
The Sixteenth Amendment to the U.S. Constitution, passed by Congress on July 2, 1909, and ratified on February 3, 1913, grants Congress the power to levy and collect income taxes from any source without regard to any census or apportionment among the various states. This amendment was proposed by President William Howard Taft as a way to impose a federal income tax on corporations, and it altered Article I, Section 9 of the Constitution. The amendment's adoption ended speculation about the Court's stance on income tax, clarifying that income taxes could be levied on accessions to wealth and that Congress had the authority to label and tax items as income.
| Characteristics | Values |
|---|---|
| Date passed by Congress | July 2, 1909 |
| Date ratified | February 3, 1913 |
| Article modified | Article I, Section 9 |
| Description | 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 |
| Scope | Deals with the scope of the taxing power |
| Court rulings | Commissioner v. Glenshaw Glass Co., Pollock v. Farmers' Loan & Trust Co., and Murphy v. IRS |
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What You'll Learn

The power to tax incomes
The 16th Amendment to the U.S. Constitution, passed by Congress on July 2, 1909, and ratified on February 3, 1913, grants Congress the power to levy and collect taxes on incomes derived from any source without regard to any census or apportionment among the various states. This amendment altered Article I, Section 9 of the Constitution, which previously required direct taxes on real and personal property to be apportioned according to population.
The 16th Amendment states that "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." This amendment was proposed by Senator Nelson W. Aldrich of Rhode Island, the Senate Majority Leader and Finance Committee Chairman, as a response to the 1895 Court decision in Pollock v. Farmers' Loan & Trust Co., which held that a tax on incomes derived from property was a "direct tax" that required apportionment according to population.
The 16th Amendment removed the requirement for apportionment, allowing Congress to impose income taxes uniformly across the nation. This amendment was also significant because it provided a clear definition of "gross income," stating that income taxes could be levied on "accessions to wealth, clearly realized, and over which the taxpayers have complete dominion." This definition includes any increase in wealth, such as wages, benefits, bonuses, profits from the sale of stock or property, gambling winnings, awards, and punitive damages, unless specifically exempted by Congress.
The amendment has been interpreted by federal courts to allow a direct tax on "wages, salaries, commissions, etc. without apportionment." Additionally, it has been ruled that Congress can label something as income and tax it as long as it acts within its constitutional authority, which includes not only the 16th Amendment but also Article I, Sections 8 and 9 of the Constitution. This amendment demonstrates the government's power to tax incomes and the evolution of the legal understanding of "income" for taxation purposes.
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The amendment's ratification
The 16th Amendment to the U.S. Constitution, passed by Congress on July 2, 1909, and ratified on February 3, 1913, changed a portion of Article I, Section 9, and granted Congress the power to levy and collect income taxes from any source without the need for apportionment among the states or consideration of census data. This amendment addressed the issue of taxation authority, clarifying that Congress had the power to tax incomes directly, regardless of whether they were derived from real or personal property.
The ratification of the 16th Amendment was a direct response to the 1895 Court decision in Pollock v. Farmers' Loan & Trust Co., where the Court ruled that Congress's attempt to uniformly tax incomes across the nation was unconstitutional. The Court characterised a tax on incomes derived from property as a "direct tax," which required apportionment according to population. The 16th Amendment removed this requirement, allowing Congress to impose income taxes without regard to population distribution or the source of income.
The proposal for the 16th Amendment arose during the congressional debate over the 1909 Payne-Aldrich Tariff Act. Senator Nelson W. Aldrich of Rhode Island, the Senate Majority Leader and Finance Committee Chairman, introduced the amendment as Senate Joint Resolution No. 40. Aldrich intended to temporarily deflect progressive demands for new taxes within the tariff act. The amendment was passed by Congress on July 2, 1909, and ratified on February 3, 1913, with the necessary approval of three-fourths of the state legislatures, as required by Article V of the Constitution.
The 16th Amendment has been the subject of various court interpretations and rulings. In Commissioner v. Glenshaw Glass Co. (1955), the Supreme Court defined "gross income" under the 16th Amendment to include "accessions to wealth, clearly realised, and over which the taxpayers have complete dominion." This broad definition encompassed various forms of income, such as wages, profits from sales, and awards of punitive damages. The Court also clarified that Congress could label something as income and tax it as long as it acted within its constitutional authority, which includes not only the 16th Amendment but also Article I, Sections 8 and 9.
The 16th Amendment's impact on taxation and revenue collection in the United States was significant. It empowered Congress to impose income taxes uniformly and efficiently, contributing to the country's economic and fiscal stability.
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The scope of taxing power
The Sixteenth Amendment to the United States Constitution, passed by Congress on July 2, 1909, and ratified on February 3, 1913, grants Congress the power to levy and collect taxes on incomes derived from any source without regard to apportionment among the states or any census or enumeration. This amendment altered Article I, Section 9 of the Constitution, which previously required direct taxes on income derived from property to be apportioned according to population.
The scope of the taxing power under the Sixteenth Amendment has been the subject of debate and clarification by the courts. The amendment's wording grants Congress the ability to tax "incomes, from whatever source derived," which has been interpreted broadly. The Supreme Court, in Commissioner v. Glenshaw Glass Co. (1955), defined "gross income" as "accessions to wealth, clearly realised, and over which the taxpayers have complete dominion". This includes wages, benefits, profits from the sale of stock or property, gambling winnings, awards of punitive damages, and more, unless specifically exempted by Congress.
The Sixteenth Amendment removed the requirement for apportionment in income taxation. Apportionment is now mostly limited to taxes on real and personal property and capitation taxes. The amendment also addressed the issue of taxing incomes uniformly across the states, ensuring a consistent approach to taxation regardless of geographic differences.
While the Sixteenth Amendment expanded Congress's taxing powers, it is important to note that the source of the taxing power itself is derived from Article I, Section 8 of the Constitution. The amendment did not create the taxing power but removed barriers to its implementation, specifically regarding income taxation. This clarification is important, as it establishes that the Sixteenth Amendment did not grant new authority to tax but rather clarified and expanded the scope of existing taxing powers.
The adoption of the Sixteenth Amendment ended speculation about the Court's stance on income taxation and provided a clear framework for Congress to levy taxes on incomes without the constraints of apportionment. This amendment was a direct response to the Court's 1895 decision in Pollock v. Farmers' Loan & Trust Co., which held that a tax on incomes derived from property was a "direct tax" that required apportionment according to population. The amendment ensured that income taxation could be implemented uniformly across the nation.
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''Gross income' definition
The Sixteenth Amendment (Amendment XVI) to the United States Constitution allows Congress to levy an income tax without apportioning it among the states on the basis of population. It was passed by Congress in 1909 and ratified by the requisite number of states on February 3, 1913.
Now, gross income is the sum of all wages, salaries, profits, interest payments, rents, and other forms of earnings before any deductions or taxes. It is interchangeable with gross profit or gross margin for businesses. Gross income is not limited to cash received but includes all income realised in any form, including money, property, or services. For individuals, it is often referred to as gross pay and is the total earnings before taxes or other deductions. It includes income from all sources, not just employment.
Gross income for a company is the revenue from all sources minus the cost of goods sold. It is used to better understand the performance of specific products or services. For individuals, gross income is used by lenders or landlords to determine creditworthiness or eligibility for renting.
There are certain exclusions from gross income, such as non-taxable benefits like group health insurance and certain fringe benefits. Additionally, some income sources, like capital gains or rental payments, may be included when calculating gross income by a lender but are not included for tax purposes.
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Income tax and corporations
The Sixteenth Amendment to the U.S. Constitution, passed by Congress on July 2, 1909, and ratified on February 3, 1913, grants Congress the power to levy and collect income taxes from any source without regard to population distribution among the various states. This amendment altered Article I, Section 9 of the Constitution, which previously required direct taxes, including income taxes, to be apportioned according to each state's population.
The adoption of the Sixteenth Amendment resolved the debate over the constitutionality of income taxation. In the 1895 case of Pollock v. Farmers' Loan & Trust Co., the Supreme Court ruled that a tax on incomes derived from property was a "direct tax" that Congress could impose only by apportionment based on population. This decision created uncertainty about the legality of income taxation without apportionment. The Sixteenth Amendment removed this barrier, explicitly authorizing Congress to levy income taxes without regard to population distribution.
The amendment's impact on corporations is significant. It allows for the imposition of a corporate income tax, treating the privilege of conducting business in corporate form as an excise tax "measured by income." This amendment also addressed the issue of double taxation, where corporate profits are taxed at the corporate level and then taxed again when distributed to shareholders as dividends. By imposing an income tax at the corporate level, the amendment shifted the focus from taxing the shareholders' dividends to taxing the corporation's profits.
The Sixteenth Amendment has been interpreted by the courts to define "gross income" broadly. In Commissioner v. Glenshaw Glass Co. (1955), the Supreme Court held that income taxes could be levied on "accessions to wealth, clearly realized, and over which the taxpayers have complete dominion." This definition includes not only wages and salaries but also various forms of income, such as profits from the sale of stock or property, gambling winnings, awards, and punitive damages, unless specifically exempted by Congress.
The Sixteenth Amendment's grant of taxation power to Congress is not unlimited. It operates within the constraints of Article I, Sections 8 and 9 of the Constitution. For example, in the case of Murphy v. IRS (2008), the court ruled that while a personal injury award received by Ms. Murphy was taxable under Article I, Section 8, it was "not income within the meaning of the Sixteenth Amendment," demonstrating that the amendment's scope is interpreted in conjunction with other constitutional provisions.
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Frequently asked questions
Amendment 16 of the US Constitution, also known as the Sixteenth Amendment, grants Congress the power to levy and collect income taxes without regard to the population of each state.
The Sixteenth Amendment was proposed by Senator Nelson W. Aldrich of Rhode Island, the Senate majority leader and Finance Committee Chairman, as part of the congressional debate over the 1909 Payne–Aldrich Tariff Act. Aldrich aimed to temporarily deflect progressive calls for new taxes within the tariff act.
The Sixteenth Amendment removed the requirement for apportionment of direct taxes, which was previously mandated by Article I, Section 8, of the Constitution. This amendment expanded the scope of federal taxation to include income from any source, including wages, benefits, profits from sales, gambling winnings, and awards of punitive damages.
The amendment has been interpreted by courts to allow federal income taxation on "accessions to wealth," which includes a broad range of income sources such as wages, benefits, profits from sales, gambling winnings, and awards of punitive damages. The amendment has also been applied to tax compensatory damages for non-physical injuries, as ruled by the Court in 2007.

























