British citizenship applications for children start with a status question: is the child already British, or do they need to register? A child born in the UK to a British or settled parent may be British automatically; some children born abroad to a British parent are also British from birth. Other children can apply to register under an entitlement route or ask the Home Secretary to use discretion. The correct path depends on the child’s birth place and date, parent’s citizenship and immigration status, family residence history, armed-forces service, adoption and age.
Check automatic citizenship first
MN1 covers several different routes
Age and evidence matter
First check whether the child is already British
Do not start with an application form. First establish the child’s date and place of birth, the legal relationship to each parent, and each parent’s citizenship and immigration status on the birth date. Adoption, armed-forces service, the date of a parent’s settlement, the child’s own residence and older nationality-law changes can all affect the answer.
A child born in the UK on or after 1 January 1983 may have acquired British citizenship automatically if a parent was British, settled in the UK, or in certain circumstances serving in the UK armed forces when the child was born. “Settled” has a legal meaning; it is not the same as simply living in the UK or holding temporary permission. Some children born abroad to a British citizen parent are British automatically by descent, but the parent’s own citizenship status and the circumstances of birth can affect transmission. The current Form MN1 guidance lists automatic-acquisition rules and exceptions.
If the child is already British, do not use Form MN1 to register them again. The practical task may instead be to gather the child’s full birth certificate and parent-status documents to support a British passport application or resolve a status-evidence question. Where dates, parentage, historic EEA residence, adoption or Crown service make automatic status uncertain, check the official guidance or obtain qualified nationality advice before deciding that registration is required.
This guide covers common registration routes for children under 18. It is not a substitute for the separate rules for British Overseas Territories citizenship, stateless children, some Hong Kong cases, historical unmarried-parent routes, adult registration or other specialist provisions. The Home Office’s Form MN1 guide identifies the provisions it covers and directs applicants to separate forms where appropriate. Stateless applicants should use the separate Form S guide for stateless-person nationality registration.
Compare the main routes for children
“Entitlement” means the child may have a statutory right to registration if the legal requirements are met. “Discretion” means the Home Secretary decides whether to grant registration on the facts and policy. These routes are not interchangeable, and a family should identify the section that matches the child’s history before preparing a document bundle.
Scroll horizontally or use the arrow keys to view all columns.
| Route | Broad situation | Important point to verify |
|---|---|---|
| Section 1(3) | A child born in the UK after 1 January 1983 was not British at birth, but while still a minor a parent later became British or settled in the UK | The child must be under 18 when the application is received; a full UK birth certificate and proof of the parent’s later British citizenship or settled status are central evidence |
| Section 1(3A) | A child born in the UK on or after 13 January 2010 was not British at birth, and a parent becomes a member of the UK armed forces while the child is a minor | Check the exact birth date, parent’s qualifying service and application-receipt age with current guidance |
| Section 1(4) | A person born in the UK has lived there for the first ten years of life, with no more than 90 days’ absence in each year under the statutory test | This is a separate route using Form T; do not assume the MN1 application or its evidence list applies |
| Sections 3(2) and 3(5) | A child born abroad to a British citizen by descent may qualify through a British grandparent’s history or through a later three-year family residence period | Which section applies affects the family residence evidence and whether the child becomes British by descent or otherwise than by descent |
| Section 3(1) | A parent is applying for British citizenship with the child, or a child is considered under a discretionary registration policy | This is not an automatic grant; the child’s circumstances, residence, status, best interests, consent and the Home Office policy all matter |
| Section 4D | A child born abroad on or after 13 January 2010 to a parent serving in the UK armed forces may have a specific registration route | Confirm the parent’s service status and location on the date of birth and the child’s other conditions |
The table is a route map, not an eligibility decision. It leaves out detailed exceptions and routes that use other forms. For example, an under-18 child born in the UK who lived there for the first ten years may need Form T; a child who has always been stateless follows the separate Form S guidance linked above. A child born in Hong Kong, a child whose claim depends on an unmarried British father, a child adopted abroad or one with a complex EEA-parent history may also require a different provision. Use the current route-specific pages instead of forcing an unusual case into the nearest row.
UK-born children whose parent later becomes settled or British
GOV.UK describes a route for a child born in the UK where a parent later became British, obtained indefinite leave to remain or indefinite leave to enter, received settled status, or had qualifying permanent residence status. The child must still be under 18 when the application is made. The route page directs parents to read the MN1 guidance for the detailed legal test and supporting documents.
For section 1(3), the evidence usually needs to connect the child’s full UK birth certificate with the parent’s later status. Depending on the claim, that may include the parent’s British passport, naturalisation or registration certificate, or evidence of ILR/settled status. Older births or a claim through a father can require additional relationship or marriage evidence. Do not rely on a screenshot of a current status account if the guidance requests a document that proves the parent’s status at the relevant date.
The child’s own immigration permission and residence may matter for other routes, but do not import a requirement from the discretionary section 3(1) policy into an entitlement application without checking which provision applies. The same facts can be relevant in different ways across different legal sections.
Children born abroad to a British parent by descent
A British citizen by descent cannot normally pass citizenship automatically to a child born abroad in the same way as a British citizen otherwise than by descent. Some children can instead qualify to register under section 3(2) or section 3(5). Both routes require a detailed family history; they are not the same as Foreign Birth Registration for Irish citizenship.
In broad terms, section 3(2) can apply where the child’s British-by-descent parent has a qualifying British grandparent and meets the required period of residence in the UK or a qualifying British Overseas Territory before the child’s birth. Section 3(5) instead looks at a three-year residence period for the child and both parents immediately before the application, including presence at the start of that period and the applicable absence limit. The parent’s marriage or civil-partnership history and the child’s birth date can affect which evidence is needed.
The citizenship outcome also differs: registration under section 3(2) makes the child British by descent, while section 3(5) makes the child British otherwise than by descent. That distinction can matter for whether the child can automatically pass British citizenship to a child of their own who is born abroad. Read the current section-specific guide before selecting a route or deciding whether the timing of an application matters to the family.
Discretionary applications and parents applying at the same time
Section 3(1) is a discretionary route. Home Office guidance includes situations where a parent is applying to naturalise or register as British and seeks registration for a child, as well as other applications considered under the published child-registration policy. The caseworker guidance sets out usual criteria, but the decision remains a Home Secretary decision under the relevant law and policy. Satisfying one factor does not guarantee a grant.
When parent and child applications are submitted together, the child’s application may have an independent basis for registration even if the parent’s application is refused. The MN1 guidance says the form asks whether the child should still be registered in that situation. Read that question carefully and understand the consequences before submitting; the Home Office may treat the child’s application as withdrawn if the relevant option is not completed and the parent’s application is refused. The application fee is not necessarily refunded.
Where a second parent has parental responsibility or is involved in the child’s life, check the consent requirements and the form’s questions. If a parent objects, is unavailable or has died, the evidence and legal position can differ. A guardian applying for a child may need documents showing their authority. The Home Office may assess the child’s best interests and the family circumstances, but this guide cannot assess consent, care arrangements or whether an exception applies.
Prepare evidence for the actual section
Start with the current MN1 guidance and the application checklist for the exact nationality section. The Home Office lists identity evidence such as the child’s passport or travel document, full birth certificate, or another accepted identity document. It may also require records for parents, grandparents, residence, the child’s immigration history, parental responsibility and consent. The required bundle changes by route.
For a section 1(3) application, the child’s full UK birth certificate and evidence of the parent’s later British citizenship or settled status are central. For a section 3(2) application, the file can need the child’s birth certificate, the relevant parent’s citizenship proof, the grandparent’s birth/citizenship documents, family civil records and evidence of the parent’s qualifying residence before the child was born. For section 3(5), prepare residence evidence for the child and parents across the relevant three-year period, with a clear travel record. For a discretionary case, the evidence should address the relevant published policy factors and explain any unusual circumstances honestly.
Keep an evidence index that connects each document to a person and a legal fact: who is the child’s parent, when did the parent become British or settled, where did each person live, when were absences, and who has parental responsibility? Check names and dates across certificates, passports and immigration records. If a record is missing, do not substitute a different document without checking whether the current guide allows it. Use certified translations where required and upload clear, complete copies as directed by the service.
Age, good character and fee waiver
The child generally must be under 18 when the application is received by the Home Office or receiving authority. A child who is close to 18 should check the receipt-date rule and current application steps early; a draft saved online is not necessarily a submitted application. If the application is received before the child’s 18th birthday but the child turns 18 before the decision, a ceremony and its additional fee may be needed if the application succeeds.
The Home Office says an applicant aged 10 or over must meet the good-character requirement. This assessment is distinct from the route’s birth, residence or parent-status test. Read the current guidance and answer the application questions fully. A child’s age and circumstances can affect how evidence is considered; this guide cannot assess an individual good-character decision.
As checked on 28 October 2026, GOV.UK lists the child registration application fee at £1,000. The fee table says a further £130 ceremony fee is required if the child turns 18 during the application process. Fees can change; confirm the current amount and payment stage before applying.
A parent or legal guardian may request a child citizenship fee waiver if the child is under 18 and the household cannot afford the fee while meeting accommodation and essential living needs. For online applications, GOV.UK says the fee-waiver decision must be received before the citizenship application is made; a successful online request provides a token for the registration application. The waiver assesses affordability, not the nationality claim. Being granted a fee waiver does not mean the child will be registered.
GOV.UK says a child looked after by a local authority should not apply for the ordinary fee-waiver process; the citizenship application should instead include evidence of that status under the current instructions. Read the live waiver page carefully, including whether the same online or paper route must be used for both requests. Do not submit sensitive financial details anywhere except the official Home Office service.
Apply and understand the decision stage
Most applicants living in the UK can apply online. The current route page says an online applicant will be asked to attend a UKVCAS service point to provide biometrics, and can upload documents or have them scanned at the appointment. A parent or guardian may help complete the application, but the details and declarations must be accurate. People applying from the Channel Islands, Isle of Man or a British Overseas Territory have different online and paper arrangements; follow the location-specific instructions.
The Home Office’s MN1 guidance was updated in 2026, including information about priority service and when a child becomes British. Check the live service before relying on an older application PDF or postal address. GOV.UK’s UK-born child route usually gives a decision within six months, but some cases take longer; a service estimate is not a deadline or promise. Other routes may have different processing information.
If the child is under 18 when the application is decided and registration is granted, they do not have to attend an adult citizenship ceremony and become British on the approval date under the current guidance. If the child has turned 18 by the decision, the ceremony requirement and fee can apply before citizenship takes effect. The Home Office will provide the certificate or next-step instructions. After registration, a separate British passport application is required for travel documents.
Before applying, consider whether the child’s existing nationality law allows dual nationality or causes the child to lose another nationality when becoming British. The Home Office says applicants should seek advice from the child’s other country where needed. Immigration status, a registration certificate and a passport are distinct matters; do not assume that an application receipt or approval letter alone is sufficient for a planned journey.
For adults applying under Form AN, see our UK citizenship by naturalisation guide. For a child who needs permission to enter or stay in the UK with a parent rather than British citizenship, see the UK child Family visa guide. A Family visa and British nationality application answer different questions.
A practical preparation sequence
- 1Check automatic status — Write down the child’s birth date and place, parentage, parents’ citizenship and settlement at birth, adoption and any service history.
- 2Identify the legal section — Compare the facts with the current MN1 guide; check whether the claim uses another form or specialist guidance instead.
- 3Confirm age and consent — Check when the Home Office will receive the application, good-character rules at age 10 or over, parental consent and guardian authority.
- 4Build the route-specific evidence index — Collect the child and family records that prove the chosen section, residence dates, citizenship chain and other required conditions.
- 5Check fee and application service — Review the live fee, any fee-waiver sequence, biometrics and location-specific application instructions before submitting.
- 6Plan for the decision and travel — Check whether the child may turn 18 during processing, whether a ceremony applies, and what passport or travel document will be needed afterward.
Frequently asked questions
Does every child born in the UK automatically become British?
Should I use Form MN1 if my child is already British?
What are the main routes covered by Form MN1?
How old must a child be when the application is submitted?
Does the child have a good-character requirement?
What is the difference between section 3(2) and section 3(5)?
Do both parents have to consent?
How much does child registration cost?
Can I request a fee waiver?
Does a child attend a citizenship ceremony?
Can I register a child while I apply for British citizenship?
Does this guide decide which nationality section applies?
Official sources
- GOV.UK: Form MN1 guidance — provisions covered, automatic citizenship, route tests, documents, age, good character, ceremony and travel.
- Home Office: Registration as British citizen, children — caseworker policy on entitlement and discretionary routes.
- GOV.UK: Child born in the UK and under 18 — route overview, online application, biometrics, fee and current decision estimate.
- GOV.UK: Apply for children if you have ILR or settled status — when a child may be British automatically and when a separate registration is needed.
- GOV.UK: Citizenship application fees — child registration and possible ceremony fee.
- GOV.UK: Child citizenship fee waiver — affordability route and fee-waiver application sequence.
- GOV.UK: Register a child under 18 as British (Form MN1) — current form and online/paper application scope.
Nationality rules, fees, forms and processing information can change. Recheck the current GOV.UK route and application instructions before acting. This guide is an overview, not a decision on a child’s nationality or registration outcome.