Federal income tax began in 1861 as a temporary Civil War measure

The United States first introduced a federal income tax in 1861 to fund the Civil War. It was explicitly temporary — Congress designed it to expire when the war ended. The tax applied only to high earners and took the form of a percentage of annual income above a certain threshold. By 1872, after the war concluded, Congress let the tax lapse.

This first income tax was not the permanent system you know today. It was a crisis measure, and most Americans paid nothing under it. The threshold was set high enough that only the wealthy owed anything. When it ended, the country returned to relying on tariffs and excise taxes for federal revenue.

Key Takeaways

  • The first federal income tax appeared in 1861 as a temporary Civil War funding mechanism and was repealed in 1872.
  • A second income tax was introduced in 1894 but struck down by the Supreme Court in 1895 as unconstitutional.
  • The 16th Amendment, ratified in 1913, gave Congress permanent authority to collect income tax without apportioning it among states.
  • The modern income tax system began in 1913 and has been in place continuously since then, though rates and rules have changed many times.

The 1894 income tax and why the Supreme Court rejected it

Congress tried again in 1894, passing another income tax during an economic depression. This version was broader than the Civil War tax and would have affected more people. The Supreme Court, however, ruled it unconstitutional in 1895. The Court decided that an income tax was a "direct tax" and therefore had to be apportioned among the states based on population — a requirement that made the tax impractical to administer.

This ruling left Congress unable to collect income tax for eighteen years. The government relied instead on tariffs, which created political conflict because tariffs raised prices on imported goods. By the early 1900s, there was growing pressure to find a new revenue source, particularly as government spending increased.

The 16th Amendment made permanent income tax constitutional

To overturn the Supreme Court's 1895 decision, Congress proposed the 16th Amendment in 1909. The amendment stated simply that Congress could collect income tax "without apportionment among the several States." It was ratified on February 3, 1913, giving Congress clear constitutional authority to tax income.

That same year, 1913, Congress passed the first permanent income tax under this new authority. The initial tax was modest — it applied only to people earning above $3,000 annually, which excluded most workers at the time. The top rate was 7 percent. This system has remained in place ever since, though Congress has changed rates, brackets, deductions, and rules thousands of times.

How income tax rates have changed since 1913

The income tax that began in 1913 was designed to be progressive, meaning higher earners paid a higher percentage. The top rate started at 7 percent but rose sharply during World War I, reaching 77 percent by 1918. After the war, rates fell, then rose again during the Great Depression and World War II.

The highest marginal tax rate hit 94 percent during World War II — the peak in American history. Rates fell in the 1950s and 1960s, rose again in the 1970s, then fell significantly under the 1981 and 1986 tax reforms. Since then, the top rate has moved between roughly 35 and 40 percent depending on the year. The number of tax brackets, the income thresholds for each bracket, and the types of income subject to tax have all shifted repeatedly as well.

Why income tax replaced other federal revenue sources

Before 1913, the federal government funded itself primarily through tariffs on imported goods and excise taxes on specific items like alcohol and tobacco. Tariffs were politically contentious because they raised consumer prices. As the country industrialized and the federal government's responsibilities grew — particularly after taking on new international commitments — tariff revenue alone became insufficient.

Income tax offered a way to raise large amounts of money from a broad base of earners. It also allowed the government to adjust rates without directly raising prices on goods. Over time, income tax became the largest source of federal revenue, a position it has held since the 1930s.

State income taxes came later and developed separately

State income taxes are a different story from federal income tax. Most states did not introduce income tax until the 20th century. Some states, like Pennsylvania and Maryland, had income taxes in the 1800s, but they were uncommon. After the federal government established its income tax system in 1913, states gradually adopted their own versions.

Today, 41 states and the District of Columbia collect income tax. Nine states have no income tax at all: Alaska, Florida, Nevada, South Dakota, Tennessee, Texas, Washington, Wyoming, and New Hampshire (which taxes only investment income). State income tax rates and structures vary widely and are set independently of federal rates.

Frequently Asked Questions

Did everyone have to pay income tax when it started in 1913?

No. The 1913 income tax only applied to people earning above $3,000 annually, which was roughly the top 3 percent of earners at that time. Most workers paid nothing. The tax base expanded gradually over the decades, especially during World War II, when income tax became a mass tax affecting millions of ordinary workers.

Why did the Supreme Court reject the 1894 income tax?

The Court ruled that income tax was a "direct tax" that had to be apportioned among states based on population. This requirement made the tax unworkable. The 16th Amendment, ratified in 1913, removed this restriction by giving Congress explicit power to collect income tax without apportionment.

Has the income tax rate always been the same since 1913?

No. The rate has changed hundreds of times. It started at 7 percent on the highest earners but reached 94 percent during World War II. Since then it has fluctuated between roughly 35 and 40 percent. Congress also changes the income brackets, deductions, and rules regularly.

Do all states have income tax?

No. Nine states have no income tax: Alaska, Florida, Nevada, South Dakota, Tennessee, Texas, Washington, Wyoming, and New Hampshire (which taxes investment income only). The other 41 states and D.C. collect income tax at rates they set independently of federal rates.