What Is a National Insurance Number and Why You Need One
A National Insurance (NI) number is a unique reference used by HMRC and the Department for Work and Pensions to track your tax and National Insurance contributions once you start working in the UK. Every international student who plans to work part-time needs one — without it, you may be taxed at a higher emergency rate until your details are confirmed.
How to Apply
- Apply online through the official gov.uk National Insurance number application service after you arrive in the UK
- You will need your eVisa (digital immigration status) and your UK address
- In some cases you may be asked to attend an identity verification appointment
- Processing typically takes several weeks, so apply as soon as possible after arrival — ideally in your first week
Can You Work Before Your NI Number Arrives?
Yes. You do not need an NI number to start a job — employers can pay you and report your details to HMRC using a temporary reference while your NI number is processed. However, applying immediately is still important, since delays can affect your tax code and how much tax is deducted from your early pay.
Where to Find and Use Your NI Number
Once issued, your NI number arrives by letter to your UK address. Keep it safe — you will need it every time you start a new job, for tax purposes, and if you ever apply for certain UK benefits or services later. It never changes, even if you switch employers or universities.
Keep reading: Step-by-step UK Student visa guide · 28-day bank statement rule