The Bank of England sets interest rates for the UK, but sterling often takes its biggest moves from decisions made in Washington. When the Federal Reserve raises rates, or even hints that it might, the pound usually feels the pressure against the dollar. Understanding why helps UK traders make sense of days when the pound falls without any British news at all.
The basic link
Currencies respond to the return investors can earn on holding them. When the Fed raises its policy rate, yields on US cash and short-term Treasury bonds tend to rise. Holding dollars becomes more rewarding relative to holding pounds, so money flows towards the dollar and GBP/USD tends to fall.
What matters is the gap between the two countries, not the US rate on its own. Our guide to how interest rate expectations move FX explains that rate differentials are one of the main forces behind currency moves.
Expectations do the work
Markets price rate changes well in advance. By the time the Fed actually raises rates, the move is usually expected and already reflected in the exchange rate. The reaction on the day depends on the surprise: whether the hike was bigger or smaller than expected, and what officials signal about the path ahead.
A hike delivered with cautious language can actually lift the pound if traders conclude the Fed is nearly done. A hike with a warning that more could follow tends to push the dollar higher. The press conference and the Fed’s projections often matter more than the decision itself.
The safe-haven effect
There is a second channel. Rising US rates can tighten financial conditions worldwide, making borrowing dearer and hitting share prices. When investors become nervous, they often seek safety in the dollar, which is the world’s main reserve currency. Sterling, by contrast, tends to behave like a risk-sensitive currency and can weaken when global markets fall.
So a Fed hike can hurt the pound twice: once through the rate gap and again through a more cautious mood.
When the pound holds up
The relationship is not mechanical. If the Bank of England is raising rates just as fast, or faster, the gap may not widen and sterling can hold its ground. That happened at times during the 2022 to 2023 tightening cycle, when both banks were hiking aggressively to fight inflation.
UK factors can also dominate. Strong British wage or inflation data, political events or fiscal news can outweigh the Fed. In late 2022 the gilt market turmoil after the mini-budget drove sterling far more than anything the Fed did.
And if a Fed hike raises fears of a US recession, the dollar can eventually weaken as markets price future cuts. Currencies trade on where rates are heading, not just where they are.
What UK traders watch
On Fed decision days, UK traders focus on the statement, the dot plot of officials’ rate projections when it is published, and the chair’s press conference. Two-year Treasury yields are a useful gauge of how markets are pricing the Fed, and comparing them with two-year gilt yields shows the gap that matters for GBP/USD.
It is also worth remembering timing. Fed decisions land at 2pm in Washington, which is 7pm UK time in winter and the evening in summer, so the biggest sterling moves often happen after the London close. Our piece on what a Fed hold means for markets covers the other side of the coin.
The bottom line
A Fed rate hike usually pressures the pound by widening the interest rate gap in the dollar’s favour and by making investors more cautious. But expectations, the Bank of England’s own path and UK news can all change the outcome. The surprise matters more than the decision. If you want to test how well you understand these links before trading them, take the free Samuel & Co trader assessment.
