The type of business entity that you will want to set up will be explored and outlined in your business plan. However, the practical aspect of actually setting it up and making sure it's done correctly the first time is what this step is about.
"S corporations are corporations that elect to pass corporate income, losses, deductions, and credits through to their shareholders for federal tax purposes. Shareholders of S corporations report the flow-through of income and losses on their personal tax returns and are assessed tax at their individual income tax rates. This allows S corporations to avoid double taxation on the corporate income. S corporations are responsible for tax on certain built-in gains and passive income at the entity level. " - IRS.gov
"In forming a corporation, prospective shareholders exchange money, property, or both, for the corporation's capital stock. A corporation generally takes the same deductions as a sole proprietorship to figure its taxable income. A corporation can also take special deductions. For federal income tax purposes, a C corporation is recognized as a separate taxpaying entity. A corporation conducts business, realizes net income or loss, pays taxes and distributes profits to shareholders.
The profit of a corporation is taxed to the corporation when earned, and then is taxed to the shareholders when distributed as dividends. This creates a double tax. The corporation does not get a tax deduction when it distributes dividends to shareholders. Shareholders cannot deduct any loss of the corporation." - IRS.gov
"A Limited Liability Company (LLC) is a business structure allowed by state statute. Each state may use different regulations, you should check with your state if you are interested in starting a Limited Liability Company.
Owners of an LLC are called members. Most states do not restrict ownership, so members may include individuals, corporations, other LLCs and foreign entities. There is no maximum number of members. Most states also permit “single-member” LLCs, those having only one owner.
A few types of businesses generally cannot be LLCs, such as banks and insurance companies. Check your state’s requirements and the federal tax regulations for further information. There are special rules for foreign LLCs." - IRS.gov
"A partnership is the relationship between two or more people to do trade or business. Each person contributes money, property, labor or skill, and shares in the profits and losses of the business.
A partnership must file an annual information return to report the income, deductions, gains, losses, etc., from its operations, but it does not pay income tax. Instead, it "passes through" profits or losses to its partners. Each partner reports their share of the partnership's income or loss on their personal tax return. " - IRS.gov
"A sole proprietor is someone who owns an unincorporated business by himself or herself. However, if you are the sole member of a domestic limited liability company (LLC), you are not a sole proprietor if you elect to treat the LLC as a corporation." - IRS.gov