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Variable-Rate Bond

August 31, 2024 Fixed Income

A variable-rate bond has a coupon that resets periodically, changing interest income while preserving issuer, liquidity, and structure risk.

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A variable-rate bond is a bond whose coupon resets periodically using a reference rate, formula, auction, or remarketing process. The reset feature can make its price less sensitive to broad rate moves than a comparable fixed-rate bond, but the bond still has issuer, liquidity, tax, and structure risk.

Key Takeaways

Variable-rate bonds change coupon income over time; fixed-rate bonds keep the same coupon unless another feature applies.
The reset mechanism can be benchmark-based, formula-based, auction-based, or remarketed.
Rate resets can lower duration, but they do not guarantee par value, repayment, or liquidity.
Documentation matters: caps, floors, call features, tender rights, tax status, and fallback language can change the economics.

How It Works

\text{Next Coupon Rate} = \text{Reset Rate} + \text{Spread or Margin}

If a bond resets every 90 days at a short-term benchmark plus 1.00%, and the benchmark moves from 3.50% to 4.25%, the next coupon period may use 5.25% before caps, floors, day-count conventions, and issuer-specific terms. If issuer credit weakens, the bond price can still decline.

Variable-Rate Bond vs. Fixed-Rate Bond

Feature	Variable-Rate Bond	Fixed-Rate Bond
Coupon	Resets by formula or process.	Stays fixed.
Income	Changes with reset rate.	More predictable if issuer performs.
Rate sensitivity	Usually lower between reset dates.	Usually higher for comparable maturity.
Main review point	Reset terms, benchmark, liquidity, and support.	Duration, yield, call risk, and credit spread.
Risk that remains	Credit, liquidity, tax, call, and structure risk.	Credit, liquidity, tax, call, and reinvestment risk.

Practical Example

A city issues a variable-rate bond with weekly resets and an optional tender feature. The weekly rate may keep the bond near par in normal conditions, but the investor still needs to review the municipal issuer, remarketing agent, liquidity provider, tax status, and what happens if the tender or support arrangement changes.

Common Mistakes

Assuming a variable-rate bond cannot trade below par.
Ignoring the issuer because the coupon resets.
Comparing yield without checking tax treatment and liquidity.
Treating auction-based, formula-based, and remarketed bonds as identical.
Forgetting that caps can limit income in rising-rate environments.

Public Source Checks

MSRB Interest Payments explains fixed-rate and variable-rate municipal interest structures, including VRDOs and auction-rate securities.
Investor.gov municipal bonds gives municipal bond context and tax/risk reminders.
FINRA bond due diligence outlines bond review items such as maturity, yield, call status, tax treatment, and credit rating.

Variable-Rate Security: The broader category.
Variable-Rate Demand Bond: A variable-rate bond with a demand or tender feature.
Bond Yield: Yield must be interpreted with reset terms.
Liquidity: Sale liquidity can differ from reset mechanics.
Credit Risk: Issuer repayment capacity remains central.

FAQs

Does a variable-rate bond eliminate interest-rate risk?

No. It may reduce fixed-rate duration, but reset timing, caps, floors, credit spreads, and liquidity can still affect value.

Why would an issuer sell a variable-rate bond?

An issuer may use variable-rate debt to match short-term funding conditions or seek lower initial interest costs, but it accepts reset and market-access risk.

Revised on Sunday, June 21, 2026

Variable-Rate Demand Bond