What Is a Bond?
How debt instruments work, what issuers promise, and how maturity, coupon, and credit quality affect investors.
A bond is a debt instrument. When you buy a bond, you are lending money to the issuer — a government, a corporation, or a municipality — in exchange for a promise: regular interest payments over a fixed period, and the return of your principal at maturity.
Bonds sit on the opposite end of the risk-return spectrum from stocks in most portfolios. They typically offer lower returns but also more predictable income and a defined repayment schedule. Understanding bonds is essential even for investors who do not hold them directly, because bond markets significantly influence equity markets.
Key Concepts
The coupon is the fixed interest payment a bond issuer makes to bondholders, usually semi-annually or annually. A bond with a face value of ₹1,000 and a 7% coupon pays ₹70 per year. This is the income portion of bond returns.
Maturity is the date on which the issuer repays the principal. A five-year bond issued today will return the face value in five years. Longer maturities typically offer higher yields because investors are tying up capital for longer and accepting more uncertainty over time.
Credit quality is the issuer's ability and willingness to make promised payments. Government bonds (especially sovereign bonds) are considered the safest because governments can raise taxes or print money. Corporate bonds carry more risk — and therefore offer higher yields — because businesses can go bankrupt. Credit rating agencies assess and publish these quality assessments.
The price and yield of a bond move inversely. When interest rates rise, existing bonds paying lower coupons become less attractive, so their market price falls. When rates fall, existing higher-coupon bonds become more valuable. This is called interest rate risk and is the primary reason bond prices fluctuate.
Common Mistakes
Assuming bonds are risk-free is a significant misconception. While government bonds carry very low credit risk, they still carry interest rate risk (price falling when rates rise) and inflation risk (fixed payments losing purchasing power over time).
Buying bonds purely for yield without checking credit quality is dangerous. A 15% yield from an unknown corporate bond could reflect a high probability of default — not an opportunity.
Ignoring the difference between holding a bond to maturity and trading bond funds is also important. If you hold a bond to maturity, you receive the promised payments and principal back (assuming no default). A bond mutual fund has no maturity date — its price fluctuates continuously with market rates.
Key Takeaways
A bond is a loan you make to an issuer in exchange for interest payments and the return of principal at maturity.
Bond prices and interest rates move inversely. Rising rates hurt existing bondholders; falling rates benefit them.
Credit quality determines how safe the promised payments are. Government bonds are safer than corporate bonds, which is why they yield less.
Bonds serve a role in portfolios as diversifiers and income generators — but they carry their own risks that investors should understand.