Tax Exit Planning When Acquiring New Citizenship and Leaving the UK

For UK taxpayers who are acquiring second citizenship and planning to leave the UK, the interaction between UK tax law and investment migration is both highly consequential and frequently misunderstood. Acquiring a new passport does not change your UK tax obligations. Leaving the UK does — but only if the departure is structured correctly and the departure tests under the UK's Statutory Residence Test (SRT) are met.

Getting the exit planning wrong can mean paying far more tax than necessary, or — worse — discovering years after departure that UK tax authorities consider you never properly left.

This guide sets out the key UK tax concepts relevant to individuals leaving the UK in connection with second citizenship or investment migration planning.

UK tax law is complex, changes regularly, and the application to individual circumstances is highly fact-specific. Nothing in this guide constitutes tax advice. You must engage a qualified UK tax adviser before taking any action in relation to UK tax exit planning.

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The Statutory Residence Test: Establishing UK Non-Residence

UK personal tax residence is determined by the Statutory Residence Test (SRT), which has applied since April 2013. The SRT replaces earlier more discretionary approaches with a structured framework of automatic tests and a sufficient ties test.

Automatic Overseas Test: You will be automatically non-UK resident in a tax year if you meet one of several automatic overseas conditions, including:

• Spending fewer than 16 days in the UK in the tax year (if you were resident in any of the three preceding tax years)
• Spending fewer than 46 days in the UK (if you were not resident in any of the three preceding tax years)
• Working full-time overseas (at least 35 hours per week on average, with no more than 30 UK workdays and no more than 90 UK days overall) for the whole tax year

Automatic UK Residence Tests: Conversely, you will be automatically UK resident if you spend 183 days or more in the UK in a tax year, have a UK home (and spend time there in the tax year), or conduct full-time work in the UK.

Sufficient Ties Test: For those who are not caught by either automatic test, UK residence is determined by the number of "ties" to the UK (family ties, accommodation ties, work ties, 90-day tie, country tie) combined with the number of days spent in the UK.

Practical implication for investment migration: Acquiring UAE, Bahraini, Caribbean, or other offshore residency does not cause you to leave the UK for UK tax purposes. You must actually reduce UK presence below the relevant threshold and, typically, sever the UK ties that would bring you back into residence under the sufficient ties test.

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Split Year Treatment

Where an individual leaves the UK partway through a tax year, split year treatment may apply. This divides the tax year into:

• A UK resident period (from 6 April to the date of departure)
• An overseas period (from the date of departure to 5 April)

During the overseas period, the individual is treated as non-UK resident, meaning foreign income arising in that period may not be subject to UK income tax (subject to specific rules about the type of income).

Split year treatment applies automatically where the relevant conditions are met — it does not require an election. The conditions differ depending on whether the individual is leaving to work full-time abroad, leaving to live with a partner already abroad, or simply leaving the UK (the "case 4" split year).

For investment migration applicants who are establishing new residency abroad (rather than taking up overseas employment), Case 4 split year treatment typically applies where the conditions are met.

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Capital Gains Tax Before Departure: The Critical Timing Decision

UK capital gains tax (CGT) applies to gains on the disposal of chargeable assets. The current rate is 18% or 24% for residential property; 18% or 24% for other assets depending on the rate band from 2024/25 onwards (rates changed in the October 2024 Budget). Annual exempt amount has been progressively reduced.

For individuals who hold assets with significant unrealised gains — shares, investment funds, investment properties, private company shareholdings, cryptocurrency — there is a choice:

Realise gains before departure: Gains realised while UK tax resident are subject to UK CGT. If the individual's alternative jurisdiction has no CGT (UAE, Bahrain, Cayman, etc.), realising gains before departure results in CGT at UK rates. This is unavoidable on gains that cannot wait.

Realise gains after departure: Gains realised after the individual has become genuinely non-UK resident are generally not subject to UK CGT, subject to the temporary non-residence rules (see below). For large unrealised gains, this represents a potentially very significant saving.

Deemed disposal: UK CGT does not have a deemed disposal event on departure (unlike, for example, Australia or Canada). This means unrealised gains do not crystallise at the point of departure — the individual can choose when to dispose of assets after leaving.

Action point: Review all assets with unrealised gains before departure. Decide whether to accelerate disposals before leaving (if the gain is modest or the asset needs to be sold anyway) or to hold and dispose after establishing non-residence.

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The Five-Year Temporary Non-Residence Rule

The most important rule for asset disposal planning is the temporary non-residence rule. Under TCGA 1992, s.10A, where a UK resident becomes temporarily non-resident (fewer than five complete UK tax years of non-residence), gains on assets held before departure that are realised during the period of non-residence are charged to UK CGT on return to the UK.

What this means in practice: If you leave the UK, spend three years abroad, realise large investment gains, and then return to the UK, those gains will be brought back into charge to UK CGT in the year you return. Simply moving offshore for a few years to sell shares or cryptocurrency and then returning does not work.

To avoid the five-year trap: You must be non-UK resident for more than five complete UK tax years before returning. A "complete" tax year runs from 6 April to 5 April, and the (partial) tax years in which you depart and return do not count towards the total. The safest course is therefore to ensure at least six complete tax years of non-residence elapse before any return. For example, if you depart partway through 2025/26, you would want to remain non-resident through to at least the 2031/32 tax year before returning, so that six full tax years (2026/27 to 2031/32) of non-residence have passed; returning sooner risks the rule biting and gains realised while abroad being taxed in the year of return.

Former remittance-basis users and the post-2025 regime: The remittance basis and the domicile-based tax regime were abolished from 6 April 2025, so domicile is no longer the relevant test for income and gains. Individuals who previously claimed the remittance basis, and those now within the four-year Foreign Income and Gains (FIG) regime, should take advice on how the temporary non-residence rules apply to their specific asset profile under the current residence-based rules and the transitional provisions.

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Long-Term Residence and UK Inheritance Tax

UK inheritance tax (IHT) applies at 40% above the nil-rate band thresholds. From 6 April 2025, the scope of IHT moved from a domicile basis to a residence basis. The old concept of "deemed domicile" (under which an individual UK resident for at least 15 of the previous 20 tax years was treated as deemed domiciled) was abolished for IHT alongside the wider abolition of the non-dom regime.

Under the current rules, an individual is a "long-term UK resident" — and so within the scope of UK IHT on their worldwide estate — if they have been UK resident in at least 10 of the previous 20 tax years. Once that test is met, worldwide-estate exposure continues for a "tail" period after departure, scaling with the length of prior UK residence (up to ten years for those who were resident throughout the preceding twenty years). This is a significantly longer tail than the three-year deemed-domicile tail that applied under the pre-2025 rules.

Planning implication: Settlement of an offshore trust, gifting of assets, or other IHT mitigation strategies may be more effective if implemented before long-term resident status arises, or planned around the post-departure tail. The excluded property protection for offshore trusts now depends on the settlor's long-term resident status rather than their domicile. Specialist advice is needed.

Abolition of the non-dom regime: The remittance basis and the non-dom regime for income and capital gains were abolished from 6 April 2025 and replaced by a four-year Foreign Income and Gains (FIG) regime for new arrivers (those non-resident for the prior ten tax years). Individuals who previously claimed the remittance basis should take specific advice on the transitional provisions.

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Pension Planning Before UK Departure

UK registered pension schemes have favourable tax treatment, and the interaction of pensions with departure from the UK is complex.

Pension crystallisation before departure: Crystallising pension benefits (taking a pension commencement lump sum, designating funds to drawdown) before leaving the UK can be advantageous where the lump sum is tax-free in the UK but would be subject to tax in the new country of residence. Advice on this should be taken from a financial adviser familiar with both UK pension rules and the new jurisdiction's tax treatment of pension income.

Overseas transfer: It is possible to transfer UK pension benefits to qualifying recognised overseas pension schemes (QROPS) — certain overseas pension schemes that meet HMRC requirements. QROPS transfers have significant tax implications and the rules have been subject to change. An overseas transfer charge of 25% applies in certain circumstances.

Lifetime Allowance abolition: The UK Lifetime Allowance was abolished from April 2024. The Lump Sum Allowance (£268,275 tax-free) and Lump Sum and Death Benefit Allowance are now the relevant limits. Advice on how these interact with departure planning should be taken from a specialist.

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National Insurance and State Pension

UK National Insurance contributions paid during UK residence generate entitlement to the UK State Pension. Voluntary NI contributions can often be maintained from overseas to continue building State Pension entitlement. A full new State Pension requires 35 qualifying years (with a minimum of around 10 years for any entitlement).

Note an important recent change: from 6 April 2026 it is no longer possible to pay voluntary Class 2 contributions for periods spent abroad — only voluntary Class 3 contributions are available for 2026/27 onwards (a narrow exception applies to certain individuals covered by international social security agreements and volunteer development workers). Class 3 contributions cost £18.40 per week for 2026/27. Even at the Class 3 rate, voluntary contributions can represent good value for individuals some years short of a full record, but the cost is materially higher than the Class 2 rate that was previously available to expats. The position should be reviewed before departure.

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How Global Investments Can Help

Global Investments works alongside specialist UK tax advisers to help clients integrate investment migration planning with UK tax exit. We do not provide UK tax advice directly, but we coordinate across the full advisory team to ensure that property acquisitions, CBI applications, residency establishment, and asset realisations are timed and structured in a way that is coherent with the UK exit strategy.

The mistakes we see most often: clients who acquire a second passport without making any change to their UK tax position; clients who sell assets too early, triggering unnecessary UK CGT; and clients who return to the UK before the five-year window closes, triggering the temporary non-residence rules.

Contact Global Investments to arrange a coordinated review of your UK exit and investment migration planning.