An interest rate swap is a derivative where two parties exchange interest payment streams on a notional principal — typically one paying a fixed rate and the other a floating rate — without exchanging the principal itself.
Why It Matters
Interest rate swaps are the largest derivatives market in the world by notional outstanding, and they're the primary tool corporates and banks use to manage rate exposure — a company with floating-rate debt worried about rising rates can swap into a fixed obligation without refinancing the underlying loan.
How It Works in Practice
- 1Two counterparties agree on a notional amount, a fixed rate, a floating rate benchmark (increasingly SOFR since LIBOR's phase-out), and a term
- 2On each payment date, only the net difference between the fixed and floating amounts changes hands
- 3The swap's value fluctuates with interest rate expectations after execution, generating mark-to-market gains or losses for both sides
- 4Swaps are now largely centrally cleared post-2008 reforms, reducing bilateral counterparty risk
Common Pitfalls
A swap changes interest rate exposure but doesn't eliminate the underlying credit or refinancing risk of the original loan
Mismatches between the swap's floating leg and the actual benchmark on a company's debt (basis risk) can leave a supposedly 'hedged' position still exposed
Early termination of a swap when rates have moved against you can trigger a large cash settlement