Understanding the Relationship Between Interest Rates and Bond Prices

One of the more common questions I hear from clients is, “Why are my bonds worth less than it was on my previous statement?”

The answer comes down to a basic relationship: when interest rates rise, bond prices generally fall. When interest rates fall, bond prices generally rise. But understanding why this happens and what it means for your investment requires looking beyond the price shown on your statement.

Why Does the Price Change?

Consider a simple example. You own a $1,000 bond paying 4% interest, so you receive $40 per year.

Now imagine that similar bonds are being issued with 5% interest rates. An investor looking at your 4% bond has a choice: buy your bond or buy a new bond offering a higher interest payment.

For someone to be willing to buy your 4% bond, its price would generally need to fall enough to make its overall return competitive with the new 5% bonds. Essentially equalizing the potential return.

The opposite happens when interest rates fall. A bond paying 4% becomes more attractive when newly issued bonds are paying less, so its market value may increase.

Think of the Market as "Mr. Market"

One way I explain this to clients is to think about the market as “Mr. Market.” Every day, Mr. Market gives you a price for your bond. Some days he may be willing to pay $1,050. Other days, he may only offer $950.

That price is important if you need to sell the bond today. But it doesn't change the terms of the bond itself.

If you own a $1,000 bond and hold it to maturity, you generally expect to receive the $1,000 principal at maturity, assuming the issuer meets its obligations. The fact that Mr. Market offered you $950 along the way doesn't change that contractual maturity value.

Mr. Market isn't necessarily wrong when he offers $950. He's reflecting what your bond is worth today compared with other investment opportunities and current market conditions. Mr. Market is giving you a price at which the bond could be sold today.

An Unrealized Loss Still Matters

If your $1,000 bond is currently worth $950, you do have a $50 unrealized loss in market value. It simply doesn't necessarily mean you've suffered a permanent loss of principal.

If you can hold the bond until maturity and the issuer pays as promised, you expect to receive the full $1,000 principal. But if you need to sell before maturity, the $950 market value becomes very real.

A bond that has declined in value can mean something very different to someone who needs the money next month than it does to someone who intends to hold the bond for another eight years.

What About Bond Funds?

Individual bonds and bond funds can both be useful investment tools, but they work differently.

With an individual bond, you generally know the coupon, maturity date, and principal amount you expect to receive at maturity, assuming the issuer meets its obligations.

A bond fund or ETF doesn't have that same single maturity date. The portfolio is continually buying and selling bonds, so its value will continue to respond to changes in interest rates, credit conditions, and other market factors.

That doesn't make one approach inherently better or safer than the other. Credit quality, interest-rate sensitivity, liquidity, time horizon, and the investor's need for cash all matter. The question isn’t whether individual bonds or bond funds are better. It’s which approach makes more sense for the investor’s objectives, time horizon, cash-flow needs and tolerance for price fluctuations. Honestly, this is where meeting and reviewing with your advisor can add value and build trust. The better we understand our client, the better we can build portfolios tailored to their needs/preferences, i.e., a short-term individual bond ladder vs. a long-term bond ladder or intermediate bond fund.

Putting It in Perspective

When you see the value of a bond change in your statement, the price tells you what that investment is worth today or on that particular day. It doesn't necessarily tell you what you will receive at maturity.

Remember; Why has the price changed? What are the terms of the bond? How long until maturity? And do you need to sell it before then?

Understanding the difference between market value and maturity value can help put bond-price fluctuations into perspective. Rather than focusing solely on whether the value went up or down, it's worth considering how the change fits into your overall investment plan.