Yield to Call vs Yield to Maturity: What Callable Bond Investors Need to Know

When you buy a callable bond, you face a hidden asymmetry: if interest rates fall, the issuer will almost certainly redeem the bond early at the call price, capping your upside. This is why bond investors track two yields—yield to call and yield to maturity—and rely on the lower of the two as the realistic return estimate.

What Makes a Bond Callable?

A callable bond gives the issuer the right to redeem it before maturity, usually at a predetermined price (the call price). Corporate bonds, many municipal bonds, and mortgage-backed securities often include call provisions.

The issuer’s incentive is straightforward: if interest rates fall, issuing new debt becomes cheaper. The company can call in the old high-coupon bond and refinance at a lower rate, trimming its cost of debt. From the issuer’s standpoint, a call option is valuable. From the investor’s, it’s a headwind.

The Yield-to-Maturity Illusion

When you buy a bond, you often see a single yield number quoted: the yield to maturity. This is the internal rate of return assuming you hold the bond until its final maturity date and reinvest all coupon payments at that same yield. For a non-callable bond, YTM is a reliable number.

For a callable bond, YTM is misleading. It assumes the issuer will never exercise the call option—which is exactly what happens when rates rise. But in the most common scenario (falling rates), the assumption breaks down. The issuer will call the bond, and you won’t hold it to maturity.

Example: A corporate bond maturing in 30 years, callable after 5 years, has a coupon of 6%. If interest rates have fallen and new bonds yield 4%, the YTM might show as 5.8%, inviting the investor to imagine nearly three decades of 5.8% returns. But the issuer will almost certainly call the bond in year 5.

Calculating Yield to Call

Yield to call measures the return if the issuer calls the bond on the earliest call date. The calculation is identical to YTM, except:

• The final payment is the call price (not the par value at maturity), and
• The holding period ends on the call date, not the maturity date.

Formally:

Bond Price = (Coupon / (1 + YTC)^1) + (Coupon / (1 + YTC)^2) + … + ((Coupon + Call Price) / (1 + YTC)^n)

where n is the number of periods until the call date.

Let’s work an example:

• Par value: $1,000
• Coupon: 6% (annual payment: $60)
• Call price: $1,050
• Years to earliest call: 5
• Current price: $1,100 (trading at a premium)

To find YTC, we solve for the discount rate that makes the present value of five years of $60 coupons plus the $1,050 call price equal to $1,100:

$1,100 = $60/(1+YTC) + $60/(1+YTC)² + … + ($60 + $1,050)/(1+YTC)⁵

YTC works out to roughly 4.5%. Meanwhile, if we calculate YTM (ignoring the call and assuming maturity in 20 years, with a final payment of $1,000), we might get 5.2%.

The investor should assume a 4.5% return, not 5.2%.

Why the Lower Yield Matters

When a bond trades at a premium (above par), the bond has a coupon higher than current market rates. Falling rates make premiums bigger and make calling more likely. In this scenario, YTC will be lower than YTM.

When a bond trades at a discount (below par), the bond has a coupon lower than market rates. Falling rates shrink discounts. In this case, YTC and YTM converge, and the call is less likely to happen.

The rule of thumb: if rates are falling and the bond is trading at a premium, use yield to call as your return estimate. If rates are rising or stable and the bond trades at par or a discount, YTM is more useful.

The Investor’s Dilemma

By tracking yield to call, you’re acknowledging a painful trade-off. If you buy a bond paying 6% and rates fall to 4%, two things happen:

1. The bond’s price rises sharply (good for you).
2. The issuer calls it, and you must reinvest the proceeds at 4% (bad for you).

You lock in the low reinvestment rate, losing the opportunity to pocket the full price appreciation. This is call risk—the asymmetry that investors must accept in exchange for higher coupon payments.

Comparing the Two Yields: A Practical Example

See also