ILR to British Citizenship: 2026 Step-by-Step Guide

You can apply for British citizenship 12 months after ILR is granted — not 12 months after you start counting residence. The clock starts on the date shown on your ILR decision letter, not on any earlier date. You also need to pass the Life in the UK test, hold B1 English, and meet the good character requirement before applying.

Key Facts

Detail	Information
Wait after ILR (standard route)	12 months from ILR grant date
Spouse/civil partner of British citizen	3 years' total residence + ILR — no additional 12-month post-ILR wait required
Max absences in 5 years before applying	450 days
Max absences in final 12 months	90 days
Application form	Form AN (online via UKVI account)
Fee (adult naturalisation)	£1,839
Processing time	Up to 6 months
Early application window	Up to 28 days before qualifying date
After approval	Citizenship ceremony required to complete the process

Quick Overview

✅ ILR is the direct route to British citizenship for most migrants — you apply 12 months after ILR is granted.

✅ You must still pass the Life in the UK test, meet the B1 English requirement, and satisfy the good character requirement.

✅ The 28-day rule lets you apply up to 28 days before your qualifying date — useful if your ceremony booking might push past the deadline.

✅ Once naturalised, your British citizenship cannot be lost through absence — unlike ILR, which lapses after 2+ consecutive years abroad.

⚠️ ILR is not the same as citizenship. You cannot get a British passport, vote in general elections, or hold a British passport until you naturalise.

⚠️ If you spend more than 450 days outside the UK in the 5 years before applying, you will likely not qualify. Count your absences carefully before applying.

⚠️ The fee is non-refundable if your application is refused. Make sure you meet all requirements before paying.

📌 If you are married to a British citizen, a different residence requirement applies (3 years, not 5). Check which route applies to you before you apply.

📌 Your qualifying date is 12 months after ILR — not 12 months after you submit your citizenship application.

💡 Use the citizenship planner to calculate your exact qualifying date and track your absences.

💡 Apply as soon as your 12 months are up. Processing takes up to 6 months, so earlier is better.

Introduction

ILR (Indefinite Leave to Remain) is the last step before British citizenship for most migrants. If you have ILR and want to understand what comes next, this guide covers the timeline, the requirements, and the exact steps to follow. You can also read our full comparison of ILR vs British citizenship to decide whether naturalisation is right for you.

The 12-Month Wait

After ILR is granted, you must wait 12 months before applying for citizenship. This waiting period exists because the law requires applicants to be "free from immigration time limits" — ILR gives you that status, and the 12-month wait is an additional residence requirement on top of ILR itself.

The 12-month period begins on the date your ILR was granted. Check your ILR decision letter or your Biometric Residence Permit (BRP) for this date. Your qualifying date for citizenship is exactly 12 months after that day.

If you apply before your qualifying date, your application will be refused.

The 28-Day Early Application Window

You can apply up to 28 days before your qualifying date. This matters for practical reasons. You submit your application early, the Home Office processes it, and you are approved on or after your qualifying date. This means your ceremony can take place sooner after your qualifying date.

Do not apply more than 28 days early. If you do, the application may be rejected as premature.

Absence Requirements

The residence requirement for citizenship looks at the 5 years before your application date. You must not have been absent from the UK for more than 450 days across that 5-year period. Within those 5 years, the final 12 months are treated more strictly — you must not have been absent for more than 90 days in the 12 months immediately before you apply.

Count every absence from the UK — including holidays, work trips, and family visits. Do not approximate. Use your passport stamps, boarding passes, and travel records to build an accurate count.

If you are close to the limit, consider delaying your application until your absences fall within the threshold.

Other Requirements

Life in the UK test: You must have passed the Life in the UK test. Your pass certificate must still be valid. Read our article on whether the Life in the UK test certificate expires for details.

B1 English: You need a recognised English language qualification at B1 level or above, unless you are exempt. Find out more about English language requirements for ILR and citizenship.

Good character: You must meet the good character requirement. This covers criminal convictions, immigration compliance, financial conduct, and other factors. Read the full good character requirement guide.

The Spouse and Civil Partner Route

If you are married to or in a civil partnership with a British citizen, a different residence requirement applies. The total residence requirement is 3 years (not 5), and you need ILR before applying . The absence threshold is lower on the spouse route: no more than 270 days in the 3 years before applying, and no more than 90 days in the final 12 months.

Check which route applies to you on GOV.UK before you start your application.

How to Apply: Form AN

You apply online using Form AN through your UKVI account. The online process guides you through:

Confirming your eligibility and route
Entering your travel history for the past 5 years
Uploading supporting documents
Paying the fee

The fee for adult naturalisation is £1,839. This fee is non-refundable. Do not pay until you are confident you meet all the requirements.

Supporting Documents

The online application tells you which documents to upload. These typically include:

Proof of ILR (BRP, eVisa confirmation, or passport vignette)
Life in the UK test pass certificate
English language qualification certificate
Travel history (passport copies showing departure and arrival stamps)
Two passport-sized photos

Check the current document list on GOV.UK when you apply — requirements can change.

Processing Time

The Home Office states a processing time of up to 6 months. Most straightforward applications are decided sooner than this, but do not plan around a faster outcome.

You cannot track your application in real time. If your application is delayed beyond 6 months, you can contact UKVI.

After Approval: The Citizenship Ceremony

Approval of your application does not make you a British citizen. You must attend a citizenship ceremony. The ceremony must take place within 3 months of your approval letter. If you miss this window, you will need to re-apply.

Your local council organises the ceremony. You will receive contact from them after your approval. Bring your approval letter and the documents they request.

At the ceremony, you take the Oath of Allegiance and the Pledge. You then receive your naturalisation certificate. This certificate is what you need to apply for a British passport.

After Naturalisation: Key Differences From ILR

Once you are a British citizen, several things change:

Absence: ILR lapses if you spend 2 or more consecutive years outside the UK. British citizenship is permanent — you cannot lose it through absence alone.

Travel: You can apply for a British passport and travel on it. Many countries offer British citizens visa-free or visa-on-arrival access.

Voting: British citizens can vote in UK general elections. ILR holders cannot.

Employment: British citizens can apply for certain jobs restricted to British nationals, including some civil service and security roles.

Family: The rules for sponsoring family members to come to the UK change when you become a British citizen.

Common Mistakes

❌ Counting from the wrong date — The 12-month wait starts from your ILR grant date, not from when you applied for ILR, and not from when you received your BRP card. Check your decision letter.

❌ Underestimating absences — People often forget short trips, work travel, or transit stops. Count every absence, however brief. Even a one-day crossing counts if it takes you out of the UK.

❌ Paying before checking eligibility — The fee is non-refundable. Make sure you clearly meet every requirement before submitting payment.

❌ Missing the ceremony window — Your ceremony must happen within 3 months of approval. Delays in booking or attending the ceremony can cause your approval to lapse.

❌ Applying on the wrong route — If you are married to a British citizen, the standard 5-year route may not apply to you. Applying on the wrong route can mean a refusal.

❌ Not checking your Life in the UK test pass is still valid — Read the article on whether the certificate expires before assuming yours is still valid.

Expert Tips

Calculate your qualifying date precisely, then count back 28 days. Apply on that date. This gives you the maximum benefit of the early application window and gets your application in as soon as legally possible.
Build your travel history before you start the application. Reconstructing 5 years of absences mid-application is stressful. Gather passport copies, boarding passes, and bank statements well in advance.
Check your good character position honestly. The good character requirement is broader than most people expect. It includes things like unpaid fines, tax compliance, and previous immigration overstays — not just criminal convictions.
Do not let your ILR-linked documents expire before you apply. If your BRP expires, get a replacement before submitting your citizenship application. An expired BRP can slow processing.
Keep your Life in the UK test pass certificate and English qualification certificate together. These are both required for the citizenship application. Losing either document causes significant delays.

FAQs

How long after ILR can I apply for British citizenship?

You can apply 12 months after your ILR was granted. You can also apply up to 28 days before that 12-month anniversary. Use our citizenship planner to calculate your exact qualifying date.

Do I have to take the Life in the UK test again for citizenship?

No. If you passed the Life in the UK test for your ILR application, the same pass certificate counts for your citizenship application — provided it has not expired. Check whether your certificate is still valid before applying.

What is the fee for British citizenship in 2026?

The adult naturalisation fee is £1,839. This is non-refundable. Check GOV.UK for the current fee before you apply, as fees can change.

Can I apply for citizenship if I have been outside the UK a lot?

It depends on your absence total. You must not have been absent for more than 450 days across the 5 years before applying, and no more than 90 days in the final 12 months. Count your absences carefully before applying.

What happens if my citizenship ceremony is delayed?

Your ceremony must take place within 3 months of your approval. If your local council has a long wait for ceremonies, book as soon as you receive your approval letter. Contact the council if you are at risk of missing the 3-month window.

Is British citizenship better than ILR?

For most people, yes. British citizenship is permanent and cannot lapse through absence. ILR can lapse if you spend 2+ consecutive years outside the UK. British citizenship also gives you voting rights, a British passport, and access to certain jobs. Read our full comparison at ILR vs British citizenship.

Can my family members also apply for citizenship when I naturalise?

No. Your citizenship does not automatically transfer to your family members. Each person must apply individually and meet the requirements in their own right, including residence requirements.

How This Aligns With Official Guidance

This article follows the Home Office guidance on British citizenship by naturalisation as published on GOV.UK. The 12-month post-ILR waiting period, the absence thresholds, the Form AN process, and the ceremony requirement are all confirmed in official Home Office guidance. Fees and processing times are subject to change — check GOV.UK for current figures before you apply.

Official Resources

Our Free Tools

Use our citizenship planner to calculate your qualifying date and track your absences. Before your ILR, prepare for the Life in the UK test with our free mock tests. The cheat sheet covers the key facts that appear most often in the test.

What to Do Next

Work out your qualifying date using the citizenship planner. Then count your absences for the past 5 years to confirm you meet the residence requirement. If you have not yet passed the Life in the UK test, start practising now at /practice — you need this pass before you can apply.