You can find your National Insurance number on your payslip, P60, or letters about tax, pensions and benefits. If you have a personal tax account you can also view it there and print a confirmation letter.
If you still can’t find it, you can either:
HM Revenue and Customs (HMRC) won’t tell you your National Insurance number over the phone. They’ll post it to you and it will arrive within 10 working days.
You don’t need a National Insurance plastic card. HMRC no longer sends these cards out.
You can apply for a National Insurance number if you’ve never had one.
Don’t include personal or financial information like your National Insurance number or credit card details.