Guidance
Get your National Insurance number by post
Use form CA5403 to request a copy of your National Insurance number by post.
Where to find your National Insurance number
Your National Insurance number will be on tax-related documents like your Payslip or P60. You can also find your National Insurance number and get a copy of it online.
If you need to request a copy of your National Insurance number by post
If you cannot find your National Insurance number on any of your documents or by using the online service, you can:
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Print it.
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Sign the declaration.
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Include any documents to confirm your identity.
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Post it to HMRC.
Send the print and post form to:
National Insurance contributions and Employers Office
HM Revenue and Customs
BX9 1AN
If you’ve never had a National Insurance number
You can apply for a National Insurance number if you’ve never had one.
Published 8 May 2024