Number of customers and market appearance: If the freelancer only works for your company and does not have a website on which their services are promoted to other customers, chances are they are actually an employee. This is the most important criterion in practice. A freelancer is already considered economically dependent if they derive at least 50% of their revenue from a single company.
Free organization of work: The freelancer determines when, how, and from where any given task is completed. If the freelancer is, however, embedded in the company's organizational structure, it is an indicator of an employment relationship.
Own tools: The freelancer provides the equipment required for the tasks and does not rely on the equipment and tools of the company.