An interest rate is the cost of borrowing money, expressed as a percentage of the principal. In forex, interest rates set by central banks are key drivers of currency values because they influence how attractive a currency is to foreign investors.
How Interest Rates Work in Forex
Each country's central bank sets a benchmark interest rate. Higher rates encourage investors to buy that currency to earn a return, strengthening it. Lower rates make a currency less attractive, weakening it. This is why forex traders monitor central bank announcements closely—even small rate changes can trigger sharp price movements.
Interest Rate Differentials and Carry Trades
When two currencies have different interest rates, the difference affects their exchange rate. Traders exploit this through carry trades: they borrow in a low-interest-rate currency and invest the proceeds in a high-interest-rate currency, earning the difference as profit. This works because the interest earned from the higher-rate currency compensates the trader for the cost of borrowing in the lower-rate one.
Market Impact and Risk
- Volatility: Unexpected rate announcements cause sharp price swings as traders reprrice currencies.
- Anticipation: Markets move in advance of expected rate changes, not just when they happen.
- Global events: Economic reports, geopolitical developments, and central bank communications all influence rate expectations.
What Traders Watch
Central bank meeting dates, inflation data, and economic forecasts are critical. When the Federal Reserve, European Central Bank, or Bank of England signals a rate change, forex markets react immediately. This makes interest rates one of the most important fundamentals in currency trading.
