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The Password for P45s is the last 4 characters of an Employee's NI number (including the letter in upper case).
E.g. A National Insurance number of AB123456B would mean a password of 456B.
If an Employee does not have a National Insurance number in Pento at the time their payslip is generated, when payroll is paid, their password will be their DOB in the following format: MMDDYY