Rates are set by fiscal year, effective October 1 each year. Find current rates in the continental United States ("CONUS Rates").
A corporation is a separate legal entity, separate and apart from its owners (called shareholders or stockholders). The C and S are sections of Internal Revenue Code (Title 26 of the U.S Code) governing federal tax treatment.
A C corporation is created under state law; an S corporation is not created under state law, it is created by filing Form 2553, Election by a Small Business Corporation with the IRS to be treated under the rules of IRC subchapter S.
While a C corporation or LLC may elect to be treated an S corporation for federal tax purposes, making this election does not change the legal status of these entities. A C corporation remains subject to the corporation laws of the state of incorporation and an LLC remains subject to the LLC laws of the state of formation.
A C corporation is not a pass-through entity; it reports income and loss on Form 1120, U.S. Corporation Income Tax Return and is subject to taxes at the entity level. A C corporation does not pass losses through the entity to its shareholders.
An S corporation reports income and loss on Form 1120-S, U.S. Income Tax Return for an S Corporation. Items of income, deductions, gains, losses and credits flow through the entity to its shareholders; it does not pay taxes at the entity level (with some exceptions).
S corporation shareholders receive Schedule K-1 annually which reports their share of the entity's income, deductions, gains, losses and credits. Shareholders use K-1 as the basis for reporting their share of these items on their personal tax returns.
C corporations distribute profits to shareholders, called dividends. Undistributed C corporation profits remain in the corporation in an equity account called Retained Earnings.
A corporation must have an EIN. The IRS issues it. The number is used to identify the corporation on tax documents.
For state purposes, the corporation will need a state withholding number. Some states, such as Nevada, don't have a personal income tax. Check your state.
This is for state unemployment tax (SUTA) reporting. Generally, states, such as Arizona, assign each employer an account number.