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National Insurance Numbers with a KC Prefix

The Department for Work and Pensions has released a small number of National Insurance Numbers with a KC prefix (e.g. KC123456B). 

Whilst these codes are valid, HRMC was not expecting them to be used and therefore neither the HMRC RTI system nor Carval Uniwage can currently validate them correctly. HMRC is working hard to resolve the issue at their end and as soon as a resolution is provided Carval will provide an update to allow the entry of KC prefixed National Insurance Numbers.  

The current work around is as follows:  

  • the National Insurance number field should be left blank
  • you should make sure the employee address field is completed in those cases
  • if you/your employee has a 'KC' National Insurance number they do not need to request a new one.

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