The 16th Amendment Made Federal Income Tax Permanent in 1913

Federal income tax as a permanent, ongoing system began in 1913, after the 16th Amendment to the Constitution was ratified. That amendment gave Congress the power to collect income tax without apportioning it among the states based on population. Before 1913, the federal government had tried income taxes twice — during the Civil War and briefly in the 1890s — but both were struck down by courts or allowed to expire.

The 1913 tax was modest by modern standards. It applied only to the wealthiest Americans: a person earning $3,000 per year (roughly $100,000 in today's money) paid a 1 percent tax. Most working people paid nothing. The tax rate climbed steeply for higher earners, reaching 7 percent on incomes over $500,000. The government collected about $28 million that first year.

Key Takeaways

  • Federal income tax became permanent in 1913 after the 16th Amendment was ratified, allowing Congress to tax income directly.
  • The first federal income tax in 1913 applied only to wealthy Americans, with rates starting at 1 percent and reaching 7 percent on the highest incomes.
  • Two earlier attempts at federal income tax — during the Civil War (1861–1872) and in the 1890s — were either temporary or struck down by courts.
  • Income tax expanded dramatically during World War I and World War II, eventually becoming the largest source of federal revenue.

The Civil War Income Tax (1861–1872)

The first federal income tax in American history was enacted in 1861 to fund the Civil War. It started at 3 percent on incomes above $800 and was intended as a temporary war measure. The tax was progressive — higher earners paid higher rates — and it raised significant revenue for the Union Army.

This tax lasted until 1872, seven years after the war ended. Congress allowed it to expire because the country no longer needed the revenue and because many lawmakers and citizens viewed income tax as an emergency tool, not a permanent fixture. The tax was never challenged in court during this period, so its constitutionality was never tested.

The 1890s Income Tax and the Supreme Court Ruling

Congress tried again in 1894, enacting a 2 percent income tax on incomes above $4,000. This tax was meant to replace revenue lost when tariffs were lowered. However, in 1895, the Supreme Court ruled in Pollock v. Farmers' Loan & Trust Co. that the income tax was unconstitutional because it was a "direct tax" that had not been apportioned among the states according to population.

This ruling blocked any federal income tax until the Constitution itself was changed. The Court's decision meant that to collect income tax, Congress would need an amendment — a much higher bar than straightforward passing a law. For 18 years, there was no federal income tax.

The 16th Amendment and Ratification in 1913

The 16th Amendment was proposed by Congress in 1909 and ratified by the states in 1913. It reads: "The Congress shall have power to collect taxes on incomes, from whatever source derived, without apportionment among the several States." This single sentence overturned the Supreme Court's 1895 decision and gave Congress unlimited power to tax income.

Ratification was relatively swift because many states, especially those in the South and West, supported the amendment as a way to shift the tax burden away from tariffs, which they saw as favoring industrial states in the North. The amendment passed with support from both major political parties.

The First Permanent Income Tax in 1913

Within months of the 16th Amendment's ratification, Congress passed the first permanent income tax law as part of the Underwood Tariff Act. The tax began on March 1, 1913. It applied to individuals earning over $3,000 and married couples earning over $4,000 — thresholds that excluded about 95 percent of the population.

The initial rate structure was straightforward: 1 percent on income above the threshold, rising to 7 percent on income over $500,000. The tax was collected through a system of withholding and annual returns, much like today, though the process was far less automated. In that first year, only about 357,000 people filed returns.

How Income Tax Expanded After 1913

Income tax remained a tax on the wealthy through the 1920s, but World War I changed that. During the war, Congress raised rates sharply to fund military spending. The top rate climbed to 77 percent by 1918. After the war, rates fell again, but they never returned to 1913 levels.

The Great Depression and World War II transformed income tax into a mass tax. During World War II, Congress lowered the income threshold to capture middle-class workers and introduced payroll withholding — the system where your employer deducts tax from each paycheck. By the end of the war, income tax had become the largest source of federal revenue, a position it has held ever since.

Why the 16th Amendment Was Necessary

The Constitution originally required that direct taxes be apportioned among states based on population. This meant a state with 10 percent of the nation's population would pay 10 percent of any direct tax, regardless of how much income its residents actually earned. This rule made income tax impractical because wealthy states would have paid far less than their share.

The 16th Amendment removed this requirement for income taxes only, allowing Congress to tax income based on actual earnings rather than state population. This single change made the modern federal tax system possible and gave the government a reliable, growing source of revenue as the economy expanded.

Frequently Asked Questions

Did people pay federal income tax before 1913?

Yes, but only temporarily. The Civil War income tax ran from 1861 to 1872, and another income tax was collected briefly in 1894 and 1895. Both were either temporary or struck down by courts. The 1913 tax was the first permanent federal income tax.

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

The Court ruled that income tax was a direct tax that had to be apportioned among states based on population, making it impractical. The 16th Amendment overturned this ruling by exempting income tax from the apportionment requirement.

How much did people actually pay in 1913?

The tax was very light on most people because it applied only to high earners. A person earning $5,000 paid about $20 in federal income tax. Only the wealthiest Americans paid significant amounts. The average worker paid nothing.

When did income tax start affecting middle-class workers?

Income tax remained a tax on the wealthy through the 1920s and 1930s. World War II changed this. During the war, Congress lowered the income threshold and introduced payroll withholding, bringing millions of middle-class workers into the system for the first time.

Is the 16th Amendment still in effect?

Yes. The 16th Amendment remains part of the Constitution and is the legal basis for all federal income tax collected today. It has never been repealed or amended.