In the United States, most businesses are not C corporations. 95 percent of businesses are what are called pass-through businesses. These businesses are called pass-throughs because their income is passed directly to their owners, who then need to pay individual income taxes on it. Contrast this with C corporations that need to pay the corporate income tax on its income before it passes its earnings to its owners. Combined, pass-through businesses employ 55 percent of all private-sector workers and pay nearly 40 percent of all private-sector payroll.
Great information on small business tax burden. The characterize these businesses as pass-through businesses because their profit passes through the business directly. Article suggests that when these businesses grow they are hit hard