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Sixteenth Amendment
Proposed on July 12, 1909.  Ratified on February 3, 1913.

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.

Order of State Ratification

 

Alabama Aug 10, 1909 Kentucky Feb 8, 1910
South Carolina Feb 19, 1910 Illinois Mar 1, 1910
Mississippi Mar 7, 1910 Oklahoma Mar 10, 1910
Maryland Apr 8, 1910 Georgia Aug 3, 1910
Texas Aug 16, 1910 Ohio Jan 19, 1911
Idaho Jan 20, 1911 Oregon Jan 23, 1911
Washington Jan 26, 1911 Montana Jan 30, 1911
Indiana Jan 30, 1911 California Jan 31, 1911
Nevada Jan 31, 1911 South Dakota Feb 3, 1911
Nebraska Feb 9, 1911 North Carolina Feb 11, 1911
Colorado Feb 15, 1911 North Dakota Feb 17, 1911
Kansas Feb 18, 1911 Michigan Feb 23, 1911
Iowa Feb 24, 1911 Missouri Mar 16, 1911
Maine Mar 31, 1911 Tennessee Apr 7, 1911
Arkansas Apr 22, 1911 Wisconsin May 26, 1911
New York Jul 12, 1911 Arizona Apr 6, 1912
Minnesota Jun 11, 1912 Louisiana Jun 28, 1912
West Virginia Jan 31, 1913 New Mexico Feb 3, 1913
Massachusetts Mar 4, 1913 New Hampshire Mar 7, 1913
Denotes last state required for ratification.

Court Cases

Cheek v. United States and the Tax Protest Movement: a Historical Reassessment of the Sixteenth Amendment

References and Articles

Taxes
Income Tax History
Uncertainties of the Income Tax
History and Purpose of the Amendment
Income Subject to Taxation
History of the Sixteenth
Some Constitutional Questions Regarding the Federal Income Tax Laws
Federal Income Tax Is Illegal
Income Tax Is `Peculiar Institution'
Why Do I Have To Pay Taxes?
Tax Man Inspires Star-Spangled Hatred