costly than after.

Q: Can I claim Overseas Workday Relief as a non-dom business owner?

A: Yes, if you are a qualifying new UK resident under the FIG regime and perform employment duties outside the UK. OWR must be claimed from year one, and the overseas day count must be maintained throughout the year.