The United States Treasury is preparing to broaden the scope of secondary sanctions it can impose on entities and countries that maintain business ties with Iran, according to a Reuters report published on August 24, 2026. Treasury Secretary Scott Bessent is expected to announce the expanded measures in the coming days, signaling a continuation of the Trump administration’s maximum pressure campaign against Tehran.
The move comes amid heightened tensions over Iran’s nuclear program and its support for regional proxies, and it marks the latest escalation in US economic pressure since the collapse of the 2015 nuclear deal in 2018. The Treasury’s Office of Foreign Assets Control (OFAC) has already designated hundreds of Iranian entities, but the new authority would allow Washington to penalize foreign firms and governments that engage in Iranian commerce even when no US financial system is involved.
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What the expanded sanctions mean
Secondary sanctions are a powerful tool because they extend US jurisdiction beyond American borders. Under current rules, OFAC can already target foreign companies that knowingly make possible significant transactions with sanctioned Iranian entities. The reported expansion would lower the threshold for triggering penalties and broaden the list of activities that could expose foreign actors to US retaliation.
According to the Reuters report, the new measures are designed to cut off revenue streams to Iran’s oil and petrochemical sectors, which remain the country’s primary sources of foreign currency. The sanctions could also target shipping companies, insurers, and financial institutions that handle Iranian trade, making it riskier for international firms to deal with Tehran.
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Analysts note that the timing is significant. Iran’s economy has shown signs of strain under existing sanctions, with inflation running at roughly 40% annually and the rial trading near record lows against the dollar. A broader sanctions regime could further isolate Iran from global markets and complicate efforts by other nations, particularly China and Russia, to maintain trade links with Tehran.
Implications for global markets and diplomacy
The announcement is likely to ripple through global energy markets. Iran exports roughly 1.5 million barrels of crude oil per day, mostly to China, and any disruption to those flows could tighten supply and push prices higher. Oil traders have already priced in some risk premium, but a formal expansion of secondary sanctions could add upward pressure on benchmarks like Brent and WTI.
Diplomatically, the move is expected to strain relations with European allies who have sought to preserve the Iran nuclear deal and maintain legitimate trade under the INSTEX mechanism. The European Union has repeatedly objected to secondary sanctions as a violation of international law, but Washington has historically shown little willingness to accommodate those concerns.
The decision also comes at a delicate moment for regional stability. Iran has been engaged in a low-level conflict with Israel and has expanded its uranium enrichment program to near weapons-grade levels, according to IAEA reports. The US Treasury’s action is widely seen as part of a broader strategy to pressure Tehran into new negotiations, though Iran has so far refused direct talks with Washington.
What to watch next
Markets and foreign governments will be watching for the specific list of entities and countries that the Treasury designates under the new authority. The implementation timeline and any waivers for humanitarian trade will also be closely scrutinized, as past sanctions regimes have included exemptions for food, medicine, and other essential goods.
For businesses with exposure to Iranian markets, the message is clear: the compliance burden is about to increase. Companies operating in the Gulf, South Asia, and East Asia will need to review their supply chains and counterparty relationships to avoid running afoul of the expanded rules.
Bessent’s announcement is expected to be followed by a detailed OFAC guidance document outlining the new authorities and compliance expectations. The Treasury has not yet confirmed a date, but the Reuters report suggests it could come as early as this week.
As with all sanctions-related developments, the situation remains fluid, and the full scope of the new measures will only become clear once the official designation list is published. Until then, market participants and foreign governments will be weighing the potential impact on trade, energy prices, and diplomatic relations with Iran.
This article is for informational purposes only and does not constitute financial advice. Sanctions and geopolitical developments are inherently volatile, and readers should consult qualified professionals before making any investment or business decisions.
