You can usually apply for British citizenship 12 months after getting ILR, provided you have lived in the UK for at least 5 years, passed the Life in the UK test, proved your English at B1 level and meet the good character requirement. Spouses of British citizens need only 3 years of residence and ILR on the date of application. This guide covers the timeline for each visa route, the Home Office fees for 2026, how the application works and the most common reasons for refusal.
What naturalisation is and how citizenship differs from ILR
Naturalisation is the process by which an adult foreign national who has lived lawfully in the UK for the required period becomes a British citizen. The rules are set out in the British Nationality Act 1981, and every application is decided by the Home Office. Citizenship gives you the right to a British passport, to vote in parliamentary elections and to live, work and study in the UK free of any immigration restrictions.
Many people put off naturalisation because ILR (Indefinite Leave to Remain) feels almost equivalent. In practice, the difference is significant. ILR is an immigration status: it can lapse after a long absence (the general rule is more than 2 continuous years outside the UK) and it does not give you a British passport. Citizenship does not need to be renewed or confirmed, is not lost by moving abroad and can be passed on to children born overseas. More about the status itself is on the Imperial & Legal page about Indefinite Leave to Remain in the UK.
Naturalisation remains a discretionary decision: even if you formally meet every requirement, the Home Office looks at the application as a whole, including your immigration history and conduct. That is why it helps to understand not only the criteria, but also what citizenship actually adds compared with ILR.
Benefits of British citizenship compared with ILR status
- A British passport with visa-free access to many countries worldwide
- A status that is kept regardless of how long you live abroad
- The right to vote in UK parliamentary elections
- Citizenship that can pass to children born outside the UK
- Independence from future changes to the Immigration Rules
- Access to public sector roles that require British nationality
- Consular protection from the UK government when travelling abroad
These benefits come only at the end of the whole journey: a visa, then ILR, then naturalisation. The question asked most often is how long each of these stages takes.
When you can apply for citizenship: timeline by visa route
The general rule is that you must have lived in the UK for at least 5 years and held ILR (or settled status under the EU Settlement Scheme) for at least 12 months on the date of application. You must also have been physically in the UK exactly 5 years before the Home Office receives your application. Spouses and civil partners of British citizens need only 3 years of residence and do not have to wait 12 months after ILR, as set out in the GOV.UK guidance for spouses of British citizens.
| Route | Usual time to ILR | Earliest citizenship application |
|---|---|---|
| Skilled Worker | 5 years | around 6 years after arrival |
| Scale-up | 5 years | around 6 years |
| Global Talent | 3 or 5 years, depending on the category | after 5 years of residence and 12 months with ILR |
| Innovator Founder | 3 years | after 5 years of residence |
| Family visa (spouse of a British citizen) | 5 years | immediately after ILR |
| Long Residence | 10 years | around 11 years |
| EU Settlement Scheme | settled status after 5 years | 12 months after settled status (spouses of British citizens: immediately) |
The timings above reflect the rules in force at the time of publication. Holders of closed routes such as Tier 1 Entrepreneur or Tier 1 Investor follow the same principle: 5 years of residence and 12 months with ILR. Absence limits matter just as much: no more than 450 days outside the UK over the 5-year period and no more than 90 days in the last 12 months; for spouses, no more than 270 days over 3 years and the same 90 days in the final year. Home Office guidance normally allows small excesses (up to 30 days) to be disregarded, but larger ones need a strong explanation.
The earned settlement reform and what it could change
In 2025–2026 the government proposed an earned settlement reform: the baseline qualifying period for ILR could rise from 5 to 10 years, with reductions for “contribution” such as income, tax paid or occupation. In its report of 13 March 2026, the House of Commons Home Affairs Committee noted that ILR remains a prerequisite for citizenship, so any change to ILR timelines will also shift the route to naturalisation. At the time of publication, the final rules and transitional arrangements had not been confirmed.
To find out whether you are ready to apply now, it is worth going through each requirement separately, from residence to good character.
Requirements for naturalisation as a British citizen
The requirements for naturalisation are set by law and explained in detail in the Form AN guidance. You must be at least 18 years old and, on the date of application, free from any immigration time restrictions, which is exactly what ILR confirms.
Residence and immigration status
- At least 5 years of lawful residence (3 years for spouses of British citizens)
- ILR or settled status held for at least 12 months (for spouses, on the date of application)
- Absences within the limits: 450 / 90 days, or 270 / 90 days for spouses
- No breaches of the Immigration Rules during the qualifying period
- An intention to make the UK your main home
English language and the Life in the UK test
Your English must be proved with a certificate at B1 level or higher from an approved provider, or with a degree taught or researched in English. The accepted options are listed on the GOV.UK page Prove your knowledge of English, and sending the wrong qualification is a direct reason for refusal. The Life in the UK test has 24 questions on British traditions and history, you have 45 minutes to answer them and it costs £50. You do not need to take it if you are 65 or over or have already passed it, for example when applying for ILR.
The good character requirement
The good character requirement covers criminal convictions, civil judgments, tax and financial matters and immigration breaches. Under the Home Office good character guidance, applications made after 10 February 2025 that involve illegal entry will normally be refused, regardless of when the illegal entry took place. You must disclose everything the form asks for: concealing information is itself treated as a sign of poor character.
Why work with Imperial & Legal on your UK naturalisation
- Eligibility review before you pay the Home Office application fee
- Accurate count of days abroad from stamps and travel over 5 years
- Choice of the right way to prove your knowledge of English
- Review of immigration and tax history for possible risk factors
- Preparation of the online form and a covering letter for your case
- Support from immigration advisers registered with the IAA
- Help after the decision: ceremony, passport and children’s papers
Once the requirements are checked, the next question is how much the application will cost, both for one applicant and for the whole family.
British citizenship fees in 2026
Home Office fees are reviewed every year. From 8 April 2026, the amounts in the official table of immigration and nationality fees apply. The naturalisation fee has gone up, while the fee for registering children has come down.
| Application | Home Office fee |
|---|---|
| Naturalisation as a British citizen (adult) | £1,709 + £130 ceremony = £1,839 |
| Registration of a child under 18 | £1,000 (+ £130 if the child turns 18 before the decision) |
| Registration of an adult as a British citizen | £1,540 |
| Naturalisation as a British overseas territories citizen (BOTC) | £1,140 |
| Citizenship ceremony | £130 |
| Life in the UK test | £50 |
| Nationality review of a refusal | £513 |
The fee is not refunded if the application is refused, so checking the requirements before applying saves money directly. On top of the Home Office fees, budget for an English test (if you do not have a suitable certificate), document translations and a British passport after the ceremony. For example, for one adult and two children the government fees alone come to £3,839.
The naturalisation process in five stages
The application is made online, and supporting documents are either uploaded or scanned when you give your biometrics at a UKVCAS service point. Below is the path from the first eligibility check to a British passport.
Consultation and naturalisation eligibility check
English evidence, Life in the UK test and referees
Preparing and submitting the naturalisation application
Biometrics, processing and the Home Office decision
Ceremony, certificate and your first British passport
A decision is usually made within 6 months, although some applications take longer, and some applicants can pay for a faster decision. You must book and attend a citizenship ceremony within 3 months of receiving your invitation, otherwise the approval may be withdrawn.
Documents needed for a citizenship application
The exact list depends on your route and history, but the core of the application is the same for most applicants. All the details in it must match your previous immigration applications: mismatched dates and addresses often trigger requests for further information.
- Your current passport and all passports used during the qualifying period
- Proof of ILR, settled status or an eVisa
- A B1 English certificate or proof of a degree taught in English
- Your Life in the UK test pass letter
- A marriage or civil partnership certificate, if applying as the spouse of a British citizen
- Evidence of residence and tax status: P60s, tax returns, HMRC letters
- Details of every trip outside the UK during the 5 (or 3) year period
Requirements for referees
The application must name two referees. One can be of any nationality but must be a “professional person”, such as a lawyer, doctor or civil servant. The other must hold a British passport and be either a professional person or over 25. Each must have known you for at least 3 years and cannot be your relative, a relative of the other referee, your solicitor or agent, or a Home Office employee. If questions remain about your taxes during your years in the UK, it is better to resolve them before applying; the Imperial & Legal guide to UK tax residency explains how this works.
Naturalisation support
End-to-end help with your British citizenship application
Eligibility check
Review of status, ILR dates and good character before paying
Absence calculation
Day-by-day count of trips over 5 years and the last 12 months
Application pack
Form, English evidence and a covering letter for the caseworker
Referees and biometrics
Checking referees and booking your UKVCAS biometrics slot
Even when the adult requirements are clear, families with children face a separate question: how and when to secure citizenship for the children.
Registering children as British citizens
Children do not naturalise; instead, they are registered. A child born in the UK is automatically a British citizen if, at the time of birth, at least one parent was a British citizen or held ILR. If not, the child can usually be registered later, for example once a parent obtains ILR or citizenship, or once the child has lived in the UK for the first 10 years of their life.
An application to register a child is made separately for each child and the fee is £1,000. If the child turns 18 before the decision, the £130 ceremony fee is added. Children under 18 whose families cannot afford the fee may be able to apply for a fee waiver. In practice, parents often apply for naturalisation and register their children at the same time so that the whole family gets passports in one cycle.
It is also worth considering the opposite situation: a child born abroad to a naturalised citizen will usually be British “by descent”. Such a citizen generally cannot pass citizenship on automatically to their own children if they are also born outside the UK, which is worth bearing in mind when planning moves abroad.
Other routes to British citizenship
Naturalisation after ILR is the most common route, but not the only one. Depending on the circumstances, citizenship can also be acquired or confirmed on other grounds.
- Birth in the UK to a parent who is a British citizen or holds ILR
- Descent: a parent who is a British citizen otherwise than by descent
- Registration of children and certain categories of adults
- Statelessness, subject to residence conditions
- The Windrush scheme for Commonwealth citizens who arrived before 1973
- Settled status under the EU Settlement Scheme for EU citizens and their families
The six types of British nationality
British law recognises six types of British nationality: British citizenship, British overseas territories citizen, British overseas citizen, British subject, British national (overseas) and British protected person. Only British citizenship automatically gives the right to live and work in the UK without restrictions. Holders of the other statuses can in some cases register as British citizens, and each case needs to be assessed individually.
Practical examples: what the route to citizenship looks like
To make the requirements easier to picture, below are some typical situations that applicants face. These are generalised scenarios, not specific client cases.
A professional on a work visa
An engineer came to the UK on a Skilled Worker visa and received ILR after 5 years. He can apply for citizenship 12 months after ILR. The main risk is absences: with frequent business travel, the limit of 90 days in the last year is easy to exceed, so the application date should be chosen based on actual trips, not the calendar.
The wife of a British citizen
The applicant lived in the UK for 5 years on a family visa and obtained ILR. Because she is married to a British citizen, she does not need to wait another 12 months and can apply straight away after checking the 270-day limit for the last 3 years.
An entrepreneur with ILR after 3 years
A company founder obtained ILR on the Innovator Founder route after 3 years. Despite the early ILR, he still needs at least 5 years of residence to naturalise, so he will be able to apply 2 years later.
Similar situations come up regularly in Imperial & Legal’s practice: the route to citizenship usually starts with a visa and ILR, and the difficulties arise where immigration, tax and family matters overlap.
Client stories on this topic
Helping EU Nationals Get a UK Passport
Brexit transition period ended on 31 December 2020, and on 01 January 2021, the UK officially left the EU. Thousands of Europeans living in the UK had been advised to apply for the EU Settlement...
Getting a UK Spouse Visa to Relocate to the UK After Marrying a British Citizen
Emily first met Amid while on holiday in Goa. She was visiting with a friend from the UK, where she is from, to celebrate her graduation with a...
Tax Returns for Client Who Applies for Indefinite Leave to Remain
Anna relocated to the United Kingdom from New Zealand. She had been happy there with her husband Frederik. He had had a successful automobile business....
Tax planning for married couple moving to England to settle (Indefinite Leave to Remain)
Tobias and Hannah moved to the UK from Austria. The couple received a pre-settled status, which is granted to EU citizens, permitting them to relocate...
One of these clients, who went from settled status to a British passport, explained why he decided to get professional help with his application.
When I came to the UK to get a degree, I decided to stay here. Even though I am from Spain, the UK is the country where I belong. However, after Brexit, obtaining temporary residence and permanent residence in the UK became difficult for the Europeans. I had already obtained settled status, but I was getting nervous that I would mess up my British citizenship application. That is why I decided to get in touch with professional immigration advisors.
For clients like these, naturalisation is the natural end of a journey that began with a visa. But at this final stage, mistakes are especially costly: the fee is not refunded and a refusal stays on your immigration record.
Common mistakes and reasons for refusal
Most refusals are not about a lack of entitlement to citizenship, but about how the application was prepared. The most common problems are:
- Exceeding the absence limit, especially 90 days in the last 12 months
- Applying before 12 months have passed since ILR was granted
- An English certificate from a provider the Home Office does not accept
- Undisclosed fines, convictions or debts, including those abroad
- Unsuitable referees or inconsistencies in their details
- Dates and addresses that do not match previous immigration applications
- Missing the deadline to book the ceremony after approval
What to do if your citizenship application is refused
There is no right of appeal to an immigration tribunal against a naturalisation refusal. If the decision is based on a Home Office error, you can ask for a nationality review (fee £513). If the problem lay in the application itself, it is usually better to make a new application once the reason for refusal has been addressed. In some cases, a decision can be challenged by judicial review. Strategies after a refusal are covered on the Imperial & Legal page about refusals and appeals.
After approval and the ceremony, one practical step remains: getting a British passport and deciding what to do about your previous nationality.
Dual nationality and your first British passport
The UK allows dual citizenship, so you do not have to give up your existing passport to naturalise. However, the rules of your current country of nationality may differ: some states automatically withdraw citizenship when another is acquired or require you to report a second passport. This is worth checking before you apply. The options are covered in more detail on the Imperial & Legal page about dual citizenship.
The certificate of naturalisation is presented at the ceremony, and it is this certificate that allows you to apply for your first British passport. Plan any travel before the passport arrives carefully: after naturalisation your ILR no longer serves its purpose, but you do not yet hold a British passport. Many applicants apply for the passport and register their children straight after the ceremony to complete the family’s documents in a single cycle.
How to plan your route to a British passport
Naturalisation is the final stage of the immigration journey, and its success depends largely on decisions made years earlier: the trips you took, how your taxes were handled and what details you gave in visa applications. If you already hold ILR, it makes sense to set an application date in advance, take the tests and choose your referees. If ILR is still ahead of you, keep the citizenship requirements in mind now and follow the earned settlement reform.
Key takeaways
- Standard route: 5 years of residence and 12 months with ILR; spouses of British citizens need 3 years and ILR
- Absence limits: 450 days over 5 years (270 over 3 years) and 90 days in the last year
- From 8 April 2026, the fee is £1,709 plus £130 for the ceremony
- You need B1 English, the Life in the UK test and two referees
- Illegal entry normally leads to refusal under the rules introduced in February 2025
- Dual citizenship is allowed in the UK, but check the rules of your other country
The information on this page is general in nature and is not individual legal advice: any decision to apply should take account of your specific immigration history.
