Educational content only, not financial advice. Trading forex and CFDs on margin carries a high risk of loss.
If you want to understand why a currency pair trends for weeks or months, start with interest rates. The interest rate differential, the gap between the rates set by two central banks, is one of the most powerful forces in the forex market.
Why Interest Rates Move Currencies
Money tends to flow toward higher returns. When one country offers higher interest rates than another, investors can earn more by holding assets in that country’s currency, such as government bonds or bank deposits. To buy those assets, they first need to buy the currency, which increases demand for it.
So, all else being equal:
- A wider gap in favor of a currency tends to support it
- A narrowing gap tends to weaken it
Where Major Central Banks Stand Now
As of mid-November 2026:
- Reserve Bank of Australia: 4.85%
- Bank of England: 4.00%
- Federal Reserve: 3.75%โ4.00%
- European Central Bank: 2.50% (deposit rate)
- Bank of Japan: 1.25%
Example 1: EUR/USD
The Fed’s rate is at least 1.25 percentage points above the ECB’s. After hot US inflation data, markets priced an almost certain Fed hike in December, which would widen that gap further. EUR/USD fell from around 1.12 to an 18-month low near 1.1050 within days.
Example 2: USD/JPY
The gap between US and Japanese rates is even wider, at more than 2.5 percentage points. That is the main reason USD/JPY has spent much of 2026 near the 160 level, despite Japan spending heavily to support the yen.
It’s About Expectations, Not Just Today’s Rate
Markets look ahead. A currency often moves when expectations for future rates change, long before the central bank actually acts. That is why data like inflation and jobs reports, and comments from central bank officials, can move currencies so sharply. They change what traders expect rates to be months from now.
A useful way to track this is the 2-year government bond yield, which closely reflects expected interest rates. When the gap between US and German 2-year yields widens in the dollar’s favor, EUR/USD usually falls.
The Carry Trade
Some traders aim to earn the interest rate difference directly. In a carry trade, a trader buys a higher-yielding currency against a lower-yielding one and may earn a daily interest payment, called a swap or rollover, for holding the position overnight. The risk is that the exchange rate moves against them by more than the interest earned. Carry trades can unwind very quickly when markets turn risk-averse.
When Rate Differentials Don’t Work
- Risk-off panics: investors may buy safe havens like the yen or Swiss franc even if their rates are low.
- Intervention: governments can step in to support their currency, as Japan has done.
- Inflation: high rates that only match high inflation may not attract investors.
- Already priced in: if a hike is fully expected, the currency may not react when it happens.
How to Use This in Your Trading
- Know the current rates and the next meeting dates for the currencies you trade.
- Watch the data that shapes rate expectations: use an economic calendar.
- Use the rate trend to set a directional bias, then time entries with technical tools like trend following.
- Always manage risk. Read our risk management guide.