when to use abstract classes

I am trying to develop a module for a bigger application. The module and application itself is quite simple. But they want me to use abstract classes in this.Please suggest some classes that can be made abstract for this application.
The application is :
An application for the employee salary distribution system needs to be made. An initial data base of 500 employees will suffice. It should contain the first name, last name, age, employee id, department, designation, salary and duration since first joined the company


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