Dual Citizenship and Tax: Separating Fact from Myth

The relationship between citizenship and taxation is widely misunderstood — and the misunderstanding is commercially convenient for some of those who sell citizenship planning services. This guide examines what dual citizenship actually means for your tax position, where it genuinely helps, where it does not, and the dangerous misconceptions that can lead to expensive errors.

The Fundamental Distinction: Citizenship vs Tax Residency

Citizenship and tax residency are entirely separate concepts determined by entirely separate rules.

Citizenship is a legal relationship between an individual and a state, typically established by birth, descent, naturalisation, or (in the case of CBI programmes) qualifying investment. It determines which passports you hold, where you have the right of abode, and what consular protection you can access. It does not, of itself, determine where you pay tax.

Tax residency is the determination — made by each country according to its own rules — of whether an individual owes tax in that country. For most countries, tax residency is determined by physical presence: how many days you spend there, where your home is, where your family lives, where your business interests are centred. Tax residency has nothing to do with which passport you hold.

This distinction is the starting point for everything that follows.

UK Tax and Citizenship: The Statutory Residence Test

The UK determines an individual's tax status through the Statutory Residence Test (SRT), introduced by the Finance Act 2013. The SRT applies a series of tests based on days spent in the UK, work patterns, and "ties" (accommodation, family, work, 90-day, and country ties). Under the SRT:

• A UK citizen living in London, working in London, with their family in London: UK resident, taxable on worldwide income and gains.
• A Grenadian citizen living in London, working in London, with their family in London: also UK resident, also taxable on worldwide income and gains.
• A UK citizen living in Dubai for 10 months per year, working remotely, with no UK accommodation: likely non-UK resident under the SRT, not taxable on most foreign income.
• A Grenadian citizen living in Dubai for 10 months per year: same analysis.

The citizenship — UK or Grenadian — does not appear in the SRT. What matters is where you actually live and spend your time.

A British national who acquires a Caribbean passport whilst continuing to live and work in Britain changes nothing about their UK tax position. They have a new passport. They still owe UK income tax, capital gains tax, and inheritance tax on exactly the same basis as before.

The Misconception and Where It Comes From

The misconception that a second passport reduces UK tax is persistent and, unfortunately, commercially useful. Some citizenship-planning advisers (not all — reputable ones are clear about this) conflate the concept of moving to a low-tax jurisdiction with the act of acquiring citizenship there. They may correctly note that "UAE citizens pay no income tax" — which is literally true — whilst allowing the client to infer that acquiring Grenadian or Dominican citizenship achieves something similar. It does not.

The steps required to genuinely reduce UK income tax liability are:

1. Become genuinely non-UK resident under the SRT — typically by spending fewer than 46 days per year in the UK (for those with significant UK ties) and establishing a genuine home and life elsewhere.
2. Establish genuine tax residency in another country — not merely having a residency card or a property there, but having a documentable, credible centre of life.
3. Ensure the other country either has a territorial tax system (taxing only income arising there) or does not tax the types of income you earn.

A second citizenship from a well-chosen jurisdiction supports step 2 — because it gives you the right to live in that country without a visa — but it is step 2 itself (actually moving and building a genuine life) that delivers the tax outcome. The passport is an enabler, not a substitute.

Where Dual Citizenship Genuinely Helps: Non-Tax Benefits

Dual citizenship does provide genuine practical benefits — they are just not primarily tax benefits:

EU freedom of movement. A British national who acquires Maltese or Portuguese citizenship gains full EU citizenship rights — the right to live, work, and establish businesses in any of the 27 EU member states without a visa or work permit. This is a real and significant practical benefit that has taken on extra salience since Brexit. For a British entrepreneur with EU clients, staff, or business interests, EU citizenship eliminates regulatory friction that their British-passport-only counterparts face.

US E-2 treaty access. Grenadian citizenship gives access to the E-2 investor visa treaty with the United States — allowing Grenadian nationals to apply for an E-2 visa and work and live in the US if they invest in a qualifying US business. This is not available to British nationals (the UK does not have an E-2 treaty with the US). For investors with genuine US business ambitions, Grenadian citizenship opens a pathway that would otherwise require a different and more onerous US immigration route.

UK visa-free access for non-British family members. If a non-British spouse or child acquires a Caribbean citizenship (which includes UK visa-free access as a Commonwealth member for some, and Schengen access across all), this can materially improve their travel freedom — even if it delivers no tax benefit.

Travel convenience and optionality. A second strong passport reduces queueing at immigration, eliminates the uncertainty of visa applications for non-priority travel destinations, and provides a genuine backstop if one country's passport becomes less useful due to geopolitical events (as the Russian passport's utility collapsed after 2022).

The US Exception: The Only Truly Citizenship-Based Tax System

The United States is unique among major economies in taxing its citizens on worldwide income regardless of where they live. A US citizen living in Sydney, Singapore, or Dubai owes US federal income tax on their global income — subject to the Foreign Earned Income Exclusion (which shelters the first USD 132,900 of earned income for the 2026 tax year for qualifying individuals), the foreign tax credit (which provides a credit for taxes paid to the country of residence), and the Foreign Account Tax Compliance Act (FATCA) reporting obligations.

This creates a specific situation for Americans considering CBI programmes: acquiring a second citizenship does not escape US tax. The only way for a US citizen to exit the US tax system permanently is renunciation of US citizenship — a serious, irreversible legal act. Before renouncing, the US requires payment of an exit tax on the deemed sale of all worldwide assets above a threshold, plus compliance with all outstanding US tax obligations. The decision to renounce should be made with specialist US tax counsel.

For Americans who have been living abroad for many years and whose non-US income substantially exceeds the FEIE exclusion, the accumulated cost of US tax compliance — even where taxes actually owed are reduced by the foreign tax credit — can make renunciation a rational financial decision. But this is a very specific situation for a specific population, not a general recommendation.

UK Residence and Inheritance Tax: A Separate Issue

UK income tax is determined by residence. UK inheritance tax (IHT) is also now determined by residence: from 6 April 2025 the UK replaced the old domicile-based IHT system with a residence-based test. Under the new rules, an individual is a "long-term UK resident" — and therefore within the scope of UK IHT on their worldwide estate — once they have been UK resident for at least 10 of the previous 20 tax years.

A long-term UK resident owes UK IHT on their worldwide assets regardless of where they are resident when they die, and a "tail" applies for several years after departure before worldwide exposure falls away. A long-term-resident Maltese citizen living in Dubai may still owe UK IHT on their worldwide estate (currently at 40% above the nil-rate band) while within the tail period. The Maltese passport does not change the IHT position; nor does simply acquiring a second nationality.

Falling outside UK worldwide IHT now requires breaking long-term UK residence and remaining non-UK resident for long enough to shed long-term-resident status under the 10-of-20-years test — not merely acquiring a second passport. This is scrutinised by HMRC and requires sustained, documented non-residence. (The previous concepts of "domicile", "deemed domicile" and the "15 of 20 years" rule were abolished for these purposes from 6 April 2025; older guidance referring to them is out of date.)

The Planning Opportunity: Using Citizenship to Enable Tax Migration

Despite all of the above, dual citizenship is a useful tool within a broader tax planning strategy — not because the citizenship itself changes your tax position, but because it enables the residency change that does.

A business owner who wants to leave the UK before selling their business needs two things: a place to go (genuine residency somewhere else) and the legal right to live there long-term without immigration uncertainty. A Malta or Portuguese citizenship solves the second problem completely and for life — you have the right to live in Malta or Portugal (and anywhere in the EU) permanently, as a citizen, with no visa required. This makes the genuine residency change much easier to establish, sustain, and defend before HMRC than a residency-based arrangement dependent on maintaining a valid visa.

In this way, citizenship planning and tax migration are complementary — but the sequence matters. The citizenship gives you the right to be somewhere. The genuine residency in that place gives you the tax outcome. Both are required; neither alone is sufficient.

Compliance Caveats

Tax law is complex, rapidly changing, and highly jurisdiction-specific. The UK government significantly reformed the non-domicile regime with effect from April 2025, and further changes are possible. US tax rules for citizens abroad are complex and require specialist US tax advice. This guide is for information only and does not constitute tax advice. Always obtain professional advice from qualified tax advisers in all relevant jurisdictions before making decisions based on tax planning considerations.

How Global Investments can help

Global Investments works with clients who are at the intersection of citizenship planning and international tax structuring. We help you understand the genuine benefits — and the genuine limitations — of second citizenship, and we coordinate with specialist tax advisers in the UK, EU, and relevant international jurisdictions to ensure that your citizenship planning and tax migration strategy are properly integrated. Contact us for a confidential consultation.