Progressives supported a graduated federal income tax because the existing revenue system taxed working families most heavily while letting the era’s enormous fortunes escape almost untouched, and because a tax scaled to earnings was the only way to fund a federal government capable of regulating an industrial economy. Before 1913, roughly 90 percent of federal revenue came from excise taxes on goods like liquor, beer, wine, and tobacco, along with customs duties on imports.1U.S. Treasury Fiscal Data. Government Revenue Reformers wanted that structure replaced with rates that rose with income, and the Sixteenth Amendment, ratified in 1913, made it constitutional.2National Archives. 16th Amendment to the U.S. Constitution – Federal Income Tax (1913)
A Revenue System That Fell Hardest on Working Families
The most immediate argument for the income tax was that the existing system was upside down. Tariffs on imports and excise taxes on everyday goods like tobacco and alcohol made up nearly all federal revenue, and these indirect taxes charged everyone the same dollar amount regardless of what they earned. A factory worker who spent most of his wages on necessities paid a far larger share of his income in hidden taxes than an industrialist earning a thousand times more.
Progressives saw this as indefensible. The Populists and later the Progressives wanted a federal income tax that would fall most heavily on the enormous new fortunes of the era, rather than relying on consumption taxes that fell most heavily on ordinary people.3Constitution Center. Interpretation – The Sixteenth Amendment The Revenue Act of 1913, also known as the Underwood-Simmons Act, delivered on both sides of that trade. It cut average tariff rates from roughly 40 percent to about 27 percent and replaced the lost revenue with income tax receipts. Because the income tax only reached about 2 percent of the population, most Americans saw cheaper goods without owing anything new.
Confronting Gilded Age Wealth Concentration
The scale of inequality in the late 1800s drove much of the Progressive agenda. By 1890, the top 1 percent of Americans owned an estimated 51 percent of all wealth, while the bottom 44 percent held just 1.2 percent. Figures like John D. Rockefeller, Andrew Carnegie, and J.P. Morgan had built fortunes without historical precedent in the United States.
Reformers feared this concentration would become self-reinforcing. Large fortunes generated investment income that grew faster than wages, and wealthy families could transfer capital across generations with almost no tax friction. Without some mechanism to capture a share of those accumulating surpluses, Progressives argued, the country was building a permanent economic aristocracy, exactly the sort of entrenched class structure the American republic was supposed to reject.
A graduated rate structure answered the problem directly. Instead of taxing every dollar of income at the same rate, it applied higher rates as income rose. The 1913 version was modest: a 1 percent normal tax on income above a personal exemption of $3,000 for single filers and $4,000 for married couples, plus a graduated surtax that started at 1 percent on income above $20,000 and climbed to 6 percent on income above $500,000.4Internal Revenue Service. Personal Exemptions and Individual Income Tax Rates, 1913-2002 The combined 7 percent maximum touched only the sliver of income above $500,000 at a time when the average annual wage was well under $1,000. The principle mattered more than the rate: earning power above a certain threshold would contribute proportionally more to the public treasury.
The Ability-to-Pay Principle
Behind the political arguments sat a philosophical claim that taxation should reflect each person’s real capacity to contribute. The idea itself was not new. Adam Smith argued in 1776 that citizens should contribute “in proportion to the revenue which they respectively enjoy under the protection of the state.” Progressives pushed that logic further, defending rates that actively increased at higher income levels rather than staying flat.
The reasoning was as practical as it was moral. A dollar taxed from someone earning $800 a year might mean the difference between rent and eviction. A dollar taxed from someone earning $500,000 was imperceptible. Flat-rate taxation treated those two dollars as equivalent when their real impact on a household was nothing alike. Graduated rates acknowledged that financial sacrifice is relative, and that a fair system had to account for how much a payment actually cost the person paying it.
This represented a real shift in how Americans talked about taxes. The older tariff system carried no explicit theory of fairness; it simply taxed consumption. The graduated income tax embedded a moral claim directly into the revenue code: those who benefited most from the nation’s legal protections, infrastructure, and economic system owed more for its upkeep.
Checking Corporate and Monopoly Power
Progressives also treated the income tax as a tool for restraining corporate dominance. The trusts that controlled oil, steel, railroads, and banking had accumulated political influence to match their economic power. Without the ability to tax the income these enterprises generated, reformers argued, the federal government would remain too weak and too financially dependent on the very interests it needed to regulate.3Constitution Center. Interpretation – The Sixteenth Amendment
Corporate taxation actually began before the Sixteenth Amendment was ratified. In 1909, President Taft proposed a 1 percent excise tax on corporate net income above $5,000, structured as an indirect tax so it could survive judicial review while the constitutional amendment worked its way through the states. Taft and his Progressive allies saw the corporate tax as both a revenue measure and a regulatory device, since it forced corporations to disclose financial information to the government for the first time and made it harder for monopolies to operate in secrecy.
Once the Sixteenth Amendment removed the constitutional barrier, the income tax gave the federal government a permanent, independent revenue stream. Legislators no longer needed to court banking syndicates or rely on the goodwill of the same industrial interests they were trying to regulate. For many Progressives, that financial independence mattered as much as the revenue itself. A government funded by broad-based taxation answered to voters. A government dependent on tariffs, set through a lobbying process dominated by manufacturers, answered to industry.
Funding a Government Built for an Industrial Nation
The final practical argument was simple: the federal government needed money it could not raise under the old system. Industrialization and urbanization had created problems that demanded national responses in food and drug safety, workplace regulation, antitrust enforcement, public health, and agricultural extension services. Tariffs could not scale to meet those needs, especially while Progressives were simultaneously trying to lower them to reduce consumer costs.
The income tax resolved that contradiction. It provided a revenue source that grew naturally alongside the economy, since rising national income meant rising receipts without any change in rates. Tariff revenue, by contrast, fluctuated with trade volumes and was politically difficult to adjust. The steadier flow of income tax receipts let the government plan multi-year infrastructure projects and maintain a permanent civil service to administer new regulatory programs. Legislation like the Smith-Lever Act of 1914, which created the cooperative agricultural extension system, required sustained annual funding that excise taxes could not guarantee.
The Constitutional Fight That Made It Possible
None of this could happen without changing the Constitution first, which is why Progressives spent nearly two decades pushing for an amendment. During the Civil War, Congress had levied a 3 percent tax on incomes between $600 and $10,000 and a 5 percent tax above that to help finance the war effort.5Internal Revenue Service. Historical Highlights of the IRS That tax expired in 1872. When Congress tried again with the Wilson-Gorman Tariff of 1894, which included a 2 percent tax on individual incomes above $4,000, the Supreme Court struck it down.
In Pollock v. Farmers’ Loan & Trust Co. (1895), the Court held that taxing income derived from property amounted to a “direct tax” under the Constitution, which required such taxes to be apportioned among the states in proportion to population. No workable income tax could survive that requirement. Farmers’ organizations like the Grange and the Populist Party had been demanding a graduated income tax since the early 1890s, and the Democratic Party under William Jennings Bryan made it a recurring platform plank.2National Archives. 16th Amendment to the U.S. Constitution – Federal Income Tax (1913) Progressive Republicans joined the effort, Congress passed the amendment in 1909, and the states ratified it on February 3, 1913. Its text is direct: “The Congress shall have power to lay and collect taxes on incomes, from whatever source derived, without apportionment among the several states, and without regard to any census or enumeration.”6Legal Information Institute. 16th Amendment – U.S. Constitution With the constitutional barrier gone, the Revenue Act of 1913 turned the Progressive case for graduated taxation into federal law.