Sixteenth Amendment - Income Tax
Original Text
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.
In Plain Language
The Sixteenth Amendment removed a specific obstacle to federal income taxes—the constitutional requirement that direct taxes be apportioned among states proportional to population. It didn't grant Congress a brand-new or otherwise unlimited taxing power.
Congress already had broad taxing authority under Article I. The problem was Pollock v. Farmers' Loan & Trust Co. (1895), which ruled that a federal tax on income derived from property was a "direct tax" requiring apportionment by state population—making a national income tax impractical. The Sixteenth Amendment overturned Pollock: Congress can now tax incomes "from whatever source derived" without apportionment.
That is the change the amendment made—removing the apportionment obstacle for income taxes—not the creation of an otherwise unlimited new taxing authority. Income taxes still must comply with all other constitutional requirements, including uniformity rules and the limits of congressional power generally.
Historical Significance
Congress can tax income without apportioning it among states by population. This overturned Pollock v. Farmers' Loan & Trust Co. (1895), where the Supreme Court struck down the 1894 income tax. Ratified February 3, 1913.
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Historical Context
The Constitution's requirement that direct taxes be apportioned among states by population made a national income tax impractical. A state with 1% of the U.S. population would owe exactly 1% of any direct tax levy, regardless of its residents' incomes. Congress had imposed income taxes during the Civil War under different constitutional reasoning, but their peacetime authority was unsettled.
In Pollock v. Farmers' Loan & Trust Co. (1895), the Supreme Court struck down a 2% income tax on earnings above $4,000, ruling that a tax on income derived from property—rents, dividends, and interest—was a direct tax requiring apportionment. The 5-4 decision outraged progressives who saw income taxes as fairer than tariffs and excise taxes that fell disproportionately on working-class consumers.
The Sixteenth Amendment, ratified February 3, 1913, overturned Pollock by permitting Congress to tax incomes "from whatever source derived, without apportionment among the several States." The amendment removed the apportionment obstacle—it didn't transform Article I's taxing power into something new. Every court to consider "tax protester" claims that the amendment somehow doesn't cover wages has rejected those arguments as frivolous, and the IRS imposes a $5,000 penalty on returns that raise them.
How This Shows Up Today
The income tax generates roughly $2.5 trillion in individual income taxes annually, making it the federal government's primary revenue source. The IRS collected $5.1 trillion total in fiscal year 2024. Every debate over tax rates, brackets, deductions, and loopholes operates within the Sixteenth Amendment's framework. "Tax protesters" continue to claim the amendment was never properly ratified or doesn't authorize taxes on wages. Federal courts have rejected these arguments in every case—they aren't close questions.
Federal income tax system
IRS enforcement authority
Tax policy debates
Discussion Questions4
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