UK Dual Nationality 2026: Holding British and Another Citizenship

Last reviewed: 14 May 2026 | Chandraketu Tripathi, finance editor

The UK's position on dual nationality is permissive: a British citizen can hold British citizenship alongside one or more other citizenships without any UK objection. The British Nationality Act 1981 does not require a British citizen to renounce other nationalities, nor does it prohibit holding multiple. The constraint, where one exists, comes from the other country's nationality law. Some countries strictly forbid dual nationality and require their citizens to renounce other citizenships at majority or on naturalisation elsewhere. Others permit it openly. Others have specific provisions allowing dual nationality only with certain countries or only for certain categories of person. The practical implications for the dual-national British citizen include choices on which passport to travel on, the limits of UK consular protection in the country of the other nationality, and tax obligations that are governed separately from nationality. This page is the 2026 guide to UK dual nationality: the UK position, the principal categories of other countries' laws, and the practical considerations for the holder of dual or multiple citizenships.

What this means for UK visa applicants in 2026

The UK's permissive position on dual nationality has been the rule for many decades. A British citizen by birth in the UK, by naturalisation, by registration or by descent can hold any other nationality without UK consequence. A foreign national applying for British citizenship is not required to renounce their original nationality as a UK condition; the application proceeds on its merits and the existing nationality is unaffected from the UK perspective.

The implications cut across several scenarios in 2026 practice:

An ILR holder considering naturalisation: the UK does not require renunciation of the original nationality. The applicant naturalises and, from the UK's perspective, holds British citizenship alongside their original. Whether the original nationality is preserved depends on the other country's law.

A British citizen acquiring another nationality (by marriage, by descent, by naturalisation elsewhere): the UK does not require renunciation of British citizenship. The British citizenship continues unaffected from the UK's perspective. Whether the new nationality is granted alongside British citizenship depends on the other country's law.

A British citizen by descent in Scenario A from the previous article (mother UK-born British, child born abroad to Singaporean father): the child holds British citizenship by descent and Singaporean citizenship by descent through the father. Singapore generally requires its citizens to choose at majority; the British citizenship is the UK-side anchor that will remain regardless of the Singapore decision.

A dual national entering or leaving the UK: the British citizen uses the British passport for UK entry; for entry to other countries, the British citizen uses whichever passport gives the best access (often the British passport for visa-free or visa-on-arrival access to many countries).

The 2026 context: the UK position on dual nationality has remained stable. No legislative change has been proposed that would limit dual nationality from the UK side. The principal current questions arise from other countries' positions on dual nationality, which vary widely.

How it works: the 2026 process

From a UK procedural standpoint, dual nationality requires no separate application or notification. A British citizen who acquires another nationality is not required to notify the Home Office or HM Passport Office. The British citizenship continues unaffected. A British passport can be applied for or renewed at any time during the dual-national status with no implications from the other nationality.

The British naturalisation application form does not ask the applicant to renounce other nationalities and does not impose any UK-side condition on the original nationality. The application proceeds on the standard naturalisation tests (residence, absences, character, knowledge, intention) without any UK-side restriction on dual nationality.

The practical processes for dual nationals in 2026 include:

Applying for or renewing a British passport at HM Passport Office: standard application, evidence of British citizenship (certificate of naturalisation, registration, or UK birth certificate), no question about other nationalities. The fee is the standard passport application fee.

Travelling: the British citizen uses the British passport for UK entry and immigration purposes. For travel to other countries, the British citizen uses whichever passport gives access. Many countries (including the US, the Schengen area, Canada, Australia, Japan, Korea and others) offer visa-free or visa-on-arrival access to British passport holders for short trips. For travel to the country of the other nationality, the dual national typically uses the other-nationality passport to enter and exit that country.

Registering events: marriages, births of children, and deaths abroad can have nationality implications. UK consular registration of births abroad to British parents is available through the British Embassy or High Commission in some countries; the registration does not by itself confer British citizenship (the citizenship rules in the BNA 1981 apply), but the registration creates a contemporaneous record.

Renouncing British citizenship: where the other country's law requires renunciation of all other nationalities for naturalisation or for retention of the other nationality, the UK has a formal renunciation procedure under section 12 of the BNA 1981. The renunciation is on Form RN and produces a Declaration of Renunciation. The procedure is reversible in defined circumstances under section 13 if the person later becomes British again.

The other country's law: the binding constraint

The principal variable in any dual-nationality position is the other country's law. The UK's permissive position is uniform; the other country's position varies widely.

Countries that broadly permit dual nationality include: the United States, Canada, Australia, New Zealand, Ireland, France, Germany (with recent reforms in 2024 making dual nationality much more widely available), Italy, Switzerland, Sweden, South Africa, Israel, the Philippines and many others. A British citizen who naturalises in these countries (or vice versa) can typically hold both nationalities without restriction. The specific rules of each country should be checked at the time of any nationality decision.

Countries that restrict dual nationality include: Singapore (citizens are required to choose at majority), India (Indian citizenship is lost on naturalisation elsewhere, although the Overseas Citizenship of India scheme provides a substitute status for many former Indians), Japan (citizens are technically required to choose by age 22, although enforcement varies), China (dual nationality is not recognised in mainland Chinese law for citizens), Saudi Arabia (Saudi citizens generally cannot hold other nationalities), and several others.

Countries with specific or conditional rules include: Spain (dual nationality permitted with certain countries; renunciation required for others); Norway (recently moved toward permitting dual nationality after a long restrictive period); Iceland (specific provisions); the Netherlands (specific provisions for naturalisation, with some categories permitted to retain Dutch citizenship and others not).

The practical implication is that any dual-nationality decision should be made with current knowledge of both countries' laws. The UK side is permissive and uniform; the other country's side is the variable. Where the other country requires renunciation as a condition of its nationality, the decision is binary: hold the other nationality (and renounce British) or hold British (and lose the other on the other country's terms).

Specialist legal advice on the other country's law (typically from a lawyer in that country) is essential where the decision is consequential.

Travel, consular protection and the practical realities

The practical day-to-day implications of dual nationality include the question of which passport to use, the limits of UK consular protection in the country of the other nationality, and the separation between nationality and other obligations such as tax.

Travel: the general rule is to use the British passport for UK entry and exit (this is required by UK law for British citizens entering the UK; UK Border Force will direct dual nationals to use the British passport). For travel to other countries, the dual national uses whichever passport provides the best access. When travelling to the country of their other nationality, a dual national normally uses the other-nationality passport to enter and exit that country. Some countries require their citizens to use their national passport at entry and exit, and treat dual nationals as exclusively their citizens while in the country.

Consular protection: a British citizen abroad can typically request consular assistance from a British embassy or consulate. However, the UK's ability to provide consular protection to a British citizen in the country of their other nationality is limited under the Vienna Convention on Consular Relations: the country of the other nationality is entitled to treat the dual national as exclusively its citizen and may not recognise the UK's consular interest. Dual nationals in their other country of nationality may find UK consular assistance unavailable or restricted in some circumstances.

Tax and other obligations: nationality and tax are separate. UK tax obligations are determined by residence and domicile, not by nationality. A British citizen non-resident in the UK is generally not subject to UK income tax on non-UK income. A non-British citizen UK-resident is subject to UK tax under the standard rules. Dual nationals should consult specialist tax advisers where the position is non-trivial (the US is a notable exception, requiring tax filing by all US citizens regardless of residence, which can create complex obligations for US-UK dual nationals).

Military service: some countries impose military service obligations on their citizens; a British dual national in such a country may be subject to those obligations while present in or returning to the country.

Voting: a British citizen has the right to vote in UK parliamentary elections (with some long-residence-abroad exceptions). Voting in the other country is governed by that country's law and is independent of British citizenship.

Costs, timelines and what to expect

The cost picture for dual nationality from the UK side is the cost of British nationality acquisition (1,630 pounds for adult naturalisation; lower fees for child registration) plus the cost of any subsequent passport applications (around 88.50 pounds for an adult standard passport, lower for children). There is no additional UK-side fee for being a dual national; the status is recognised by default.

The cost from the other country's side varies. Some countries charge for the retention or recognition of dual nationality; others impose fees for naturalisation that include implicit renunciation requirements; some countries have administrative processes for declarations of dual nationality.

The cost of renouncing British citizenship under section 12 of the BNA 1981 is the fee for the declaration of renunciation, published in the visa fees schedule. The cost is modest. The procedure is reversible under section 13 in defined circumstances (typically where renunciation was required to acquire or retain another nationality and the person has subsequently lost the other nationality).

Adviser fees for dual nationality questions vary. UK-side advice on the British position is straightforward and typically a Level 1 OISC consultation. Other-country advice requires specialist input from a lawyer or adviser in that country. Where the dual-nationality decision is consequential (significant tax implications, military service obligations, citizenship choice required at majority), combined UK and other-country advice is warranted.

Processing time: there are no UK-side procedural delays for dual nationality recognition. British passport applications follow the standard HM Passport Office timetable (around 3 to 8 weeks for standard service). Renunciation under section 12 is processed by UKVI and typically takes a few months.

Worked example: A US-born British naturaliser holding dual US-UK citizenship

Consider Rachel, a US national born in Boston who has lived in the UK on a Skilled Worker visa for 5 years, secured ILR, and is now naturalising as a British citizen in 2026. She wants to retain her US citizenship after naturalisation.

The UK position: Rachel's naturalisation application is on Form AN and proceeds on the standard residence, character, knowledge and intention tests. No UK-side renunciation is required. After grant and the citizenship ceremony, Rachel holds British citizenship.

The US position: US nationality law permits dual citizenship. A US citizen who naturalises in another country does not automatically lose US citizenship unless they take specific renunciation steps (which Rachel will not take). Rachel retains her US citizenship alongside her new British citizenship.

The practical implications for Rachel as a dual US-UK national:

Travel: for UK entry and exit, she uses her British passport. For US entry and exit, she uses her US passport (US law requires US citizens to enter and exit the US on a US passport). For travel to most other countries, she chooses whichever passport gives the best access.

Consular protection: in the UK she has British nationality protections; in the US she has US protections. In a third country, she can request UK or US consular assistance depending on which embassy is more accessible, but the embassy of the other nationality may not recognise the dual position.

Tax: this is where dual US-UK nationality is most consequential. The US taxes US citizens on worldwide income regardless of residence; Rachel must continue to file US tax returns (typically using the IRS Foreign Earned Income Exclusion and the US-UK tax treaty to limit double taxation, but the filing obligation persists). The UK taxes her on UK income as a UK resident. Specialist US-UK tax advice is essential.

Voting: Rachel can vote in UK parliamentary elections as a British citizen. She can also vote in US federal elections through the absentee voting system as a US citizen abroad.

The lessons: dual nationality from the UK side is automatic and permissive. The complications arise from the other country's law (where applicable) and from cross-cutting obligations like US worldwide taxation. Where the dual position is consequential, advice from both countries' professionals is warranted.

Getting regulated help: OISC, IAA and SRA advisers

UK-side dual nationality questions are typically Level 1 OISC ground. The British position is permissive and uniform; the questions an applicant asks (can I naturalise without renouncing my original nationality; does naturalisation in another country affect my British citizenship; how do I renounce British citizenship if needed) can be answered straightforwardly under the BNA 1981 framework.

Level 2 OISC advice is justified where complications arise: a previous deception finding or character matter that affects naturalisation; a complex transitional-provision case; an intersection with citizenship by descent; a renunciation decision with significant implications.

Other-country nationality law is outside the scope of UK regulated advisers. A specialist lawyer or adviser in the other country is needed for questions on whether the other country permits dual nationality, what conditions apply, and what the consequences are.

Where the dual-nationality position has tax implications (particularly US-UK dual nationality, where the US worldwide taxation rule produces complex obligations), a US-UK tax specialist is essential.

Verify any adviser's current authorisation on the OISC register at oisc.gov.uk/register or the SRA register at sra.org.uk/consumers/register.

Common mistakes and how to avoid them

The first avoidable error is assuming all countries permit dual nationality. The UK does; many other countries do not. The fix is to check the other country's nationality law before any decision (acquiring British citizenship, acquiring another country's citizenship, returning to a country that may require renunciation).

The second is using the wrong passport at UK entry. UK law requires British citizens to enter and exit the UK on a British passport. Dual nationals attempting UK entry on a non-British passport can be refused entry or subjected to questioning. The fix is always to use the British passport for UK entry and exit.

The third is over-reliance on UK consular protection in the other country of nationality. The Vienna Convention on Consular Relations permits the other country to treat the dual national as exclusively its citizen and may decline to recognise the UK's consular interest. The fix is to understand the consular-protection limits before travelling.

The fourth is conflating nationality with tax. Tax obligations are determined by residence and domicile, not by nationality. Dual nationals should consult specialist tax advisers where the position is non-trivial.

The fifth is treating the original nationality as automatically preserved on British naturalisation. The UK does not require renunciation, but the original country may treat naturalisation elsewhere as triggering loss of citizenship under its law. Check the other country's position.

The sixth is assuming renunciation of British citizenship is final. Section 13 of the BNA 1981 allows the resumption of British citizenship in defined circumstances where renunciation was made to acquire or retain another nationality and the other nationality has been lost. Specialist advice is required.

How Kaeltripton verified this article

The UK dual nationality framework described here is drawn from the British Nationality Act 1981 (in particular sections 12 and 13 on renunciation and resumption) as published on legislation.gov.uk, the published Home Office Nationality Instructions on gov.uk, and the GOV.UK pages on dual nationality. The reference to the Vienna Convention on Consular Relations is to the published convention text. The general descriptions of other countries' dual nationality positions are based on those countries' published nationality laws and the publicly available analyses by the Migration Observatory and other research bodies; specific positions are subject to current verification as countries' laws change. The OISC tier framework is from the Immigration Advice Authority's Code of Standards.

No section reference or rule on this page has been invented for the UK side. The other-country positions are described in general terms and applicants are referred to specialist advice in the relevant country for current detail.

Frequently asked questions

Sources

• legislation.gov.uk - British Nationality Act 1981, section 12 (renunciation)
• legislation.gov.uk - British Nationality Act 1981, section 13 (resumption)
• GOV.UK - Dual citizenship in the UK
• GOV.UK - Renounce British nationality
• GOV.UK - Nationality Instructions
• GOV.UK - UK visa and nationality fees
• Immigration Advice Authority - Immigration Advice Authority (formerly OISC)