A currency swap is similar to an interest rate swap, except that in a currency swap, there is often an
exchange of principal, while in an interest rate swap, the principal does not change hands.
In currency swap, on the trade date, the counter parties exchange
notional amounts in the two currencies. For example, one party receives $10 million British pounds (GBP), while the other receives $14 million U.S. dollars (USD). This implies a GBP/USD
exchange rate of 1.4. At the end of the agreement, they will swap again using the same exchange rate, closing out the deal.
Since swaps can last for a long time, depending on the individual agreement, the exchange rate in the market place (not on the swap) can change dramatically over time. This is one of the reasons institutions use these currency swaps. They know exactly how much money they will receive and have to pay back in the future.
During the term of the agreement, each party pays interest periodically, in the same currency as the principal received, to the other party. There are number of ways interest can paid. It can paid at a
fixed rate,
floating rate, or one party may pay a floating while the other pays a fixed, or they could both pay floating or fixed rates.
On the maturity date, the parties exchange the initial principal amounts, reversing the initial exchange at the same exchange rate.