What is 'Covered Interest Arbitrage '
Covered interest arbitrage is a strategy in which an investor uses a forward contract to hedge against exchange rate risk. Covered interest rate arbitrageis the practice of using favorable interest rate differentials to invest in a higheryielding currency, and hedging the exchange risk through a forward currency contract. Covered interest arbitrage is only possible if the cost of hedging the exchange risk is less than the additional return generated by investing in a higheryielding currency. Such arbitrage opportunities are uncommon, since market participants will rush in to exploit an arbitrage opportunity if one exists, and the resultant demand will quickly redress the imbalance. An investor undertaking this strategy is making simultaneous spot and forward market transactions, with an overall goal of obtaining riskless profit through the combination of currency pairs. Covered interest arbitrage is not without its risks, which include differing tax treatment in various jurisdictions, foreign exchange or capital controls, transaction costs and bidask spreads.
BREAKING DOWN 'Covered Interest Arbitrage '
Returns on covered interest rate arbitrage tend to be small, especially in markets that are competitive or with relatively low levels of information asymmetry. While the percentage gains are small they are large when volume is taken into consideration. A four cent gain for $100 isn't much but looks much better when millions of dollars are involved. The drawback to this type of strategy is the complexity associated with making simultaneous transactions across different currencies.
Note that forward exchange rates are based on interest rate differentials between two currencies. As a simple example, assume currency X and currency Y are trading at parity in the spot market (i.e. X = Y), while the oneyear interest rate for X is 2% and that for Y is 4%. The oneyear forward rate for this currency pair is therefore X = 1.0196 Y (without getting into the exact math, the forward rate is calculated as [spot rate] times [1.04 / 1.02]).
The difference between the forward rate and spot rate is known as “swap points”, which in this case amounts to 196 (1.0196 – 1.0000). In general, a currency with a lower interest rate will trade at a forward premium to a currency with a higher interest rate. As can be seen in the above example, X and Y are trading at parity in the spot market, but in the oneyear forward market, each unit of X fetches 1.0196 Y (ignoring bid/ask spreads for simplicity).
Covered interest arbitrage in this case would only be possible if the cost of hedging is less than the interest rate differential. Let’s assume the swap points required to buy X in the forward market one year from now are only 125 (rather than the 196 points determined by interest rate differentials). This means that the oneyear forward rate for X and Y is X = 1.0125 Y.
A savvy investor could therefore exploit this arbitrage opportunity as follows 
 Borrow 500,000 of currency X @ 2% per annum, which means that the total loan repayment obligation after a year would be 510,000 X.
 Convert the 500,000 X into Y (because it offers a higher oneyear interest rate) at the spot rate of 1.00.
 Lock in the 4% rate on the deposit amount of 500,000 Y, and simultaneously enter into a forward contract that converts the full maturity amount of the deposit (which works out to 520,000 Y) into currency X at the oneyear forward rate of X = 1.0125 Y.
 After one year, settle the forward contract at the contracted rate of 1.0125, which would give the investor 513,580 X.
 Repay the loan amount of 510,000 X and pocket the difference of 3,580 X.

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