If you do not want users to view Payroll data in reports, you can do so via permissions by following the steps given below.

Log into Web TimeSheet with administrative privileges.
Click on Administration icon from the top menu.
Select Permission under Users/Departments.
Click on the required permission
On the Edit Permissions page, click on Reports Tab
Click the '+' sign next to Reports to expand.
Uncheck the box next to Show payroll data?.
Click on Save.