Floating vs fixed-rate debt
The interest rate environment shapes the stability of a company's debt burden more than most investors realize. When a business borrows, it chooses between fixed rates—locked in today, predictable for years—and floating rates that reset with market interest rates. That choice cascades through cash flows, solvency, and risk. A company that borrows entirely on floating rates in a rising-rate environment faces shrinking margins and stretched debt ratios. A company locked into expensive fixed debt may miss the tailwind when rates fall. As a fundamental analyst, understanding this distinction separates sound solvency assessment from naive leverage ratios.
Quick definition: Fixed-rate debt carries an interest rate locked in at origination; floating-rate debt has a rate that adjusts periodically (often quarterly or semi-annually) based on a reference rate such as SOFR or LIBOR plus a spread. Fixed rates protect the borrower from rising rates; floating rates expose cash flows to interest-rate risk.
Key takeaways
- Fixed-rate debt locks in the cost of borrowing today, insulating the company from future rate increases but potentially overpaying if rates fall.
- Floating-rate debt varies with market conditions, offering lower initial rates but exposing the company to cash-flow volatility and refinancing risk.
- The composition of fixed vs floating debt shapes how sensitive a company's profitability and solvency ratios are to interest-rate changes.
- In low-rate environments, floating-rate borrowing is cheaper; in high-rate environments, fixed rates provide certainty and protect margins.
- Investors must assess whether the company's floating-rate exposure is sustainable if rates move 2–3% higher or whether the balance sheet becomes distressed.
Fixed-rate debt: the certainty premium
A company that issues a 10-year bond at 4.5% will pay exactly 4.5% for the full decade, regardless of what market rates do. This creates predictability. Interest expense is fixed; the company can forecast cash interest payments years in advance. Lenders demand a premium for this certainty—fixed rates are typically higher than the floating rates available on the same day of issuance.
The solvency benefit is clear: fixed-rate debt decouples the company from rate risk. If the company borrows at 4.5% fixed and rates spike to 8%, the company's interest expense does not increase. The company's leverage ratios remain stable. Debt-to-EBITDA, interest coverage, and cash-flow forecasts do not surprise on the upside.
But fixed rates come with their own trap: anchoring. If market rates fall to 2.5%, the company is still paying 4.5%. The competition pays less. Refinancing the debt early often comes with penalties. The company has overpaid for the certainty, and that certainty becomes costly.
Fixed-rate debt also assumes the company survives. If rates spike and the company cannot service the debt, the locked-in rate offers no protection—the company defaults regardless. Fixed rates do not prevent insolvency; they only reduce volatility in the path to it.
Floating-rate debt: the leverage accelerator in rising rates
Floating-rate debt typically starts cheap. A company might borrow at SOFR + 2%, and if SOFR is 1%, the all-in rate is 3%—two percentage points less than a fixed-rate alternative. This attracts borrowers and enables higher leverage than would be sustainable on fixed rates.
The trade-off surfaces when rates rise. If SOFR climbs to 5%, the floating rate becomes 7%. The company's interest expense jumps by 4 percentage points. On $500 million of floating debt, that is a $20 million annual hit to cash flow—a swing that can swing solvency ratios from safe to distressed.
The leverage accelerator effect is the real danger. A company with 50% of debt on floating rates will see its interest coverage ratio compress rapidly if rates rise 2% or more. Investors must stress-test the balance sheet. If the company has $1 billion of debt, $500 million floating, and EBITDA of $200 million:
- At current rates (SOFR 4.5%), interest expense might be $35 million, giving interest coverage of 5.7×.
- If SOFR rises to 6.5%, floating-rate interest rises by $10 million, pushing total interest to $45 million and coverage down to 4.4×.
- If SOFR reaches 7.5%, coverage falls to 3.7×—a zone where credit stress begins.
This is not theoretical. During the 2022–2023 rate-hiking cycle, companies with high floating-rate exposure saw credit spreads widen sharply. Refinancing costs soared. Some faced covenant violations as interest coverage tightened.
The debt maturity profile and refinancing ladder
Most companies do not have all debt on a single rate type or maturity. Instead, they build a refinancing ladder—debt maturities spread across years—and allocate portions to fixed and floating rates.
A typical industrial company might have:
- 40% on fixed rates, locked for 5 years at 3.8%
- 30% on floating rates, reset quarterly, currently at SOFR + 2.1% (5.1%)
- 20% on a credit facility (mostly undrawn), floating
- 10% on a term loan, fixed for 7 years at 4.2%
This mixed approach hedges somewhat: the fixed portion protects from rate spikes, the floating portion gives flexibility and lower near-term costs. But the mix also means the company cannot know its total interest expense more than a few years out.
The solvency test must account for refinancing. When floating-rate debt matures, the company must either refinance at whatever the new rate is or repay from cash. If rates have risen sharply, refinancing costs jump. If the credit markets freeze (as in 2008), even a solvent company may struggle to refinance at any price.
Investors should ask: If rates rise 200 basis points and the company needs to refinance 30% of its debt, can it absorb the higher cost? Or does the balance sheet snap?
Stress-testing solvency under rate scenarios
The proper way to assess floating-rate exposure is scenario analysis. Calculate interest expense and solvency metrics under three rate scenarios:
- Base case: Current rate expectations (e.g., SOFR at 4.5%).
- Upside scenario: Rates 200 basis points higher (SOFR at 6.5%).
- Downside scenario: Rates 200 basis points lower (SOFR at 2.5%).
For each scenario, recompute:
- Total interest expense
- Interest coverage ratio
- Debt-to-EBITDA
- Free cash flow after interest
Companies with high floating-rate exposure will show material deterioration in solvency metrics in the upside scenario. This is not a reason to avoid the company, but it is a reason to pay a discount to a peer with more fixed-rate debt.
A company in a stable, low-cyclicality industry with steady cash flows can tolerate 50% floating-rate debt. A company in a cyclical business, where EBITDA swings with the economy, should prefer fixed-rate debt to avoid a dual squeeze: falling EBITDA coinciding with rising interest expense.
Interest-rate derivatives and hedging
Sophisticated companies hedge floating-rate exposure using interest-rate swaps. A swap converts floating-rate debt into synthetic fixed-rate debt without refinancing. The company pays a fixed rate to a counterparty and receives the floating rate in return, locking in the all-in cost.
Swaps are not free—they come with a cost and a counterparty credit risk—but they allow companies to enjoy the lower upfront rates of floating debt while capping interest-rate risk. When reading the footnotes in the 10-K, look for the company's swap portfolio. If the company has $500 million of floating debt but has swapped 80% of it into fixed rates, the solvency profile is much more defensive than the raw debt schedule suggests.
Conversely, a company with $500 million of floating debt and no hedges is taking a full rate bet. If the CFO and the board have consciously chosen not to hedge, it suggests confidence in the rate outlook—or overconfidence.
Real-world examples
Apple Inc. maintains a diversified debt portfolio. As of fiscal 2024, Apple has issued bonds across multiple maturities and rate types. The company has some floating-rate commercial paper but predominantly locks in fixed rates for long-term debt. This is rational: Apple's investment-grade credit quality gives it access to cheap fixed financing, and its massive cash generation can weather rate spikes. Locking in rates removes a source of earnings volatility.
Highly leveraged private equity deals often rely heavily on floating-rate bank debt. A PE-backed company might have $500 million of floating-rate term loans (at high LBO spreads, e.g., SOFR + 4.5%) plus $200 million of fixed-rate bonds. The floating portion is cheap at origination but becomes a stranglehold if rates rise. Many PE deals from 2020–2021 found themselves underwater when rates spiked in 2022. Refinancing became prohibitively expensive, and some companies were forced into asset sales or restructurings.
Mortgage REITs (real estate investment trusts) are inherently maturity and rate mismatches—they borrow on floating rates and lend (or invest in mortgages) on fixed rates. They manage this via hedging swaps and dynamic rebalancing. But when rate volatility spikes suddenly, hedges become imperfect and capital can evaporate. The 2022 downturn in mortgage REITs illustrated this risk vividly.
Common mistakes
Mistake 1: Ignoring floating-rate exposure. Many investors focus on debt-to-EBITDA without asking what portion is floating. A company with 6× debt-to-EBITDA on 80% floating rates is riskier than a peer with 7× on 100% fixed rates, because the first company's effective leverage balloons if rates rise.
Mistake 2: Assuming rates will stay low forever. In 2020, fixed rates were 2–3%; floating rates were even lower. Many companies took on floating-rate debt, reasoning that refinancing at 3–4% in the future would be painless. When rates spiked to 5–6%, those assumptions broke down. Always stress-test higher.
Mistake 3: Conflating swap hedges with risk elimination. Hedges reduce risk but introduce counterparty risk and cost. A company hedging 90% of floating debt is safer than one with no hedge, but it is not risk-free. If the counterparty is a distressed bank, the hedge itself becomes a liability.
Mistake 4: Overlooking off-balance-sheet floating-rate exposure. Some companies have floating-rate obligations embedded in operating leases, pension obligations, or contingent payments in earnouts. The 10-K footnotes may list these separately, but they are real cash drains if rates rise.
Mistake 5: Not adjusting valuation for rate scenarios. If you are valuing a company with 50% floating-rate debt, your base-case DCF should use a WACC that reflects the current rate environment, and you should run sensitivity analysis on the discount rate. A 1% shift in rates can change the enterprise value by 10%+ for companies with high floating-rate exposure.
FAQ
Q: Is floating-rate debt always riskier than fixed-rate debt?
A: Not always. Floating-rate debt is riskier in a rising-rate environment and cheaper in a stable or falling-rate environment. It depends on the rate forecast and the company's ability to absorb payment shocks. A stable utility with predictable cash flows can manage floating debt more easily than a cyclical manufacturer.
Q: What is SOFR, and why is it important?
A: SOFR (Secured Overnight Financing Rate) is the Federal Reserve's replacement for LIBOR. Most new floating-rate debt is priced as SOFR plus a spread (e.g., SOFR + 2.5%). SOFR moves with Fed policy and money-market rates. Understanding the SOFR path is critical for forecasting floating-rate interest expense.
Q: Can a company refinance floating-rate debt into fixed rates if rates spike?
A: Yes, but only if credit markets are functioning and the company's credit quality allows it. In a stressed market, a company with deteriorating fundamentals may find refinancing impossible or prohibitively expensive. The key is not to wait until you need to refinance; lock in fixed rates before conditions tighten.
Q: How much floating-rate debt is acceptable?
A: It depends on the industry and business stability. A stable utility can handle 40–50% floating. A cyclical company should target 20–30% or less. A highly leveraged company should minimize floating debt, because leverage already amplifies the impact of falling EBITDA. General rule: the more volatile the business, the lower the floating-rate exposure should be.
Q: What is a basis point, and how does it affect interest expense?
A: A basis point is 1/100th of a percent. If rates rise 100 basis points (1%), a company with $1 billion of floating debt will see interest expense rise by $10 million annually. For a company with 4× debt-to-EBITDA and thin margins, a 100-bps move can trigger covenant violations.
Q: Should investors prefer companies with fixed-rate debt or floating-rate debt?
A: It depends on the rate outlook and valuation. If you believe rates will rise, fixed-rate debt is preferable. If you believe rates will fall or stay flat, floating-rate debt is cheaper and more attractive. Most prudent investors prefer a mix—some fixed for protection, some floating for optionality.
Related concepts
- Interest coverage ratio: The ability to pay interest from operating cash flow; tightens dramatically with floating-rate exposure in rising-rate environments.
- Debt maturity profile: The schedule of debt repayment and refinancing; critical for understanding when the company faces refinancing risk.
- Weighted average cost of capital (WACC): The blended cost of debt and equity; shifts with interest-rate changes and affects valuation.
- Credit spreads: The premium lenders demand above a risk-free rate; widen for companies with floating-rate exposure if rates spike and leverage tightens.
- Hedging and derivatives: Interest-rate swaps and other tools companies use to lock in costs; reduce but do not eliminate rate risk.
Summary
Floating-rate debt is cheaper upfront but riskier if rates rise; fixed-rate debt locks in cost but may overpay if rates fall. The composition of a company's debt portfolio—how much is fixed versus floating—materially affects solvency under different interest-rate scenarios. Investors must stress-test the balance sheet, asking: What happens to interest coverage and leverage ratios if rates rise 200 basis points? Companies with high floating-rate exposure are implicitly betting on stable or falling rates; if that bet fails, solvency deteriorates rapidly. The safest companies hedge floating debt via interest-rate swaps or maintain a diversified maturity and rate ladder. When evaluating leverage, always ask not just how much debt the company has, but how much of it reprices with the market.