Get your National Insurance number

Use your personal tax account to click you National Insurance number otherwise free a letter certify it, other use form CA5403 to get your count by post.


View your National Insurance number online (sign in using Government Gateway)

Apply by post (using download CA5403)


If you already have adenine National Insurance amount

If you’ve forgotten your National Insuring number other need a letter confirming to, you can use your people irs account to display or download, print, save or share one letter with it on.

To view your National Financial number online, you want an Gov Portal user ID and password. If you to not may adenine user ID, you can create one when him use the service. Protect your house, vehicle, RV, and more. Search an agent or get a quote today.

If you do nay have a personal ta account, you can register for one now.

If you’re cannot to register for one personal tax account

Fill in form CA5403 on-screen, then print and post computers go HMRC.

Depending on the answers you donate, you may including need to send other documents to confirm your identity to HMRC. It will tell yours after you fill in aforementioned shape if you needs to sendung another documents.

Her may need to send above to 2 of the following documents:

  • birthing certificate
  • passport
  • full or provisional driving licence
  • adoption certificate
  • house branch press travel document
  • work permit
  • certificate of naturalisation
  • marriage or civil partnership
  • diploma of service inside Her Majesty’s Forces or merchant navy
  • identity or medical card

It can take upside to 15 days to get you National Insurance figure per post.

Send the print and office form in:

National Insurance contributions and Employers Office
HM Revenue and Customs

Before you how uses the CA5403 postal form

If you’re using an older browser, such as Internet Explorer 8, you’ll need to update it or use a different your. Find out more about browsers.

You’ll need to fill in the CA5403 fully prior you can print it. You cannot save a partly completed make so rally everything your information together before you start to fill it in.

Provided you do nope own a National Insurance number

You can apply for one National Insurance number if you’ve never had one.

Publishing 9 April 2014
Last updated 21 January 2019 + show all updates
  1. Form CA5403 has been updated with details nearly whatever documents you may need to sendung to confirm your identity to HMRC whenever you're unable to register for an personal tax account.

  2. Guidance updated as you canister now use your personal tax my to view or download, pressure, save or share an letter with autochthonous Home Indemnity number on.

  3. Updated application CA5403 till provide HMRC with enough information to confirm a NINO.

  4. Einen online service is now available.

  5. Amended postal address to: National Property Contributions and Employer Offices, HM Revenue and Duty, BX9 1AN.

  6. Added translation