Since the job description is not an agreement but a notice given by the employer, the employer can modify it as they see fit, as long as the tasks are still reasonably covered by the job title indicated in the labor contract, and they still do not exceed the employee’s working time. In case there are too many changes to the job description, the labor contract must be updated too.
It often happens that the tasks of an employee change gradually over time, while their job description does not get updated. In such cases, the employee mas also indicate that they want their job description updated – possibly alongside a salary raise, or even a promotion (both of which require an update to the labor contract).
If you have employees who are Hungarian residents based on their employment at your Hungarian company, such changes to the job description or the labor contract are considered small, and do not warrant a new work permit application. If you are planning a major change in their position, e.g. one that involves a change in the relevant FEOR code, the work permit must be renewed with the new FEOR code, and the employee can start working in their new position only once the new work permit has been granted.