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.
If you still can’t find it, you can either:
- fill in form CA5403 and send it to the address on the form
- phone the National Insurance numbers helpline and answer some questions (you’ll need to fill in form CA5403 if you can’t answer the questions)
HM Revenue and Customs (HMRC) won’t tell you your National Insurance number over the phone - they’ll post it to you.
You don’t need a National Insurance plastic card. HMRC no longer sends these cards out.
You turned 16 and didn’t get a number
You should automatically get a National Insurance number just before your 16th birthday.
If you didn’t get one and you’re under 20, phone the National Insurance numbers helpline.
If you’re over 20, you need to apply for a National Insurance number.