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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. Federal tax rates on corporate taxable income vary from 15% to 35%. 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. In 2014 the United States had the third highest general top marginal corporate income tax rate in the world at 39.1 percent (consisting of the 35% federal rate plus a combined state rate), exceeded only by Chad and the United Arab Emirates. However, the average corporate tax rate in 2011 dipped to 12.1%, its lowest level since before World War I, largely due to the great recession and a bonus depreciation tax break.