In most countries, tariffs are imposed by the national government—usually by the legislature, but often also by the executive (president/prime minister and their trade or finance ministries) using powers that the legislature has delegated to them.

Who can impose tariffs? (Core idea)

At a high level, tariffs are government measures, not something private actors can impose.

The main players are:

  • Legislature (e.g., U.S. Congress, parliaments)
    • Sets the basic tariff laws and overall tariff schedule.
    • In the U.S., the Constitution gives Congress the power to “lay and collect Taxes, Duties” and to regulate commerce with foreign nations, which covers tariffs.
  • Executive branch (President / Government / Ministries)
    • Can raise, lower, or adjust tariffs when the legislature has delegated that authority in specific laws.
    • In the U.S., Congress has passed statutes that let the President adjust tariffs under defined conditions (national security, unfair trade, import surges, emergencies, etc.).
  • Specialized trade bodies and agencies
    • Examples: trade ministries, finance ministries, customs authorities, or independent commissions.
    • They don’t usually “decide” tariffs alone, but they investigate and recommend, and then the executive formally imposes the tariff using legal powers granted by the legislature.

Example: Who can impose tariffs in the United States?

This example illustrates how power is shared and delegated.

  • Congress (original authority)
    • Article I, Section 8 of the U.S. Constitution gives Congress the power to set tariffs.
* Historically, Congress itself wrote and revised tariff rates directly.
  • President (delegated authority)
    Through various laws, Congress has allowed the President to impose or adjust tariffs in certain situations, for example:
* **Section 232 of the Trade Expansion Act of 1962** – permits tariff changes if imports threaten national security (used for steel and aluminum tariffs).

* **Section 201 of the Trade Act of 1974** – allows tariffs or safeguards when a surge of imports injures a domestic industry, after investigation by the U.S. International Trade Commission.

* **Section 301 of the Trade Act of 1974** – lets the U.S. Trade Representative, with presidential backing, impose tariffs when another country acts in an “unjustifiable” or “unreasonable” way that restricts U.S. commerce.

* **International Emergency Economic Powers Act (IEEPA)** – lets the President regulate or restrict imports during a declared national emergency.
  • Agencies involved
    • U.S. International Trade Commission (ITC) investigates injury to domestic industries.
    • Department of Commerce investigates national security impacts for Section 232.
    • Office of the U.S. Trade Representative (USTR) investigates unfair foreign practices and administers many presidential tariff actions.

In practice, this means both Congress and the President play roles: Congress sets the framework and delegates power; the President and executive agencies use that power to actually impose or adjust tariffs under specific legal provisions.

International angle: how other countries do it

Most countries follow a similar pattern, though structures differ:

  • Parliament or national legislature
    • Enacts the basic tariff law and schedule, and often approves major changes.
  • Executive / cabinet (trade, finance, or economy ministries)
    • Adjusts tariffs within limits set by law, especially for:
      • Anti-dumping measures
      • Countervailing duties (to offset foreign subsidies)
      • Safeguards (protect against sudden import surges)
  • Participation in trade agreements and the WTO
    • Countries “bind” maximum tariff levels in World Trade Organization (WTO) schedules and in free trade agreements; within those ceilings, their internal law decides who can adjust rates and when.

So globally, tariffs are imposed by national governments acting through a legal mix of legislative authority, executive discretion, and specialized trade institutions, constrained by international commitments.

Mini FAQ

  • Can a president or prime minister just slap on tariffs at will?
    Not usually. They need legal authority granted by their legislature, and they must follow the procedures and limits set in those laws.
  • Can local governments impose tariffs?
    No. Tariffs are almost always a national power, because they apply at the national border and affect foreign trade, which is a central-government function.
  • Do international organizations (like the WTO) impose tariffs?
    The WTO doesn’t impose tariffs itself. It sets rules and maximum “bound” rates; each country’s government decides the actual applied tariff within those limits.

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