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Dollar edges lower as Iran sanctions, Treasury buybacks weighed - Finance news and analysis from Global Banking & Finance Review
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Dollar edges lower as Iran sanctions, Treasury buybacks weighed

Published by Global Banking & Finance Review

Posted on August 25, 2026

4 min read

· Last updated: August 25, 2026

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US Dollar Slips Amid Iran Sanctions, Treasury Moves and Trade Tensions

Market Reactions to US Dollar Developments

By Chuck Mikolajczak

Dollar Movement and Treasury Actions

NEW YORK, Aug 25 (Reuters) - The U.S. dollar was slightly lower on Tuesday, as investors weighed Washington's expanded sanctions against Iran and renewed efforts to ease pressure on longer-dated Treasury yields.

The greenback had stumbled late last week after U.S. Treasury Secretary Scott Bessent said the Treasury would double the size of quarterly repurchases of longer-dated bonds, sparking concerns that a shift to a more direct strategy to mitigate the rise in borrowing costs could lead to a debasement of the dollar.

A CNBC report on Monday that the Treasury could use part of its cash balance to buy back longer-dated bonds, along with a drop in crude oil prices, helped send yields lower Monday, a move that continued for a second day.

Expert Insights on Dollar Fundamentals

"The fundamentals seem to move against the dollar — whether it's Bessent, whether it's that the other central banks expect to raise rates more than the Fed — so the fundamentals are negative. But the dollar is overstretched, the momentum indicators are oversold for the dollar," said Marc Chandler, chief market strategist at Bannockburn Capital Markets in New York.

"So to me, that's the tension that you've got: dollar oversold technicals and bearish fundamentals."

Federal Reserve Rate Hike Expectations

Expectations for an interest rate hike by the Federal Reserve at its September meeting have also eased, pricing in a 40.1% chance for an increase of at least 25 basis points, down from about 55% a month ago, according to CME FedWatch.

Impact of Iran Sanctions

Tehran's Response and Market Effects

TEHRAN VOWS RESISTANCE TO SANCTIONS

The dollar index, which measures the greenback against a basket of currencies, edged down 0.07% to 98.92, with the euro up 0.09% at $1.1673.

The expansion of sanctions against Iran unveiled on Monday, which the country vowed to resist, was seen as short on details as it did not have any mention of major trade partners such as China. Despite holding off on the harshest penalties, Bessent warned countries to cut business ties with Tehran or risk being forced out of the dollar-based financial system.

Trade Tensions with Canada

Escalation of Tariffs

CANADA TARIFF TENSIONS ESCALATE

The Canadian dollar strengthened 0.1% versus the greenback to C$1.383 per dollar after seeing its largest drop since June 17 on Monday after trade talks between the U.S. and Canada collapsed, prompting the U.S. to slap 50% levies on some items. U.S. President Donald Trump subsequently announced on Monday that the U.S. would increase tariffs to 50% on all cars, trucks, automotive parts and steel from Canada starting January 1, 2027.

Canada's Retaliatory Measures

Canada hit back with retaliatory tariffs on about $20 billion worth of U.S. annual imports and rolled out aid for businesses and workers, matching Washington's latest duties dollar-for-dollar.

Analyst and Economist Perspectives

Analysts at Goldman Sachs said that while the escalation in trade tensions drove underperformance in the Canadian dollar to start the week, the move was relatively muted and was "likely signaling some continued expectation for an ultimate resolution" as well as the adjustments made by Canadian businesses to their supply chains over the past year.

Economists at UBS slightly cut their economic growth estimate for Canada this year to 0.9% from 1% due to the tariff escalation, but noted the negative impact could be larger.

Other Currency and Market Movements

Global Currency Shifts

The Japanese yen weakened 0.06% against the greenback to 159.22 per dollar while sterling strengthened 0.1% to $1.3644.

Cryptocurrency Market Response

Worries about the broader weakness in the dollar have been a boon to the cryptocurrency market recently, with bitcoin up 0.43% to $79,259.06 after climbing to a more than three-month high of $81,237.94.

Looking Ahead: Federal Reserve and Market Outlook

Upcoming Fed Commentary

Later in the week, market participants will look for clues on the path of interest rates when Federal Reserve Chairman Kevin Warsh speaks in Jackson Hole, Wyoming, on Friday, although several economists have expressed doubt the central bank head will offer any policy outlook.

(Reporting by Chuck Mikolajczak; additional reporting by Jiaxing Li in Hong Kong and Johann M Cherian in Bengaluru; Editing by Andrew Heavens, Nick Zieminski and Daniel Wallis)

Key Takeaways

  • U.S. Treasury Secretary Scott Bessent announced a doubling of long‑dated Treasury bond buyback operations to at least $4 billion, aiming to ease upward pressure on yields—a move that helped temper sharp rises in 30‑year rates previously hitting 19‑year highs. (www--reuters--com.flex00000.online)
  • Washington unveiled an expanded sanctions campaign targeting Iran and warning its trading partners of exclusion from the dollar‑based financial system; however, it stopped short of naming major targets, prompting Tehran to vow retaliation. (investing.com)
  • Trade tensions intensified as President Trump raised tariffs on Canadian vehicles, auto parts, and steel to 50% effective January 1, 2027; Canada retaliated with roughly C$27.6 billion in counter‑tariffs across over 700 U.S. goods, and pledged financial aid for affected businesses. (investing.com)

References

Frequently Asked Questions

Why did the US dollar edge lower?
The US dollar edged lower due to investor concerns over expanded Iran sanctions and Treasury buybacks aimed at easing pressure on bond yields.
How are US-Iran sanctions affecting currency markets?
Expanded sanctions against Iran created uncertainty for the US dollar, though specifics about partners like China were not detailed.
What impact did trade tensions with Canada have on currencies?
Trade tensions escalated with new US tariffs on Canadian goods, causing initial Canadian dollar weakness before slight recovery.
What are the expectations for the Federal Reserve's next rate decision?
Expectations for a Federal Reserve rate hike have eased, with a 40.1% probability of an increase, down from about 55% a month ago.
How has cryptocurrency reacted to dollar weakness?
Recent dollar weakness supported the cryptocurrency market, with bitcoin rising and reaching a three-month high.

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