Find a lost National Insurance number

If you do not know your National Insurance number, the quickest and easiest way to find it is:

  • online through your personal tax account
  • on a document you already have, for example a payslip or P60

HM Revenue and Customs (HMRC) will not tell you your National Insurance number over the phone. If you call them, it can take up to 15 days to get a letter with your National Insurance number.

This page is also available in Welsh (Cymraeg).

Find your National Insurance number online

If you have a personal tax account, you can sign in to:

  • view your National Insurance number
  • print a letter from HMRC with your National Insurance number on

Sign in using Government Gateway. You’ll be able to register for Government Gateway if you have not used it before.

You can no longer use GOV.UK Verify to sign in.

Find your National Insurance number on a document

You may be able to find it on your:

  • payslip
  • P60
  • letters about tax, pensions or benefits

Ask HMRC for your National Insurance number

If you still cannot find it, you can:

HMRC will post it to you and it will arrive within 15 working days.

HMRC no longer sends out National Insurance cards.

If you’ve never had a National Insurance number

You can apply for a National Insurance number if you’ve never had one.