
The 16th Amendment to the United States Constitution, ratified on February 3, 1913, established Congress's right to impose a federal income tax. The amendment states that Congress shall have the 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. This amendment was proposed as a way to increase funding for the federal government and shift the way it received funding. The 16th Amendment has been the subject of several court cases, with the Supreme Court providing guidance on what constitutes gross income under the amendment. The amendment's focus is not on the definition of income but rather on taxes on incomes, from whatever source derived.
| Characteristics | Values |
|---|---|
| Date proposed | July 2, 1909 |
| Date ratified | February 3, 1913 |
| Proposer | Senator Norris Brown of Nebraska |
| Purpose | To establish Congress's right to impose a federal income tax |
| Impact | Shifted the way the federal government received funding for its works |
| Scope | Applies to "gross income", including wages, benefits, bonuses, sale of stock or other property at a profit, bets won, lucky finds, awards of punitive damages in a lawsuit, and qui tam actions |
| Interpretations | The source of the taxing power is Article I, Section 8, of the Constitution; the amendment removed the barrier of having to apportion taxes based on property |
| Challenges | Focus on the definition of "income" and whether certain items should be taxed as income |
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What You'll Learn

The 16th Amendment grants Congress the authority to issue an income tax
The 16th Amendment to the U.S. Constitution, ratified on February 3, 1913, grants Congress the authority to levy and collect income taxes without the need for apportionment among the states or consideration of population. This amendment was proposed by Senator Norris Brown of Nebraska, with the accepted proposal introduced by Senator Nelson W. Aldrich. It was passed by Congress on July 2, 1909, and ratified by the required number of states, marking a significant shift in how the federal government received funding.
The official text of the 16th Amendment states: "The Congress shall have the 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." This amendment addressed the issue of taxing income, which had been a subject of debate since the Civil War. The financial demands of the Civil War prompted the first federal income tax in 1861, with Congress imposing a flat 3% tax on all incomes above $800. While this tax was repealed in 1872, the concept of income taxation persisted.
The 16th Amendment's focus is not on defining "income" but rather on granting Congress the power to tax incomes "from whatever source derived." This power to tax income is broad and not limited by narrow definitions of "income." The Supreme Court, in Commissioner v. Glenshaw Glass Co. (1955), defined "gross income" as "accessions to wealth, clearly realized, and over which the taxpayers have complete dominion." This includes various forms of income such as wages, benefits, profits from sales, and awards.
The amendment's impact was far-reaching, with social and economic consequences. It changed the way the federal government received funding and centralised power in the federal government. The amendment also had political implications, with the insurgent" Republicans supporting it to help finance the nation's growing political and military power.
While the 16th Amendment grants Congress the authority to issue an income tax, it is important to note that it did not create this power. The power to tax income existed prior to the amendment, as outlined in Article I, Section 8, and Section 9 of the Constitution. The amendment removed barriers to income taxation introduced by the Supreme Court case Pollock v. Farmers' Loan & Trust Co. (1895), which held that a tax on income derived from property was essentially a tax on that property and required apportionment.
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The Amendment's impact on the federal government's funding
The 16th Amendment to the US Constitution, ratified on February 3, 1913, grants Congress the authority to levy income tax without having to determine it based on population. This marked a significant shift in the way the federal government received its funding.
Before the 16th Amendment, the majority of federal government funding came from tariffs on domestic and international goods. The 16th Amendment now allows Congress to collect income tax "from whatever source derived", giving them a much broader tax base. This includes the power to tax wages, benefits, bonuses, sale of stock or other property at a profit, bets won, lucky finds, awards of punitive damages in a lawsuit, and more without apportionment.
The 16th Amendment was proposed and ratified during a time of high inflation and a divided Republican Party, with the support of Democrats, progressive Republicans, and other groups. Several factors, including the victory of the Democratic Party in the 1912 Presidential Election, allowed for an easier ratification phase of the new amendment. The amendment was ratified by the required thirty-six states out of the then forty-eight.
The 16th Amendment forms the basis of the federal income tax system in the US today. It is the federal government's largest source of revenue and plays a critical role in financing everything from national defense and social programs to infrastructure and education.
However, it is important to note that the 16th Amendment does not authorize state and local entities, and they may be exempt from federal taxes. Additionally, the amendment does not dictate how tax revenue is spent, as Congress must still enact laws specifying how the revenue is used, subject to constitutional limitations.
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The scope of the taxing power
The Sixteenth Amendment, ratified in 1913, played a pivotal role in the evolution of the American federal government by enabling the enactment of a modern, nationwide income tax. This amendment grants Congress the authority to impose income taxes without the need for apportionment based on population across states. The official text of the amendment states: "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."
The modern understanding of what constitutes "gross income" under the Sixteenth Amendment was defined by the Supreme Court in Commissioner v. Glenshaw Glass Co. (1955). The Court declared that income taxes could be levied on "accessions to wealth, clearly realized, and over which the taxpayers have complete dominion." This broad definition encompasses various forms of income, such as wages, benefits, profits from the sale of stock or property, awards, and punitive damages, unless specifically exempted by Congress.
The interpretation of "income" under the Sixteenth Amendment has been a subject of debate. In Eisner v. Macomber (1920), the Court struck down an unapportioned income tax on certain stock dividends, considering them as taxes on property rather than income. However, in Moore v. U.S. (2024), the Court upheld the Sixteenth Amendment's application to income received by part owners of a foreign corporation. The amendment's definition of "income" remains a topic of discussion among justices, with some arguing for a narrower interpretation limited to money or property directly received by the taxpayer.
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The definition of gross income
The 16th Amendment to the United States Constitution, passed by Congress in 1909 and ratified in 1913, established Congress's right to impose a federal income tax without apportioning it among the states on the basis of population. This amendment was proposed in response to the 1895 Supreme Court case of Pollock v. Farmers' Loan & Trust Co., where the Court declared certain taxes on incomes, such as those on property, to be unconstitutionally unapportioned direct taxes.
Now, what constitutes "gross income" under the 16th Amendment? In Commissioner v. Glenshaw Glass Co. in 1955, the Supreme Court defined gross income as "accessions to wealth, clearly realized, and over which the taxpayers have complete dominion". This means that any increase in wealth, whether through wages, benefits, bonuses, sale of stock or other property at a profit, bets won, lucky finds, awards of punitive damages in a lawsuit, or qui tam actions, is considered income unless specifically exempted by Congress. For example, Congress has made exemptions for life insurance proceeds received due to the death of the insured party, gifts, bequests, devises, inheritances, and certain scholarships.
It is important to note that the 16th Amendment does not serve as the source of the taxing power; instead, this power is derived from Article I, Section 8, of the Constitution. The amendment removed the barrier of requiring apportionment for direct taxes, which are now strictly limited to taxes on real and personal property and capitation taxes.
In summary, the 16th Amendment's definition of gross income as interpreted by the Supreme Court allows for a broad scope of taxable income, providing Congress with the authority to levy taxes on various forms of income without the constraint of apportionment among the states.
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The 16th Amendment's constitutionality and the Supreme Court
The 16th Amendment to the United States Constitution, ratified in 1913, grants Congress the authority to levy income tax without having to determine it based on population. The official text of the amendment states:
> The Congress shall have the 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.
This amendment changed a portion of Article I, Section 9 of the Constitution, which previously required direct taxes to be collected based on the population of the states. The 16th Amendment removed this requirement, allowing for a more efficient way of raising funds.
The Supreme Court has played a significant role in interpreting the 16th Amendment and defining the scope of its taxing power. In the case of Commissioner v. Glenshaw Glass Co. in 1955, the Court defined "gross income" under the 16th Amendment as including any increase in wealth, such as wages, benefits, profits from the sale of property, awards, and certain damages. This broad interpretation gave Congress significant leeway in imposing income taxes.
In more recent cases, such as Moore v. United States in 2024, the Supreme Court addressed challenges to the taxation of unrealized income. The taxpayers argued that the 16th Amendment only authorizes the taxation of realized income, such as gains from the sale of property. However, the Court's ruling emphasized that the focus of the amendment is on "taxes on incomes, from whatever source derived," rather than a narrow definition of "income" itself. This interpretation aligns with the historical context of income taxation at the time of the amendment's ratification, which included elements of unrealized gains in its scope.
The 16th Amendment's constitutionality was also challenged in the context of personal injury awards. In one case, the Court ruled that personal injury compensation could be considered "gross income" under the Internal Revenue Code and was subject to indirect taxation, even if it was not an "accession to wealth." However, in another case, the Court found that taxing a recovery for non-physical personal injury as income was unconstitutional under the 16th Amendment if it was not received in lieu of taxable income. These cases illustrate the complex nature of interpreting the 16th Amendment and the ongoing role of the Supreme Court in defining its scope and limitations.
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Frequently asked questions
The 16th Amendment to the United States Constitution, ratified on February 3, 1913, grants Congress the authority to collect income tax without determining it based on population.
The 16th Amendment changed how the federal government received funding for its works. It also shifted the focus of taxation from "income" to "taxes on incomes, from whatever source derived".
In Commissioner v. Glenshaw Glass Co. (1955), the Supreme Court ruled that income taxes could be levied on "accessions to wealth, clearly realised, and over which the taxpayers have complete dominion".
The 16th Amendment was first proposed by Senator Norris Brown of Nebraska. The final amendment proposal, Senate Joint Resolution No. 40, was introduced by Senator Nelson W. Aldrich of Rhode Island. It was passed by Congress on July 2, 1909, and ratified on February 3, 1913.
The financial requirements of the Civil War prompted the first American income tax in 1861. Congress initially placed a flat 3% tax on all incomes over $800. The 16th Amendment further developed this by granting Congress the power to impose a federal income tax.
























