The effective corporate income tax rate is almost exactly the same in the United States as in other OECD countries. (While the U.S. statutory corporate tax rate is well above the OECD average, the many loopholes in the U.S. corporate tax bring the effective rate down substantially.) Then how is it that corporate taxes account for a much smaller share of GDP in the United States than in other high-income countries? The answer lies in forms of incorporation that allow U.S. corporate profits to be taxed at the lower individual income tax rate.John Miller
Two changes paved the way for more and more profit to escape the corporate income tax in the United States. The federal government extended limited legal liability, which protects owners from losing their personal assets if their business fails, to some partnerships and “pass through” corporations not subject to the corporate income tax. Then the tax reform of 1986 cut the top tax bracket of the individual income tax to 28%, well below the statutory corporate income-tax rate. That opened up a large tax advantage for owners who paid individual income taxes on their profits instead of corporate income taxes.
Pass-through businesses—-S-corporations (which afford up to 100 owners limited liability), partnerships (including limited liability partnerships in which all the partners enjoy limited liability), and sole proprietorships—-have flourished over the last three decades. In 1980, corporations subject to the corporate income tax (called “C-corporations”) generated nearly four fifths (78%) of business net income, a measure of a business’s profitability. By 2007, pass-through businesses’ share of net income surpassed that of C-corporations. In fact, partnerships, S-corporations, and sole proprietorships each outnumbered C-corporations.