Subsidiaries can be formed in different ways and for various reasons. A corporation can form a subsidiary either by purchasing a controlling interest in an existing company or by creating the company itself.
Relationship between a company and its subsidiary
One disadvantage of the parent-subsidiary relationship is the possibility of multiple taxation. Another is the duty of the parent corporation to promote the subsidiary's corporate interests, to act in its best interest, and to maintain a separate corporate identity. If the parent fails to meet these requirements, the courts will perceive the subsidiary as merely a business conduit for the parent, and the two corporations will be viewed as one entity for liability purposes.