Take a fictional £100 bond paying £4 a year. Its coupon rate is 4%. Now let its market price fall to £80. The annual payment is still £4, but £4 divided by £80 is 5%. One payment, two percentages. The denominator changes the story.
That difference matters beyond the bond market. A higher yield on an existing company bond does not automatically increase the company’s next coupon payment. Nor does a lower yield immediately reduce its interest expense. The contract, the next refinancing date and any interest-rate swaps sit between the market headline and the business’s cash bill.
Fact: the coupon starts with face value
A conventional fixed-rate bond promises payments calculated from its face value, subject to the issuer meeting its obligations. Our fictional bond’s £4 annual coupon comes from £100 multiplied by 4%. A later buyer paying £80 does not rewrite that calculation. The SEC’s corporate-bond guide distinguishes face value, trading price, coupon and yield, and explains that bonds can trade above or below face value.
The buyer’s current yield uses the price paid instead: £4 divided by £80. It describes annual coupon income relative to that price. It leaves out the difference between purchase price and eventual repayment. 4% and 5% answer different questions, even before anything changes in the borrower’s business.
Hypothetical example · annual payments
The payment stays £4
Face value
4% coupon rate
Purchase price
20% below face value
Current yield
£4 ÷ £80
Fact: maturity adds another part of the return
Yield to maturity includes the timing of coupons and the repayment at maturity. It is the discount rate that makes those promised payments equal the bond’s price, as the Federal Reserve Bank of St Louis explains. For our £80 purchase, receiving £100 at maturity would add something that the 5% current yield misses. The maturity date is needed before calculating the full yield.
That calculation assumes the promised payments arrive. It is not a guarantee of realised return. Early sale, default, transaction costs and the rate available when coupons are reinvested can change the result. Callable bonds also need a separate check: the issuer may repay early under the contract. NASD’s corporate-bond explanation, hosted by FINRA, sets out yield-to-maturity and yield-to-call calculations. The distinction remains useful; this is not a claim about a new regulatory rule.
Interpretation: a market yield is not the issuer’s whole bill
If investors trade that fictional bond between themselves at £80, the issuer does not receive another £80. Its existing fixed coupon remains £4. A changed secondary-market yield can signal the terms investors might demand for new borrowing, but it does not replace the existing contract.
For a business, the relevant comparison is between the cost of debt being replaced and the cost of the replacement, including fees and hedging. A lower market yield can still leave refinancing more expensive than an old, unusually cheap loan. Conversely, a higher yield than last month need not mean a higher cost than the particular debt maturing now. The baseline matters as much as the direction.
Who could benefit?
Fact: McDonald’s Corporation (NYSE: MCD) discloses in its June 2026 quarterly filing that swaps effectively converted a portion of fixed-rate debt to floating rates. The reported equivalent notional amount was $488 million, including a $12 million decrease from cumulative hedging adjustments. It is a specifically defined exposure, not the company’s total debt.
Interpretation: A decline in the relevant floating benchmark could reduce payments on that exposed portion, depending on reset dates and swap terms. The effect can arrive sooner than a fixed-rate bond’s maturity. Its importance to group earnings depends on the exposed amount, other financing costs and operating results. A lower yield on a different bond is insufficient evidence of that saving.
Fact: PepsiCo, Inc. (Nasdaq: PEP) reported that approximately 15% of total debt was subject to variable rates after related swaps on 5 September 2026, against approximately 11% at its December 2025 year end, in its September quarterly filing.
Interpretation: That variable-rate portion creates a channel for lower relevant rates to help financing cash costs over subsequent reset periods. It also limits the claim: a change in a benchmark does not reprice all debt, and those percentages do not supply a net-earnings forecast. New borrowing, currencies and hedges can change the exposure.
Who’s at risk?
Fact: The Coca-Cola Company (NYSE: KO) describes interest-rate and cross-currency swaps used to hedge fixed-rate and foreign-currency debt in its July 2026 quarterly filing. A coupon list alone therefore cannot describe the entire financing position.
Interpretation: Coca-Cola, McDonald’s and PepsiCo could face higher cash costs when debt is replaced at an effective cost above the retiring debt’s cost. Floating exposures can transmit increases sooner; hedges can change or defer the effect. The horizon runs from contractual reset dates to future maturities. Materiality requires the amount being repriced and the rest of the business’s cash generation, not just a yield chart. New funding disclosures, debt repayments or changed hedges could alter this assessment. None of these filings establishes a current financing crisis.
There is a useful limit to the comparison between these three issuers. Their disclosure dates differ, and one reports a percentage while another reports a defined swap exposure in dollars. Those are not comparable rankings of rate sensitivity. Converting them into a league table would require a common reporting date, matching debt definitions and the relevant contractual details. The examples establish that payment structures differ; they do not establish which company gains most from the next market move.
Speculation: the next rate is still unknown
Lower future benchmark rates, narrower credit spreads or easier refinancing are scenarios, not findings here. The opposite paths remain possible. No probability or share-price outcome follows from this arithmetic. The practical reading habit is narrower: identify which yield a headline uses, then match the company’s actual payment obligation to its reset or maturity date.
This article explains financial measures and conditional business exposures. It provides no personalised investment recommendation. Company disclosures are dated historical examples, not current bond quotations.
Photo by Jakub Zerdzicki on Pexels. Financial paperwork and a calculator on a desk.