Naturalisation as British Citizen - Requirements and Process

Becoming a British citizen through naturalisation is the final step in many people's immigration journey in the United Kingdom. It gives you the right to hold a British passport, to vote in all UK elections, and to live in the UK permanently without any immigration restrictions. However, the application is detailed, the Home Office fee is significant, and a single mistake, whether about your absences from the UK or the good character requirement, can lead to a refusal with no automatic refund.

This 2026 guide from the immigration team at MCR Solicitors in Manchester explains who qualifies for naturalisation, the residence and good character rules, the Life in the UK test and English language requirement, the fees and timescales involved, and the mistakes that most often cause applications to fail. It reflects the law and Home Office guidance as they stand under the British Nationality Act 1981. Because fees, thresholds and guidance change regularly, always confirm current figures on gov.uk before you apply, or speak to a solicitor.

What is naturalisation?

Naturalisation is the legal process by which an adult who was not born a British citizen can become one. It is governed by section 6 of the British Nationality Act 1981. Once your application is granted and you have attended a citizenship ceremony, you become a British citizen and can apply for a British passport.

Naturalisation applies to adults aged 18 or over. Children under 18 usually become British through a different process called registration, not naturalisation, and the rules for registering a child are separate. This guide focuses on naturalisation for adults.

Naturalisation is not the same as settlement

Naturalisation is not the same as getting indefinite leave to remain (ILR) or settled status under the EU Settlement Scheme. Settlement gives you the right to live in the UK without a time limit, but you remain a foreign national. Naturalisation goes a step further and makes you a British citizen. In almost all cases you must already hold settlement (ILR or settled status) before you can naturalise.

Who can apply for naturalisation?

There are two main routes to naturalisation, and the requirements differ slightly depending on which applies to you:

• The standard route (section 6(1)) for most applicants who hold settlement in their own right.
• The spouse or civil partner route (section 6(2)) for people who are married to, or in a civil partnership with, a British citizen.

In both cases you must be aged 18 or over, be of sound mind, and satisfy the good character, English language and Life in the UK requirements. The key differences are the length of residence required, the permitted number of absences, and whether you need to show an intention to continue living in the UK.

The residence requirement

The residence requirement is one of the areas where applications most commonly go wrong, so it is worth understanding in detail.

Standard route (section 6(1))

If you are applying in your own right and are not married to a British citizen, you must generally show that you:

• Have lawfully lived in the UK for at least 5 years before the date of your application.
• Were physically present in the UK exactly 5 years before the day the Home Office receives your application.
• Have held settlement (ILR or settled status) for at least the last 12 months before applying.
• Have not spent more than 450 days outside the UK during the 5-year period.
• Have not spent more than 90 days outside the UK in the final 12 months.
• Have not been in breach of the immigration laws at any point during the qualifying period.

Spouse or civil partner route (section 6(2))

If you are married to or in a civil partnership with a British citizen, the residence period is shorter. You must generally show that you:

• Have lawfully lived in the UK for at least 3 years before the date of your application.
• Were physically present in the UK exactly 3 years before the day the Home Office receives your application.
• Already hold settlement (ILR or settled status). On this route there is no separate requirement to have held it for 12 months first.
• Have not spent more than 270 days outside the UK during the 3-year period.
• Have not spent more than 90 days outside the UK in the final 12 months.

Absences and discretion

The absence limits above are the general rules. The Home Office does have discretion to overlook excess absences in some circumstances, for example where the excess is modest, where you have strong ties to the UK, or where the absences were caused by circumstances beyond your control. However, discretion is not guaranteed, and exceeding the limits significantly is a common reason for refusal. If your absences are close to or over the limit, it is worth taking legal advice before you apply, as the way you present the reasons can make a real difference.

The good character requirement

Every naturalisation applicant aged 10 or over must be of good character. The British Nationality Act does not define good character, but Home Office guidance sets out the factors caseworkers consider. These include:

• Criminality, including cautions, convictions and pending prosecutions, both in the UK and abroad.
• Immigration history, including any period of overstaying, illegal working, or breaching the conditions of your leave.
• Financial soundness, including bankruptcy, unpaid debts, and failure to pay tax or National Insurance. If you are self-employed, the Home Office may check that your tax affairs are in order.
• Deception or dishonesty in your dealings with the Home Office or other public authorities.
• Involvement in war crimes, terrorism, or other serious matters.

Good character is assessed for the whole of your life, not just the qualifying period, although more recent and more serious matters carry more weight. Even relatively minor issues, such as unpaid tax or a driving conviction, can affect an application, so it is important to disclose everything honestly. Failing to declare something the Home Office later discovers is treated very seriously and can lead to refusal or, in extreme cases, deprivation of citizenship.

Illegal entry and the good character rules

Home Office good character guidance has been tightened in recent years, and the treatment of people who entered the UK illegally or made dangerous journeys has changed. This is an area that has been subject to significant updates, and the current policy can affect applicants who arrived without permission even where a long time has passed. If any part of your immigration history involved unlawful entry, we strongly recommend taking specialist advice before applying, as this is one of the fastest-moving parts of the rules.

English language requirement

You must show that you can speak and understand English to at least CEFR level B1. You can usually meet this requirement in one of the following ways:

• By passing an approved English language test in speaking and listening at B1 level or above, from a provider on the Home Office approved list.
• By holding a degree that was taught or researched in English, supported by the appropriate confirmation.
• By being a national of a country the Home Office recognises as majority English-speaking.

Some applicants are exempt, for example those aged 65 or over, or those with a long-term physical or mental condition that prevents them from meeting the requirement. If you met the same English requirement when you were granted settlement, you generally do not need to prove it again for naturalisation, but you should check your particular circumstances.

The Life in the UK test

Unless you are exempt, you must pass the Life in the UK test before you apply. The test is a computer-based, multiple-choice exam based on the official handbook, Life in the United Kingdom: A Guide for New Residents. It covers British history, traditions, values and everyday life.

You book the test online, sit it at an approved test centre, and receive your result on the day. There is a fee to sit the test, and you can retake it if you do not pass. Keep your pass notification letter safe, as you will need to refer to it in your naturalisation application. The same exemptions that apply to the English language requirement (age 65 or over, or a qualifying long-term condition) generally apply to the Life in the UK test.

Intention to live in the UK

On the standard route (section 6(1)), you must intend to continue living in the UK, or to continue in Crown service or certain other qualifying employment. On the spouse route (section 6(2)), there is no separate requirement to show an intention to remain, because that route is based on your relationship to a British citizen. Even so, all applicants should be prepared to demonstrate genuine ties to the UK.

Fees and how to apply

You apply for naturalisation online through gov.uk, complete the biometric enrolment step (providing your fingerprints and photograph), and upload or post the supporting documents. Two referees must confirm your identity and support your application; specific rules apply to who can act as a referee, including one professional referee.

The Home Office charges a substantial application fee for naturalisation, which includes the cost of the citizenship ceremony. Fees are reviewed regularly and tend to rise, so you should always check the current amount on gov.uk before you apply. Unlike some immigration applications, the naturalisation fee is largely non-refundable if your application is refused, which is one reason it is so important to get the application right first time.

How long does naturalisation take?

Processing times vary, but the Home Office aims to decide most naturalisation applications within around 6 months. Some cases are decided more quickly, while complex cases, for example those involving absences, criminality or unusual immigration histories, can take longer. Check gov.uk for the current published timescale.

The citizenship ceremony

If your application is approved, you will be invited to attend a citizenship ceremony, usually arranged by your local council. You normally have three months from the date of your invitation to attend. At the ceremony you make an oath or affirmation of allegiance and a pledge of loyalty to the UK, and you receive your certificate of naturalisation. You only become a British citizen once you have attended the ceremony, so this final step matters. After that, you can apply for a British passport.

Dual nationality

The UK permits dual (or multiple) nationality, so becoming British does not, from the UK's point of view, require you to give up your existing citizenship. However, some other countries do not allow their nationals to hold another citizenship, and may treat you as having renounced your original nationality. Before you naturalise, check the rules of your country of origin so you understand the consequences for your existing passport and status there.

Common reasons naturalisation applications are refused

• Exceeding the permitted number of days absent from the UK during the qualifying period.
• Applying too early, before completing the required residence period or the 12-month settlement period on the standard route.
• Failing the good character test because of criminal matters, unpaid tax, or immigration breaches.
• Not disclosing relevant information, which the Home Office may treat as deception.
• Errors or gaps in the application form or supporting documents, such as missing evidence of settlement or an invalid referee.

Many of these problems are avoidable with careful preparation. Because the fee is largely non-refundable, spending time (or getting professional help) to make sure your application is complete and accurate is almost always worthwhile.

How MCR Solicitors can help

At MCR Solicitors, our Manchester-based immigration team helps clients across the UK apply for naturalisation with confidence. We can review your residence history and absences, assess any good character concerns before they become a problem, check that your documents and referees meet the requirements, and prepare a clear, accurate application designed to avoid refusal. If your circumstances are complex, for example if you have absences over the limit, past immigration issues, or a criminal record, we can advise you on the best way forward.

To discuss your naturalisation application with an experienced immigration solicitor, call MCR Solicitors today on 0161 466 1280 for a confidential, no-obligation initial conversation.

Frequently asked questions

How long do I need to live in the UK before I can naturalise?

On the standard route you generally need at least 5 years of lawful residence, plus 12 months holding settlement (ILR or settled status). If you are married to or in a civil partnership with a British citizen, the residence period is generally 3 years and you must already hold settlement, with no separate 12-month wait. Always confirm your exact position, as absences and immigration history can affect eligibility.

Do I need indefinite leave to remain before I can apply?

In almost all cases, yes. You normally need to hold settlement, either indefinite leave to remain or settled status under the EU Settlement Scheme, before you can naturalise. On the standard route you usually also need to have held that settlement for at least 12 months before you apply.

Can I still naturalise if I have a criminal record?

It depends on the nature, seriousness and timing of the matter. All applicants must meet the good character requirement, and the Home Office considers cautions, convictions and other conduct across your whole life. Some matters lead to refusal, while others may not, depending on the circumstances. If you have any criminal history, take legal advice before applying so you understand your prospects and can present your case properly.

What happens if I have been outside the UK too much?

Exceeding the absence limits (450 days over 5 years, or 90 days in the final year on the standard route) is a common reason for refusal. The Home Office has some discretion to overlook excess absences in certain situations, but this is not guaranteed. If your absences are close to or over the limit, speak to a solicitor before applying, as the reasons for your absences and how they are explained can be decisive.

How much does naturalisation cost and is the fee refundable?

The Home Office charges a substantial fee for naturalisation, which includes the citizenship ceremony, and it is reviewed regularly. Check gov.uk for the current amount before you apply. Importantly, the fee is largely non-refundable if your application is refused, which is why accuracy and preparation matter so much.

Will I have to give up my current nationality?

The UK allows dual nationality, so from the UK's perspective you do not need to give up your existing citizenship. However, some other countries do not permit dual nationality and may treat you as having lost your original citizenship. Check the rules of your country of origin before you naturalise.

Ready to take the final step to British citizenship? Call MCR Solicitors in Manchester on 0161 466 1280 to speak with a specialist immigration solicitor about your naturalisation application.