The U.S. Constitution grants Congress exclusive authority over tariffs. Article I, Section 8 explicitly empowers Congress "To lay and collect Taxes, Duties, Imposts and Excises," where tariffs—taxes on imports—fall under "Duties" and "Imposts," requiring uniformity across the United States.

Key Constitutional Text

Article I, Section 8, Clause 1 states: “The Congress shall have Power To lay and collect Taxes, Duties, Imposts and Excises, … but all Duties, Imposts and Excises shall be uniform throughout the United States.” This provision roots tariffs firmly in legislative control, distinguishing them from presidential powers.

No other articles assign tariff-setting to the executive or judiciary. Early debates during ratification emphasized Congress's role to prevent executive overreach, drawing from colonial grievances against unchecked British duties.

Historical Delegation Practices

Congress has delegated tariff flexibility to presidents via laws like the Trade Expansion Act of 1962 (Section 232 for national security) and Trade Act of 1974 (Sections 201 and 301 for industry protection or unfair practices).

  • Section 232 : Allows tariffs if imports threaten security, with no time limit.
  • Section 201 : Temporary relief (4-8 years) for import surges harming U.S. industries.
  • Section 301 : Targets discriminatory foreign practices after investigation.

These delegations spark non-delegation doctrine debates, where critics argue Congress cannot broadly transfer core powers without clear limits.

Modern Debates and Limits

Recent discussions, including under President Trump's 2025 tariffs, question if statutes like IEEPA overstep constitutional bounds via the major questions doctrine, which scrutinizes vague agency powers on economic issues.

Courts have historically upheld delegations but signal tighter review for "enormous economic consequences." Article I, Section 10, Clause 2 further bars states from imposing duties without Congress's consent, reinforcing federal legislative primacy.

**TL;DR: Tariffs are a congressional power per Article I, Section 8, with limited executive delegation via statute amid ongoing legal tensions.

Information gathered from public forums or data available on the internet and portrayed here.