Trump announces 25% tariff on any country doing business with Iran

President Donald Trump used social-media posts on Jan. 12–13, 2026, to declare a sweeping new trade penalty: "Effective immediately, any Country doing business with the Islamic Republic of Iran will pay a Tariff of 25% on any and all business being done with the United States of America," he wrote, adding, "This Order is final and conclusive. Thank you for your attention to this matter!"

The announcement arrives amid the largest antigovernment protests in Iran in years, a wave of unrest that has been met with a severe government crackdown and reports of heavy casualties and widespread internet outages. U.S. officials had been briefing a range of responses to the turmoil in Tehran, from diplomatic measures to military and cyber options, and the tariff declaration amounts to an abrupt, economy‑centric escalation.

Mr. Trump's statement framed the measure as effective immediately, but the White House provided no accompanying rulemaking, implementing guidance, or statutory citation to explain how such a levy would be imposed. It remains unclear whether the 25% charge is meant to apply universally to any country flagged for trading with Iran, whether it targets specific sectors such as energy, or how the levy would interact with existing tariff schedules. The administration also did not specify whether the new charge would be layered on top of already applied tariffs for some countries.

The potential reach of the measure is broad. World Bank data show Iran exported to 147 trading partners in 2022, spanning Asia, the Middle East, and parts of Europe and Africa. Trade databases indicate China is Iran's largest partner; Chinese purchases of Iranian goods exceeded $14 billion in the year to October 2025, while other estimates put bilateral trade in recent years in the low tens of billions. Iraq was a roughly $10.5 billion market in the same window, and exports to Turkey rose from about $4.7 billion in 2024 to $7.3 billion the following year. Energy remains central: trade data suggest Chinese buyers accounted for roughly 80 percent of Iran's oil exports in the most recent year.

Economists and market participants say an across‑the‑board 25 percent tariff on any country doing business with Iran would create significant economic frictions. For major trade partners that already face U.S. tariffs, an added 25 percent levy could sharply raise the landed cost of goods in U.S. markets, feeding inflationary pressures and disrupting supply chains for components and energy. Companies with complex global supply chains would face heightened compliance burdens as customs officials attempted to trace whether goods or profits were connected to Iranian trade.

International reactions were swift. Beijing's foreign ministry publicly criticized the announcement, and Tehran said it would keep lines of communication with Washington open. Beyond diplomacy, practical obstacles abound: identifying which transactions are "doing business with" Iran, policing secondary trade flows across third countries, and adjudicating disputes would require new legal authorities or novel interpretations of existing statutes.

Complicating matters further, the U.S. Supreme Court is considering litigation that challenges the scope of presidential tariff powers from prior sweeping levies. A ruling limiting executive authority could undercut the administration's ability to implement such an expansive penalty without congressional action or new legislation.

The immediate economic effect will hinge on follow‑up: whether the administration publishes implementing rules, whether it names targeted countries, and how trading partners respond through diplomacy, reciprocal measures, or legal challenges. For markets and policymakers, the declaration raises the prospect of a rapid, trade‑driven escalation that could reshape energy flows, supply chains and the trajectory of U.S. trade policy.