National Insurance numbers

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  • Telephone: 0300 200 3500
  • Textphone: 0300 200 3519
  • Outside UK: +44 191 203 7010

Call to get advice if:

  • you’re between 15 years and 9 months and 20 years old and haven’t received a National Insurance number
  • you’ve lost or can’t remember your National Insurance number
  • you need a letter confirming your National Insurance number

HMRC can’t confirm National Insurance numbers over the phone.

Apply for a National Insurance number if you’re over 20 years old and haven’t got one.

Find out about call charges

Opening times:

8am to 8pm, Monday to Friday
8am to 4pm, Saturday

Closed Sundays and bank holidays

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Don’t include personal or financial information like your National Insurance number or credit card details.