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Fixing errors: Enrolling workers

The NI number you’ve entered is in the wrong format. Please edit the format and try again.

You’ve entered the National Insurance (NI) number for one or more of your workers in an incorrect format. NI numbers are alpha numeric and shouldn’t include any special characters or spaces.

An example of how it should be formatted is: AA123456B.

Please refer to our Employer payroll guide (PDF) for more information on valid NI formats.