Request a National Insurance number letter

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Before you start

Complete this form to:

  • get a letter confirming your National Insurance number
  • report a change of details

You may need to send up to 2 of the following documents to confirm your identity to HMRC:

  • birth certificate
  • passport
  • full or provisional driving licence (plastic card)
  • adoption certificate
  • home office or travel document
  • work permit
  • certificate of naturalisation
  • marriage or civil partnership certificate
  • certificate of service in Her Majesty's Forces or merchant navy
  • identity or medical card

The letter HMRC send you can be used as proof of your National Insurance number.

If you do not have a National Insurance number

Do not complete this form if you've never had a National Insurance number before. Instead you should apply for National Insurance number online.


You must be over the age of 16.

You must already have a National Insurance number even though you may have lost or misplaced it.

Need help?

Not sure exactly what you're looking for or just want clarification? We'd be happy to chat and clear things up for you!

Call (Mon-Fri, 9am-5pm)

+44 (0) 333 014 7210

Email us

[email protected]

Need something else?

We offer a range of National Insurance number services.

Written Confirmation

Get letter

Plastic Card

Get card