A sole proprietorship is an individual owner of a business (with or without employees). This type of operation is the simplest to form, and the single owner, or sole proprietor, may work as much or as little time as desired. The sole proprietor is generally held accountable for all products and/or services produced by the business, as well as debts and liabilities of the business. Since the owner’s personal liability extends well beyond amounts invested in the business or even beyond assets purchased by the business, this type of operation is considered high risk.

The amount of capital required to start a sole proprietorship is generally minimal.

In addition to sole ownership of all assets and liabilities, the proprietor benefits by receiving all profits, which in the United States are taxed as part of the owner’s total personal income. The sole proprietor may employ workers or engage independent contractors to increase skills available, but the business ceases to exist upon the owner’s death.

A sole proprietor business can be organized at any time into a different legal entity. The owner often decides to reorganize when profits substantially increase the individual's tax liability.

When two or more family members or people join together in a business operation, they may choose to establish a partnership which can take the form of a general or limited liability partnership. General partnerships are similar to the combination of a group of sole proprietorships in that the partners share workloads, profits, and liabilities. Limited Liability Partnerships, however, usually include one or more partners who manage daily operations and are generally liable for the debts of the business while other limited partners risk their investment in anticipation of profits.

Initial agreement is essential concerning how the partnership will operate, who will manage daily operations, how profits will be disbursed, and who assumes liabilities and debts. Such an agreement is normally formalized in writing and is known as a “Partnership Agreement”.

Partnerships, like sole proprietorships, are generally dissolved upon the death of a partner. Profits are shared in accordance with terms of the Partnership Agreement and reported to taxing authorities on personal tax returns of the partners.

In the United States, corporations are considered separate legal entities that are chartered and regulated by an authority in each state, such as the Secretary of State. Additionally, a separate agent who acts on behalf of the corporate entity is identified in the initial application process to receive legal notifications. Corporations must also submit identification and governing documents such as Articles of Incorporation and By-Laws. Corporate entities are generally required to be kept in active status through annual updates to a regulatory authority. As a result, this type of entity is deemed slightly more complex to form and manage.

Corporations require investment by one of more owners who are known as “shareholders” or “stockholders”, and the amount of investment varies depending on the needs of the business. Since this form of entity provides protection (widely known as the “corporate veil”) for the personal assets of owners against certain types of claims, it is generally of lower risk. Corporate entities may vary in numbers of owners from a single shareholder to an unlimited number. States and federal agencies regulate financial activities and reporting requirements that are categorized by the number of shareholders and whether their shares are available to purchase and sell on public stock exchanges. For example, US corporations with publicly traded shares are regulated by the US Securities and Exchange Commission.

The corporation may employ workers and engage independent contractors as needed to increase skills available. Corporations are required, however, to acknowledge formally (in a written document) the individuals who are approved to engage in financial transactions on behalf of the entity.

In the United States, the Internal Revenue Service regulates federal tax codes. There are two taxing options for earnings of corporations: a progressive structure on profits for the traditional corporation and another that allows owners to “flow-through” profits to their personal tax returns.

In the United States, the Limited Liability Company (LLC) is the entity of choice for the owner or owners who prefer the limited liability afforded by a corporation and a tax treatment that allows profits to flow from the business to the owner or owners. The LLC must also be registered with a State authority, but requires less documented structure. Ownership is acknowledged by percentage as opposed to number of shares and protection for the owners is similar to that of a corporation.