Interest rates affect exchange rates mainly through money chasing yield: when one country’s interest rates rise relative to another’s, its currency tends to attract more demand and strengthen, while a currency with lower or falling rates tends to weaken. How far a rate actually moves the currency depends on expectations, inflation and risk appetite — not the headline decision alone.
For anyone converting a large sum — a property deposit, sale proceeds, a supplier invoice or a pension — this matters because a central bank decision can shift a rate by more in a single morning than a provider’s margin adds over the whole transfer. This guide explains the mechanism, why a rate rise does not always lift a currency, and what it means for the timing of a large transfer.
Why do interest rates move exchange rates?
Money tends to move to where it earns the most for a given level of risk. When a central bank raises its policy rate, the return on that currency’s government bonds and deposits rises with it, so international investors have more reason to hold it. That extra demand pushes the currency up. When rates are cut, the opposite pull applies and the currency tends to soften.
The Bank of England describes the exchange rate as one of the channels through which a change in Bank Rate feeds through to the wider economy: other things being equal, a rise in UK interest rates relative to rates abroad tends to make sterling more attractive to hold and to raise its exchange rate. The word that carries the weight is relative — an exchange rate is a comparison of two currencies, so what matters is the gap between two countries’ rates, not the level of either one on its own.
This re-pricing happens fast. The foreign-exchange market is the largest in the world, with around US$9.6 trillion traded each day in April 2025 according to the Bank for International Settlements, so an unexpected word from a policymaker can move a rate within seconds. You can see the effect on live exchange rates around any major policy meeting.
What is the interest rate differential, and why does it drive GBP/EUR?
The interest rate differential is the gap between two central banks’ policy rates — for example, between the Bank of England’s Bank Rate and the European Central Bank’s key rate. It is the single clearest driver of a currency pair over the medium term.
When the Bank of England holds rates above those of the European Central Bank, sterling assets pay more than euro assets, which tends to support GBP/EUR. As that gap narrows — because the Bank cuts, or the ECB raises — sterling’s yield advantage shrinks and the pair can drift lower. The same logic sets the pound against the dollar when the Federal Reserve and the Bank of England move apart, which feeds straight into the cost of sending money to the USA.
This differential is also why the forward rate differs from the spot rate: the gap between two currencies’ interest rates is added to or taken off today’s rate to price a future date. For the current gap and where it may head, see our GBP, EUR and USD forecasts.
Does raising interest rates always strengthen a currency?
No. A rate rise only lifts a currency if it is not already expected. Markets price in likely decisions ahead of time, so by the time a widely anticipated rise is announced, much of it is already in the exchange rate. What actually moves the currency on the day is the surprise — the difference between the decision, and the guidance that comes with it, and what traders had assumed. Research from the US Federal Reserve finds the dollar is highly sensitive to shifts in expectations about the path of policy, not just to the rate change itself.
Two other forces can override the simple “higher rate, stronger currency” rule:
- Inflation. It is the real (inflation-adjusted) return that draws capital. A rate rise that still leaves rates below the inflation rate can sit alongside a weaker currency, because the real return is falling even as the headline rate climbs.
- Risk appetite. In a market panic, investors move to currencies they see as safe — often the US dollar — regardless of the rate on offer, so safe-haven demand can outweigh the interest-rate story for a time.
Do interest rate expectations matter more than the decision itself?
Frequently, yes. A currency can move well before a single rate changes, driven by forward guidance, the tone of a central bank’s statement, the split of the votes and incoming data on inflation and jobs. If markets come to expect the Bank of England to raise rates faster than the ECB, the pound can strengthen against the euro on that expectation alone. The Federal Reserve’s own analysis of recent tightening cycles shows exchange rates responding to the expected policy path rather than to isolated meetings.
This is why the calendar matters. If a large payment falls near a Federal Reserve decision or the next Bank of England meeting, the rate you see beforehand can look quite different once the guidance lands.
How does a currency usually react to an interest rate decision?
The reaction depends far more on expectations than on the direction of the move. The table below sets out the typical patterns.
| Interest-rate event | Typical effect on the currency | Why |
|---|---|---|
| Rate rise, exactly as markets expected | Little net movement | The rise was already priced into the rate |
| Rate rise larger than expected (hawkish surprise) | Currency tends to strengthen | A new yield advantage that was not yet in the price |
| Rate cut, or dovish guidance | Currency tends to weaken | Lower expected returns reduce demand to hold it |
| Rate held, but guidance signals future rises | Currency can strengthen | Markets price the expected path, not just today’s rate |
| Rate rise, but still below the inflation rate | Currency may weaken anyway | The real, inflation-adjusted return is falling |
How much can an interest-rate move change what I receive on a transfer?
Enough to dwarf most other costs on a large transfer. Interest-rate news often moves a major pair by two or three cents over a few weeks, and on a six-figure sum that runs to thousands of pounds.
Take an illustrative euro purchase of €400,000. At an illustrative GBP/EUR rate of 1.17, that costs £341,880. If a widening interest-rate gap pushes the rate to 1.14 before you convert, the same €400,000 costs £350,877 — about £9,000 more. On this pair, a single cent of movement is worth close to £3,000 on €400,000, and a 2% swing is €8,000 of purchasing power.
These are round, illustrative figures, not today’s rate. For live numbers, use the currency converter or check the live GBP to EUR rate before you plan around them.
Common mistakes when reading interest rates and exchange rates
- Assuming a rate rise must strengthen the currency. If the rise was expected, it is already in the price; the reaction comes from the surprise.
- Watching the headline rate, not the real rate. A rise that trails inflation can sit alongside a weaker currency.
- Looking at one central bank in isolation. GBP/EUR depends on both the Bank of England and the ECB; it is the gap between them that moves.
- Trying to trade a payment around a meeting. Holding out for a decision means carrying the risk of a surprise that goes against you, right when the money is due.
- Treating a pegged currency like a free-floating one. A country that pegs its currency gives up an independent interest-rate lever, so the usual rate-differential logic does not apply in the same way.
How can I protect a large transfer from interest-rate swings?
No one can reliably predict what a central bank will do, or how markets will read it. What you can decide is how much of that uncertainty to carry. A few durable options help:
- Fix the rate in advance. A forward contract lets you secure today’s rate for a payment up to 12 months ahead, so a decision that moves the market after you book does not change your cost.
- Set a target rate. An order can execute automatically if the market reaches a rate you are happy with, without watching a screen through every meeting.
- Weigh the timing honestly. Our guides on whether to lock in a rate or wait and the best time to exchange currency set out the trade-offs without pretending the direction is knowable.
At Cambridge Currencies, every transfer is handled by phone with a dedicated specialist, and client funds are safeguarded through our FCA-authorised partners, Currencycloud and ScioPay. That means you can talk through how a coming rate decision sits against your payment date before you commit.
Frequently asked questions
Do higher interest rates always mean a stronger currency?
No. A currency tends to strengthen when rates rise relative to other countries and by more than markets expected. A rise that was already anticipated, or one that leaves rates below inflation, can leave the currency flat or weaker.
Which interest rate matters for GBP/EUR — the Bank of England’s or the ECB’s?
Both. GBP/EUR is driven by the gap between Bank Rate and the ECB’s key rate, so a change at either central bank — or a change in what markets expect either to do — can move the pair.
What is the real interest rate, and why does it matter for exchange rates?
The real interest rate is the headline (nominal) rate minus inflation. It is the real return that draws international capital over time, which is why a nominal rise that trails inflation may not support a currency.
Why does the pound sometimes fall when the Bank of England raises rates?
Usually because the rise was expected and already priced in, or because the accompanying guidance was softer than markets hoped. The reaction reflects the surprise relative to expectations, not the direction of the move alone.
How do interest-rate expectations move the pound before a decision?
Markets price in the likely path of rates in advance, so guidance, voting splits and inflation data can shift the pound days or weeks before any rate actually changes. The decision itself often just confirms what is already in the price.
Can I fix an exchange rate before a central bank decision?
Yes. A forward contract lets you fix today’s rate for a future payment, so a decision that moves the market afterwards does not change what you pay. You can request a live quote to see the rate available for your payment date.
Talk through a rate decision before your payment date
If a Bank of England, ECB or Federal Reserve decision falls close to a large euro or dollar payment you have coming up, it is worth understanding how it could move your cost before you convert. Request a no-obligation quote and a Cambridge Currencies specialist will talk it through with you by phone.
