Decide whether you want to organize as an LLC or an S corp. While both offer pass-through taxation and limited liability, as of January 2011, IRS rules do not allow partnerships, corporations or nonresident aliens to be shareholders in an S corp. Such entities can, however, own membership interests in an LLC. Furthermore, while an LLC can theoretically have an unlimited number of members, S corps are restricted to 100 shareholders. S corps, on the other hand, are easier to sell than LLCs. Some states dissolve LLCs upon the death of a member, making it impossible to leave them to your family.
Organize your LLC in compliance with state law. Although the specifics of LLC organization varies from state to state, in general you begin by selecting a name for your new entity. After ensuring that your intended name is available in your state and not in use elsewhere, prepare your articles of organization, which contain such vital information about the company as the names of its members, its principal office address, a name and address for a registered agent for service of process, and a brief description of the business purpose for which the company is being organized. File your articles with the secretary of state, secretary of corporations or a similar official in your state capitol, paying the required fee. The fee for registering a new LLC can range from less than $50 to over $500. Draft and execute an operating agreement to govern the internal operations of the company and handle issues such as adding new members, classifying membership interests and returning capital contributions upon dissolution.
Organize a corporation by first selecting a name and then drafting your articles of incorporation, sometimes called a "charter." Your articles of incorporation should contain how many shares of stock are being issued, how many classes of stock you will have -- an S corp can have only one class -- the names of the corporation's organizers and an identification of all corporate officers. Include a description of the company's business purpose. File your articles with the secretary of state or corporations in your state and pay the required fee, which is typically lower than that required for an LLC. Next, execute a shareholder agreement. In accordance with that agreement, hold an initial shareholders' meeting to elect a board of directors and CEO.