Forming S-Corporation is not subject to corporate tax rates. Instead, an S-Corporation passes-through profit (or net losses) to shareholders. The business profits are taxed at individual tax rates on each shareholder's Form 1040. The pass-through (sometimes called flow-through) nature of the income means that the S Corporation's profits are only taxed once - at the shareholder level. The IRS explains it this way: "On their tax returns, the S corporation's shareholders include their share of the corporation's separately stated items of income, deduction, loss, and credit, and their share of non-separately stated income or loss".
S-Corporations therefore avoid the so-called "double taxation" of dividends in most states.
