A Forward Rate Agreement (FRA) is a contract where
an agreed interest rate Rk applies to an agreed principal P for
an agreed period of time, say between Ts and Te. Normally the pay-off
is computed without waiting the interest period, by computing the
future value of the FRA at Te, and using the actual rate R at Ts
the future value as follows:
Payment = P . (1 + Rk)(Te-Ts)/( R. (Te-Ts) ) - P
The times Ts and Te must be computed using an agreed interest rate basis.