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US Treasury to broaden scope of secondary sanctions on Iran, source says - Finance news and analysis from Global Banking & Finance Review
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US Treasury to broaden scope of secondary sanctions on Iran, source says

Published by Global Banking & Finance Review

Posted on August 24, 2026

5 min read

· Last updated: August 24, 2026

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US Treasury to Broaden Scope of Secondary Sanctions on Iran

Expansion of US Secondary Sanctions and Global Implications

By David Lawder

Overview of the Treasury's Expected Actions

WASHINGTON, Aug 24 (Reuters) - The U.S. Treasury Department is expected on Monday to broaden the scope of secondary sanctions it can impose on entities and countries that maintain business ties with Iran as the Trump administration seeks to increase economic pressure on Tehran, a source familiar with the plans told Reuters.

The action is aimed at giving a final warning to countries to sever their business ties with Iran in an effort to force an end to the nearly six-month conflict that has bottled up the Strait of Hormuz and Gulf energy exports, said the source, who spoke on condition of anonymity due to not being authorized to speak publicly about the matter.

Details of the Announcement

Treasury Secretary Scott Bessent is expected to announce more details of the Iran actions in a press conference at 1 p.m. EDT (1700 GMT). The source said Bessent also intended to provide a broader overview of an economic pressure campaign against Iran that he and President Donald Trump have described as an "economic D-Day", and would make it clear to countries that they must side with the U.S. or risk having key companies and entities cut off from the dollar-based financial system.

Bessent last week billed the action against Iran as the "toughest sanctions in history," saying that along with the U.S. naval blockade of Iranian ports, they would reduce the need for new "kinetic" military operations against Iran.

Impact of Sanctions and Ongoing Conflict

Economic and Political Effects

Trump's war in Iran, which has pushed energy prices higher worldwide, is about to hit its six-month mark. While heavy fighting has subsided, diplomatic efforts to end the war have stalled and oil and raw material shipping through the Strait of Hormuz remains blocked, keeping energy prices elevated. 

Trump's approval rating has fallen to a low point, with just ​33% of Americans in the latest Reuters/Ipsos poll approving of his performance. He says the economic costs are necessary to ensure Iran does not have a nuclear weapon.

Scope of Existing and New Sanctions

The U.S. has maintained sanctions against Iran for decades, most of which have been aimed at curtailing the country's oil revenues, aviation sector, cryptocurrency, procurement of weapons components and other military hardware, and cutting off funding for business enterprises controlled by the Islamic Revolutionary Guard Corps, a dominant force in the Iranian economy.

The sanctions bar designated entities from the dollar-based financial system, but Iran has been successful in quickly standing up new front companies, other entities and vessel registrations to evade the sanctions.

Future Expansion of Sanctions

The source familiar with Bessent's plans said the action is likely to reveal additional categories of Iran-related conduct that would be subject to secondary sanctions in the future, making it easier to take action against those facilitating the transactions on behalf of the Iranian government.

The source did not specify the activities that could be subject to sanctions, but said that for certain Iranian sectors, any activity, even in a third country, could be subject to secondary sanctions.

Current Treasury Licenses and Warnings

The Treasury currently approves licenses for transactions in a number of sectors in Iran, including for medicine and medical devices, cultural and arts exchanges and agricultural transactions.

A senior administration official said Bessent is expected to warn that any remaining financial lifelines, including through banks and third countries that have tolerated certain activity, must be shut down.

The official, who also spoke on condition of anonymity, said the Treasury has "mapped Iran's oil-smuggling and sanctions-evasion network" and will present this information to countries helping Iran evade the sanctions as a warning.

Impact on Relations with China

Sanctions on Chinese Entities

IMPACT ON RELATIONS WITH CHINA

The Treasury in recent months has sanctioned independent Chinese "teapot" refineries for purchases of Iranian oil and expanded its targeting of the shadow fleet of tankers transporting Iranian oil.

Potential Risks to US-China Relations

A much more powerful tool is the authority to sanction banks in China and other countries that are facilitating transactions with Iran, a step that the Trump administration has so far been unwilling to take amid a delicate trade truce with Beijing.

With Trump and Chinese President Xi Jinping scheduled to meet in Washington in late September, new sanctions on Chinese banks could sour prospects for extending a deal struck last November to keep Chinese rare earths flowing and cap U.S. tariffs.

Effect of Blockade on Chinese Purchases

  The U.S. blockade of Iran's ports has already curbed Chinese offers to purchase Iranian crude, Reuters reported on Friday, which may lessen the impact of secondary sanctions on China.

(Reporting by David Lawder; Additional reporting by Humeyra Pamuk; Editing by Alex Richardson, Paul Simao and Alistair Bell)

Key Takeaways

  • Treasury to broaden authority to sanction third‑party actors linked to Iran, even in third countries, signaling final warning to sever economic ties (investing.com)
  • The measure accompanies a broader campaign dubbed “economic D‑Day,” aiming for total financial isolation of Iran and coercing global alignments (washingtonpost.com)
  • This effort builds on prior Treasury actions targeting Iran’s oil, shipping, and financial networks—including shadow fleets, exchange houses, and IRGC‑linked entities (home.treasury.gov)

References

Frequently Asked Questions

What are secondary sanctions against Iran?
Secondary sanctions target foreign entities and countries that do business with Iran, aiming to isolate Iran from the dollar-based financial system.
Why is the US expanding sanctions on Iran now?
The US aims to increase economic pressure on Iran and force an end to the conflict affecting the Strait of Hormuz and global energy exports.
How will new sanctions affect foreign companies?
Foreign companies facilitating transactions with Iran risk being cut off from the US financial system and facing additional penalties.
What sectors in Iran are most affected by sanctions?
Affected sectors include oil exports, aviation, cryptocurrency, weapons procurement, and businesses connected to the Iranian Revolutionary Guard Corps.
What impact could these sanctions have on relations with China?
The US has already sanctioned some Chinese refineries and may impose penalties on Chinese banks facilitating Iranian oil transactions.

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