LONDON – The British pound is entering a potentially volatile period after the U.S. Federal Reserve raised interest rates while inflation in the United Kingdom accelerated to 3.1 percent. With the Bank of England expected to keep its benchmark rate unchanged, investors are increasingly focused on the widening divergence between monetary policy in Britain and the United States and what that could mean for GBP/USD.
A fact-check of the underlying economic claims shows that most of the central argument is supported by the latest data, although some elements require clarification. In particular, forecasts that GBP/USD will fall below 1.3400 are market analysis rather than established fact.
The Federal Reserve on Wednesday raised its target range for the federal funds rate by 25 basis points to 3.75–4.00 percent. The decision was unanimous. The Fed said U.S. economic activity continues to expand at a solid pace, domestic spending remains resilient and inflation is still elevated.
The move was the Fed's first interest-rate increase since 2023 and strengthened expectations that U.S. borrowing costs could remain elevated as policymakers seek to bring inflation back toward their 2 percent target.
That development is potentially negative for sterling. Higher U.S. interest rates can increase demand for dollar-denominated assets, particularly when investors expect American rates to remain higher or rise faster than those in other major economies.
The original analysis is therefore correct in identifying the expected path of interest rates—not simply today's rate differential—as an important factor for GBP/USD.
At the same time, however, the Bank of England faces its own inflation problem.
Official figures released Wednesday by Britain's Office for National Statistics show that consumer-price inflation increased from 2.9 percent in July to 3.1 percent in August. Transport costs, particularly motor fuels, were the largest contributor to the acceleration.
The increase leaves inflation substantially above the Bank of England's 2 percent target.
Underlying inflation nevertheless presented a more stable picture. Core CPIH inflation, which excludes energy, food, alcohol and tobacco, remained unchanged at 2.9 percent, while services inflation held at 3.6 percent.
That distinction could prove important for Thursday's Bank of England decision. If policymakers conclude that the latest inflation increase is primarily the result of higher fuel and other externally driven costs rather than broader domestic price pressures, they may be less inclined to respond immediately with another rate increase.
Markets broadly expect the Bank of England to keep Bank Rate at 3.75 percent. Attention is therefore likely to shift quickly from the headline decision to the Monetary Policy Committee's vote and its assessment of inflation risks.
A more hawkish message indicating that policymakers are prepared to raise rates if inflation remains persistent could support the pound. Conversely, a relatively cautious position could reinforce expectations that U.S. monetary policy will remain tighter than British policy and increase pressure on sterling.
The strength of the American economy is also complicating the picture for the pound.
U.S. retail and food-services sales jumped 1.2 percent in August compared with July and were 6 percent higher than a year earlier, according to the U.S. Census Bureau. Sales reached a seasonally adjusted $773.9 billion.
The unexpectedly strong spending figures reinforce the Federal Reserve's assessment that domestic demand remains resilient. A stronger economy potentially gives the Fed greater freedom to maintain restrictive monetary policy while concentrating on inflation.
That means upcoming American inflation, employment and spending figures could prove just as important for sterling as developments in Britain.
The claim that GBP/USD could fall below 1.3400, however, should be treated differently from the verified economic data.
The 1.3400 level is a technical market reference rather than an economic threshold. A sustained move below it could encourage traders who follow technical indicators to become more bearish, but there is no fundamental reason that crossing 1.3400 by itself would guarantee a deeper decline.
The broader direction will depend heavily on how expectations for U.S. and British interest rates evolve.
Sterling therefore finds itself caught between competing forces. Britain's higher inflation reduces the Bank of England's room to ease monetary policy and could eventually produce another rate increase, which would normally support the pound. At the same time, the Fed has already resumed tightening, U.S. consumer spending remains strong and American interest rates are now higher.
The immediate test comes from the Bank of England. If policymakers signal that the rise in British inflation warrants tighter policy, sterling could regain some ground. If the Bank emphasizes the energy-driven nature of the inflation increase and maintains a more patient stance, the dollar could retain the advantage.
For GBP/USD, a move below 1.3400 is therefore possible, but it should be regarded as a market scenario rather than a forecast that can be established through fact-checking. The more consequential question is whether the Federal Reserve and Bank of England are now entering materially different phases of their monetary-policy cycles.