Taxes are imposed on net income of individuals and corporations by the federal, most state, and some local governments. Citizens and residents are taxed on worldwide income and allowed a credit for foreign taxes. Income subject to tax is determined under tax accounting rules, not financial accounting principles, and includes almost all income from whatever source. Most business expenses reduce taxable income, though limits apply to a few expenses. Individuals are permitted to reduce taxable income by personal allowances and certain nonbusiness expenses, including home mortgage interest, state and local taxes, charitable contributions, and medical and certain other expenses incurred above certain percentages of income. State rules for determining taxable income often differ from federal rules. Federal tax rates vary from 10% to 39.6% of taxable income. State and local tax rates vary widely by jurisdiction, from 0% to 13.30% of income, and many are graduated. State taxes are generally treated as a deductible expense for federal tax computation. In 2013, the top marginal income tax rate for a high-income California resident would be 52.9%.
The United States is one of two countries in the world that taxes its nonresident citizens on worldwide income, in the same manner and rates as residents; the other is Eritrea. The Supreme Court upheld the constitutionality of the payment of such tax in the case of Cook v. Tait, 265 U.S. 47 (1924).
Payroll taxes are imposed by the federal and all state governments. These include Social Security and Medicare taxes imposed on both employers and employees, at a combined rate of 15.3% (13.3% for 2011 and 2012). Social Security tax applies only to the first $106,800 of wages in 2009 through 2011. However, benefits are only accrued on the first $106,800 of wages. Employers must withhold income taxes on wages. An unemployment tax and certain other levies apply to employers. Payroll taxes have dramatically increased as a share of federal revenue since the 1950s, while corporate income taxes have fallen as a share of revenue. (Corporate profits have not fallen as a share of GDP).
Property taxes are imposed by most local governments and many special purpose authorities based on the fair market value of property. School and other authorities are often separately governed, and impose separate taxes. Property tax is generally imposed only on realty, though some jurisdictions tax some forms of business property. Property tax rules and rates vary widely with annual median rates ranging from 0.2% to 1.9% of a property's value depending on the state.
Sales taxes are imposed by most states and some localities on the price at retail sale of many goods and some services. Sales tax rates vary widely among jurisdictions, from 0% to 16%, and may vary within a jurisdiction based on the particular goods or services taxed. Sales tax is collected by the seller at the time of sale, or remitted as use tax by buyers of taxable items who did not pay sales tax.
The United States imposes tariffs or customs duties on the import of many types of goods from many jurisdictions. These tariffs or duties must be paid before the goods can be legally imported. Rates of duty vary from 0% to more than 20%, based on the particular goods and country of origin.
Estate and gift taxes are imposed by the federal and some state governments on the transfer of property inheritance, by will, or by life time donation. Similar to federal income taxes, federal estate and gift taxes are imposed on worldwide property of citizens and residents and allow a credit for foreign taxes.
Taxes may be imposed on individuals (natural persons), business entities, estates, trusts, or other forms of organization. Taxes may be based on property, income, transactions, transfers, importations of goods, business activities, or a variety of factors, and are generally imposed on the type of taxpayer for whom such tax base is relevant. Thus, property taxes tend to be imposed on property owners. In addition, certain taxes, particularly income taxes, may be imposed on the members of organizations for the organization's activities. Thus, partners are taxed on the income of their partnership.
With few exceptions, one level of government does not impose tax on another level of government or its instrumentalities.
Taxes based on income are imposed at the federal, most state, and some local levels within the United States. The tax systems within each jurisdiction may define taxable income separately. Many states refer to some extent to federal concepts for determining taxable income.
The United States federal and state income tax systems are self-assessment systems. Taxpayers must declare and pay tax without assessment by the taxing authority. Quarterly payments of tax estimated to be due are required to the extent taxes are not paid through withholdings. Employers must withhold income tax, as well as Social Security and Medicare taxes, from wages. Amounts to be withheld are computed by employers based on representations of tax status by employees on Form W-4, with limited government review.
Foreign individuals and corporations not resident in the United States are subject to federal income tax only on income from a U.S. business and certain types of income from U.S. sources. They are subject to a different transfer tax (estate and gift taxes) regime than a U.S. taxpayer, States tax individuals resident outside the state and corporations organized outside the state only on wages or business income within the state. Payers of some types of income to nonresidents must withhold federal or state income tax on the payment. Federal withholding of 30% on such income may be reduced under a tax treaty. Such treaties do not apply to state taxes.
There is no federal sales or use tax in the United States. All but five states impose sales and use taxes on retail sale, lease and rental of many goods, as well as some services. Many cities, counties, transit authorities and special purpose districts impose an additional local sales or use tax. Sales and use tax is calculated as the purchase price times the appropriate tax rate. Tax rates vary widely by jurisdiction from less than 1% to over 10%. Sales tax is collected by the seller at the time of sale. Use tax is self assessed by a buyer who has not paid sales tax on a taxable purchase.
Unlike value added tax, sales tax is imposed only once, at the retail level, on any particular goods. Nearly all jurisdictions provide numerous categories of goods and services that are exempt from sales tax, or taxed at a reduced rate. Purchase of goods for further manufacture or for resale is uniformly exempt from sales tax. Most jurisdictions exempt food sold in grocery stores, prescription medications, and many agricultural supplies. Generally cash discounts, including coupons, are not included in the price used in computing tax.
Sales taxes, including those imposed by local governments, are generally administered at the state level. States imposing sales tax require retail sellers to register with the state, collect tax from customers, file returns, and remit the tax to the state. Procedural rules vary widely. Sellers generally must collect tax from in-state purchasers unless the purchaser provides an exemption certificate. Most states allow or require electronic remittance of tax to the state. States are prohibited from requiring out of state sellers to collect tax unless the seller has some minimal connection with the state.
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