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Finance[Floor] - create new interest rate floor

Calling Sequence

Floor(floatingleg, exerciserates)




list of floating-rate coupons; floating leg



non-negative number or a list of non-negative numbers; exercise rates



The Floor command creates a new interest rate floor instrument with the specified parameters. This instrument can be viewed as a payer interest rate swap where each exchange payment is executed only if it has positive value. (see Brigo and Mercurio (2001) for more details).


Assume that we have a set of coupon payments to occur at the times T1, T2, ..., Tn. At each time instance Ti the floor pays




N is the nominal value,


dTi is the year fraction between dates Ti1 and Ti,


PTi is a coupon payment at the time Ti,


Ki is the fixed rate at time Ti.


The parameter floatingleg defines floating-rate coupon payments. The parameter exerciserates defines the corresponding fixed rates. The first exercise rate corresponds to the first floating rate coupon, the second exercise rate corresponds to the second floating rate coupon, etc. If the size of the exerciserates list is smaller than the size of the floatingleg list then the last exercise rate will be used for all the remaining coupons.


The LatticePrice command can be used to price an interest rate floor using any given binomial or trinomial tree. The BlackPrice command will compute the price of an interest rate floor using the Black model.



Set the global evaluation date. This date is taken as the reference date for all yield curves and benchmark rates unless another date is specified explicitly.

SetEvaluationDateNovember 17, 2006:


November 17, 2006


The nominal amount is 100.




Create a 6-month EURIBOR benchmark rate with a forecasted rate of 5%. No history is available for this rate.


benchmark:=moduleend module


Construct a discount interest rate curve.


discount_curve:=moduleend module


Construct floating-leg payments.


start_date:=November 19, 2006



end_date:=November 19, 2026




Construct an interest rate floor with a fixed floor rate of 3% for all payments in the floating leg.


ir_floor:=moduleend module


Price this instrument using the Black model with a discount rate of 5% and a volatility of 20%.




See Also

Finance[BlackPrice], Finance[Cap], Finance[Collar], Finance[FixedRateCoupon], Finance[InArrearIndexedCoupon], Finance[InterestRateSwap], Finance[LatticePrice], Finance[ParCoupon], Finance[SimpleCashFlow], Finance[UpFrontIndexedCoupon]



Brigo, D., Mercurio, F., Interest Rate Models: Theory and Practice. New York: Springer-Verlag, 2001.


Glasserman, P., Monte Carlo Methods in Financial Engineering. New York: Springer-Verlag, 2004.


Hull, J., Options, Futures, and Other Derivatives, 5th. edition. Upper Saddle River, New Jersey: Prentice Hall, 2003.

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