How American Presidents Acquired Tariff Authority
For years, critics have highlighted that the use of customs authorities can undermine the separation of powers. We heard those concerns when Trump imposed tariffs on steel and aluminum, as well as certain Chinese imports. Now, he applies various tariff rates worldwide, prompting the criticisms to resurface. The arguments remain consistent, suggesting that the president is encroaching on Congress’s role regarding taxation and trade.
However, this perspective overlooks both the constitutional framework and practical realities. The authority to impose tariffs is not a mere coincidence within the Constitution. It’s the result of a deliberate delegation of power from Congress. The legal basis is solid, the institutional reasoning compelling, and the political agreement stems from legislative inaction that has been ratified through elections.
According to Article 8, the Legislature has the power to levy taxes and obligations, which it regularly exercises concerning revenue, capital gains, and corporate profits. Yet, it hasn’t established a tariff schedule in nearly a century. Instead, Congress has developed a different legislative pathway, allowing administrative agencies to handle tariff measures under a range of flexible statutes. The distinction is clear: Congress creates tax laws, while tariff authority is granted to the president.
Delegation is Not Abdication
The actions of Congress can be inconsistent, reflecting the evolving constitutional structure. Laws such as the Trade Expansion Act of 1962 (Section 232), the Trade Act of 1974 (Section 301), and the International Emergency Economic Powers Act (1977) do not circumvent Congress—they are congressional acts that enable the president to act swiftly when national interests demand it.
This isn’t an overreach of power. It’s a functional constitutional balance, informed by legislative intent and supported by democratic norms.
When Congress set tariff rates directly in the early Republic, the economic landscape was vastly different. In the early 19th century, the U.S. mostly imported goods from a few established countries like Britain, France, and Germany, making trade policy rather straightforward. However, from the late 19th to early 20th centuries, American business relations expanded significantly. Imports came from nations with varying working conditions and trade policies, complicating tariff settings. This evolution transformed what once was a matter of simple adjustments into a complex diplomatic endeavor.
Congress could attempt to legislate these intricacies, but that would involve a cumbersome process, exposing tariffs to political maneuvering and delays. The U.S. tariff schedule now contains around 17,000 different classification codes organized across 99 chapters, ranging from raw materials to advanced technology components. Trade involves numerous countries, each with its own policies and practices, making centralized management impractical.
Instead, Congress opted for a different approach. It recognized that managing tariffs in a globalized world was no longer feasible and that administrative agencies could better respond to current threats and opportunities. Delegation here was not a retreat; it was an adaptation to increasing complexity.
This growing intricacy is constitutionally significant. If trade were simple and bilateral, Congress could manage tariffs directly. However, with the expansion of foreign trade and the globalization of supply chains, Congress has reshaped its own role. It didn’t relinquish power; it redirected it through statutory delegation, maintaining presidential flexibility in trade while focusing on internal tax matters.
Congress Did Not Abdicate, But Was Relegated
The increasing complexity of global trade has complicated tariff laws, coinciding with the shift from parliamentary tariffs to internal taxation. In the 19th century, tariffs were the primary revenue source for the federal government, but by the early 20th century, as the domestic economy matured, Congress adopted individual and corporate income taxes as its financial backbone.
This didn’t signify abdication but rather a reshaping of legislative priorities. Congress directed its focus toward the Internal Revenue Act, deeply engaging in matters such as setting interest rates and defining income. Meanwhile, tariffs were separated, delegated to the president under a broad statutory framework, allowing Congress to manage a complex internal tax system.
Requiring Congress to reclaim exclusive tariff-setting authority overlooks these constitutional developments and contradicts Congress’s own will, which has been reaffirmed through law and political practice over the years. Ironically, such moves might aim to return to an era when the U.S. had far fewer trading partners and imported far fewer goods.
Democratic Endorsement
Trump utilized tariffs during his campaigns in 2016, 2020, and 2024, achieving electoral success without Congress moving to retract these delegations. Courts have upheld this process, and the public has shown both presidential and legislative support for this framework. This isn’t a momentary shift—it represents a stable expression of democracy, formalized by law and reinforced through political practice.
The president’s customs authority isn’t a loophole or an overreach. It’s a valid expression of legislative intent adapted to contemporary trade realities and backed by broad support. Congress still holds power; it merely chooses to exercise it differently—setting tax policies while delegating customs enforcement and tariff establishment to the president, who acts within the law.
This isn’t a departure from constitutional tradition; it’s precisely that—a tradition tailored to a more complex modern world, anchored in legal governance and political legitimacy.
