Whether the UK allows dual citizenship is a question thousands of people ask every year. Whether you are a foreign national who has settled in the UK, a British citizen living abroad, or someone who has inherited citizenship from a parent, understanding whether you can hold two passports is essential before you make any decision about nationality.
In this guide, we explain what dual citizenship means in the UK context, whether it is allowed, which countries permit it, and what you need to know before applying for British citizenship or a second nationality.
What is dual citizenship?
Dual citizenship, also called dual nationality, means holding the citizenship of two countries simultaneously. As a dual citizen, you hold two passports and have the legal rights and obligations of both countries, including the right to live and work in both.
In practical terms, dual citizenship allows you to:
- Hold a valid passport from each country
- Live and work freely in both countries without needing a visa
- Access the healthcare, education, and public services of both countries
- Vote in elections in both countries where permitted
- Pass citizenship to your children in some circumstances
However, dual citizenship also comes with responsibilities. You may be subject to tax obligations, military service requirements, or other legal duties in both countries. Therefore, understanding the implications of holding two nationalities is just as important as understanding whether you are eligible.
Does the UK allow dual citizenship?
Yes. The United Kingdom fully allows dual citizenship. There is no requirement for you to give up your existing nationality when you become a British citizen. In addition, British citizens who acquire the citizenship of another country do not automatically lose their British citizenship.
Therefore, if you are a foreign national living in the UK and you naturalise as a British citizen, you can keep your original passport provided your home country also permits dual citizenship.
This makes the UK one of the more straightforward countries in the world when it comes to dual nationality. You do not need to make a choice between your existing citizenship and British citizenship.
Can every country hold dual citizenship with the UK?
No. While the UK permits dual citizenship, not every country does. Whether you can hold dual citizenship with the UK depends entirely on the rules of your other country of nationality.
Some countries that generally permit dual citizenship with the UK include:
- Australia
- Canada
- Ireland
- France
- Germany broadly permits dual citizenship following major nationality law reforms introduced in 2024.
- Italy
- United States
- Pakistan
- Bangladesh
- Philippines
- South Africa (in many circumstances)
Some countries that generally do not permit dual citizenship include:
- India – Indian law requires you to give up Indian citizenship when you acquire another nationality. Indian nationals who become British citizens must surrender their Indian passport and apply for an Overseas Citizen of India (OCI) card instead.
- China – China does not officially recognise dual citizenship. Chinese nationals who acquire British citizenship are generally expected to renounce their Chinese nationality.
- Japan – Japan generally requires dual nationals to choose one nationality by age 22, although enforcement practices can vary.
- Singapore – Singapore does not permit dual citizenship for adults.
- Saudi Arabia – Saudi Arabia does not generally permit dual citizenship.
- United Arab Emirates – dual citizenship may be permitted in limited approved circumstances, but the rules remain restrictive.
This list is not exhaustive. Citizenship laws change and individual circumstances vary significantly. Therefore, always confirm the current rules of your specific country of nationality before applying for British citizenship or another passport.
What happens if you become British but your country does not allow dual citizenship?
If your home country does not permit dual citizenship and you become a British citizen, you may face a difficult choice. Your home country may:
- Automatically revoke your original citizenship when you acquire British citizenship
- Require you to formally renounce your original citizenship
- Simply not recognise your British citizenship while you remain on their territory
In practice, some countries that technically prohibit dual citizenship do not actively enforce the rule. However, relying on non-enforcement is risky. You could face legal consequences when you travel to your home country or when dealing with government authorities there.
Therefore, if your home country does not permit dual citizenship, seek legal advice from an immigration or nationality lawyer in both the UK and your home country before applying for British citizenship.
How to become a British citizen: the main routes
To hold dual citizenship with the UK, you first need to qualify for British citizenship. The main routes are:
Naturalisation
Naturalisation is the most common route for adults who have lived in the UK for a qualifying period. To apply for naturalisation, you must:
- Have lived lawfully in the UK for at least 5 years and have been physically present in the UK exactly 5 years before the application date
- Have held indefinite leave to remain (ILR) or settled status for at least 12 months before applying
- Not have spent more than 450 days outside the UK in the 5-year qualifying period
- Not have spent more than 90 days outside the UK in the final 12 months before applying
- Be of good character
- Pass the Life in the UK test
- Meet the English language requirement at B1 level or above
Spouses and civil partners of British citizens follow a slightly different qualifying period. Applicants married to British citizens may qualify under the 3-year residence route if they are married to or in a civil partnership with a British citizen on the date of application.
Registration
Registration is available to certain categories of people who have a close connection to the UK but do not qualify through naturalisation. Registration routes include:
- Children born abroad to a British parent who did not automatically inherit citizenship
- Children born in the UK who do not automatically qualify as British at birth
- Former British citizens who lost citizenship in specific circumstances
- British Overseas Territories citizens and other categories with historic connections to the UK
Registration requirements vary significantly depending on which category applies. Seek professional advice if you believe you may qualify through a registration route.
Citizenship by birth
Not everyone born in the UK is automatically a British citizen. The rules depend on the immigration status of your parents at the time of your birth:
- If you were born in the UK and at least one parent was a British citizen or settled in the UK at the time of your birth, you are automatically a British citizen
- If you were born in the UK but neither parent was British or settled at the time, you are not automatically a British citizen
In addition, children born abroad to a British citizen parent may be British by descent. However, the right to pass citizenship by descent has limits. Only one generation born abroad automatically acquires citizenship through a British parent in most cases.
The Life in the UK test for British citizenship
Most adult naturalisation applicants must pass the Life in the UK test as part of their citizenship application. The test covers British history, culture, government, and values.
The test consists of 24 multiple-choice questions and must be completed within 45 minutes. You must score at least 75%, which means answering at least 18 questions correctly.
You book the test through the official gov.uk portal. The test fee is Β£50. You can take the test at approved test centres across the UK. There is no limit on how many times you can sit the test, but you must pay the fee each time.
In addition, you must present your original passport and a second form of identity when attending the test. You receive your result immediately on the day.
English language requirement for British citizenship
You must demonstrate English language proficiency to naturalise as a British citizen. The required level is B1 on the Common European Framework of Reference, which is the same level required for most UK visa routes.
You can demonstrate English language by:
- Passing an approved Secure English Language Test (SELT)
- Holding a degree, diploma, or other academic qualification taught in English in a majority English-speaking country
- Being a national of a majority English-speaking country
In addition, if you have already demonstrated English language as part of a previous UK visa or extension application, you may not need to provide new evidence at the citizenship stage. However, always confirm the current requirements before applying.
Good character requirement for British citizenship
Every applicant for British citizenship must be of good character. The Home Office assesses your character based on your full history. Factors that can affect the good character assessment include:
- Criminal convictions – any unspent conviction in the UK or abroad can affect your application. Serious convictions can permanently bar you from naturalisation.
- Immigration breaches – overstaying, working without permission, or providing false information in previous applications
- Financial matters – significant unpaid debts, tax evasion, or bankruptcy in some circumstances
- Associations with extremism or serious organised crime
The Home Office does not publish a complete list of disqualifying factors. Each case is assessed individually. Therefore, if you have any concerns about your good character assessment, seek professional advice before applying.
British citizenship fees in 2026
| Application type | Fee |
|---|---|
| Naturalisation as a British citizen (adult) | Β£1,709 |
| Registration as a British citizen (child) | Β£1000 |
| Citizenship ceremony fee | Β£130 |
| Life in the UK test | Β£50 per sitting |
For a complete breakdown of all UK immigration and nationality fees, read our UK immigration fees 2026 guide.
What is the citizenship ceremony?
After the Home Office approves your naturalisation application, you must attend a citizenship ceremony before your British citizenship becomes effective. The ceremony is organised by your local council and must take place within 3 months of receiving your approval letter.
At the ceremony, you take the Oath of Allegiance and the Pledge of Loyalty to the United Kingdom. After the ceremony, you receive your certificate of naturalisation, which you use to apply for your British passport.
Citizenship ceremonies are a formal and meaningful occasion. Most councils allow family members to attend as guests.
How to apply for a British passport after naturalisation
Once you have your certificate of naturalisation, you can apply for a British passport. You apply through His Majesty’s Passport Office (HMPO). The standard passport fee in 2026 is Β£88.50 for an adult 34-page passport.
You will need to submit:
- Your certificate of naturalisation
- Your current foreign passport
- Passport photographs meeting HMPO specifications
- The completed application form
Processing times vary depending on demand and application complexity.
After receiving your British passport, you can continue to hold and renew your foreign passport alongside it, provided your other country of citizenship permits dual nationality.
Practical implications of holding two passports
Holding dual citizenship and two passports has several practical implications worth understanding:
Travelling between your two countries: You should use your British passport when entering and leaving the UK. You should use your other country’s passport when entering and leaving that country. Using the correct passport for each country avoids triggering any concerns about your departure from one country using a foreign travel document.
Tax obligations: Holding dual citizenship does not automatically create dual tax obligations. Tax residency is determined by where you live and work, not simply by which passports you hold. However, some countries, notably the United States, tax their citizens on worldwide income regardless of where they live. If your other country has such rules, seek professional tax advice.
Military service: Some countries require military service from their citizens. If you hold dual citizenship with a country that has mandatory military service, you may be subject to that obligation when present in that country, even if you are also a British citizen.
Consular protection: As a dual citizen, the UK may not be able to provide full consular assistance if you run into difficulty in your other country of citizenship. That country may regard you solely as its own citizen and deny UK consular access.
How LawSentis can help with dual citizenship UK and British naturalisation
LawSentis is regulated by the Immigration Advice Authority (IAA) at Level 3, which is the highest level of authorisation in the UK. We advise individuals on British citizenship applications, dual citizenship eligibility, and the implications of acquiring a second nationality.
Our team can:
- Confirm your eligibility for British citizenship by naturalisation or registration
- Advise on the good character requirement and any complications in your history
- Review your qualifying period and absence record before you apply
- Prepare and submit your naturalisation application with a complete supporting document pack
- Advise on the implications of dual citizenship with your specific country of nationality
- Guide you through the OCI card process for Indian nationals
- Plan your application in the context of your full immigration history
We also advise on the steps leading to citizenship. Read our guides on how long ILR takes in 2026 and EU settled status help for more information on the qualifying steps before citizenship.
Book a consultation with LawSentis today. We will assess your eligibility and guide you through every step of your British citizenship application.
Frequently asked questions
Does the UK allow dual citizenship?
Yes. The UK fully allows dual citizenship. You do not need to give up your existing nationality when you become a British citizen. In addition, British citizens who acquire another nationality do not automatically lose their British citizenship.
Can I keep my passport if I become a British citizen?
Yes, provided your home country also allows dual citizenship. The UK does not require you to surrender your existing passport when you naturalise. However, some countries, such as India, China, and Japan, require their citizens to renounce their original citizenship when they acquire another nationality.
What are the requirements to become a British citizen?
You must have lived in the UK for at least 5 years, hold ILR or settled status for at least 12 months, not exceed the permitted absence limits, pass the Life in the UK test, meet the English language requirement at B1 level, and be of good character.
How much does British citizenship cost in 2026?
The naturalisation fee is Β£1,709 for adults. The citizenship ceremony costs Β£130. The Life in the UK test costs Β£50 per sitting.
What is the Life in the UK test?
The Life in the UK test is a mandatory test for most adult naturalisation applicants. It covers British history, culture, government, and values. It consists of 24 multiple-choice questions. You must score at least 75% to pass.
Can children have dual citizenship in the UK?
Yes. Children can hold dual citizenship. A child who is automatically British by birth can also hold the citizenship of their other parent’s country, provided that country permits dual citizenship for children.
Do dual citizens pay tax in both countries?
Tax obligations depend on where you live and work, not simply on which passports you hold. Most countries tax based on residency. However, some countries, notably the United States, tax their citizens on worldwide income regardless of residence. Seek professional tax advice if this applies to your situation.
Can I use both passports for travel?
Yes. As a dual citizen, you should use your British passport when entering and leaving the UK and your other country’s passport when entering and leaving that country. This is the standard and recommended approach for dual citizens.
What if my country does not allow dual citizenship but I want British citizenship?
You will need to consider whether your home country will automatically revoke your original citizenship when you naturalise as British, or whether it requires you to formally renounce it. In some cases, countries that technically prohibit dual citizenship do not actively enforce the rule. However, relying on non-enforcement carries risk. Seek legal advice from both a UK adviser and a lawyer in your home country before proceeding.
Note:
This article is for general information only. Immigration rules change frequently. Always seek advice from an IAA-regulated immigration adviser before making any application.
LawSentis is regulated by the Immigration Advice Authority (IAA) at Level 3. Contact us for professional advice.