Also called: central bank rate, policy rate, benchmark rate
The cost of borrowing money set by a central bank — the single most important driver of currency strength in modern forex markets.
Interest rates are set by central banks to manage their economies. Higher rates make a currency more attractive (you earn more interest holding it) but slow the economy (loans are more expensive). Lower rates do the opposite. Currencies tend to strengthen when their central bank is raising rates (or expected to) and weaken when their bank is cutting (or expected to).
The key insight is that markets price the EXPECTED rate path, not just the current rate. A central bank can hike 25 basis points and the currency falls — because the market was pricing in 50 basis points. The actual rate move matters less than how it compares to expectations.
Rate differentials between two countries drive currency pairs. If the Fed is at 5% and the BoJ is at 0.1%, USD/JPY tends to rise because dollar-holders earn more interest. If the gap narrows (Fed cuts, BoJ hikes), USD/JPY falls.
USD/JPY's run from 130 to 161 in 2023-2024 was almost entirely driven by the rate differential — Fed at 5%+ vs BoJ near 0%. When the gap finally narrowed in August 2024, USD/JPY collapsed 1,800 pips.
Frequently asked about interest rate
What is an interest rate in trading?+
The cost of borrowing money set by a central bank — the single most important driver of currency strength in modern forex markets.
When will I see interest rate used in real trading?+
On every central bank decision day (FOMC, ECB, BoE, BoJ, etc.) and every economic release that affects rate expectations.
What is the most common mistake traders make with interest rate?+
Trading rate decisions on the headline number without checking forward guidance. The press conference and the dot plot move markets MORE than the actual rate change.
What do experienced traders know about interest rate that beginners don't?+
Track the rate differential between two currencies as a leading indicator for the pair. EUR/USD's direction over multi-month windows is heavily driven by the gap between Fed and ECB rates.
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