US and UK Tax Specialists for Wealthy Families: Pre-Immigration Tax Planning Guide

Introduction

Moving country with significant wealth is never just a relocation exercise. It is a tax event, a reporting event, and often a succession planning event all at once. That is why many families now search for US and UK tax specialists for wealthy families before they change residence, move capital, or bring assets into a new jurisdiction.

The timing matters more in 2026 because the UK has replaced the old remittance basis with a residence-based foreign income and gains regime from 6 April 2025, while the United States continues to tax US citizens and US tax residents on worldwide income and to require extensive foreign asset reporting. Families who act before arrival can often simplify structures, reduce friction, and avoid costly cleanup later. (GOV.UK)

This guide is for wealthy families, founders, investors, directors, family office decision-makers, and internationally mobile individuals who want to understand what should be reviewed before becoming UK or US tax residents. It explains the real risks, the strategic planning points, and why US and UK tax specialists for wealthy families should be involved before the move, rather than after. (IRS)

Why pre-immigration tax planning matters more now

Pre-immigration planning works because tax treatment often changes sharply on the day residence starts. In the UK, the Statutory Residence Test decides residence year by year,. From6 April 2025, the UK shifted away from the old domicile-driven remittance basis to a residence-based system with a four-year foreign income and gains relief for eligible new arrivals. That means timing, source analysis, and asset segregation all matter before UK residence begins. http://www.gov.uk/government/publications/rdr3-statutory-residence-test-srt http://www.gov.uk/guidance/check-if-you-can-claim-the-4-year-foreign-income-and-gains-regime http://www.gov.uk/guidance/remittance-basis-changes (GOV.UK)

In the United States, new immigrants who become US tax residents are generally brought into a worldwide income and reporting regime. The IRS states that US tax residents and citizens must report worldwide income, including foreign trusts and foreign bank and securities accounts. Families who become residents first and plan later often discover that they have imported tax inefficiencies, reporting burdens, and legacy structures that no longer fit. http://www.irs.gov/individuals/international-taxpayers/tax-information-and-responsibilities-for-new-immigrants-to-the-united-states http://www.irs.gov/individuals/international-taxpayers/frequently-asked-questions-about-international-individual-tax-matters (IRS)

This is the central commercial reason wealthy families seek US and UK tax specialists early. Proper advice before arrival can change the tax result. Post-arrival advice usually focuses on damage limitation. That difference directly affects liquidity, succession plans, investment returns, and family governance. (GOV.UK)

The first issue: determine exactly when tax residence starts

Residence is not a soft concept. It is a technical trigger. In the UK, the Statutory Residence Test uses day counts, ties, and automatic UK or overseas tests. A family can assume they are “not really resident yet” and still fail the analysis. In practice, that mistake can pull gains, income, and remittances into the wrong year. http://www.gov.uk/government/publications/rdr3-statutory-residence-test-srt http://www.gov.uk/hmrc-internal-manuals/residence-and-fig-regime-manual/rfig20320 (GOV.UK)

For a move to the United States, a family also needs to analyze when US tax residency begins under the relevant rules, as from that point worldwide reporting obligations may apply. This affects foreign investment income, trust distributions, gifts from non-US persons, and account reporting. http://www.irs.gov/individuals/international-taxpayers/tax-information-and-responsibilities-for-new-immigrants-to-the-united-states http://www.irs.gov/forms-pubs/about-form-3520 (IRS)

A serious pre-immigration engagement, therefore, starts with dates, not products. Before anyone discusses trusts, companies, or pensions, the adviser should map residency triggers, entry dates, family travel patterns, and which family members will become resident first.

The second issue: understand how the UK rules changed in 2025

Many wealthy families still discuss UK planning using the language of non-dom status. That is outdated. HMRC now states that from 6 April 2025 the remittance basis will be abolished and replaced by a foreign income and gains regime based on tax residence. HMRC also states that all UK residents are taxed on the arising basis on worldwide income and gains unless they qualify for the new relief. http://www.gov.uk/government/publications/foreign-income-and-gains-fig-regime-self-assessment-helpsheet-hs266/hs266-foreign-income-and-gains-fig-regime-2026 http://www.gov.uk/government/publications/remittance-basis-hs264-self-assessment-helpsheet/hs264-remittance-of-pre-6-april-2025-foreign-income-and-gains-and-the-temporary-repatriation-facility-trf http://www.gov.uk/guidance/deemed-domicile-rules (GOV.UK)

For eligible new arrivals, HMRC says the four-year foreign income and gains regime can give relief for foreign income and gains if the individual has not been a UK resident in any of the ten consecutive tax years before arrival. That is highly relevant for wealthy families moving to London or relocating family members to the UK. It creates planning opportunities, but only if the assets, income streams, and anticipated disposals are reviewed before residence begins. http://www.gov.uk/guidance/check-if-you-can-claim-the-4-year-foreign-income-and-gains-regime (GOV.UK)

This change alone explains why US and UK tax specialists for wealthy families are in demand. Advice based on old non-dom assumptions can now be wrong. Families need current planning, not recycled commentary.

The third issue: review foreign income, unrealised gains, and liquidity before the move

A pre-immigration plan should identify what the family owns, where it sits, and what taxable events are already embedded in the portfolio. That includes private company shares, funds, carried interests, real estate, trusts, life policies, deferred compensation, pension rights, and family loans.

Why does this matter? Because a disposal before becoming a resident can yield a completely different outcome than one after becoming a resident. In the UK, temporary non-residence rules can also bring gains back into charge in some cases, so timing must be planned carefully rather than casually. HMRC’s 2026 help sheet on temporary non-residents confirms that specific rules can catch gains during a period of temporary non-residence. http://www.gov.uk/government/publications/temporary-non-residents-and-capital-gains-tax-hs278-self-assessment-helpsheet/hs278-temporary-non-residents-and-capital-gains-tax-2026 (GOV.UK)

For a move into the United States, the same logic applies. Once US tax residence begins, foreign investment income and certain trust or gift events can fall into the US reporting net. Families who ignore this often create taxable income or reporting obligations that could have been managed before entry. http://www.irs.gov/individuals/international-taxpayers/tax-information-and-responsibilities-for-new-immigrants-to-the-united-states http://www.irs.gov/businesses/gifts-from-foreign-person (IRS)

This is where US and UK tax specialists for wealthy families deliver real value: not by filling in forms later, but by deciding whether income should be realized, deferred, segregated, or restructured before the family becomes resident.

Trusts, gifts, and succession planning must be reviewed before relocation

Trusts often sit at the center of wealthy family planning. They also create some of the most complex cross-border problems. A structure that works cleanly in one country can become a reporting headache in another.

The IRS states that Form 3520 is used to report transactions with foreign trusts and the receipt of certain foreign gifts, and its international business guidance confirms that a US person may have a Form 3520 filing obligation in connection with foreign trusts. That means a family moving into the United States with offshore trusts or receiving trust distributions must review the structure before arrival. http://www.irs.gov/forms-pubs/about-form-3520 http://www.irs.gov/businesses/international-businesses/foreign-trust-reporting-requirements-and-tax-consequences http://www.irs.gov/instructions/i3520 (IRS)

On the UK side, HMRC’s 2026 help sheet on transfers of assets abroad and non-resident trusts shows that these regimes remain highly relevant in practice. Families that assume a foreign trust “sits outside the UK” without a deeper review can make expensive mistakes. http://www.gov.uk/government/publications/income-and-benefits-from-transfers-of-assets-abroad-and-income-from-non-resident-trusts-hs262-self-assessment-helpsheet/hs262-income-and-benefits-from-transfers-of-assets-abroad-and-income-from-non-resident-trusts-2026 (GOV.UK)

Pre-immigration planning should therefore review settlors, beneficiaries, trustees, distribution policies, loans, powers, letters of wishes, and embedded gains. It should also ask a strategic family question: Is the current structure still the right one for the jurisdiction the family is entering?

Family investment companies, holding structures, and governance

Some wealthy families prefer companies over trusts for governance, control, or succession reasons. In the UK, ICAEW has highlighted practical care points around family investment companies and notes that advisers must consider their tax implications, benefits, drawbacks, and lifecycle. http://www.icaew.com/technical/tax/tax-faculty/taxline/articles/2025/why-you-should-take-care-with-family-investment-companies http://www.icaew.com/technical/business/business-start-up-and-finance/family-businesses (ICAEW)

This does not mean a family investment company is automatically right. It means structure matters. Share classes, control, extraction policy, residence, financing, and future transfers all need to be modeled before the family migrates.

Companies House becomes relevant where UK corporate structures are used as part of a family governance or investment framework, because legal form and ongoing reporting discipline matter as much as tax efficiency. http://www.gov.uk/government/organisations/companies-house (GOV.UK)

A strong adviser will connect governance with tax. Families do not only need lower taxes. They need clarity in decision-making, controlled wealth transfer, and structures that the next generation can actually operate.

Global transparency has made informal planning obsolete.

Families sometimes believe they can sort reporting after the move and keep legacy accounts or structures largely unchanged. That approach is far riskier than it was a decade ago. The OECD’s Common Reporting Standard is designed for the automatic exchange of financial account information between jurisdictions, and the OECD’s exchange relationship materials show the breadth of these information-sharing networks. http://www.oecd.org/en/publications/consolidated-text-of-the-common-reporting-standard-2025_055664b1-en.html http://www.oecd.org/en/topics/sub-issues/international-standards-on-tax-transparency/automatic-exchange-of-information-exchange-relationships.html (OECD)

The United States also continues to require foreign financial account reporting through the FBAR regime and related international disclosures. http://www.irs.gov/individuals/international-taxpayers/frequently-asked-questions-about-international-individual-tax-matters (IRS)

This is one reason US and UK tax specialists for wealthy families should be involved before immigration. In 2026, transparency is structural. It is not a side issue. Planning must assume that financial institutions, account data, and cross-border asset information will be visible to tax authorities over time.

Pensions, deferred compensation, and family mobility

Wealthy families often focus first on trusts and companies, but pension rights and deferred compensation can be just as important. The IRS maintains dedicated guidance on retirement plans and international individual tax matters, while HMRC provides pension tax guidance for UK purposes. Those systems do not always align perfectly, especially where executive compensation or cross-border pension accruals are involved. http://www.irs.gov/retirement-plans http://www.gov.uk/tax-on-your-private-pension (IRS)

For founders, CFOs, and senior executives moving jurisdictions, this affects liquidity planning, bonus timing, vesting events, and eventual retirement extraction. A sophisticated pre-immigration review should test what can be accelerated, deferred, or ring-fenced before residence changes.

The business impact: families rarely migrate alone

Many wealthy families are tied to operating businesses, investment platforms, or family offices. A relocation can therefore affect dividend policy, management location, succession timing, and where strategic control is exercised. That makes the tax analysis a business issue as well as a personal one. 

Professional oversight and governance standards matter here. ICAEW provides practical tax guidance resources for practitioners, and the Financial Reporting Council continues to emphasize governance and reporting quality in the UK corporate environment. http://www.icaew.com/technical/tax/tax-faculty/taxguides http://www.frc.org.uk (ICAEW)

At the macro level, both the Bank of England and the Federal Reserve remain useful reference points for the broader financial environment in which mobile capital and internationally structured wealth operate. http://www.bankofengland.co.uk http://www.federalreserve.gov (GOV.UK)

The practical point is simple: the move of one family member can change the tax profile of an entire family enterprise. That is why planning needs to happen before residence begins and before documents are signed.

Why wealthy families need joined-up advice, not siloed advice

A private client lawyer may understand succession. A domestic accountant may understand one tax system. An investment adviser may understand portfolio construction. None of that guarantees effective pre-immigration planning.

Wealthy families need one joined-up review that addresses residence, source, trust exposure, gift timing, future remittances, family entities, pensions, reporting, and liquidity. That is why US and UK tax specialists for wealthy families remain the most effective choice for families crossing between these two systems. They can connect the moving parts before those parts create compliance stress.

US and UK Tax is well-positioned in this space because the work is not generic. It is cross-border, fact-sensitive, and strategic. Families do not need boilerplate. They need a plan that fits their timeline, their structure, and their long-term objectives.

Conclusion

Pre-immigration tax planning is not about chasing technical loopholes. It is about entering a new jurisdiction cleanly, intelligently, and with full awareness of what residence changes will do to income, gains, trusts, gifts, and family control structures.

In 2026, the UK’s residence-based foreign income and gains regime, the continuing US worldwide reporting model, and global information exchange rules mean wealthy families should plan earlier than ever. The families that act before the move usually preserve more flexibility, avoid more friction, and protect more capital. (GOV.UK)

If your family is considering a move, the right question is not whether planning is necessary. The right question is whether you are starting early enough.

If you want a clear, strategic review before residence begins, speak to advisers who understand how both systems interact in real life. Contact hello@jungletax.co.uk or call 0333 880 7974

FAQs

When should pre-immigration tax planning start?

You should start before contracts are signed, assets are sold, or family members begin spending meaningful time in the destination country. Residence can begin earlier than many families expect, so early analysis creates more options. (GOV.UK)

Does the UK still have the old non-dom remittance basis?

No. HMRC says the remittance basis was abolished from 6 April 2025 and replaced with a residence-based regime for foreign income and gains, including a four-year relief for eligible new arrivals. (GOV.UK)

Do foreign trusts need special review before moving to the United States?

Yes. The IRS states that transactions with foreign trusts and certain foreign gifts can trigger Form 3520 reporting, so trust structures should be reviewed before US tax residency starts. (IRS)

Can wealthy families still use overseas companies or family investment companies after moving?

Possibly, but only after a detailed review of residence, control, reporting, financing, and succession objectives. ICAEW materials make clear that family investment companies require careful planning rather than routine implementation. (ICAEW)

Why is pre-immigration planning more urgent now than before?

Global transparency is stronger, the UK rules changed in April 2025, and US worldwide reporting remains extensive. Waiting until after arrival often turns strategy work into correction work. (OECD)

Why work with cross-border specialists instead of a general accountant?

A general accountant may understand one domestic system well but miss the interaction between two systems. Cross-border specialists are better placed to coordinate residence, trusts, gifts, gains, reporting, and family governance within a single plan.