United States Income Tax Authority

Written By Michael Tupps

Taxation, and specifically taxation of income, in the United States is based upon multiple tiers. A top-tier major component: The Constitution primarily authorizes Article I, Section 8, Clause 1 (the Taxing and Spending Clause), which grants Congress the power to lay and collect taxes, duties, imposts, and excises. This power is limited for direct taxes in Article I, Section 9, including the requirement that they be apportioned based on population. To circumvent the apportionment requirement, the 16th Amendment was ratified on February 25, 1913, authorizing the creation of the federal income tax.

Key Constitutional Text and Rules

  • Article I, Section 8, Clause 1: Empowers Congress to "lay and collect Taxes, Duties, Imposts and Excises" for federal debts and the general welfare, requiring uniformity.

  • Article I, Section 9, Clause 4: Mandates that direct taxes must be apportioned based on the census.

  • Article I, Section 9, Clause 5: Prohibits federal taxation on exports from any state.

  • Sixteenth Amendment (1913): "ARTICLE XVI. 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."

Michael Tupps
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