Can the President Impose Tariffs on Countries Instead of Products?

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President Donald Trump announced via social media that he would impose a 25 percent tariff on countries that trade with Iran—targeting major trading partners including China, India, the United Arab Emirates, and Turkey. Countries that together account for hundreds of billions of dollars in annual U.S. trade.

A question now sits at the center of American constitutional law: Can a president impose tariffs based on which countries other nations choose to trade with, or is the president’s power to add taxes on imports limited to protecting specific American industries from particular imported products?

Trump’s Iran tariff proposes using tariffs not as a trade remedy applied to products, but as a blanket penalty targeting entire countries based on their foreign policy choices.

Using secondary tariffs based on country conduct in this manner represents a novel application that has not been implemented at this scale before.

What Makes Country-Based Tariffs Different

This universality—the fact that it sweeps across all product categories, all industries, all supply chains—distinguishes it from even Trump’s most aggressive first-term tariff actions, which at least targeted specific sectors like steel and aluminum or specific practices like alleged intellectual property theft.

The administration announced the tariff without formal legal documentation. No executive order appeared in the Federal Register. No proclamation from the U.S. Trade Representative outlined implementation details. No regulatory guidance from the Commerce Department explained how Customs and Border Protection would enforce the measure. Only a social media post.

This procedural irregularity suggests the legal ground for such action is uncertain.

The Statutory Problem

The Constitution grants Congress exclusive power over commerce with foreign nations. Over decades, Congress has delegated certain tariff authorities to the executive branch, but always with specific conditions and procedures written into the statutes themselves.

A 1962 law lets the president impose tariffs for national security, authorizing the chief executive to impose tariffs on imports that threaten national security. A 1974 law permits tariffs in response to foreign trade practices that violate trade agreements or constitute unreasonable treatment of U.S. commerce. Both require investigation, factual findings, and determinations specifically concerning the goods or practices at issue.

The law Trump has relied on most for his tariffs—and which now faces Supreme Court review—is the International Emergency Economic Powers Act of 1977, an emergency powers law. IEEPA lets presidents act quickly during national emergencies to respond to threats to U.S. national security or foreign policy.

IEEPA doesn’t mention tariffs. The statute authorizes the president to control or block business deals involving foreign assets during declared national emergencies. Presidents have traditionally used this authority to freeze assets, block specific transactions, and prevent particular economic relationships that threaten national security.

Trump says controlling imports includes the power to tax them. Lower courts have rejected this interpretation. The Federal Circuit Court of Appeals held that IEEPA doesn’t confer authority to impose tariffs because tariffs function as a tax—a power the Constitution reserves exclusively to Congress—while IEEPA merely permits emergency regulation of transactions.

The Supreme Court heard oral arguments in November 2025 on whether IEEPA authorizes tariffs. During oral arguments, Justice Amy Coney Barrett—a Trump appointee—noted that reversing tariffs already collected and issuing refunds could become “a complete mess.” Other justices focused on the constitutional dimension: does IEEPA authorize tariffs? What prevents a president from imposing them whenever he declares a threat?

The Major Questions Doctrine

A legal rule about presidential power requires that when a president wants to make a major economic decision, Congress must clearly approve it first. Congress must explicitly say the chief executive can do this.

A 25 percent tariff on goods from all countries trading with Iran would unquestionably constitute a matter of vast economic significance. Independent Chinese refineries purchase nearly 90 percent of Iranian oil exports, and India, the UAE, and Turkey all conduct significant business with Iran while simultaneously serving as major U.S. trading partners.

The measure would potentially affect tens of billions of dollars in trade, reshape global supply chains, and impose massive costs on American consumers and businesses. Tariffs this consequential, this novel in scope, and this directly implicating Congress’s constitutional role in regulating foreign commerce cannot be justified by a vague mention of emergency powers in a 1977 statute designed for a completely different purpose. The Federal Circuit concluded this; the Supreme Court will have the final word.

Tariffs as Secondary Sanctions: A Category Collapse

For decades, the United States has maintained a clear institutional and legal separation between two domains: tariff law and sanctions law. Tariffs are trade remedies, administered by the Commerce Department and U.S. Trade Representative, applied to specific products. Sanctions are coercive measures administered by the Treasury Department office that enforces financial penalties on foreign actors, targeting specific individuals, entities, or financial flows deemed to threaten national security.

Secondary sanctions are penalties that threaten foreign companies with exclusion from U.S. markets unless they cease dealings with a designated adversary. The United States has used secondary sanctions extensively against Iran and Russia, traditionally enforced by the Treasury Department through designating foreign companies as ineligible to do business with the United States, freezing their assets, and excluding them from financial systems.

Trump’s Iran tariff proposes enforcing secondary sanctions objectives through the tariff system—imposing a uniform customs duty on all imports from any country that maintains any commercial relationship with Iran. This violates a basic rule that tariffs target products, not countries. When a president can impose tariffs on all imports from countries based on which countries they trade with, tariffs stop being tools to protect industries and become weapons the chief executive uses for foreign policy unconstrained by the procedures, standards, and congressional delegation that structure traditional tariff authority. The measure would effectively transform what should be product-based trade remedies into country-based coercive tools with vast implications for the rule of law in international commerce.

The Implementation Nightmare

Trump’s Iran tariff announcement faces severe practical implementation challenges that themselves pose legal obstacles.

The administration provided no definition of what constitutes “doing business with Iran.” Does it include only direct trade? Does it encompass indirect trade through intermediaries, such as the independent Chinese refineries that purchase nearly 90 percent of Iranian oil exports by disguising the origin to evade existing sanctions? Does it apply only to goods with Iranian content, or to all imports from the country regardless of whether any connection to Iran exists?

For a tariff to work, officials must be able to figure out which imports are subject to the duty and which are not. A country-wide tariff applied on the basis of undefined “doing business with Iran” would inevitably catch exporters with no connection to Iran whatsoever. American companies importing Korean semiconductors manufactured with no Iranian input would face the tariff simply because South Korea conducts some trade with Iran. Alternatively, applying the tariff only on a firm-specific basis—designating particular Chinese companies as ineligible because they trade with Iran—would transform the tariff into a sanctions designation regime, raising serious fairness concerns about how companies are notified and can appeal.

The Trump administration’s announcement provides no definition of “doing business with Iran,” no mechanism for determining which countries or companies are affected, no process for appealing or challenging designations, and no timeline for implementation. A challenge to these tariffs need not address the underlying foreign policy rationale or statutory authority question—it is sufficient to demonstrate that the executive has created a system for collecting taxes that has no clear rules.

The Economic Consequences

Country-based tariffs would produce severe economic consequences likely exceeding the effects of any tariff regime the United States has implemented in recent decades.

Higher prices for consumers are a major concern. Economists spent 2025 studying how the “Liberation Day” tariff package announced in April affected price levels. Initial predictions of massive inflation didn’t fully materialize, but not because tariffs had no effect. American businesses and consumers delayed purchases or switched to other countries—stockpiling imports before tariffs took effect, shifting sourcing to countries with lower tariff rates, delaying price increases amid uncertainty about whether tariffs would ultimately be sustained.

A 25 percent Iran tariff applying to all Chinese imports would exhaust these workarounds quickly. Price increases would accelerate, particularly in categories where Chinese imports dominate the supply chain and where the U.S. doesn’t make these products: consumer electronics, furniture, appliances, clothing, toys, and countless other products that American households purchase regularly.

Congress’s research office estimated that importers and the government have already paid or owed roughly $130 billion in tariff duties on imports that haven’t been fully processed yet. Country-based tariffs imposed and subsequently struck down by courts could trigger refund obligations that would be vastly larger. Treasury Secretary Bessent warned Trump that refund obligations could total $1 trillion or more if tariffs imposed under IEEPA are invalidated, creating massive refund obligations where the government would be forced to return duties on hundreds of billions of dollars of imports. The Iran tariff would add substantially to this potential liability.

The Diplomatic Fallout

Trump’s Iran tariff announcement threatens to collapse a fragile diplomatic settlement that took months to negotiate.

In October 2025, Trump and Chinese President Xi Jinping reached an agreement to reduce tariffs on bilateral trade, bringing U.S. tariffs on Chinese goods down from as high as 125 percent to 30 percent and securing certain Chinese commitments regarding purchases of U.S. agricultural products and investment in American technology sectors. This agreement represented the most significant tariff reduction the administration had announced in over a year.

The Iran tariff would undo that deal. Enforcing a 25 percent additional tariff on all Chinese imports would effectively nullify the October truce, with U.S. tariffs on Chinese goods potentially climbing back toward the punitive levels of earlier 2025. China’s Foreign Ministry responded swiftly, declaring that “there are no winners in a tariff war” and saying it will protect its own trade interests. Chinese officials have begun signaling that additional tariffs will trigger retaliatory measures, potentially triggering the kind of escalatory cycle that characterized 2025.

The implications for India are similarly serious. The U.S. already hit India with a 25 percent tariff for buying Russian oil—a secondary sanctions tariff that functions as a country-level punishment for India’s foreign policy choices. Adding another 25 percent tariff for India’s trade with Iran would impose cumulative tariff burdens on Indian exports that would make it impossible to sell profitably to the U.S. India’s basmati rice exports, pharmaceutical products, and agricultural goods would face tariff rates so high that American importers would necessarily shift sourcing to other countries or reduce purchases substantially.

The Separation of Powers Question

Whether the Constitution’s division of power between branches can allow a president who possesses the power to impose tariffs of his own design, at his own discretion, based on his own determination of what threats to national security or foreign policy require response is a fundamental constitutional problem.

The Constitution explicitly grants Congress the power to regulate foreign commerce and to set tariff rates. The Framers made this choice deliberately, understanding that trade policy represents one of the most consequential exercises of government power—affecting prices, employment, the distribution of wealth, and a nation’s relationships with foreign powers. They wanted Congress to decide, not the president.

For most of American history, presidents possessed only tariff authorities that Congress had delegated with specific conditions and procedures attached. A president had to follow specific legal steps, prove his case, and explain why the law allowed it.

The IEEPA litigation now before the Supreme Court will determine whether that constitutional structure still holds force or whether presidents have effectively acquired the power to impose tariffs whenever they deem it necessary for national security or foreign policy purposes. If the Supreme Court allows IEEPA to be used for tariffs, the chief executive could make major rules by declaring an emergency. A president could impose any tariff by declaring it necessary for national security. Congress could only stop it by passing a law with a two-thirds majority to override a veto—which is almost impossible in today’s divided Congress. Congress’s power to decide tariffs would be significantly weakened.

What Happens Next

In the immediate term, the critical question is whether the Trump administration will implement the Iran tariff as announced or whether it was mainly a threat to pressure other countries to reduce their Iran relationships. Trump has sometimes used tariff threats as negotiating tactics rather than as policies to implement, especially when courts said they might be illegal.

A Supreme Court ruling against the administration on IEEPA—a decision most legal observers expect—would prevent the Iran tariff from proceeding using that statutory basis. The administration would then face a choice: abandon the Iran tariff entirely, implement it using other authority with more explicit procedures and findings, or try a new legal argument. Abandoning the tariff after the dramatic social media announcement would signal weakness and undermine Trump’s tariff credibility. Reimplementing through other authority would require the kind of formal process and factual justification that the current announcement conspicuously lacks.

If the Iran tariff goes into effect, lawsuits would probably follow the same pattern as other tariff cases. Importers would file lawsuits in the federal court that handles trade cases challenging the tariff as illegal. The court would likely block the tariff while the case is decided, especially since importers would lose money they can’t recover if the tariff is later ruled illegal.

For American businesses and consumers, existing tariffs, court cases, and new threats have made it impossible for companies to plan. Automotive manufacturers, electronics companies, retailers, and countless other sectors that rely on imports cannot plan ahead because tariffs could change dramatically based on court rulings or presidential decisions.

The Boundaries of Presidential Power

Trump’s Iran tariff raises a basic question: how much power do presidents have over trade? The laws that might allow this were designed for different purposes and have restrictions that don’t fit country-level tariffs. The Supreme Court’s decision on IEEPA will establish boundaries for presidential tariff authority that will shape American trade policy for years to come.

The practical implementation challenges are so severe that even if legal authority technically exists, enforcing country-based tariffs would require clear rules the administration hasn’t created. The question of whether a president can impose tariffs on countries instead of products will determine not only the fate of the Iran tariff, but also the limits of presidential power over trade. American consumers, businesses, and workers will live with the consequences of that answer regardless of which way the court decides.

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