Lost National Insurance card Number

If you have lost your national insurance (NI) number you need to contact (HMRC) HM Revenue and Customs. Either, you can complete the online form go through on the HMRC website or also call the National Insurance enquiries phone on 0300 200 3500 (this line is open 8 am to 5 pm, Monday to Friday). https://www.dnsassociates.co.uk/lost-national-insurance-number

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