Codifyit Financial Products in 5 Minutes Module 09 of 09
Module 09 · Financial Products in 5 Minutes

Swaption

An option on a swap

The right to enter an interest rate swap later, on terms agreed today — plus a choice about exactly when that right can be used.

YOU PAY PREMIUM — TODAY YOUR RIGHT — ENTER A 5YR SWAP: PAY FIXED 4.20% vs FLOATING YOU SWAPTION BUYER THE BANK SWAPTION SELLER RATES ROSE → exercise into 4.20% RATES FELL → let it expire, take the market rate insurance on a decision you haven't made yet
A payer swaption: the right, bought today, to enter a pre-agreed swap later. A receiver swaption is the mirror image — the right to receive fixed instead.
EUROPEAN — EXERCISE ONLY AT EXPIRY AMERICAN — EXERCISE ANY BUSINESS DAY BERMUDAN — EXERCISE ON SET DATES ONLY TODAY EXPIRY TODAY EXPIRY TODAY EXPIRY
The three exercise styles. European gives you one shot, right at expiry. American gives you every day up to it. Bermudan — the common one for swaptions — gives you a handful of set dates, usually matching the underlying swap's coupon dates.
1

What it actually is

A swaption is an option to enter into an interest rate swap on pre-agreed terms — fixed rate, notional, tenor — at a future date. Buy a "payer" swaption and you get the right to pay fixed; buy a "receiver" swaption and you get the right to receive fixed.

Like any option, you pay a premium today for that right, and the terms of the underlying swap are locked in from the start.

2

Why someone would do this

A company expecting to take out floating-rate debt in six months, but worried rates will have risen by then, can buy a payer swaption now.

If rates do rise, it exercises into a swap at the old, better fixed rate; if rates fall, it lets the swaption expire and takes the better market rate instead. It's optional protection on a rate decision that hasn't happened yet.

3

Who's actually doing this

Corporates hedging anticipated future borrowing, and banks managing the optionality embedded in things like mortgages — where a borrower can prepay, which behaves like an option the bank is short.

The exercise style usually mirrors how the real-world decision actually gets made: a single moment, any time, or a handful of fixed dates.

Payer swaption: right to pay fixed Receiver swaption: right to receive fixed Exercise: European, American or Bermudan Premium paid upfront for the right