British citizenship can be acquired after birth in two main ways: naturalisation and registration. Naturalisation is for an adult who qualifies through residence. Registration is for a person with a specific connection to the UK set out in the law. Applying under the wrong provision can mean a refusal and a lost fee, or paying for a harder route than necessary. This post provides an overview of the difference between naturalisation and registration for a UK British citizenship application.
Key overviews
- Naturalisation is for adults who qualify through residence. It sits in section 6 of the British Nationality Act 1981 and requires indefinite leave to remain or equivalent status.
- Registration is for people with a particular connection set out in the Act. Common examples are children born in the UK and children of British parents born abroad.
- Some registration routes are an entitlement, while naturalisation is always discretionary. Where an entitlement applies, the Home Office must register a person who meets its terms, subject to good character.
- Naturalisation requires English and the Life in the UK Test. The registration provisions for children in sections 1 and 3 of the Act do not.
What is the difference between naturalisation and registration?
Naturalisation is for an adult who becomes British by living in the UK. Registration is for a person with a connection the law already recognises. Both lead to the same British citizenship.
Both routes come from the British Nationality Act 1981. Naturalisation sits in section 6 and Schedule 1. Registration is spread across many sections. Each is written for a particular group, such as children born in the UK or children of British parents born abroad.
The difference matters because each route has its own requirements, form and fee. A person does not choose between them freely. The route that applies depends on their age, place of birth, parents’ status and residence history. Our British citizenship guide sets out every way to become British.
Who can naturalise as a British citizen?
An adult can naturalise once they meet the residence, status and personal requirements in Schedule 1 to the Act. Section 6 applies to a “person of full age and capacity”, so naturalisation is not open to children.
There are two naturalisation provisions. Section 6(1) is the general route. Section 6(2) is for an applicant who is married to, or the civil partner of, a British citizen on the date of application.
Under paragraphs 1 and 2 of Schedule 1, an applicant under section 6(1) must meet each of the following requirements, where the applicant:
- was in the UK at the start of the 5-year period ending with the date of application;
- was absent from the UK for no more than 450 days in those 5 years;
- was absent for no more than 90 days in the final 12 months;
- was not subject to any time limit on their stay in the UK during the final 12 months;
- was not in the UK in breach of the immigration laws at any time in the 5 years;
- is of good character;
- has sufficient knowledge of English, Welsh or Scottish Gaelic;
- has sufficient knowledge about life in the UK; and
- intends their home, or principal home, to be in the UK.
The 12-month rule on time limits is why most applicants under section 6(1) wait 12 months after receiving indefinite leave to remain. Our guide to naturalisation as a British citizen covers each requirement and its evidence.
How does naturalisation differ for the spouse of a British citizen?
The spouse or civil partner of a British citizen applies under section 6(2), with a 3-year residence period instead of 5. The applicant does not need to wait 12 months after receiving indefinite leave to remain.
Under paragraph 3 of Schedule 1, the applicant must have been in the UK at the start of the 3-year period before applying. Absences must not exceed 270 days in those 3 years, or 90 days in the final 12 months. On the date of application, the applicant must not be subject to any time limit on their stay in the UK.
The good character, language and Life in the UK requirements apply in the same way. Paragraph 3 does not include the intention to live in the UK that applies under section 6(1). Our guide on whether you can apply for British citizenship straight after ILR explains the timing for spouses.
Whytecroft Ford’s immigration team can confirm whether an applicant qualifies under section 6(1) or 6(2). Call 0208 757 5751 or use the contact form.
Who can register as a British citizen?
Registration is for a person who falls within one of the registration provisions of the Act. Each provision is written for a particular situation, and most of them concern children.
Common registration provisions include:
- Section 1(3): a child born in the UK who was not British at birth, where a parent becomes British or settled while the child is under 18.
- Section 1(4): a person born in the UK who was not British at birth, and who was absent for no more than 90 days in each of their first 10 years.
- Section 3(1): any child under 18, at the Home Secretary’s discretion.
- Sections 3(2) and 3(5): a child born outside the UK to a parent who is a British citizen by descent, where residence conditions are met.
Further provisions cover other groups, including some British nationals with other forms of British nationality. Others address people affected by historical rules on passing citizenship through a mother or an unmarried father.
A section 1(4) application can be made “at any time after he has attained the age of ten years”. An adult born in the UK who meets the 10-year condition can therefore register rather than naturalise. Our guide to British citizenship by registration covers each provision.
Is citizenship an entitlement or at the Home Office’s discretion?
Naturalisation is always discretionary, and registration can be either. The wording of each provision decides which.
Section 6 states that the Secretary of State “may, if he thinks fit” grant a certificate of naturalisation. Meeting every requirement in Schedule 1 does not create a right to citizenship. Section 3(1), the general route for children, uses the same discretionary words.
Sections 1(3), 1(4), 3(2) and 3(5) work differently. Each states that the person “shall be entitled” to be registered when its conditions are met. The Home Office cannot refuse an entitlement application on discretionary grounds, although the good character requirement still applies to applicants aged 10 or over.
Whytecroft Ford’s immigration team can identify whether an entitlement provision applies before an application is made.
Does good character apply to registration?
Yes, for most registration applicants aged 10 or over. Under section 41A of the Act, an application under the listed provisions must not be granted unless the person “is of good character”.
The provisions listed in section 41A include sections 1(3), 1(4), 3(1), 3(2) and 3(5). Section 41A applies to an “adult or young person”, which it defines as a person aged 10 or over on the date of application. A child under 10 is not assessed for good character.
Naturalisation applicants are assessed for good character under paragraph 1(1)(b) of Schedule 1. The same Home Office good character guidance applies to both routes. Our guide to British citizenship refusal covers what happens when the requirement is not met.
Do you need English and the Life in the UK Test for registration?
Naturalisation requires both, while the registration provisions for children in sections 1 and 3 do not. Paragraph 1(1)(c) and (ca) of Schedule 1 set the language and Life in the UK requirements for naturalisation.
Sections 1(3), 1(4), 3(1), 3(2) and 3(5) contain no language or Life in the UK requirement. A person registering under section 1(4) as an adult therefore does not sit the Life in the UK Test.
For naturalisation, the evidence of English and the Life in the UK Test pass are submitted with Form AN. Exemptions apply for age and some medical conditions.
Naturalisation vs registration: forms, fees and ceremonies
The table below compares the two routes. The fees are from the Home Office fees table in force from 8 October 2026.
| Naturalisation | Registration | |
|---|---|---|
| Legal basis | Section 6 and Schedule 1 | Separate sections for each group, such as sections 1(3), 1(4) and 3 |
| Who applies | Adults only | Mostly children; some adults |
| Entitlement or discretion | Always discretionary | Depends on the provision |
| Residence period | 5 years, or 3 for a spouse of a British citizen | Depends on the provision |
| English and Life in the UK Test | Required | Not required for children under sections 1 and 3 |
| Good character | Required | Required for most applicants aged 10 or over |
| Main form | Form AN | Form MN1 for children; other forms for adults |
| Home Office fee | £1,709 | £1,540 for an adult; £1,000 for a child |
| Ceremony fee | £130 | £130 for an applicant aged 18 or over |
Adults attend a citizenship ceremony after approval, on both routes. The fees table adds the £130 ceremony fee to naturalisation and adult registration applications. Our guide to Form MN1 explains the children’s registration form.
Frequently asked questions
Can I choose between naturalisation and registration?
Not freely. The route depends on which provision of the British Nationality Act 1981 fits your circumstances. An adult born in the UK may meet both section 1(4) and section 6(1), and can then use either.
Can a child naturalise as a British citizen?
No. Section 6 applies only to a person of full age and capacity. A child becomes British after birth by registration, under section 1, section 3 or another registration provision.
Is registration quicker than naturalisation?
The Home Office does not publish separate processing standards that guarantee one route is faster. Our guide to British citizenship processing times sets out current timescales for both.
Is a registered British citizen the same as a naturalised one?
A person who registers or naturalises receives British citizenship. Whether that citizenship is “by descent” or “otherwise than by descent” depends on the provision used, which affects passing citizenship to children born abroad.
How Whytecroft Ford can help
The British Nationality Act 1981 contains many routes to citizenship, and the right one depends on details of birth, parents’ status and residence. Applying under the wrong provision can lead to a refusal, or to a higher fee and tests that another route would avoid. Whytecroft Ford’s IAA-regulated immigration team is experienced, approachable and professional. The team prepares naturalisation and registration applications for adults and children every day.
To discuss your application with our team, call 0208 757 5751 or use the contact form.
Disclaimer: The material in this article is provided for guidance and general information only and is not intended to constitute legal or other professional advice upon which you should rely. In particular, the information should not be used as a substitute for a full and proper consultation with a suitably qualified professional. UK Immigration Rules are subject to change. Please do contact the Whytecroft Ford team if you require further advice.
