Corporate tax is imposed in the United States at the federal, most state, and some local levels on the income of entities treated for tax purposes as corporations. Since January 1, 2018, the effective corporate tax rate in the United States of America is a flat 21 percent due to the passage of the “Tax Cuts and Jobs Act” on December 20, 2017. State and local taxes and rules vary by jurisdiction, though many are based on federal concepts and definitions. Taxable income may differ from book income both as to timing of income and tax deductions and as to what is taxable. Corporations are also subject to a federal Alternative Minimum Tax and alternative state taxes. Like individuals, corporations must file tax returns every year. They must make quarterly estimated tax payments. Controlled groups of corporations may file a consolidated return.
Some corporate transactions are not taxable. These include most formations and some types of mergers, acquisitions, and liquidations. Shareholders of a corporation are taxed on dividends distributed by the corporation. Corporations may be subject to foreign income taxes, and may be granted a foreign tax credit for such taxes.
Shareholders of most corporations are not taxed directly on corporate income, but must pay tax on dividends paid by the corporation. However, shareholders of S corporations and mutual funds are taxed currently on corporate income, and do not pay tax on dividends.
On December 20, 2017, the US Senate and House of Representatives passed the Tax Cut and Jobs Act, setting a flat and effective corporate tax rate of 21% on all businesses that was implemented on January 1, 2018.
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