Income tax in the United States

Income tax in the United States. The system is a complex framework of levies imposed by the federal government of the United States, most states, and some local governments on the financial income of individuals, corporations, estates, and trusts. These taxes are the primary source of revenue for the federal government, funding everything from national defense to Social Security. The modern system is authorized by the Sixteenth Amendment to the United States Constitution and codified in the voluminous Internal Revenue Code, administered primarily by the Internal Revenue Service.

● History

The concept of an income tax emerged during the American Civil War with the Revenue Act of 1861 to fund the Union war effort, but it was later repealed. A significant attempt to institute a peacetime income tax was made with the Revenue Act of 1894, but it was ruled unconstitutional by the Supreme Court of the United States in Pollock v. Farmers' Loan & Trust Co.. This decision led to the ratification of the Sixteenth Amendment to the United States Constitution in 1913, which granted Congress the explicit power to levy taxes on income. The first modern return was established under the Revenue Act of 1913, signed by President Woodrow Wilson. Major overhauls have occurred through acts like the Internal Revenue Code of 1954, the Tax Reform Act of 1986 under President Ronald Reagan, and the Tax Cuts and Jobs Act of 2017 signed by President Donald Trump.

● Federal

income tax The federal income tax is imposed by the United States Department of the Treasury through the Internal Revenue Service. It applies to individuals, corporations, partnerships, and other entities. Corporate income is taxed separately from the income of shareholders under the Internal Revenue Code. Key components include the alternative minimum tax, designed to ensure high-income taxpayers pay a minimum level of tax, and the Federal Insurance Contributions Act tax, which funds Social Security and Medicare. The system is largely pay-as-you-earn, with employers withholding taxes from wages under the authority of the Internal Revenue Service.

● State and local income taxes

Most states also impose an income tax, with notable exceptions like Texas, Florida, Nevada, Washington, and Wyoming. States such as California and New York have high top marginal rates, while others like Pennsylvania use a flat tax. A few local governments, including cities like New York City and Philadelphia, levy their own income taxes. The treatment of state and local taxes for federal purposes, particularly the SALT deduction, has been a contentious political issue, notably limited by the Tax Cuts and Jobs Act of 2017.

● Taxable

income Taxable income is calculated by taking gross income—including wages, dividends, capital gains, and business income—and subtracting specific deductions and exemptions. Key exclusions from gross income include certain municipal bond interest and employer-provided health insurance contributions. Major deductions include those for mortgage interest, charitable contributions, and state and local taxes. The calculation differs for entities like corporations, which deduct business expenses to arrive at taxable income.

● Tax rates, brackets, and deductions

Federal individual income tax rates are progressive, with seven brackets established by the Internal Revenue Service. The top marginal rate has fluctuated historically, reaching over 90% during the Korean War and currently set by the Tax Cuts and Jobs Act of 2017. Taxpayers can reduce liability through standard or itemized deductions, tax credits like the Earned Income Tax Credit and Child Tax Credit, and preferential rates for long-term capital gains. Major corporate tax rates were significantly reduced by the Tax Cuts and Jobs Act of 2017.

● Filing requirements and process

Individuals and entities must file an annual tax return, such as Form 1040 for individuals or Form 1120 for corporations, with the Internal Revenue Service. The filing deadline is typically April 15, though extensions can be granted. The process involves reporting all income, calculating deductions and credits, and determining final tax liability or refund. Many taxpayers use software from companies like Intuit (TurboTax) or H&R Block, or seek assistance from CPAs and Enrolled agents.

● Tax administration and enforcement

The Internal Revenue Service, a bureau of the United States Department of the Treasury, is the primary federal agency responsible for administering and enforcing the Internal Revenue Code. Its functions include processing returns, issuing refunds, conducting audits, and pursuing collections. Enforcement actions can range from penalties and interest charges to criminal prosecution for tax evasion, as famously seen in cases against figures like Al Capone. The agency is overseen by Congress, particularly the House Ways and Means Committee and the Senate Finance Committee. Category:Taxation in the United States Category:United States federal taxation