Registering A Child As A British Citizen – MN1 Application

Registering your child as a British citizen in 2026? Our step-by-step MN1 form guide covers who qualifies, what documents you need, the £1,214 fee and how long it takes.

Registering your child as a British citizen is one of the most important steps you can take to secure their future in the UK. It opens the door to a British passport, permanent freedom from immigration controls, and the right to live, work, and study in the UK without restriction.

Children who are under the age of 18 years can apply for registration as British citizens using MN1 Application under various sections of the British Nationality Act 1981. Children must be under 18 years old when the application is made. Once they reach the age of 18 they must apply for British citizenship as adults, either by registration if they have an entitlement, or by naturalisation.

Table of Contents

What Is Form MN1?

Form MN1 is the official UK Home Office application form used to register a child under the age of 18 as a British citizen. The most recent version of the form is version 03/2026, published in March 2026 by UK Visas and Immigration (UKVI).

The form covers children who qualify for British citizenship through birth, adoption, parental citizenship status, or special circumstances. It is accompanied by the MN1 Guide (February 2026), which you must read in full before completing the application.

Important: Once a child reaches 18, they can no longer use Form MN1. Adults must apply using Form AN (naturalisation) or a registration route for adults.

Who Can Apply Using Form MN1?

Form MN1 covers several distinct routes to British citizenship for children. These routes are defined by the British Nationality Act 1981 and fall into two broad categories: entitlements (where the child has a legal right to register) and discretionary registrations (where the Home Secretary decides based on the child’s circumstances).

Entitlement Routes

The following sections of the British Nationality Act 1981 give a child an automatic right to be registered if they meet all the legal requirements:

• Section 1 (3) birth in the UK to parents who are now settled in the UK or have become British citizens;
• Section 1 (3A) birth in the UK to parents who have joined the armed forces;
• Section 3 (1) child whose parents are applying for British citizenship;
• Section 3 (2) birth abroad to parents who are British by descent and have lived in the UK or a British overseas territory;
• Section 3 (5) birth abroad to parents who are British by descent but are now living in the UK or a British overseas territory;
• Section 3 (1) children adopted abroad by British citizen parents;
• Section 3 (1) children whose parents had renounced and subsequently resumed British citizenship;
• Section 3 (1) any other case not listed below where it is considered to be in the child’s best interests to be granted British citizenship;
• Section 4D birth abroad to parents serving in the armed forces

Who Does NOT Need to Apply Using Form MN1?

Some children are already British citizens automatically and do not need to register. You should check whether your child may already hold British citizenship before making an application, as fees are not refunded if an application is unnecessary or refused.

A child may already be a British citizen automatically if:

• They were born in the UK and at least one parent was a British citizen or settled in the UK at the time of their birth
• They were born in the UK and at least one parent was a member of the UK armed forces
• They were born abroad to a British citizen parent who was themselves born in the UK (British citizenship by descent — though note this can only be passed on for one generation born outside the UK)

Other forms may be more appropriate in certain cases:

Requirements to register a child as a British citizen?

Children are entitled to registration under section 1(3) of the British Nationality Act 1981 if:

• they were born in the UK
• they were not British citizens at birth because at the time neither parent was a British citizen or settled
• while they are minors either of the parents has since become a British citizen or settled in the UK
• they are under the age of 18 on the date the application is received
• they are of good character if over the age of 10

How to apply to register a child as a British citizen?

You can make an application online or by post using the form MN1 for registration of a child under 18 as a British citizen in accordance with British Nationality Act 1981.

If you want to get British citizenship for your child, you can apply to ‘register’ them as a British citizen. Registering is a way of applying for British citizenship. Your child needs British citizenship before they can get a UK passport.

If your child is over 18 years old, they’ll need to apply as an adult – check citizenship eligibility for adults.

MN1 Application Fee 2026

The current fee to register a child as a British citizen using Form MN1 is £1,214.

If the child turns 18 during the application process, an additional £130 citizenship ceremony fee becomes payable if citizenship is granted.

Fee Waivers For MN1 Form

A fee waiver may be available for children under 18 who cannot afford to pay the application fee. Details of eligibility for a fee waiver are available on GOV.UK. UKVI will reject your application if the incorrect fee is submitted, so verify the current fee schedule before filing.

Processing Times

Processing times for MN1 applications vary depending on the complexity of the case and current UKVI workload. In most straightforward cases, applications are typically processed within 8 to 12 weeks. However, more complex or incomplete applications can take significantly longer — in some cases 6 months or more.

Getting Professional Help

The MN1 form is complex, and a refused application means losing the fee. If you are unsure about which route applies to your child, or if your child’s circumstances are unusual, you should consult a solicitor.

Immigration lawyer fees for MN1 Application

At Deluxe Law Chambers, our UK nationality lawyer charges a fixed fee between £700-£900 for our complete legal services in relation to your citizenship application. The agreed fixed fee will depend on the complexity of the matter and the casework involved in the matter.