Article I, Section 8 of the Constitution gives Congress the power to "lay and collect Taxes, Duties, Imposts and Excises." This means tariffs — taxes on imported goods — require congressional authorization. The president cannot impose tariffs through executive action alone, even under emergency statutes, unless Congress explicitly delegates that specific authority.
In 2026, the Supreme Court ruled 6-3 in Learning Resources v. United States that IEEPA emergency powers did not include the authority to impose tariffs, because Congress's Article I taxing power cannot be displaced by a broad statutory reference to regulating importation. Chief Justice Roberts applied the major questions doctrine, which requires Congress to speak clearly when delegating powers of vast economic significance.
The limits of delegation are contested. Congress can authorize the president to adjust tariff rates within prescribed bounds — as it did in the Trade Act of 1974 — but cannot silently delegate the entire power to tax through open-ended emergency statutes. Courts apply heightened scrutiny when executive action affects a domain the Constitution expressly assigns to Congress.
Tariffs function as taxes on imported goods, and Americans pay them through higher prices. When the president sets tariff rates without congressional approval, consumers and businesses bear costs that no elected legislature voted on. Understanding which branch controls tariff policy tells you who to hold accountable when prices rise.
People often think the president controls trade policy and can set tariffs by executive order. In practice, the Constitution gives Congress exclusive taxing authority. Presidents can adjust tariff rates only within limits Congress specifically authorizes — they can't create new tariff programs from scratch under general emergency statutes.
Tariffs function as taxes on imported goods, and Americans pay them through higher prices. When the president sets tariff rates without congressional approval, consumers and businesses bear costs that no elected legislature voted on. Understanding which branch controls tariff policy tells you who to hold accountable when prices rise.
People often think the president controls trade policy and can set tariffs by executive order. In practice, the Constitution gives Congress exclusive taxing authority. Presidents can adjust tariff rates only within limits Congress specifically authorizes — they can't create new tariff programs from scratch under general emergency statutes.