GBP/USD Crumbles as Sterling's Rate Advantage Flips to Dollar

The GBP/USD pair fell to its weakest point in the monthly range at 1.3470 on Wednesday, as sterling's rate advantage flipped to favor the dollar with a Federal Reserve rate increase now priced at 86.7%.

The decline was driven by broad dollar strength, which saw the US currency rise 0.58% to reach its largest single-session gain since June. The EUR/USD pair also fell 0.55% to 1.1525, breaking below the 1.1600 level it defended all last week.

Sterling has been resilient relative to most majors this year, but the recent decline marks a shift in sentiment. With the UK labour market report due on Tuesday and consumer price inflation arriving on Wednesday morning, just hours before the Federal Reserve decision, cable enters the sequence at the bottom of its range.

The Bank of England's base rate is 3.75%, while the Federal Reserve's target range sits at 3.50% to 3.75%. If the Fed hikes rates on Wednesday, sterling's yield advantage over the dollar will disappear entirely. The interest rate arithmetic underpinning cable is about to invert, with the market having spent more time discussing gilt yields than the front end where currencies actually price.

The UK bond market has been misread by investors, who are pricing anxiety about upcoming debt issuance and the October Budget rather than the attractiveness of the rate differential. Rising gilt yields have accompanied a falling currency, indicating that foreign investors are hedging against sterling risk rather than buying it unhedged.