Interest Rate Caps, Floors and Swaptions

Three different rights

A cap can make payments when a reference rate exceeds an agreed strike on specified dates. A floor can pay when the rate falls below its strike. A swaption gives the right to enter an interest rate swap, or receive a financial settlement under the contract.

A cap is generally a series of options for successive rate periods, rather than one stock-style call. An institution choosing between these structures needs to match the underlying exposure and payment dates.

A single cap-period example

Suppose a hypothetical cap covers $1 million for a quarter using a 0.25 year fraction and a 5% strike. If the specified reference rate fixes at 6%, the period payment is $1,000,000 × (6% − 5%) × 0.25 = $2,500. At or below 5%, that period pays zero.

If a standalone option for this one period cost $1,000, the net result would be $1,500 before other costs. An actual multi-period cap has one premium covering several possible payments; do not subtract its entire premium separately from every period. Day-count and payment conventions come from the confirmation.

Choosing a swaption direction

A payer swaption gives the right to enter a swap paying fixed and receiving floating. A receiver swaption gives the opposite right. Whether a cash payment or a swap position results depends on the agreed settlement.

The swap start date, tenor and notional can matter as much as the option expiry. These terms should be examined separately.

Hedge fit and counterparty terms

A reference rate or reset-date mismatch can leave a borrowing exposure incompletely hedged. Premiums, early termination values, collateral and counterparty credit terms affect the cost and risk.

Dealer availability is not universal retail access. Compare the confirmation with the actual borrowing or investment cash flows. For standardized futures examples, return to Interest Rate Options.

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