# How Interest Rate Floors Work?

An interest rate floor is similar to an interest rate cap agreement. An interest rate floor is an agreement between the seller or provider of the floor and an investor which guarantees that the investor’s floating rate of return will not fall below a specified level over an agreed period of time. Analytically, this represents the purchase of a series of put options on the relevant interest index coinciding with the rollover dates of the investor’s floating rate assets.

Similar to an interest rate cap, the investor selects a reference rate to hedge, the period of time to hedge and the level of protection desired in return for an up-front fee or premium.

If market rates fall below the floor rate, then the floor provider will make payments are made and the investor enjoys market rates of return.

The payoff of a floor is given by the following formula:

(Strike Rate-Index Level) x(# Days in period/360) x (Notional Amount)