National Insurance: general enquiries


Get your National Insurance number

If you’ve lost or forgotten your National Insurance number, or need a letter confirming it, you can:

  • register for or log in to your personal tax account to view or download, print, save or share a letter with it on
  • fill in the online form and post it to us, if you’re unable to register for a personal tax account

You can also find your National Insurance number on your payslip, P60, tax returns or official letters about tax, pensions or benefits.

Check your National Insurance record

Use this service to:

  • see any gaps in your National Insurance contributions
  • see gaps in your National Insurance contributions

Check your State Pension

Use this service to find out:

  • how much State Pension you could get
  • when you can get it
  • how to increase it, if you can

Tell HMRC you've changed name or address

If HMRC needs to contact you about anything confidential they’ll reply by phone or post.


Call for help and information about:

  • Class 1 National Insurance rates and thresholds
  • Class 2 and 3 National Insurance
  • Statutory Payments
  • Married Women’s Reduced Rate Election
  • National Insurance statement requests
  • employment histories
  • Parents and Carers credits
  • gaps in your National Insurance contributions

Contact Income Tax: general enquiries if you have a question about Class 4 National Insurance.

If you have a National Insurance number, have it with you when you call.

Call this number if you haven’t received your National Insurance number or have lost or forgotten it.

0300 200 3500

0300 200 3519

Outside UK:
+ 44 191 203 7010

Opening times:

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

Closed Sundays and bank holidays.

HMRC may ask if you want to add voice identification to your account. You can find out more in the Voice Identification Privacy Notice.

Find out about call charges


Write to HMRC at this address with all National Insurance queries except complaints.

You don’t need to include a street name, city name or PO box when writing to this address.

Couriers should use a different address.

PT Operations North East England
HM Revenue and Customs
United Kingdom