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Register your household

National Insurance Number checker

National Insurance check
To begin, please enter the National Insurance number of the primary applicant.
If you have lost your NI number you should contact HM Revenue and Customs. You can either complete the online form on the HMRC website, or call the National Insurance enquiries helpline on 0300 200 3500 (lines are open 8am to 5pm, Monday to Friday). *Important notice - please can you ensure you do not create a new application multiple times*