Currencies September 29, 2026 04:50 AM

Sterling Softens as Oil-Led Dollar Demand Strengthens

Brent’s rise amid stalled U.S.-Iran talks keeps upward pressure on the dollar, weighing on the pound and euro

By Leila Farooq
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The pound and the euro weakened on Tuesday as stalled U.S.-Iran negotiations pushed Brent crude toward $107 a barrel, reinforcing demand for the dollar. GBP/USD and EUR/USD slipped in early trading, while market pricing of Fed and ECB moves, UK retail inflation data and elevated swap spreads added nuance to the outlook for currencies and risk assets.

Sterling Softens as Oil-Led Dollar Demand Strengthens
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Key Points

  • Both sterling and the euro weakened as Brent crude moved higher amid stalled U.S.-Iran talks, supporting the dollar.
  • GBP/USD was at $1.3232 and EUR/USD at $1.1344 in early U.S. trading, with markets pricing modest Fed tightening by October and little near-term ECB action.
  • UK shop price data showed slight easing in September, but retailers face cost pressures; swap spreads widened, reflecting funding and rate tensions that affect FX and fixed income markets.

Sterling traded lower on Tuesday while the euro also gave back ground, as renewed concerns around U.S.-Iran diplomacy helped push Brent crude towards $107 a barrel and left the dollar on firmer footing.

In early U.S. trade, GBP/USD was trading down 0.19% at $1.3232 and EUR/USD was 0.24% weaker at $1.1344, as of 04:48 ET (08:48 GMT).

Market confidence that talks between Washington and Tehran would make meaningful progress has waned. Iranian officials reportedly said a deal is unlikely before the Nov. 3 U.S. midterm elections, and the Trump administration declined an Iranian proposal to reopen the Strait of Hormuz. Brent crude earlier pushed as high as $109 a barrel on Monday, underpinning energy-linked dollar demand.


Dollar dynamics and strategist commentary

Francesco Pesole, FX strategist at ING, said the path for the dollar lower depends on stability in bond markets, and that outcome is closely tied to oil. "We need to see some stability in bonds for the dollar to correct lower. That relies heavily on oil, and the latest news isn’t encouraging. Upside risks are rising again for the greenback," he said.

Pesole added that equities had so far absorbed the shock of higher oil prices but cautioned that lofty equity valuations and rapidly rising rates create a growing tail risk that would likely be associated with significant dollar gains.

Markets are pricing around 17 basis points of Federal Reserve tightening by October, a stance that market participants describe as hawkish. ING’s baseline view is that both the Fed and the European Central Bank will hold off on policy moves until December, though ING acknowledged that a Fed hike in October would challenge that expectation.


Data due and positioning

Investors are watching U.S. data for further direction. US September consumer confidence was expected to stabilize around 89, and the JOLTS job openings report was anticipated to add texture to the August jobs picture. ING also signalled that it expects the U.S. jobs report due on Friday to be revised lower, noting last month’s payrolls reading looked "too strong."

Swap markets have also reflected stress in cross-currency funding conditions. The SOFR-ESTR two-year swap spread widened beyond 155 basis points, close to July’s peak near 163 basis points. Meanwhile, markets price roughly 9 basis points of ECB tightening by October.


UK prices and the pound

Analysts said the pound’s recent softening appears to be more a function of dollar strength than of a marked deterioration in UK fundamentals. Domestic price data was only mildly softer: the British Retail Consortium’s shop price index showed inflation easing to 1.4% in September from 1.5% in August, a touch below the 1.5% forecast and above the three-month average of 1.3%.

Within the BRC data, food inflation slowed to 2.5% from 2.8%, helped by promotions, while non-food inflation eased to 0.8% from 0.9%, with back-to-school discounting cited as a factor. The BRC noted retailers were absorbing higher business rates, employment costs, energy bills and packaging taxes, but warned there is a limit to how much additional cost can be taken on by firms.

Broader UK CPI inflation had risen to 3.1% in August, and the article referenced expectations that CPI could top 4% in early 2027 if conflict in Iran lifts energy prices further.


Euro area outlook and ECB remarks

The euro held up relatively better than the pound despite dovish language from European Central Bank President Christine Lagarde, who said tight financial conditions were limiting the pass-through of energy costs and argued the ECB should pursue a "measured response" given there was no evidence of second-round effects. ING’s baseline assumes a firmer EUR/USD by year-end if neither central bank acts before December.

Pesole noted that any strong U.S. macro release could prompt a test of the 1.1320-1.1330 summer lows for EUR/USD, and that Lagarde’s comments removed some of the euro’s support. ING also suggested that further dollar strength could push USD/CHF gains toward the 0.84-0.85 area.


Market implications

Overall, currency moves reflected a mix of geopolitics, oil prices and expectations around central bank timing. Traders and investors will remain sensitive to developments in U.S.-Iran negotiations, energy markets and upcoming U.S. economic releases that could shift the perceived path for Fed policy and thereby FX and cross-asset positioning.

Risks

  • Rising oil prices tied to stalled U.S.-Iran negotiations could sustain dollar strength and pressure currencies and risk assets - impacting energy and currency markets.
  • A potential Fed rate hike in October would challenge expectations for stable FX into year-end and could amplify dollar gains - affecting global bond and equity markets.
  • Retail margins in the UK may come under strain as firms absorb higher business rates, employment costs, energy bills and packaging taxes, which could affect consumer-facing sectors.

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