Definition
Interest Rate Differential
The interest rate differential is the gap between interest rates of two countries, a core driver of currency carry trades, forward premiums and long-run exchange rate trends.
The difference between India's policy rate and the US Fed funds rate shapes capital flows. A wide positive gap (Indian rates well above US rates) attracts carry inflows and pushes up the USDINR forward premium.
When the US Fed hikes aggressively and the gap narrows, the rupee tends to weaken as the yield advantage of holding Indian assets shrinks. This differential, not central-bank forecasts, mathematically determines forward currency pricing under interest rate parity.
Related terms
- Forward Premium / DiscountA currency trades at a forward premium when its forward rate is higher than spot, and at a discount when lower, driven mainly by the interest rate gap between the two countries.
- Carry TradeA carry trade borrows in a low-yielding currency and invests in a higher-yielding one, profiting from the interest rate differential as long as the exchange rate stays stable.
- Covered Interest Rate ParityCovered interest rate parity holds that the forward exchange rate must offset the interest rate gap between two currencies, otherwise risk-free arbitrage would be possible.
- Federal Open Market Committee (FOMC)The FOMC is the Federal Reserve's policy-setting committee that meets eight times a year to decide US interest rates and the path of monetary policy.
Plain-English explainer from The Dispatch Investors Encyclopedia. General information, not financial advice.