The First Federal Income Tax Appeared During the Civil War

The United States first collected a federal income tax in 1861, during the Civil War. Congress passed it as a temporary measure to fund the war effort. The tax applied only to people earning more than $800 per year—a threshold that excluded most workers at the time. It was scheduled to expire after the war ended.

This early income tax worked differently than the system today. The government collected it through a straightforward process: tax collectors assessed what they believed a person earned, and the taxpayer could dispute the figure. There was no requirement to file a return or keep detailed records. The tax rates started low—around 3 percent on the highest earners—and increased as the war dragged on.

Key Takeaways

  • The federal income tax began in 1861 as a temporary Civil War funding measure, not a permanent system.
  • The first income tax only affected people earning more than $800 per year, leaving most workers untouched.
  • After the Civil War ended in 1865, Congress let the income tax expire, and the country returned to tariffs and excise taxes for federal revenue.
  • The income tax returned permanently in 1913 after the 16th Amendment gave Congress the power to collect it without apportioning it among states.
  • The modern income tax system with filing requirements and withholding from paychecks developed gradually through the 20th century.

Why the Income Tax Disappeared After 1865

When the Civil War ended in 1865, Congress allowed the income tax to expire as planned. The government returned to its previous revenue sources: tariffs on imported goods and excise taxes on items like alcohol and tobacco. For the next 25 years, the federal government had no income tax at all.

This gap existed because the Supreme Court had ruled in 1895 that a federal income tax was unconstitutional. The Court said the tax was a "direct tax" and therefore had to be divided among states based on population—a requirement that made the tax impractical to collect. Without a constitutional amendment, Congress could not impose an income tax on individuals.

The 16th Amendment Made the Modern Income Tax Possible

In 1913, the 16th Amendment was ratified, giving Congress the power to collect income tax without apportioning it among states. That same year, Congress passed a new income tax law as part of the Underwood Tariff Act. The tax started at 1 percent on incomes above $3,000 per year and included a 2 percent surtax on higher earners.

The 1913 income tax was still narrow in scope. It affected only about 3 percent of the population—mostly wealthy people and business owners. Most factory workers, farmers, and ordinary employees paid nothing. The government collected the tax through a straightforward return system, but enforcement was loose and many people did not file.

How World War I Expanded the Income Tax

When the United States entered World War I in 1917, Congress dramatically expanded the income tax to fund the war. Tax rates jumped from 1 percent to as high as 77 percent on the wealthiest earners. The income threshold dropped, bringing millions of middle-class workers into the tax system for the first time.

The government also introduced withholding during World War I—the system where employers deduct taxes from paychecks before workers receive them. This made collection faster and more reliable than waiting for people to file returns at the end of the year. Withholding remained after the war ended and became a permanent part of the tax system.

The Income Tax Became Permanent After World War I

Unlike the Civil War income tax, the tax introduced in 1913 never expired. Even after World War I ended in 1918, Congress kept the income tax in place. Tax rates fell from their wartime peaks, but the system remained. By the 1920s, the income tax had become the federal government's largest source of revenue.

The Depression and World War II further expanded the income tax system. By the 1940s, withholding was standard, filing requirements were clear, and the tax reached ordinary workers earning modest wages. The income tax had transformed from a temporary war measure into the foundation of federal revenue—a role it still holds today.

Why the Income Tax Started So Late in American History

The United States operated without a federal income tax for most of its first century. The Constitution allowed Congress to collect taxes, but the Founders designed the federal government to rely on tariffs and excise taxes instead. Income taxes were seen as intrusive and difficult to collect fairly without modern record-keeping and communication.

The Civil War forced a change in thinking. The government needed money urgently and could not raise enough through tariffs alone. The income tax proved workable, even if imperfect. After the war, the country returned to tariffs because they seemed simpler and less invasive. It took another war—World War I—and the constitutional amendment that followed the 1895 court ruling to make the income tax permanent.

How the Income Tax System Changed Over Time

The income tax that started in 1913 looked nothing like the system today. Early taxpayers filed straightforward one-page returns. There were no standard deductions, no child tax credits, and no earned income tax credit. Employers did not withhold taxes automatically—workers paid in lump sums, usually once a year.

The system grew more complex through the 20th century as Congress added deductions, credits, and special rules for different types of income. Withholding became automatic in the 1940s. The IRS (Internal Revenue Service) developed into a large agency with power to audit returns and enforce collection. By the 1950s, the income tax had become the detailed, mandatory system that most workers know today.

Frequently Asked Questions

Did people have to file income tax returns in 1861?

No. The Civil War income tax was assessed by government officials based on their estimate of what a person earned. Taxpayers could dispute the amount, but there was no requirement to file a return or submit proof of income. The modern filing system did not exist until 1913.

Why did the income tax disappear after the Civil War?

Congress allowed it to expire because it was always meant to be temporary. The government returned to tariffs and excise taxes for revenue. Additionally, the Supreme Court ruled in 1895 that an income tax was unconstitutional without an amendment, which discouraged Congress from trying to reinstate it.

What was the income threshold for the first income tax in 1913?

The first federal income tax in 1913 applied to people earning more than $3,000 per year. This was roughly equivalent to $100,000 in today's money, so it affected only wealthy people and business owners. Most workers earned far less and paid no income tax.

When did employers start withholding taxes from paychecks?

Withholding began during World War I, around 1917, as a way to collect taxes faster and more reliably. It remained after the war and became a permanent feature of the tax system. By the 1940s, withholding was standard practice for most employees.

Is the income tax still considered temporary?

No. Although it started as a temporary Civil War measure, the income tax has been permanent since 1913. Congress has renewed and expanded it many times, and it is now the largest source of federal revenue. There is no expiration date.