Interest rate swaps: trading fixed for floating

Interest rate swaps are a common but often misunderstood tool in the bond and lending world. This guide explains what an interest rate swap is, how the fixed-for-floating exchange works and why institutions use them.

Quick answer

An interest rate swap is an agreement between two parties to exchange interest payments on a set amount, usually one paying a fixed rate and the other a floating rate that moves with the market. Interest rate swaps are used to manage the risk of changing interest rates, not to exchange the underlying principal itself.

Key takeaways

• An interest rate swap exchanges interest payments between two parties.
• Usually one side pays fixed and the other pays floating.
• Only the interest is exchanged, not the principal.
• They are used to manage interest rate risk.
• They are mainly used by institutions, not retail investors.

What is an interest rate swap?

An interest rate swap is a contract between two parties to exchange interest payments on an agreed amount, called the notional amount. Typically, one party agrees to pay a fixed rate while the other pays a floating rate that changes with the market.

Importantly, the notional amount itself is not swapped. It is only used to work out the interest payments. So a swap is really about exchanging the pattern of interest, fixed for floating, over a period.

How does it work?

Imagine one party has borrowing on a floating rate and worries that rates will rise. It can enter a swap to receive floating and pay fixed. That way, its floating costs are offset by the floating it receives, leaving it effectively paying a fixed rate.

The other party might prefer the opposite. Each side takes on the payment pattern that suits its needs, and the two exchange the difference in payments on set dates.

Why do institutions use swaps?

The main reason is to manage interest rate risk. A company or bank exposed to changing rates can use a swap to make its costs more predictable, or to match its income and expenses more closely.

Swaps let each side reshape its exposure without having to renegotiate the underlying loans or bonds. This flexibility is why they are widely used in professional finance.

What are the risks?

Swaps carry risks. If rates move against the position, one side ends up worse off than if it had done nothing. There is also counterparty risk, the chance that the other party fails to make its payments.

Because of this, swaps are complex instruments mainly used by banks, large companies and institutions with the expertise to manage them, rather than everyday retail investors.

Why should everyday investors know about them?

Even if you never use a swap, they shape the financial system around you. Swap rates are watched as a signal of where the market expects interest rates to head, which links to bond yields and borrowing costs.

Understanding swaps helps you make sense of financial news about rate expectations. Any investment decision should be your own after proper research and reading all related documents.

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