Who Needs a National Insurance Number?

A National Insurance (NI) number is required by anyone who works, pays tax, or claims benefits in the UK. If you fall into any of the categories below, you need an NI number:

• UK workers (employees) — your employer uses your NI number to report earnings and deduct tax
• Self-employed people — you need it to pay Class 2 and Class 4 National Insurance contributions
• Benefit claimants — most state benefits, including Universal Credit and Jobseeker's Allowance, require an NI number
• Students earning income — if you work part-time or during holidays and earn above the threshold
• Foreign nationals working in the UK — whether EU/EEA, Swiss, or non-EU, if you work in the UK you need one
• People approaching State Pension age — your NI record determines your pension entitlement

You should apply for an NI number before you start working if possible. If you already have a job lined up, apply immediately — the process can take several weeks, and your employer may place you on an emergency tax code until your number is registered.

If you are claiming benefits, you will need an NI number as part of the application process. For students starting part-time work, apply as soon as you accept a job offer.

Yes. Anyone working in the UK — regardless of nationality — needs a National Insurance number. This includes:

• EU/EEA and Swiss citizens — if you have Settled or Pre-settled Status under the EU Settlement Scheme, you still need an NI number for work and tax purposes
• Non-EU workers on visas — skilled workers, health and care workers, and other visa holders must apply for an NI number when they arrive in the UK
• Irish citizens — under the Common Travel Area arrangement, Irish citizens can work in the UK without a visa, but still need an NI number

Your right to work in the UK is separate from your NI number. You need both — the right to work proves you can legally be employed, and the NI number ensures your tax and contributions are recorded correctly.

Yes. If you are self-employed — whether as a sole trader, freelancer, or contractor — you need an NI number to:

• Register for Self Assessment with HMRC
• Pay Class 2 and Class 4 National Insurance contributions
• File your annual tax return
• Build up your State Pension entitlement

Without an NI number, you cannot properly register as self-employed or pay the correct NI contributions, which affects your pension and benefit entitlements.

Students need an NI number if they earn income above the National Insurance threshold (currently £12,570 per year). This typically applies to students who:

• Work part-time during term time
• Take on holiday or summer jobs
• Do paid internships or placements

If your earnings are below the threshold, your employer will still ask for your NI number to set up your payroll record correctly. It is best to apply as soon as you turn 16, before you start earning.

If you are not working, you may still need an NI number if you are:

• Claiming benefits — Universal Credit, Jobseeker's Allowance, and most other benefits require an NI number
• Receiving NI credits — if you receive credits for caring responsibilities, illness, or unemployment, these are recorded against your NI number
• Approaching State Pension age — even if you are not currently working, your NI record determines your pension entitlement

If you are not working, not claiming benefits, and not approaching pension age, you may not urgently need an NI number — but you should still apply for one when you turn 16, as you will need it later.