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GLOSSARYTERMS AS A CREDIT DESK USES THEM

Interest rate swap

What does an interest rate swap do for a borrower?

ONE OF 80 TERMS · FREE · NO SIGNUP

BY MICHAEL SHANG · SIXTEEN YEARS IN COMMERCIAL BANKING · UPDATED

// THE SHORT ANSWER

An interest rate swap is a contract in which a borrower with a floating-rate loan agrees to pay a fixed rate and receive the floating base rate back, so that the base rate on the loan is cancelled out and the loan behaves as if it were fixed. The lending margin is not part of the swap and stays on top. If the base rate falls, the swap costs the borrower the difference; if it rises, the swap pays it. The hedge fits only while the loan it was written against is still there, which is why a loan repaid early leaves a swap to be unwound at a cost.

BASIS  Practitioner judgment from sixteen years in commercial banking, set out in How Bankers Think (Highbank Press, 2026). Every borrower on this site is a composite constructed for teaching, not a client. The market is mid-market commercial lending as practised in New Zealand and Australia; where a convention differs elsewhere, the page says so.

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