Corporate Income Tax
What is Corporate Income Tax?
A corporate income tax is a tax on a company's profits, that is, on revenue minus deductible costs, rather than on its sales or its assets.
The corporate income tax applies to profit, so a firm subtracts wages, materials, interest and depreciation from revenue before the rate is applied; a firm with a loss owes nothing. Because a corporation is a legal entity rather than a person, the tax is ultimately paid by people: shareholders through lower after-tax returns, workers through lower wages, and customers through higher prices. Economists disagree about how that burden splits, and the answer depends on how mobile capital is across borders. When profits are taxed again as dividends or capital gains in shareholders' hands, the result is called double taxation. A corporate income tax is not a sales tax; it is charged on the margin between revenue and costs, not on each transaction.
Corporate Income Tax: a worked example
A firm sells $10 million of goods and reports $7 million of deductible costs, so taxable profit is $10 million − $7 million = $3 million. At an illustrative rate of 21%, the tax is 0.21 × $3 million = $630,000, leaving $2.37 million after tax. If the firm pays all of that out as dividends and shareholders face an illustrative 15% dividend rate, they owe another 0.15 × $2.37 million = $355,500, so $985,500 of the original $3 million profit goes to tax. That combined bite is the double taxation argument in numbers.
The mistake students make with corporate income tax
A common error is treating the corporate tax rate as a tax on revenue. It applies to profit after deductible costs, so a company with huge sales and thin margins can owe very little. Students also assume corporations bear the burden themselves. A corporation is a legal form, not a taxpayer with a standard of living; the money comes out of shareholders, workers or customers.
Corporate Income Tax questions
Who bears the burden of the corporate income tax?
The burden falls on people: shareholders through lower returns, workers through lower wages, and consumers through higher prices. Studies split on the shares, and the split depends on how easily capital can move to lower-tax countries. Capital that can relocate shifts more of the burden onto workers, who cannot.
What is double taxation of corporate profits?
Double taxation means the same profit is taxed once at the corporate level and again when it reaches shareholders as dividends or capital gains. Business forms that pass income straight through to owners, such as partnerships, avoid the first layer. Some countries reduce the second layer with credits or lower rates on dividends.
Why do corporate tax rates differ so much between countries?
Countries set different rates because capital is mobile and a lower rate can attract reported profits and real investment. This competition has pushed statutory rates down in many places and prompted international talks on minimum rates. What a firm actually pays also depends on deductions and credits, so effective rates differ from statutory ones.
Formula / Example
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