How to Apply for British Citizenship — Complete Guide 2026
What you need to know
- •You can apply for British citizenship after holding Indefinite Leave to Remain (ILR) for at least 12 months.
- •The total cost is £1,344 for adults (£1,214 application fee plus £130 ceremony fee).
- •You must pass the Life in the UK test and meet the B1 English language requirement before applying.
- •Processing takes approximately 6 months in 2026. Plan ahead and apply early.
- •You must not have spent more than 450 days outside the UK in the 5 years before applying, and no more than 90 days in the final 12 months.
Becoming a British citizen is the final step in your UK immigration journey. It gives you the right to vote, hold a British passport, and live in the UK permanently without any immigration restrictions. This guide covers everything you need to know about applying for British citizenship through naturalisation in 2026, including eligibility, costs, required documents, the Life in the UK test, and what to expect at your citizenship ceremony.
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What Is British Citizenship by Naturalisation?
British citizenship by naturalisation is the legal process by which a foreign national becomes a British citizen. It is the most common route for people who have lived in the UK on a visa and then obtained Indefinite Leave to Remain (ILR).
Once you are a British citizen, you can:
- Hold a British passport and travel freely to many countries
- Vote in all UK elections
- Live and work in the UK permanently with no visa restrictions
- Pass citizenship to your children in many cases
- Access full consular support when abroad
Unlike ILR, British citizenship cannot be lost through absence from the UK. It is permanent. This is why many people choose to move from ILR to citizenship as soon as they are eligible.
The UK allows dual citizenship. You do not need to give up your existing nationality. However, check the rules in your home country, as some nations do not allow their citizens to hold a second nationality.
Eligibility Requirements for British Citizenship
The full requirements for naturalisation depend on whether you are married to a British citizen. Here are the two main routes.
Route 1: Married to a British Citizen
- You must have held ILR (or equivalent status) for at least 12 months
- You must have been living in the UK for at least 3 years before your application
- You must not have been absent from the UK for more than 270 days in those 3 years
- You must not have been absent for more than 90 days in the final 12 months
- You must be of good character
- You must meet the English language requirement at B1 level
- You must have passed the Life in the UK test
Route 2: Not Married to a British Citizen
- You must have held ILR for at least 12 months
- You must have been living in the UK for at least 5 years before your application
- You must not have been absent for more than 450 days in those 5 years
- You must not have been absent for more than 90 days in the final 12 months
- All other requirements (good character, English, Life in the UK test) are the same
The good character requirement means you should not have serious criminal convictions, immigration offences, or unpaid debts to the Home Office. Minor traffic offences or very old spent convictions are usually not a problem.
If you are unsure whether you meet the requirements, read our detailed requirements guide.
Costs and Fees in 2026
British citizenship is not cheap. Here is a full breakdown for 2026. For more detail, see our citizenship fees and cost breakdown guide.
- Naturalisation application fee: £1,214
- Citizenship ceremony fee: £80
- Life in the UK test: £50 per attempt
- English language test (if needed): £150–£200
The total is approximately £1,344–£1,910 depending on whether you need to take language and knowledge tests. Unlike visa applications, there is no Immigration Health Surcharge for citizenship.
The application fee is non-refundable, even if your application is refused. This is one reason it is important to make sure you meet all the requirements before applying.
Documents You Need
Preparing the right documents is essential. A missing document can delay your application by weeks. See our complete citizenship documents checklist for a printable list.
Core Documents
- Your current passport and any previous passports covering the qualifying residential period
- Your Biometric Residence Permit (BRP) or digital status
- Your Life in the UK test pass notification
- English language test certificate or proof of exemption
- Birth certificate (with certified translation if not in English)
Referees
You need two referees. One must be a professional person (such as a teacher, solicitor, or civil servant). The other can be anyone over 25 who holds a British passport or is a British citizen. Neither referee can be a relative, your solicitor or immigration adviser, or an employee of the Home Office.
Form AN
You apply using Form AN (Application for Naturalisation). This is a detailed form covering your personal history, residence, travel, employment, and character. Many applicants find this form complex. Our Form AN guide walks through each section.
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The Application Process: Step by Step
Here is exactly what happens when you apply for British citizenship.
- Check your eligibility. Make sure you have held ILR for 12 months, meet the residence requirement, have passed the Life in the UK test, and meet the English language requirement.
- Gather your documents. Collect all required evidence. Use our documents checklist to make sure you have everything.
- Complete Form AN. You can apply online through the GOV.UK website or submit a paper form. The online route is faster and recommended.
- Pay the fees. The £1,214 application fee and £130 ceremony fee are paid during the online application process.
- Attend a biometric appointment. You will be asked to provide your fingerprints and a photograph at a UK Visa and Citizenship Application Services (UKVCAS) centre.
- Wait for a decision. The current processing time is approximately 6 months. The Home Office may contact you for additional information.
- Attend your citizenship ceremony. If approved, you will receive an invitation to a citizenship ceremony at your local council. You make an oath and receive your certificate of naturalisation.
The Life in the UK Test
The Life in the UK test is a mandatory requirement for both ILR and citizenship. If you passed it for your ILR application, you do not need to take it again.
The test consists of 24 multiple-choice questions about British traditions, history, and values. You have 45 minutes and need to score at least 75% (18 correct answers). The test costs £50 per attempt and must be booked at an approved test centre.
Most people pass on their first attempt with proper preparation. Study the official handbook, "Life in the United Kingdom: A Guide for New Residents." It is the only source material the questions are drawn from.
You are exempt from the test if you are under 18 or over 65, or if you have a long-term physical or mental condition that prevents you from taking it.
Common Reasons for Refusal
Citizenship applications can be refused. Understanding the common refusal reasons helps you avoid mistakes.
- Excessive absences. Spending too many days outside the UK during the qualifying period is one of the most common issues. Track your travel carefully.
- Good character failures. Criminal convictions, tax evasion, immigration offences, or providing false information can all lead to refusal.
- Not holding ILR for 12 months. You cannot apply for citizenship immediately after getting ILR. You must wait at least 12 months.
- Incorrect form or missing documents. Errors on Form AN or missing evidence will cause delays or refusal.
- Application submitted too early. Your application date must fall within the qualifying period. Applying even one day too early can result in refusal.
If your application is refused, you will receive a letter explaining the reasons. In most cases, you can reapply once you have addressed the issue. There is no formal appeal process for citizenship refusals, but you can request a review.
After You Become a British Citizen
Once you attend your citizenship ceremony and receive your certificate of naturalisation, you are a British citizen. You can then:
- Apply for a British passport. You can apply immediately after your ceremony. A first adult passport costs £82.50 online and takes around 3 weeks.
- Register to vote. You can now vote in all UK elections, including general elections, local elections, and referendums.
- Travel on your British passport. A British passport gives you visa-free or visa-on-arrival access to over 180 countries.
- Sponsor family members. As a British citizen, you can sponsor a spouse, partner, children, or parents for UK visas.
Keep your certificate of naturalisation safe. It is an important legal document. You will need it when you apply for your British passport and may need it for other official purposes throughout your life.
This guide is general information, not immigration advice. Immigration rules change frequently. For advice on your specific situation, consult an OISC-registered adviser or immigration solicitor. Always check GOV.UK for the latest rules.
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