You can usually find your National Insurance number on official UK tax or benefits paperwork you already have, or by using HMRC’s online services through GOV.UK. If you really cannot find it anywhere, HMRC can send you a confirmation letter to the address they hold for you.

Quick Scoop

Check your existing documents

Most people already have their National Insurance number printed on everyday official documents.

  • Payslips from your employer.
  • P60 or P45 tax documents.
  • Letters or emails about tax, benefits or pensions.
  • Letters from the Department for Work and Pensions or HMRC.
  • Pension statements or some bank statements that show state pension payments.

Your NI number has the format QQ 12 34 56 C (2 letters, 6 numbers, then a final letter A, B, C or D).

Use GOV.UK online services

If you live in the UK and have online tax access, you can view your NI number digitally.

  • Sign in to your personal tax account on GOV.UK to see your National Insurance number.
  • Or use the HMRC app , which can show your NI number and let you download a letter with it.
  • If you’ve saved it before, it may also be in your Apple Wallet or Google Wallet.

If you pass the identity checks (for example with your passport or driving licence), you can view it on screen; if not, HMRC will post it to you instead.

If you still can’t find it

If none of the above works, there are still options.

  • Ask HMRC for a letter confirming your National Insurance number ; they will post it to the address they hold for you (this can take around 10 working days in the UK or longer abroad).
  • You can fill in form CA5403 (on GOV.UK), print it, and post it to the address on the form to request your NI number.
  • HMRC will not usually give your NI number directly over the phone or webchat for security reasons.

Quick forum-style tip

If you’re panicking, start with your latest payslip or P60, then log into your GOV.UK tax account or the HMRC app. Only if you strike out on those should you move on to forms and posted letters.

Where do i find my national insurance number – in most cases: check payslips or tax documents, then your GOV.UK personal tax account or HMRC app, and if all else fails, request a confirmation letter from HMRC.

Information gathered from public forums or data available on the internet and portrayed here.