In Talenox, employees' salaries are auto-prorated according to the following requirements:
Setting up working days and hours per week
Setting up the correct Job Start Date and Job End Date
Setting up the correct salary increment
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In the event that you need to recalculate the proration (presumably a different type of proration calculation that your company practices), you can edit the proration of the employee by clicking on "Edit proration" under the Monthly Payment/Deductions tab shown here:
To help you understand the current proration calculation, there is a calculation formula included too.