President Abraham Lincoln signed the first federal income tax law on August 5, 1861 (the Revenue Act of 1861), to fund the Civil War, levying a 3% tax on incomes over $ 800 $ 8 0 0 . While this initial tax was temporary, the modern, permanent income tax was authorized by the 16th Amendment and enacted under President Woodrow Wilson in 1913.
First Federal Income Tax. On February 25, 1913, the 16th Amendment officially became part of the Constitution, granting Congress constitutional authority to levy taxes on corporate and individual income.
Following the ratification of the Sixteenth Amendment, Democratic leaders agreed to attach an income tax provision to their tariff reduction bill, partly to make up for lost revenue, and partly to shift the burden of funding the government towards the high earners that would be subject to the income tax.
Taft proposed to Congress a new income tax of 2% on corporations. This would be imposed by an excise tax on manufactured goods and an amendment to the Constitution to legally sanction the most recent federal income tax.
President Abraham Lincoln started the first U.S. income tax in 1861 to fund the Civil War, but it was temporary; the modern, permanent income tax system was established under President Woodrow Wilson with the ratification of the 16th Amendment in 1913, which gave Congress the power to levy income taxes without apportionment.
However, to help finance the First World War, Parliament introduced corporate taxes and personal income taxes. (See also Sir Robert Borden.) The 1916 Business Profits War Tax Act applied a federal tax on a percentage of business profits.
Yes, federal income tax is legally mandatory for most U.S. citizens and residents, enforced by the Internal Revenue Code (IRC), with the Supreme Court upholding its constitutionality, meaning failure to pay can lead to significant civil and criminal penalties, despite common "tax protester" arguments that the obligation is voluntary or unconstitutional. Compliance is mandatory, though the system is called "voluntary compliance" because individuals must self-report and calculate their taxes, but the requirement to do so is law.
Yes, it is illegal to intentionally not pay federal taxes, as the U.S. tax system requires compliance, and failing to pay can lead to severe civil penalties (fines, interest, wage garnishment) and criminal charges (tax evasion, imprisonment), even if the system is described as "voluntary" due to self-assessment. While simple failure to file due to oversight might result in penalties, deliberate evasion, underreporting income, or making frivolous legal arguments against paying are criminal offenses.
Before 1913, federal government revenues came mainly from taxes on goods—tariffs on imported products and excise taxes on items like whiskey. The burden of these taxes fell heavily on working Americans, who spent a much higher percentage of their income on goods than rich people did.
Public services would be cut, other taxes and levies that fall more heavily on low- and middle-income families (including sales taxes, excise taxes, fees and fines) would be increased, or — most likely — both those things would happen.
Furthermore, after the Sixteenth Amendment was ratified, the Supreme Court upheld the constitutionality of the income tax laws. Brushaber v. Union Pacific R.R., 240 U.S. 1 (1916). Since then, courts have consistently upheld the constitutionality of the federal income tax.
Unemployment compensation generally is taxable. Inheritances, gifts, cash rebates, alimony payments (for divorce decrees finalized after 2018), child support payments, most healthcare benefits, welfare payments, and money that is reimbursed from qualifying adoptions are deemed nontaxable by the IRS.
One easy way to pay no income tax is to have little or no taxable income. For tax year 2025, taxpayers receive a standard deduction of $15,750 (singles or married persons filing separately) or $31,500 (marrieds filing jointly). For heads of households, the standard deduction is $23,625 for tax year 2025.
Income tax has not always been legal in the United States, in fact for most of the United States history, income tax has had its brushes with its constitutionality. Americans, in general, have been skeptical of the taxing authority from the earliest foundations of this nation.
The financial requirements of the Civil War prompted the first American income tax in 1861. At first, Congress placed a flat 3-percent tax on all incomes over $800 and later modified this principle to include a graduated tax.
To replace what the federal income tax currently covers, tariff revenues would need to grow to nearly half of all federal revenue, or about $2.4 trillion. But Trump's increased tariffs haven't netted anything near that amount, and they aren't projected to exceed $260 billion a year as far as the eye can see.
The top individual marginal income tax rate tended to increase over time through the early 1960s, with some additional bumps during war years. The top income tax rate reached above 90% from 1944 through 1963, peaking in 1944, when top taxpayers paid an income tax rate of 94% on their taxable income.
The U.S. tax code operates on a system of voluntary compliance. Some taxpayers have used the voluntary nature of the tax system to support their claims that they don't have to pay tax at all. However, it isn't the payment of the tax itself that is voluntary.
The IRS 7-year rule primarily applies to keeping records for claiming a deduction for bad debts or losses from worthless securities, allowing a longer period to file for a credit or refund, but it's not a universal audit limit; it's often a recommended safe buffer for general record-keeping, with the standard IRS audit period usually being 3 years, extending to 6 years for substantial income omission (over 25%) or foreign income issues, and indefinitely for fraud.
Under this estimate, we assume that if income taxes were eliminated for those making up to $150,000, taxes phased back in gradually up to $200,000 of income, and the rest of the tax code were to remain unchanged then revenue would fall by roughly $10 trillion – or 2.7 percent of GDP – over a decade.
You can be charged penalties and interest on your IRS tax debt until you pay it off. The failure to pay penalty starts at 0.5% of your unpaid balance due per month (capped at 25% of the back taxes you owe). The 2025 interest rate for late payment of taxes is 7% but can change quarterly.
Who Does Not Have to Pay Taxes? You generally don't have to pay taxes if your income is less than the standard deduction or the total of your itemized deductions, if you have a certain number of dependents, if you work abroad and are below the required thresholds, or if you're a qualifying non-profit organization.