How interest rates affect forex
Interest rates move forex because capital prefers the currency that pays more, and because traders reprice a currency as soon as they change what they expect the central bank to do next. On EUR/USD the driver is the gap between Fed and ECB rate expectations: more cuts priced for the Fed than for the ECB tend to weaken the dollar against the euro, and the reverse tends to weaken the euro. A decision the market already expected often does little: the move comes from the change in that path.
The rate you see, and the path the market prices
The policy rate is the floor a central bank sets. For the Fed it is the target range for the federal funds rate. For the ECB it is the deposit facility rate, the rate banks earn on reserves. That number changes on meeting day, a handful of times a year. Forex does not wait for meeting day. It trades the path: how many cuts or hikes the next several meetings are expected to deliver, in basis points. A basis point is one hundredth of a percentage point. Twenty-five basis points is the usual size of one step.
The “probability” of a hike or a cut is not a poll of economists. It is the futures market on the policy rate, turned into a chance of hold, cut, or hike at a named meeting, and into an expected move in basis points. People often call the Fed version of that board a FedWatch-style tool. What you are reading is the same object either way: the price of the next meeting. A jump from a 20 percent chance of a cut to a 70 percent chance is the forex event. The press conference three weeks later only confirms it, or surprises what was left unpriced.
How a rate gap moves a pair
Capital prefers the currency that is expected to pay more, when other things are equal. If the path for US rates sits above the path for euro rates, holding dollars pays a wider gap than holding euros, and that gap is a reason for the dollar to be bid against the euro. If traders mark the US path down, the gap shrinks, and that reason weakens. Growth, risk appetite, and politics still move the pair. The rate gap is the part you can point at on a board. It is a tendency, not a guarantee that EUR/USD rises every time a US yield falls.
The pair follows the gap, not one bank in isolation. A week in which the Fed and the ECB are both expected to cut can still move EUR/USD, if one path moves more than the other. More cuts priced for the Fed than for the ECB tend to weaken the dollar against the euro. More cuts priced for the ECB than for the Fed tend to weaken the euro. A meeting that delivers exactly the cut everyone had priced, and says nothing new about the meetings after, often does little. Sometimes the currency even rises on a cut, because the bank signaled it was finished. The surprise is the change in the path, not the verb “cut” or “hike” in the headline.
What a Fed cut does, and what a hike probability does
Consequences of Fed cuts depend on whether they were already in the price, and on why the path moved. A cut that is larger, or sooner, than the board had priced usually shrinks the dollar’s yield advantage. EUR/USD, GBP/USD, and AUD/USD tend to rise. USD/JPY tends to fall, because the yen is the low-yield side of that pair. Gold, which pays no interest, tends to rise when the dollar and expected real yields fall together. If the cuts are being priced because traders fear a break in US growth, the same week can still bid the dollar against higher-beta currencies. The “risk off” bid and the “lower yield” offer are two different stories. Read which one the day is.
A rising hike probability, or a falling cut probability, is the mirror. After a hot wage print or a hot inflation print, the board can go from one cut priced to a hold, or from a hold to a hike. The dollar’s expected path is marked higher. USD/JPY often rises. Gold often falls. EUR/USD falls if the ECB path did not move by as much. You do not need the meeting. You need the change in the chance of the next move, and the expected basis points that sit under it. A probability that drifts two points and comes back is noise. A probability that jumps and stays is the path.
ECB expectations against Fed expectations
EUR/USD is the cleanest pair for this comparison because each leg has one central bank and a deep rates market. Anticipation of ECB rates lives in the same kind of board as anticipation of Fed rates: the chance of the next move, and how many basis points the next meetings are priced to deliver. If Europe prices an extra cut that the US does not, the euro’s yield path falls relative to the dollar and EUR/USD tends to fall, even in a week when the headline is “central banks are easing”. If the ECB pushes back and takes a cut off the board while the Fed path is unchanged, the euro tends to rise. The sentence you want is which path moved more since last month, not which bank is “hawkish” in the abstract.
The same gap shows up in other pairs, with a less tidy second bank. GBP/USD is the Fed against the Bank of England. USD/JPY is the Fed against the Bank of Japan, where the yen’s low rate is the reason the pair can trend for a long time when the US path stays high. For EUR/USD, keep the comparison to two boards: Fed and ECB. Dated headlines about one month’s decision go stale the week after. The path of the next few meetings is what is still useful on Monday.
Steps when the path moves
Do this when a data print or a speech has just hit, and again once a week if nothing has. The order stops you reacting to one bank and forgetting the other leg of the pair.
- Read the current policy rate for the Fed and for the ECB. Know the level you are moving away from.
- Read the chance of the next move at each bank: hold, cut, or hike, and the expected basis points.
- Compare that board to a month ago, or to the day before the print. The change is the news. The level is the background.
- Ask which path moved more. That bank is the one the pair is reacting to.
- Then look at EUR/USD. A move in the pair without a move in the gap has some other cause. A move in the gap without a move in the pair is a gap the spot market has not digested yet, or a gap that growth and risk are canceling.
The carry trade is the slow version of the same gap
A carry trade funds itself in a low-rate currency and holds a higher-rate one. The trader earns the gap while the exchange rate stays calm. It is not a separate signal from the path. It is what people do with a gap that they expect to last. The yen has often been the funding leg, because Japanese rates sat far below US and European rates. The trade works until the exchange rate moves by more than the gap, which is what happens when rate expectations flip, or when volatility spikes and everyone leaves at once. A guide to the path already contains the carry. You do not need a second theory. You need to know that a calm, wide gap invites the trade, and that a repricing of the low-rate bank or the high-rate bank is how it ends.
Example: a cut that was not in the price
Illustration. The board has two Fed cuts priced over the coming meetings and none from the ECB. A soft US inflation print lifts the chance of the first Fed cut from 40 percent to 75 percent, and the expected basis points for that meeting move with it. The dollar’s expected yield falls against the euro. EUR/USD often rises on that repricing, before either committee has voted. Gold often rises with the euro, for the same reason. If, a week later, the ECB signals a cut of its own and the Fed probability does not move further, the gap closes and the euro move can give way. The policy rate did not have to change overnight. The expectation did. The pair followed the gap, then gave the move back when the gap closed.
Example: both banks cut, and the euro still falls
Another illustration. The Fed is priced for one cut. The ECB, after a weak European survey, is priced for two. Both headlines say “easing”. The euro’s path fell by more. EUR/USD can fall on a week when nobody hiked and both banks sound soft, because the gap widened in the dollar’s favor. Selling the dollar because “rates are falling” misses the comparison. The question is whose rates are falling faster in the price. If the next data print puts a hike probability back on the Fed board, or takes the extra ECB cut away, the gap moves again and the pair can reverse the week. You track the two probabilities. You do not track the adjectives.
Where the path sits on Novex
Interest Rates shows the chance of the next Fed move and the next ECB move, the expected basis points, and how that path has repriced over 30 days. The same board covers the other central banks when the pair is not EUR/USD. Use it for the steps above: level, probability, change versus the recent window, then the comparison between the two banks of the pair. The page is the board. The sentence about the gap is still yours to write.
Common questions
How do interest rates affect forex?
They move currencies through the expected yield gap. The currency whose path is marked higher tends to rise against the one whose path is marked lower. The policy rate itself matters less than the change in what the next meetings are priced to do.
How do interest rate cuts affect forex?
A cut that is deeper or sooner than the market had priced usually weakens that currency, so a surprise Fed cut tends to weigh on the dollar and to lift gold. A cut that was already fully priced often does little, and can even lift the currency if the bank says the cuts are done. Fear of a growth break can still bid the dollar against risk-sensitive currencies in the same week.
What does a Fed rate hike probability tell you?
It is the futures market’s chance that the next meeting hikes, or the mirror image of how many cuts are left on the board. A jump that sticks is a higher dollar path. USD/JPY often rises and gold often falls with it. The meeting is the confirmation, not the first move.
How do Fed and ECB rate expectations drive EUR/USD?
Compare the two paths. More easing priced for the Fed than for the ECB tends to lift EUR/USD. More easing priced for the ECB tends to lower it. A week when both banks ease can still move the pair, in the direction of whichever path was marked down more.
What is a FedWatch-style probability?
It is the futures price of the policy rate, shown as the chance of a hold, a cut, or a hike at the next meeting, plus the expected basis points. The name on the tool matters less than the change since the last time you looked. That change is what forex is trading.