Table of Conten

If you have moved to the UK and plan to work, check whether you already have a National Insurance number before applying for one. Some people receive a number with their immigration status. If you do not have one, you can apply online once you are in the UK and meet the eligibility rules.

Quick Answer

You can apply for a National Insurance number if you live in the UK, have the right to work, and are working, looking for work, or have a job offer. First check your eVisa or an older biometric residence permit, as your number may already be there. If you need to apply, use the official GOV.UK service. You can start a permitted job before the number arrives if you can prove your right to work.

Why This Matters

A National Insurance number helps ensure that your tax and National Insurance contributions are recorded against your name. You will usually be asked for it when starting a job.

For someone who has just arrived, the confusing part is often the order of steps. You do not have to wait for a National Insurance number before looking for work, and the number itself does not give you permission to work. Your immigration status and the employer’s right to work check are separate matters.

Do You Already Have a National Insurance Number?

Before starting an application, check whether a number has already been assigned to you. It may appear when you sign in to your UKVI account to view your eVisa. If you have an older biometric residence permit, check the back of the card.

If you have worked in the UK before, you may already have a number. Your National Insurance number stays the same for life, even if your personal details or immigration status change.

Who Can Apply for a National Insurance Number in the UK?

You can apply if you:

  • live in the UK
  • have the right to work in the UK
  • are working, looking for work, or have an offer to start work

You can only apply after you are in the UK. If you already have a number, you do not need to apply again. These conditions are set out in the government’s eligibility guidance.

How Do You Apply?

Apply through the GOV.UK online application. You will need to prove your identity.

If you have a passport from any country, or an eligible European national identity card, have it ready. The application may ask you to upload photographs of your documents and a photograph of yourself holding your passport. Follow the instructions you receive during the application rather than preparing photographs to your own specifications.

You can still apply if you do not have those documents or cannot upload photographs. You may then need to attend an appointment or provide other evidence, and the process can take longer. After you submit the application, keep the email containing your reference number.

How Long Does It Take?

GOV.UK says it can take up to 4 weeks after you have proved your identity to receive your National Insurance number. That means the time spent providing additional identity evidence may come before the 4-week period.

If you applied more than 4 weeks ago, moved house after applying, or changed your personal details, use the contact information on the official application page. Have your application reference ready. Check that page again when you apply, as processing guidance can change.

Can You Start Work Without a National Insurance Number?

Yes. You can start work before receiving your number if you can prove that you have the right to work in the UK. Let your employer know that you have applied, then provide the number when you receive it.

Your employer still needs to carry out the appropriate right to work checks. A National Insurance application reference is not a substitute for evidence of your permission to work.

What Else Should You Arrange After Moving?

A National Insurance number is one part of settling in. Your first 30 days in the UK may also involve setting up healthcare and understanding local transport.

For example, GP registration is a separate healthcare task. If you intend to drive, check the rules for exchanging a foreign driving licence. Neither task requires you to finish your National Insurance application first.

Common Mistakes

Applying before checking whether you already have a number

Check your eVisa, older biometric residence permit, and previous UK records first. A change of visa or job does not create a need for a new number.

Assuming a number proves your right to work

Your work permission comes from your immigration status or another qualifying basis. A National Insurance number is used for tax and contribution records.

Waiting for the number before starting a permitted job

GOV.UK says you may start work while waiting if you can prove your right to work. Tell your employer what stage your application has reached.

Losing your application reference

Keep the confirmation email. The reference will help if you need to ask about a delayed application or report a change of address.

Where to Go Next

If you are organising work and everyday life after arriving, these related guides cover the next practical steps:

FAQs

No. You can apply only once you are in the UK and meet the eligibility conditions.

Yes, if you can prove your right to work. Your employer must still complete the required right to work check.

It might be. Sign in to your UKVI account and check before submitting an application.

GOV.UK says it can take up to 4 weeks after you have proved your identity. Check its current guidance if you have waited longer.

No. Your National Insurance number remains the same for life.

Final Thoughts

A National Insurance number helps ensure your tax and contributions are recorded correctly, but it does not determine whether you have permission to work in the UK.

Check whether you already have a number before applying. If you need one, apply once you are in the UK, keep your application reference, and make sure you can prove your right to work if a job starts while you are waiting.

If you are unsure how your immigration status affects your work plans, book a consultation with UKGIC. Our advisers can help you understand your work permission and the UK pathway that best suits your circumstances.