Dr Dhiraj breaks down corporate bond investing for beginners on DifferentTruths.com, simplifying coupons, market prices, and yields.

In the previous column, we began a new journey into the world of corporate bonds. We learnt that a corporate bond is nothing more than a loan that investors give to a company. Instead of borrowing money from a bank, a company borrows directly from investors. It promises to pay them interest at regular intervals before returning the original amount on a fixed date.

The idea itself is fairly simple. The confusion usually begins when someone actually visits a bond investment platform for the first time. Instead of finding a single bond issued by a company, the investor often finds several. One may appear to offer 7 per cent, another 7.80 per cent and yet another more than 8 per cent. Alongside these figures are unfamiliar terms such as coupon, yield, clean price, dirty price and yield to maturity. At first glance, it appears as though understanding bonds requires a degree in finance.

Fortunately, it does not. In fact, once we understand three simple ideas—coupon, price and yield—the rest of the bond market begins to make much more sense.

Let’s Begin with something familiar.

Imagine that you lend ₹1 lakh to a friend for five years. Both of you agree that every year your friend will pay you ₹8,000 as interest and at the end of five years will return your original ₹1 lakh. The arrangement is simple because the amount of interest is fixed from the very beginning. A corporate bond works in almost the same way. Suppose a company issues a bond with a face value of ₹1,000 and promises to pay 8 per cent interest every year. Whoever buys that bond when it is issued will receive ₹80 every year until the bond matures. At maturity, the company returns the original ₹1,000.

This fixed annual interest is called the coupon. Many investors hear the word ‘coupon’ and assume it refers to some discount voucher. In the bond market, however, the word refers to the annual interest promised by the company. It is fixed at the time the bond is issued and normally remains unchanged throughout the life of the bond. So far, everything appears straightforward.

The story becomes interesting only after the bond starts changing hands.

Why Doesn’t Every Bond Continue to Sell at the Same Price?

Think about buying tickets for a cricket World Cup final. Suppose you purchased a ticket for ₹5,000 when bookings opened several months before the match. As the date of the match approaches, demand increases sharply, and someone offers to buy your ticket for ₹8,000. The ticket itself has not changed. The seat remains the same, and the match is still the same – only the market value has changed. The opposite can also happen. If people lose interest in an event or circumstances change, the ticket may sell for less than its original price. Corporate bonds behave in much the same way.

The company continues making the same promise that it made on the day the bond was issued. But the price investors are willing to pay for that promise keeps changing every day. This changing market price is what often surprises first-time investors.

Relationship Between Price and Return

Let us return to our ₹1,000 bond that pays ₹80 every year. Suppose you purchased it when it was first issued. A year later, you need money urgently and decide to sell it. If another investor buys your bond for ₹900, the company continues paying ₹80 every year because the coupon has not changed. But look at the situation from the new buyer’s perspective. Instead of paying ₹1,000 to earn ₹80 every year, the investor has paid only ₹900. Naturally, the return on that investment becomes higher than 8 per cent. Now imagine the opposite situation. Suppose interest rates in the economy have fallen and investors are eager to buy older bonds carrying higher interest rates.

Your bond now sells for ₹1,100. The buyer still receives only ₹80 every year. Since the buyer has invested more money for the same annual income, the actual return becomes lower than 8 per cent. This actual return is known as the yield. The coupon has remained the same. Only the market price has changed. And because the price changed, the yield changed as well. This is perhaps the single most important idea in bond investing.

Why do Bond Prices Rise and Fall?

The next obvious question is why prices keep changing in the first place. The biggest reason is interest rates in the economy. Suppose the Reserve Bank of India reduces policy rates and borrowing becomes cheaper. Companies issuing fresh bonds may now need to offer only around 6.5 per cent interest because money is available at lower cost. Now think about an older bond that continues paying 8 per cent. Naturally, investors begin preferring the older bond because it provides higher income. As more investors compete to buy it, its market price rises. The reverse also happens.

Suppose interest rates increase sharply and new bonds begin offering 9 per cent interest. The older bond paying 8 per cent suddenly appears less attractive. To find buyers, its market price has to fall. This is why bond prices and interest rates usually move in opposite directions. When interest rates fall, bond prices generally rise. When interest rates rise, bond prices generally fall.

Should Ordinary Investors Worry about Daily Price Changes?

Many readers may now wonder whether they need to monitor bond prices every day, just as people track stock market movements. The answer depends entirely on why they bought the bond. Someone actively trading bonds may pay close attention to market prices because buying and selling decisions determine profits and losses. Most individual investors, however, invest in good-quality corporate bonds for a different reason. They want regular income and intend to hold the investment until maturity. For such investors, daily fluctuations in market prices become much less important. As long as the company remains financially sound and honours its commitments, the agreed interest continues to arrive, and the principal is repaid at maturity. That is why experienced bond investors often worry less about daily price movements and much more about the financial strength of the company that has borrowed their money.

Looking Beyond the Highest Interest Rate

One mistake many beginners make is comparing corporate bonds in the same way they compare bank fixed deposits. They look at the highest interest rate and assume that it must automatically be the better investment.

Bond investing is a little different. The coupon tells us what the company promised. The market price tells us how investors currently value that promise. The yield tells us what a new investor may actually earn. Understanding the relationship between these three ideas is far more important than memorising financial terminology. Once this relationship becomes clear, the bond market begins to look much less intimidating and much more logical.

The Final Words…

Every investment has its own language. Mutual funds have concepts such as NAV and expense ratio. Equity investing introduces terms like market capitalisation and price-to-earnings ratio. Similarly, corporate bonds have their own vocabulary. Fortunately, the language of bonds is far simpler than it first appears.

Once we understand that the coupon is the promised interest, the market determines the price, and the yield is the actual return earned by a new investor, we have grasped one of the most important foundations of bond investing.

In the next column, we will move from understanding returns to understanding risk. We will explore what credit ratings such as AAA, AA and A really mean, who assigns these ratings and why a bond offering a higher return may be the market’s way of compensating investors for taking greater risk.

Picture design by Anumita Roy

Dr. Dhiraj Sharma

Dr Dhiraj Sharma, faculty in Management Studies at Punjabi University, Patiala, writes at the intersection of economy, finance, governance, culture, literature, and social change. His interdisciplinary work examines how individuals and institutions adapt to economic and societal shifts. Beyond academia, he pursues creative writing—fiction, non-fiction, poetry—and excels as an avid birder, nature/wildlife photographer, and painter in realistic/semi-impressionist styles. He actively supports government/NGO initiatives for bird watching, butterfly monitoring, and natural habitat conservation. He is our Associate Editor: Economy, Finance and Governance.