Print your National Insurance number letter from your personal tax account, or apply by post.
Already know your National Insurance number: apply online (sign in to, or set up a Government Gateway account)
Ref: CA5403 https://public-online.hmrc.gov.uk/lc/content/xfaforms/profiles/forms.html?contentRoot=repository:///Applications/NICs_iForms/1.0/CA5403&template=CA5403.xdp
If you already know your National Insurance number
Use your personal tax account to print your National Insurance number letter. You’ll need to sign in to, or set up a Government Gateway account.
If you don’t know your National Insurance number
Fill in the on-screen form, then print and post it to HM Revenue and Customs.
Send the print and post form to:
National Insurance contributions and Employers Office
HM Revenue and Customs
Before you start using the postal form
If you’re using an older browser, eg Internet Explorer 8, you’ll need to update it or use a different browser. Find out more about browsers.
You’ll need to fill in the form fully before you can print it. You can’t save a partly completed form so gather all your information together before you start to fill it in.
Related forms and guidance
Apply for a National Insurance number
Guidance on how to get a National Insurance number.
Published: 9 April 2014
Updated: 22 December 2015
- An online service is now available.
- Amended postal address to: National Insurance Contributions and Employer Office, HM Revenue and Customs, BX9 1AN.
- Added translation