Here's the question that trips up almost everyone: does becoming British mean surrendering your old passport? In most cases, no. The UK has permitted dual nationality since 1948, and gov.uk states plainly that "you do not need to apply for dual citizenship" (gov.uk, 2026). In the year ending December 2025, the Home Office granted British citizenship to 235,782 people, the second-highest figure since 2005 (Home Office, 2026). This guide explains the rules, who allows two passports, and one costly myth: that a second passport changes your UK tax. For the wider picture, see our 2026 citizenship by investment guide.
Key Takeaways
- The UK allows dual citizenship and never asks you to renounce another nationality (gov.uk, 2026).
- The Home Office made 235,782 citizenship grants in the year ending December 2025, with 166,482 via naturalisation.
- Any renunciation requirement comes from your other country, not from the UK.
- A second passport does not change UK tax. Residence and the Statutory Residence Test decide that.
- The exception is citizenship-based tax: US and Eritrean citizens keep filing wherever they live.
Does the UK allow dual citizenship?
Yes. The UK allows dual citizenship outright, and gov.uk confirms "you do not need to apply for dual citizenship" because you can hold British nationality alongside another (gov.uk, 2026). This has been the position since 1948, codified by the British Nationality Act 1981. In short, becoming British never forces you to give up the passport you already hold.
So where does the renunciation myth come from? From other countries, not from Britain. When you naturalise as British, the Home Office does not contact your home government or ask you to surrender anything. Whether you can keep your first nationality depends entirely on that country's own law. India, China and several others restrict or revoke it; the UK never does.
One practical limit is worth knowing. As a dual national, you can't get UK consular help in the other country where you also hold citizenship (gov.uk, 2026). If you're a British-Indian dual national in India, for example, British consular staff usually cannot intervene. That's the main day-to-day trade-off, and it rarely affects people who plan ahead.
Citation capsule: The UK allows dual (multiple) citizenship and does not require you to renounce another nationality to become British, a position held since 1948 and confirmed by gov.uk in 2026 (gov.uk, 2026). Any obligation to give up a prior passport comes from the other country's law, not from the United Kingdom.
How many people gain British citizenship, and by which route?
The Home Office granted British citizenship to 235,782 people in the year ending December 2025, of which 166,482 came through naturalisation and 69,300 through registration (Home Office, 2026). That total fell 13% year on year, yet remained the second-highest since 2005. Naturalisation does most of the heavy lifting.
Who actually becomes British? Non-EU nationals dominated, accounting for 182,778 grants against 53,004 for EU nationals (Home Office, 2026). India, Pakistan and Nigeria led the table, together making up around a quarter of all grants. Italy topped the EU list with 10,455. These patterns track long-standing migration and family ties to the UK.
The naturalisation figure has climbed sharply over five years. The 166,482 grants in 2025 sit roughly 75% above the 95,623 recorded five years earlier (Home Office, 2026). The recent 13% dip reflects processing and policy shifts, not falling demand. Plenty of long-term residents are still converting settled status into a passport.
Citation capsule: In the year ending December 2025 the UK Home Office made 235,782 grants of British citizenship, of which 166,482 were by naturalisation and 69,300 by registration; India, Pakistan and Nigeria were the top three nationalities (Home Office, 2026). Naturalisation has risen about 75% over five years.
What are the UK dual nationality rules and naturalisation requirements?
To naturalise as a British citizen on the standard route, you generally need five years' UK residence, then 12 months holding indefinite leave to remain or settled status before applying (gov.uk, 2026). You must also meet absence limits: no more than 450 days outside the UK over five years, and no more than 90 days in the final 12 months. None of this requires giving up your existing nationality.
Two tests sit at the heart of the process. You must prove English at CEFR level B1 in speaking and listening through an approved test, and pass the Life in the UK test (gov.uk, 2026). The Life in the UK test costs GBP 50, runs 45 minutes and asks 24 questions. Spouses of British citizens follow a three-year route and can skip the 12-month ILR wait.
Then there's the cost. The naturalisation fee is GBP 1,839, made up of a GBP 1,709 application charge plus a GBP 130 citizenship ceremony fee (gov.uk, 2026). The Home Office upgrades these fees most years, so confirm the current figure before you apply. Add the GBP 50 test fee and English-test costs on top of the headline number.
You'll also need to satisfy the "good character" requirement, which covers criminal records, immigration history and tax compliance. Importantly, the UK never asks for proof that you've surrendered another passport. If your home country bars dual nationality, the consequence falls on your status there, not on your British application. The two systems run on separate tracks.
Citation capsule: UK naturalisation generally requires five years' residence, 12 months holding settled status, a B1 English qualification, the Life in the UK test at GBP 50, and absence limits of 450 days over five years (gov.uk, 2026). The application fee is GBP 1,839, and the UK never requires renouncing another nationality.
Does a second passport change my UK tax?
No. A second passport does not change your UK tax, because the UK taxes residence, not nationality, under the Statutory Residence Test introduced in 2013 (gov.uk RDR3, 2026). Spend 183 days or more in the UK in a tax year and you're automatically resident, whatever passports you hold. Nationality and tax are different systems.
Let's kill the myth directly. "Get a second passport to cut my UK tax" is a category error. Buying citizenship in a low-tax country does nothing to your UK bill if you keep living in the UK. What moves your tax position is where you're resident, measured by days and ties, not the colour of your passport. Treat citizenship and tax planning as two separate projects.
The UK rewrote its rules in 2025, and this matters more than any passport. The non-dom regime ended on 6 April 2025, replaced by a residence-based four-year foreign income and gains regime for qualifying new arrivals (gov.uk, 2026). Again, that relief turns on residence history, not nationality. We unpack the detail in our UK non-dom status 2026 explainer.
If lower tax is the real goal, the lever is residence. Becoming non-UK resident, for example by relocating to a no-income-tax jurisdiction, can change your exposure, while passports cannot. Our guide to Dubai tax residency shows how the day-count and ties tests work in practice. A second citizenship may make that move easier, but it's the move, not the document, that shifts the tax.
One genuine exception exists: citizenship-based taxation. The United States and Eritrea tax their citizens on worldwide income wherever they live (gov.uk technical note, 2026). So a US citizen who picks up a second passport still files US returns. For everyone else, residence rules the day, and a new passport leaves your tax home unchanged.
Citation capsule: A second passport does not change UK tax liability, which is set by residence under the Statutory Residence Test and, from 6 April 2025, the four-year foreign income and gains regime, not by nationality (gov.uk RDR3, 2026). The sole exception is citizenship-based taxation, applied only by the United States and Eritrea.
Which countries allow or restrict dual citizenship with the UK?
Whether you keep your first nationality depends on your other country, since the UK places no restriction (gov.uk, 2026). Many countries accept dual citizenship freely, while others restrict or revoke it. Gov.uk's own advice is blunt: "many countries do not accept dual citizenship, check with that country's consulate." The list below is illustrative, not exhaustive.
Some major countries restrict or bar dual nationality. India does not allow it, offering Overseas Citizen of India (OCI) status instead, which grants residence and entry rights but isn't full citizenship. China, Saudi Arabia, Japan, Singapore and Austria also restrict or auto-revoke citizenship on naturalising elsewhere, with limited exceptions. Always confirm with the relevant consulate, because rules change and carve-outs exist.
Plenty of countries sit comfortably with dual UK nationality. Ireland, the United States, Canada, Australia and most of the EU allow it, which is why so many British-Irish and British-American dual nationals exist. For investors weighing a second passport purely for mobility, our sibling guide to the most powerful passports of 2026 ranks visa-free reach in detail. Mobility, not tax, is the honest reason most people add a passport.
Citation capsule: The UK imposes no restriction on dual citizenship, but some countries do: India offers Overseas Citizen of India status rather than dual nationality, while China, Saudi Arabia, Japan, Singapore and Austria restrict or revoke citizenship on naturalising abroad (gov.uk, 2026). Always confirm current rules with the relevant consulate.
Frequently asked questions
Does the UK allow dual citizenship?
Yes. The UK allows dual (and multiple) citizenship, and gov.uk confirms you don't need to apply for it, since you can hold British nationality alongside another (gov.uk, 2026). Britain has permitted this since 1948. Becoming British never requires you to renounce a passport you already hold.
Does a second passport change my UK tax?
No. The UK taxes residence, not nationality, under the Statutory Residence Test from 2013 and the residence-based regime introduced on 6 April 2025 (gov.uk RDR3, 2026). A new passport leaves your UK tax unchanged. Only the US and Eritrea tax by citizenship.
Do I have to give up my old nationality to become British?
No, not as far as the UK is concerned. The Home Office never asks you to renounce another nationality to naturalise as British (gov.uk, 2026). Any requirement to give up your first passport comes from that country's own law, so check with its consulate before you apply.
How much does British naturalisation cost in 2026?
The naturalisation fee is GBP 1,839, combining a GBP 1,709 application charge and a GBP 130 ceremony fee (gov.uk, 2026). Add the GBP 50 Life in the UK test and your English test costs. The Home Office uprates fees most years, so check the current figure before applying.
How long must I live in the UK before applying?
The standard route needs five years' residence plus 12 months holding settled status, with no more than 450 days abroad over five years and 90 in the final year (gov.uk, 2026). Spouses of British citizens follow a shorter three-year route and skip the 12-month settled-status wait.
The bottom line on UK dual citizenship
The UK makes dual citizenship straightforward: it allows it, never asks you to renounce another passport, and granted 235,782 people British citizenship in the year to December 2025. The catch sits with your other country, so check its consulate before you naturalise. Above all, keep nationality and tax separate. A second passport widens your travel and your options, but it does not cut your UK tax, which follows residence and the day-count rules instead. Plan the two as distinct projects and you'll avoid the most expensive mistake people make here. If you want a clear, honest read on how a second passport fits your wider mobility and residence plan, you can plan your second citizenship with Ancova and weigh the trade-offs properly.
Sources
- gov.uk, "Dual citizenship," retrieved 2026-06-13, https://www.gov.uk/dual-citizenship
- gov.uk, "Dual nationality (caseworker guidance)," retrieved 2026-06-13, https://www.gov.uk/government/publications/dual-citizens/dual-nationality
- Home Office, "Immigration system statistics, year ending December 2025: settlement and citizenship," retrieved 2026-06-13, https://www.gov.uk/government/statistics/immigration-system-statistics-year-ending-december-2025/how-many-indefinite-leave-to-remain-settlement-and-euss-settled-status-and-citizenship-grants-have-been-issued-in-the-uk
- gov.uk, "Become a British citizen (eligibility and residence)," retrieved 2026-06-13, https://www.gov.uk/british-citizenship
- gov.uk, "Apply for citizenship if you have indefinite leave to remain (fees)," retrieved 2026-06-13, https://www.gov.uk/apply-citizenship-indefinite-leave-to-remain
- gov.uk, "Life in the UK Test," retrieved 2026-06-13, https://www.gov.uk/life-in-the-uk-test
- gov.uk, "Prove your knowledge of English for citizenship and settling (B1)," retrieved 2026-06-13, https://www.gov.uk/english-language
- gov.uk, "RDR3: Statutory Residence Test (SRT) guidance," retrieved 2026-06-13, https://www.gov.uk/government/publications/rdr3-statutory-residence-test-srt/guidance-note-for-statutory-residence-test-srt-rdr3
- gov.uk, "Check if you can claim the 4-year foreign income and gains regime," retrieved 2026-06-13, https://www.gov.uk/guidance/check-if-you-can-claim-the-4-year-foreign-income-and-gains-regime
- gov.uk, "Technical note: changes to the taxation of non-UK domiciled individuals," retrieved 2026-06-13, https://www.gov.uk/government/publications/changes-to-the-taxation-of-non-uk-domiciled-individuals/technical-note-changes-to-the-taxation-of-non-uk-domiciled-individuals
Written by
Amine Derag
Director of Strategy, Ancova Associates
Amine Derag is Director of Strategy at Ancova Associates, the Dubai advisory firm for company formation, residency, citizenship by investment, and cross-border tax structuring. He advises founders and private clients relocating to the UAE on how a UAE structure interacts with their home-country tax and reporting obligations.
Connect on LinkedInThis article is general information for educational purposes only and is not legal, tax, financial, or immigration advice. Investment thresholds, processing times, and program terms change — speak with a qualified Ancova adviser before acting.
