Finance term
Interest Rate Swap
Also known as: IRS, fixed-for-floating swap, plain vanilla swap
Definition
An interest rate swap is a derivatives contract in which two counterparties exchange interest payment streams on a notional principal amount — typically one party pays a fixed rate while the other pays a floating rate (e.g., SOFR) — governed by the ISDA Master Agreement. Used by businesses to convert variable-rate debt exposure to fixed, or vice versa.
Detailed explanation
Interest rate swaps are the most widely traded over-the-counter (OTC) derivatives instrument. In a standard 'plain vanilla' fixed-for-floating swap, Party A agrees to pay Party B a fixed interest rate on a notional amount; Party B pays Party A a floating rate (historically LIBOR, now SOFR — Secured Overnight Financing Rate — following the LIBOR transition per Federal Reserve guidance at https://www.federalreserve.gov/releases/h15/). No principal changes hands — only the net difference in interest payments is settled.
The ISDA Master Agreement (International Swaps and Derivatives Association) is the governing legal framework for the vast majority of swap contracts globally. It standardizes termination events, netting provisions, and credit support annexes. The Federal Reserve's supervisory framework for derivatives counterparty risk applies to bank swap dealers (https://www.federalreserve.gov/supervisionreg/topics/derivatives.htm).
For businesses, interest rate swaps are a hedge tool. A company with a floating-rate SBA loan or commercial real estate loan can enter a swap to receive floating and pay fixed — effectively locking in a fixed cost of debt without refinancing. Conversely, a company with fixed-rate debt that expects rates to fall can swap to floating to capture the decline. Swap effectiveness is measured against the hedged item; accounting treatment follows FASB ASC 815 (Derivatives and Hedging).
◈ Worked example
- Company borrows $5M at SOFR + 2.5% (floating). Enters swap: pays 6.5% fixed / receives SOFR + 2.5% floating. Net result: fixed 6.5% cost regardless of rate moves.
- Bank issues $10M commercial real estate loan at 5% fixed. Enters a receive-fixed / pay-floating swap to convert balance-sheet exposure to floating — matching SOFR-linked funding costs.
- SOFR as of Q2 2026 ≈ 4.3%. A 3-year swap at 5.5% fixed vs. SOFR + 1.2% floating: the fixed payer breaks even if SOFR averages ≥ 4.3% over the term.
Common questions
The most-asked questions about Interest Rate Swap — answered straightforwardly.
What is the ISDA Master Agreement? +
The ISDA Master Agreement is the standard bilateral contract framework published by the International Swaps and Derivatives Association that governs OTC derivatives transactions between two counterparties. It defines close-out netting (offsetting obligations in default), events of default, termination rights, and credit support requirements. Most banks and institutional counterparties require a signed ISDA before executing any swap.
What is the difference between an interest rate swap and a cap or floor? +
A swap exchanges fixed cash flows for floating (or vice versa) — both parties have an obligation regardless of rate direction. An interest rate cap gives the buyer the right (not obligation) to receive payment when rates exceed the strike rate, acting as an insurance ceiling. A floor guarantees a minimum rate. Caps and floors are options; swaps are bilateral commitments.
Do small businesses use interest rate swaps? +
Occasionally, for large commercial real estate loans or significant floating-rate term debt. Banks sometimes require swap agreements as a condition of floating-rate commercial real estate loans above $5M. For most small businesses, the complexity and ISDA documentation cost is prohibitive — a fixed-rate refinance is simpler than maintaining a swap. Larger middle-market businesses with $10M+ in floating-rate debt benefit most from swaps.
Further reading
This glossary entry is educational content. ClearValue Lending is a business & personal financing platform — not a lender, broker, or financial advisor. Specific product terms vary by lender; verify with the lender or issuer before applying. See privacy policy.