By default, employees' NI is calculated on the basis of their basic hours.
However, if necessary, users can choose from the following options:
- Based on Salary and any special rates (this is the default for employees on a fixed schedule).
- Based on Payslip basic (this is the default for irregular/casual workers on a non-fixed schedule).
- Based on salary, excluding special rates.
This can be done by going to the Other Payroll Information in any employee's Position history.
For more information on how NI is calculated, click here.