When President Trump threatens to “impose sanctions on new trade partners,” he’s primarily referring to tariffs—taxes on imported goods—rather than traditional economic sanctions. The distinction matters: tariffs are unilateral trade barriers that the President can implement under existing Trade Act authorities, while sanctions typically require Congressional approval or invocation of emergency powers. As of April 2026, Trump has shifted legal strategies after the Supreme Court blocked his attempt to use emergency powers for tariffs, now relying on Section 232 of the Trade Expansion Act of 1962 and Section 122 of the Trade Act of 1974 to impose duties on steel, aluminum, copper, pharmaceuticals, and other imports from nearly every major trading partner. Trump’s recent actions demonstrate the scale of these enforcement mechanisms. On April 8, 2026, he threatened 50% tariffs on countries supplying military weapons to Iran.
Days earlier, on April 2, he issued proclamations imposing 50% tariffs on articles made entirely or almost entirely of aluminum, steel, or copper, and announced a 100% tariff on certain pharmaceuticals and active pharmaceutical ingredients effective July 31, 2026. These aren’t idle threats—they’re backed by Treasury Department enforcement mechanisms that can result in fines, seizures, and criminal penalties for non-compliance. The economic impact on American households is substantial. The Tax Foundation estimates Trump’s tariffs will increase the average U.S. household tax burden by $1,500 in 2026, while tariff rates have risen from 2.5% in January 2025 to an estimated 27% by April 2025—the highest level in over a century. Understanding how these tariffs are enforced helps consumers and businesses understand what to expect as trade policy tightens.
Table of Contents
- What Legal Authority Does Trump Use to Impose Tariffs and Trade Barriers?
- How Are Tariffs and Trade Sanctions Actually Enforced?
- What Are “Secondary Tariffs” and How Do They Target Trade Partners Indirectly?
- How Do Companies and Importers Handle Tariff Compliance?
- What Penalties Do Violators Face, and How Serious Are They?
- What International Precedent Exists for Trade Sanctions and Their Enforcement?
- What Does This Mean for Future Trade Policy and Tariff Enforcement?
- Conclusion
What Legal Authority Does Trump Use to Impose Tariffs and Trade Barriers?
trump‘s authority to impose tariffs underwent a significant legal shift in early 2026. Initially, he attempted to use the International Emergency Economic Powers Act (IEEPA), which allows the President to declare a national emergency and impose restrictions during periods of crisis. However, on February 20, 2026, the U.S. Supreme Court ruled against this approach in *Learning Resources, Inc. v. Trump*, determining that the President cannot unilaterally use IEEPA for tariffs without Congressional involvement.
This ruling forced Trump to pivot his legal strategy. Following the Supreme Court decision, Trump shifted to Section 122 of the Trade Act of 1974, which grants the President limited authority to impose tariffs for 150 days—a window that runs until July 24, 2026. Simultaneously, he invoked Section 232 of the Trade Expansion Act of 1962, originally intended to protect national security interests in steel and aluminum production. Trump has expanded this authority well beyond its original intent, using it to justify tariffs on pharmaceuticals, semiconductors, and other goods he frames as essential to national security. Legal experts have questioned whether tariffs on pharmaceuticals or consumer goods truly qualify as “national security” concerns, but the courts have been hesitant to block these determinations once the President makes them. The limitation here is significant: Section 232’s 150-day window expires in mid-July 2026, meaning Trump’s current tariff structure may require Congressional action or new legal justifications to continue. This creates uncertainty for businesses and importers who don’t know if tariffs will remain in place, be modified, or disappear after the legal authority expires.
How Are Tariffs and Trade Sanctions Actually Enforced?
Enforcement of tariffs and trade sanctions falls primarily to the U.S. Office of Foreign Assets Control (OFAC), a division of the Treasury Department. OFAC maintains lists of restricted countries, entities, and individuals, and works with U.S. Customs and border Protection to monitor imports at ports of entry. When goods arrive at U.S. ports, they are classified by customs brokers and assessed for tariff duties. If an importer fails to pay the required tariff, the goods can be seized, the importer can be fined, and in cases of intentional evasion, criminal charges can be filed. The enforcement mechanism operates at multiple levels. At the basic level, importers must declare their goods and pay applicable tariffs before goods are released into U.S.
commerce. If tariffs aren’t paid, goods remain in Customs custody. More sophisticated enforcement involves audits and investigations. OFAC can investigate whether companies are misclassifying goods to avoid tariffs, using shell companies to circumvent sanctions, or engaging in illegal transshipment (routing goods through third countries to disguise their origin). Non-compliance can result in civil penalties, criminal prosecution, and permanent bans from importing into the United States. ComplyAdvantage, a trade compliance firm, notes that penalties for sanctions violations can reach millions of dollars and include prison time for executives involved in intentional violations. One significant limitation of current enforcement is the reliance on importers’ accurate reporting. The U.S. relies heavily on customs brokers and importers to classify goods correctly and declare their origin. While OFAC has enhanced monitoring tools and data-sharing agreements with international partners, sophisticated smuggling operations can still evade detection. Additionally, tariffs on certain goods (like pharmaceuticals or semiconductors) create perverse incentives—higher tariffs may encourage smuggling, counterfeit products, or gray-market imports that undermine safety and quality standards.
What Are “Secondary Tariffs” and How Do They Target Trade Partners Indirectly?
A tactic Trump’s administration has increasingly employed involves “secondary tariffs”—penalties on countries or entities that trade with sanctioned nations. Unlike primary tariffs that directly tax imported goods, secondary tariffs punish third-party countries for doing business with designated targets. In March 2025, Trump issued an executive order imposing 25% tariffs on nations purchasing oil from Venezuela. This creates a ripple effect: any country buying Venezuelan oil faces American tariffs on unrelated goods, pressuring them to cut ties with Venezuela or risk economic damage. Secondary tariffs are more contentious than primary tariffs because they extend U.S. economic power beyond bilateral trade relationships.
For example, if Trump designates Iran as a sanctioned partner and threatens secondary tariffs on countries supplying it with weapons (as he did on April 8, 2026, threatening 50% tariffs on such nations), he’s not just penalizing direct imports from Iran—he’s trying to isolate Iran from its allies globally. The European Union, Japan, and other major economies have criticized secondary tariffs as extraterritorial overreach, arguing that the U.S. shouldn’t dictate their foreign policy through trade penalties. The strategic problem with secondary tariffs is that they’re blunt instruments. When the U.S. imposes tariffs on countries trading with Venezuela or Iran, it often harms American allies more than the targeted regimes. The sanctioned countries often have few alternatives to their current trading partners, while allies may face severe economic consequences for compliance. This tension—between enforcement effectiveness and alliance relationships—remains unresolved in Trump’s current trade approach.
How Do Companies and Importers Handle Tariff Compliance?
For American businesses and importers, tariff compliance has become operationally complex. Large importers must forecast tariff changes, adjust supply chains, and make decisions about sourcing, production location, and pricing. Some companies have moved manufacturing to countries with lower tariff exposure (a practice called “tariff shopping”), while others are accelerating plans to produce goods domestically despite potentially higher labor and operational costs. A pharmaceutical company facing Trump’s 100% tariff on imported active pharmaceutical ingredients, for instance, might invest in domestic production even if it’s more expensive—paying a 20% tariff for companies with “approved onshoring plans” (effective September 29, 2026) may be more palatable than a 100% tariff indefinitely. The cost of compliance is significant and often invisible to consumers. Importers must hire customs brokers to navigate tariff classifications, maintain documentation to prove goods’ origin, and invest in monitoring systems to ensure compliance with evolving rules.
These costs are typically passed to consumers through higher prices. The Tax Foundation’s estimate of a $1,500 annual tax increase per household assumes that tariff costs are fully reflected in consumer prices—which generally occurs within 6-12 months of tariff implementation. A critical tradeoff is timing. Some businesses have attempted to “front-load” imports by shipping goods into the U.S. before tariff increases take effect, but this strategy only works if the timing of tariff announcements allows it. Trump’s surprise announcements and rapid implementation often leave businesses scrambling, unable to shift supply chains quickly enough to avoid new tariffs. Smaller importers and retailers, lacking the resources of multinational corporations, often absorb tariff costs or face pressure to lay off workers as margins shrink.
What Penalties Do Violators Face, and How Serious Are They?
Violations of tariff and sanctions laws carry both civil and criminal penalties. On the civil side, importers can face fines of up to 4% of the value of goods falsely classified to avoid tariffs, plus potential confiscation of merchandise. On the criminal side, individuals and corporate officers involved in intentional sanctions evasion can face felony charges, prison sentences of up to 20 years, and fines exceeding $1 million. The severity depends on the intent: accidentally misclassifying goods typically results in civil penalties and a demand for back tariffs plus interest, while intentionally smuggling sanctioned goods or using shell companies to hide origins can result in criminal prosecution. OFAC publishes enforcement actions regularly, and the penalties are substantial. In recent years, OFAC has fined financial institutions billions of dollars for violating sanctions against Iran, Russia, and North Korea.
For importers, even a single violation can damage their reputation, disqualify them from government contracts, and trigger enhanced scrutiny on all future imports. A warning often overlooked by smaller businesses: if tariffs are extremely high or suddenly implemented, black markets and smuggling can emerge. The 100% tariff on certain pharmaceuticals, for example, creates an incentive for counterfeit or diverted medicines to enter the market—a public health risk beyond simple tariff evasion. The enforcement system has improved substantially in recent years with data-sharing agreements between U.S. Customs, OFAC, and international partners. Real-time tracking of shipments, automated risk-scoring of importers, and AI-assisted classification of goods have made evasion harder—but not impossible. Sophisticated operations can still exploit gaps, particularly in countries with weak customs infrastructure or corruption.
What International Precedent Exists for Trade Sanctions and Their Enforcement?
Western nations have extensive experience enforcing trade sanctions, particularly against Russia following the 2022 invasion of Ukraine. The U.S., EU, UK, and allied nations imposed tariffs ranging from 8% to 35% on Russian goods and removed Russia’s “Most Favored Nation” (MFN) status—a designation that guarantees fair, non-discriminatory trade treatment. The loss of MFN status meant Russia faced tariffs significantly higher than other trading partners on the same goods. This coordinated international approach was more effective than unilateral sanctions would have been, as it prevented Russia from routing goods through third countries with lower tariff exposure.
However, Russia’s experience also demonstrates the limits of sanctions enforcement. Despite broad sanctions, Russia has maintained trade relationships with several countries, particularly India and China, which continue to purchase Russian oil and gas at discounted prices. Smuggling networks have helped Russia access Western technology and components despite export restrictions. This suggests that Trump’s threatened secondary tariffs on countries supplying weapons to Iran might face similar enforcement challenges—countries determined to trade with Iran may find workarounds, and the U.S. cannot force compliance without its own economic leverage or cooperation from major trading partners.
What Does This Mean for Future Trade Policy and Tariff Enforcement?
Trump’s tariff strategy is in a state of legal and political flux. The Supreme Court’s February 2026 ruling limiting IEEPA authority has forced him to rely on narrower and more temporary legal authorities. The Section 122 tariffs expire July 24, 2026, raising questions about what comes next. Will Congress formalize tariffs through legislation, will Trump again shift legal strategies, or will tariffs be scaled back? The answer will depend partly on the economic impact and political pressure over the next few months.
Looking forward, the trade enforcement landscape will likely remain contentious. Trump’s use of Section 232 to justify tariffs on pharmaceuticals and other non-traditional “national security” goods has broadened the definition of national security in ways that may have long-term effects beyond his administration. Future presidents—whether aligned with Trump’s policies or not—will inherit these expanded authorities. Meanwhile, American businesses face ongoing uncertainty about tariff levels, supply chain rules, and compliance requirements. For consumers, the visible impact will be higher prices on imported goods, from pharmaceuticals to electronics to clothing, with the Tax Foundation’s $1,500 per-household estimate reflecting that burden across 2026.
Conclusion
When Trump says he’ll impose sanctions on new trade partners, he’s wielding tariff authorities granted by trade law, though the legal foundations for many of his actions remain contested. Enforcement operates through OFAC, Customs, and Treasury Department mechanisms that can levy substantial fines, seize goods, and pursue criminal charges against violators. The economic impact—estimated at $1,500 per household annually—reflects the fact that tariffs function as a tax ultimately borne by consumers, not just importers.
The key takeaway for consumers and businesses is that tariff enforcement is real and growing more sophisticated, even as the legal authorities underlying tariffs remain in flux. As the July 2026 expiration of Section 122 tariffs approaches, expect further shifts in policy and enforcement priorities. Understanding these mechanisms helps clarify what to expect as trade policy evolves and why prices for imported goods are rising.