Step 1: Select "Employees" from the main menu. 

Step 2: Select an employee from the "All Employees" list.

Step 3: Select the "Taxes" option from "Employees" to add the "Joining Date" of an employee.

Note: "Labour Hire" based employees do not have a specific joining date. You just need to leave them as of July 1st of the current financial year.
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Step 4: Click on "Save" to update the changes.