A floating rate is an interest rate that changes over time according to a formula tied to a benchmark or reference rate. In fixed income, a floating-rate coupon usually equals a reference rate plus or minus a stated spread.
Key Takeaways
- Floating rate means the coupon can reset; it does not mean the investment is risk-free or always stable.
- The reset formula, reference rate, spread, reset frequency, caps, floors, and fallback language all matter.
- Floating-rate securities usually have lower fixed-rate duration than comparable fixed-rate bonds, but they still carry credit, liquidity, benchmark, and spread risk.
- Legacy references to LIBOR require careful review because many markets have moved to alternative reference rates such as SOFR.
$$
\text{Floating Coupon Rate} = \text{Reference Rate} + \text{Spread}
$$
If a note pays SOFR plus 0.75%, and the applicable SOFR-based rate for the reset period is 4.50%, the coupon rate for that period is 5.25%, before considering day-count conventions, caps, floors, and issuer-specific terms.
Where Floating Rates Appear
| Instrument | How The Floating Rate Is Used |
|---|
| Floating-rate note | Coupon resets against a benchmark plus a spread. |
| Bank loan | Borrower rate resets with a reference rate and margin. |
| Adjustable-rate mortgage | Mortgage rate adjusts under contract terms. |
| Interest-rate swap | One leg may pay a floating benchmark rate. |
| Variable-rate demand security | Rate may reset through remarketing or demand features. |
Why It Matters
Floating rates shift some interest-rate risk from the holder to the issuer because the coupon adjusts as rates change. That can reduce price sensitivity to broad rate moves, but the investor still needs to evaluate the issuer’s credit quality, the spread, reset lag, liquidity, and whether the reference rate matches the investor’s funding or reinvestment risk.
Common Mistakes
- Assuming floating-rate instruments cannot lose value.
- Looking only at today’s coupon and ignoring future reset dates.
- Ignoring caps, floors, and call features.
- Treating all benchmark rates as interchangeable.
- Failing to check fallback language for discontinued or changed reference rates.
Public Source Checks
FAQs
What is a floating rate in simple terms?
It is an interest rate that changes by formula, usually based on a benchmark rate plus a stated spread.
Does a floating rate protect against all rate risk?
No. It can reduce fixed-rate price sensitivity, but reset lag, caps, floors, spread changes, credit risk, and liquidity can still affect value.
Is LIBOR still the standard benchmark for floating rates?
Many legacy contracts referenced LIBOR, but new and amended contracts often use alternative reference rates. Always check the document and fallback language.