Much of business law addresses the different types of business organizations. There are laws regarding how to properly form and run each type. This includes laws about entities such as corporations, partnerships and limited liability companies. For example, let's say I decide to start my own pet grooming business. I need to decide what type of business I want to be. Will this be a partnership? Will it be a sole proprietorship? What papers do I need to file in order to start this business? These questions fall under the laws that govern business entities, which are state laws. The type of entity I pick will also affect how I pay my federal income taxes. These, of course, are federal laws.