Lost my National Insurance number

I can't find my National Insurance number. What should I do?

1st May 2014

If you've lost or can't remember your number, you might be able to find it on official paperwork like:

  • your P60 (end of year tax statement, given to you by your employer)
  • a payslip
  • a copy of your annual Self Assessment tax return
  • other official correspondence

If you still can't find your number, you can ask HMRC to confirm it by:

  • completing and returning form CA5403 - Your National Insurance number
  • contacting the National Insurance Registrations Helpline on telephone 0300 200 3502. You will be asked some questions to confirm your identity. If you can answer these questions correctly HMRC will send your National Insurance number by post. If you can not answer the questions you will need to complete form CA5403.

HMRC cannot confirm your National Insurance number by telephone. They will write to you instead.

By Jo Nockels

Disclaimer: Advice shared in this blog is intended to inform rather than advise. Taxpayer's circumstances do vary and if you feel that the information provided is beneficial it is important that you contact us before implementation. If you take, or do not take action as a result of reading this forum, before receiving our written endorsement, we will accept no responsibility for any financial loss incurred.

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