what is the net interest rate differential nird 
the net interest rate differential nird in international currency forex markets is the total difference in the interest rates of two distinct national economies for instance if a trader is long the nzd usd pair they will own the new zealand currency and borrow the u s currency the new zealand dollars in this case can be placed in a new zealand bank earning interest while simultaneously taking out a loan for the same notional amount from a u s bank the net interest rate differential is the after tax after fee difference in any interest earned and any interest paid while holding the currency pair position understanding the net interest rate differential nird generally an interest rate differential ird measures the contrast in interest rates between two similar interest bearing assets traders in the forex market use interest rate differentials when pricing forward exchange rates based on the interest rate parity a trader can create an expectation of the future exchange rate between two currencies and set the premium or discount on the current market exchange rate futures contracts the net interest rate differential is specific to use in currency markets the net interest rate differential is a key component of the carry trade a carry trade is a strategy that foreign exchange traders use in an attempt to profit from the difference between interest rates and if traders are long a currency pair they may be able to profit from a rise in the currency pair while the carry trade does earn interest on the net interest rate differential a move in the underlying currency pair spread could easily fall as it has historically and risk wiping out the benefits of the carry trade leading to losses the currency carry trade remains one of the most popular trading strategies in the currency market the best way to first implement a carry trade is to determine which currency offers a high yield and which offers a lower one the most popular carry trades nowadays involve buying currency pairs like the usd jpy and the aud jpy since these have interest rate spreads that are high enough to benefit from but use relatively stable currencies net interest rate differential and the carry tradethe nird is the amount the investor can expect to profit using a carry trade say an investor borrows 1 000 and converts the funds into british pounds allowing them to purchase a british bond if the purchased bond yields 7 and the equivalent u s bond yields 3 then the ird equals 4 or 7 minus 3 this profit is ensured only if the exchange rate between dollars and pounds remains constant one of the primary risks involved with this strategy is the uncertainty of currency fluctuations in this example if the british pound were to fall in relation to the u s dollar the trader may experience losses additionally traders may use leverage such as with a factor of 10 to 1 to improve their profit potential if the investor leveraged borrowing by a factor of 10 to 1 they could make a profit of 40 however leverage could also cause larger losses if there are significant movements in exchange rates that go against the trade 