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Dollar flat as US-Iran stand-off lifts oil, yields - Finance news and analysis from Global Banking & Finance Review
Finance

Dollar flat as US-Iran stand-off lifts oil, yields

Published by Global Banking & Finance Review

Posted on September 28, 2026

4 min read

· Last updated: September 28, 2026

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Dollar Flat as Middle East Tensions Boost Oil and Treasury Yields

Market Overview and Key Drivers

By Chibuike Oguh and Samuel Indyk

NEW YORK/LONDON, Sept 28 (Reuters) - The dollar was flat against major currencies on Monday, as the continued stand-off between the US and Iran pushed oil prices higher, and as the Treasury market's sell off resumed, boosting yields.

US Treasury yields remain above 5% at multi-decade highs, but the dollar's sentiment is under pressure due to the protracted Middle East conflict, which has hampered oil-and-gas shipping through the Strait of Hormuz.

Major Currency Movements

The euro was at $1.1370, hovering near a two-month low against the dollar. Sterling was flat at $1.3250 but remained close to a three-month low of against the greenback.

Expert Insights

"What's happening is that you've got the US rejecting the Iranian offer and oil prices jumped, pushing upward pressure on US yields and that is what's lifting the dollar more broadly," said Marc Chandler, chief market strategist at Bannockburn Forex.

Oil Prices and Treasury Yields

Brent crude futures climbed nearly 1% to settle at $105.28 a barrel, after US President Donald Trump rejected a peace deal with Iran.  

Energy supply risks and robust fundamentals in the US economy have heightened inflation concerns and prompted traders to price in a more hawkish Federal Reserve, while the rise in long-end Treasury yields also supported the dollar.

The dollar index, which measures the US currency against a basket of peers, was flat at 101.20, remaining near a two-month high.

Central Bank Policy Outlook

"The market’s primary focus remains centered on oil prices, as their latest gains reflect the renewed deterioration in US/Iran negotiations and President Trump’s rejection of last week’s Iranian proposal to reopen the Strait of Hormuz. The extent and duration of the rise in energy prices is a key consideration for central bank policymakers, and driving a continued rise in tightening expectations for major developed economy central banks," said Scotiabank bank analysts led by Shaun Osborne in an investor note.

Yen Watch

US-Japan Currency Cooperation

Traders are closely following developments in the dollar-yen market after Japan's Finance Minister Satsuki Katayama and US Treasury Secretary Scott Bessent reaffirmed last week that the two countries intend to strengthen cooperation to address yen weakness.

Japan's top currency diplomat Atsushi Mimura added on Monday that markets should take at face value the "very clear" message Tokyo and Washington have about their concerns about yen weakness.

Yen Performance

Japan's yen gave up slight gains in Asia trade was flat at 157.39 per dollar.

Expert Commentary

"Japanese officials can't have it both ways: they can't have this war in Iran that is driving up oil prices and US yields and then try to cap dollar-yen. In my work, I see the dollar-yen being driven by rising US interest rates. I think that's the sort of tug of war between verbal intervention by Japanese officials claiming US support and rising US yields," Chandler said.

Data Focus

Upcoming Economic Indicators

Coming economic figures, including the PCE Index on Wednesday and nonfarm payrolls on Friday, are both expected to be consistent with further policy tightening. 

Markets are putting a 73% chance of a quarter-point rate hike from the Fed at the October meeting, according to the CME's FedWatch tool, after the central bank raised its interest rate at the September meeting. Traders are almost fully pricing in four quarter-point hikes over the next 12 months.   

Global Central Bank Moves

The Reserve Bank of Australia is also expected to raise interest rates by 25 basis points to a near 15-year high of 4.60% on Tuesday.

The Australian dollar weakened 0.11% versus the greenback to $0.7015.

The kiwi strengthened 0.16% versus the greenback to $0.5664.

China's Yuan and US-China Relations

Elsewhere, China's offshore yuan strengthened slightly to 6.713 per dollar, after Trump and Chinese President Xi Jinping's three-day summit did not yield any big public breakthroughs on a host of contentious issues.

(Reporting by Samuel Indyk and Chibuike Oguh; Editing by Jonathan Spicer )

Key Takeaways

  • US‑Iran tensions pushed Brent crude above $107–$108/barrel, lifting global oil prices and inflation concerns
  • Treasury yields remain elevated above 5%, supporting the dollar despite geopolitical risks
  • Markets price in higher odds of Fed tightening ahead of the PCE on Wednesday and non‑farm payrolls on Friday

Frequently Asked Questions

Why is the US dollar flat despite high Treasury yields?
The dollar is flat despite high Treasury yields due to ongoing US-Iran tensions raising oil prices and pressuring global market sentiment.
How does the US-Iran stand-off affect global oil prices?
The stand-off disrupts oil-and-gas shipping through the Strait of Hormuz, leading to higher oil prices.
What is driving the rise in US Treasury yields?
Increased inflation concerns, robust US fundamentals, and expectations of further rate hikes by the Federal Reserve are boosting Treasury yields.
How are other major currencies reacting to the current market situation?
The euro and sterling remain near multi-month lows, while the Japanese yen and Australian dollar show little change against the US dollar.
What economic data are traders currently focused on?
Traders are watching the upcoming PCE Index and nonfarm payrolls for signs of further policy tightening by the US Federal Reserve.

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