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Coupon Rate vs Yield to Maturity: The Key Difference

Close-up of Australian dollar coins
Illustrative stock photo: Pexels · Free-use licence

Legally Insightful · Australian explainer

Quick answer: A bond’s coupon rate describes its contractual interest against face value. Yield to maturity is an estimate of the annualised return from the bond’s remaining payments and maturity amount at today’s price, subject to assumptions including payment as promised.

Why the advertised coupon is not your return

A 5% coupon on $10,000 face value is $500 each year if paid annually. Buying that bond for $10,600 does not create $530 of annual interest; the annual coupon remains $500. You also face a difference between the purchase price and maturity amount.

Likewise, buying below face value can increase the yield because the investor receives the coupon plus a potential uplift to face value at maturity. Brokerage, accrued interest, taxes and the timing of cash flows can change the investor’s actual net outcome.

Yield to maturity uses all promised cash flows

Yield to maturity is the discount rate that equates the purchase price with the present value of expected remaining coupons and redemption proceeds. That makes it useful for comparing bonds with different prices and coupon structures.

However, the calculation normally assumes the bond is held to maturity and the issuer meets payments. It may rely on a particular convention about reinvesting coupons. For a callable bond, yield to an earlier possible call date may also matter.

How to compare two offers fairly

Compare yields for similar currency, credit quality, maturity, seniority and liquidity. A higher yield can reflect higher risk rather than a bargain. Make sure quoted prices are consistently clean or dirty prices and include transaction costs.

Avoid comparing a fixed coupon with a floating rate’s temporary current coupon as though both were locked in for the same period. Ask how the quoted yield was calculated and whether it includes a call assumption.

A practical example

A bond with $10,000 face value paying $500 a year has a 5% coupon. If purchased above face value, the investor pays more than the amount normally repaid at maturity, reducing yield. If bought below face value, the eventual redemption difference can add to return—assuming the issuer pays in full.

Frequently asked questions

Can yield to maturity change after I buy?

The market-quoted yield can change with the trading price. The cash flows you contracted for generally do not change on a plain fixed-rate bond.

Is a high coupon better than a high yield?

Neither figure is enough alone. Compare the price, timing, credit risk, optional redemption features and total expected cash flows.

Further reading from official sources

Related Legally Insightful guides

  • What Is a Bond? A Beginner’s Guide for Australians
  • Why Bond Prices Fall When Interest Rates Rise
  • Bond ETFs vs Individual Bonds: What Changes?

Important: This article is general educational information about Australian law or financial concepts, not financial, legal or tax advice for your circumstances. Terms, product documents and rules can change. Confirm details with the relevant provider or authority and seek qualified advice where appropriate.

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