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How to get a National Insurance number
Your National Insurance number is needed before you can work or claim benefits in the UK - here is how to apply online.
Last checked 3 September 2026
A National Insurance (NI) number is a personal reference used for tax and National Insurance contributions. You can start work before it arrives, but you should apply as soon as you can so your contributions and tax are recorded correctly.
Do you need to apply?
- If you already have an NI number (for example, printed on an old BRP), you do not need to apply again - you keep the same number for life.
- You must have the right to work or study in the UK to apply.
How to apply
- Apply online on the official page: gov.uk/apply-national-insurance-number.
- You may be asked to prove your identity - have your passport and visa/eVisa details ready.
- Follow any instructions to confirm documents. Some applicants are asked to attend an appointment or upload documents.
- Your NI number is posted to you, usually within a few weeks.
Can you work while you wait?
Yes. You are allowed to start work before your NI number arrives, as long as you have the right to work. Tell your employer you have applied and give them the number as soon as you receive it.
Keep it safe
Your NI number is personal. Never share it casually, and be cautious of anyone charging a fee to “get” you a number - applying through GOV.UK is free.
Always confirm the current process on the official page: gov.uk/apply-national-insurance-number.
General information only, not advice. Always check the official source before you act.
Written by the Belayat team from GOV.UK, NHS and other official sources, and checked again on the date above. We update a guide when the rules change.