The federal income tax began in 1861 as a temporary war measure

The United States first imposed a federal income tax in 1861 to fund the Civil War. It was meant to be temporary — a way to raise money quickly without raising tariffs on imported goods. The tax applied only to people earning more than $800 a year, which excluded most workers at the time. It expired in 1872, a few years after the war ended.

For the next 25 years, the federal government had no income tax. It relied instead on tariffs, excise taxes, and other duties. But in 1894, Congress tried to bring back an income tax without a war to justify it. The Supreme Court struck it down in 1895, ruling that the Constitution did not allow a direct tax on income without apportioning it among the states based on population — a rule that would have made the tax unworkable.

Key Takeaways

  • The first federal income tax ran from 1861 to 1872 and taxed only the highest earners to pay for the Civil War.
  • A second attempt at income tax in 1894 was ruled unconstitutional by the Supreme Court in 1895.
  • The 16th Amendment, ratified in 1913, gave Congress the power to tax income without apportioning it among states.
  • The modern income tax system began in 1913 and has been in place ever since, though rates and rules have changed many times.

The 16th Amendment made the income tax permanent in 1913

To get around the Supreme Court's ruling, Congress proposed the 16th Amendment in 1909. It stated straightforward that Congress could collect income taxes without apportioning them among the states. The amendment was ratified on February 3, 1913, and became law when ready.

That same year, the first permanent federal income tax took effect under the Wilson administration. The initial tax rate was 1 percent on incomes over $3,000 — again, a threshold that affected only the wealthy. By 1918, during World War I, the top rate had climbed to 77 percent as the government needed more revenue. After the war, rates fell but remained high throughout the 1920s and 1930s.

Why the government needed a new source of revenue

Before the income tax, the federal government relied heavily on tariffs — taxes on imported goods. Tariffs were unpopular because they raised prices for consumers and sometimes sparked trade wars with other countries. An income tax offered an alternative that could raise large sums without disrupting trade.

The income tax also shifted the tax burden. Tariffs fell on everyone who bought imported goods, regardless of wealth. An income tax could be designed to take more from higher earners and less from lower earners. This made it politically attractive to lawmakers who wanted a tax system they could call progressive.

How income tax rates have changed since 1913

The income tax has never stayed the same for long. During World War II, rates climbed again — the top rate reached 94 percent in 1944 and 1945. After the war, rates came down but stayed well above pre-war levels. In the 1950s and 1960s, the top rate hovered around 70 percent.

The biggest shift came in 1986, when Congress passed a major tax reform that lowered the top rate from 50 percent to 28 percent. Since then, rates have moved up and down with each new administration and Congress. The number of tax brackets, the definition of what counts as income, and the deductions people can claim have all changed repeatedly.

State income taxes came later and vary widely

While the federal income tax started in 1861, state income taxes are younger. Wisconsin was the first state to impose an income tax, in 1911. Other states followed slowly — some did not adopt income taxes until the 1930s or later. Today, 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 rules differ from federal rules and from state to state. Some states tax capital gains differently than wages. Others offer credits or deductions that the federal government does not. A person's total tax burden depends on both federal and state rates, plus local taxes in some cities.

How the income tax shaped the modern economy

The income tax became the largest source of federal revenue and remains so today. It allowed the government to fund wars, build infrastructure, and expand social programs without relying on tariffs. It also created a system of tax brackets and deductions that shaped how Americans save, invest, and spend money.

The income tax also created the Internal Revenue Service (IRS), which was established in 1862 as the Bureau of Internal Revenue. The IRS collects the tax, enforces the rules, and processes millions of returns each year. The complexity of the tax code — which has grown to thousands of pages — means that many people now hire accountants or use software to file their taxes.

Frequently Asked Questions

Was there any federal tax before 1861?

Yes, but not an income tax. The federal government collected tariffs on imported goods, excise taxes on specific items like alcohol and tobacco, and other duties. These sources of revenue were enough until the Civil War created an urgent need for more money.

Why did the Supreme Court strike down the 1894 income tax?

The Court ruled that an income tax was a "direct tax" that had to be apportioned among states based on population. This would have meant that a state with 10 percent of the U.S. population would have to pay 10 percent of the total tax, regardless of how much income was earned there. The rule made the tax impractical.

Did everyone have to pay income tax starting in 1913?

No. The 1913 tax applied only to people earning more than $3,000 a year, which was roughly the top 3 percent of earners. It was not until World War II that income taxes became widespread. The government lowered the threshold to fund the war effort, and millions of ordinary workers had to file for the first time.

Can Congress change the income tax without another amendment?

Yes. The 16th Amendment gave Congress the power to tax income. Congress can change tax rates, brackets, deductions, and rules whenever it passes a new law. It does not need another amendment unless it wants to remove the income tax entirely or change the fundamental power granted by the 16th Amendment.