You can find your National Insurance number on your payslip, P60, or letters about tax, pensions and benefits. You can also find it through your personal tax account and download a confirmation letter.
If you still cannot find it, you can either:
HM Revenue and Customs (HMRC) will not tell you your National Insurance number over the phone. They’ll post it to you and it will arrive within 15 working days.
You do not need a National Insurance plastic card. HMRC no longer sends these cards out.
If you’ve never had a National Insurance number
You can apply for a National Insurance number if you’ve never had one.