What is a Bond?

You hand a company or a government some money. They promise to pay you regular interest and return your money on a fixed date. That is what a bond is, in the simplest sentence possible.

The full picture is richer than the sentence suggests. Bonds are the largest financial market in the world, larger than equities. They power your home loan rates, your sip-investors-same-fund-different-returns">options">mutual fund returns, and the salary your government pays. Knowing how they work changes how you see almost every other financial product.

How a bond works in three steps

A bond is a loan, broken into small standardised pieces so many investors can hold a slice each.

• The borrower issues bonds at a face value, often 1,000 rupees or 100 dollars per unit.
• The borrower pays a fixed coupon, usually as a percentage of face value, at regular intervals.
• On the maturity date, the borrower returns the face value to whoever owns the bond at that point.

Suppose a company issues a 5-year bond with a face value of 1,000 rupees and a 7 percent coupon paid annually. You receive 70 rupees every year. At the end of year five, you get the 1,000 back. Your total cash flow is 350 rupees of coupons plus the 1,000 principal, for a total of 1,350.

Who issues bonds and why

Different issuers borrow for different reasons, and that affects risk.

• Governments issue bonds to fund deficits and infrastructure. In India these are called G-Secs, t-bills-one-year-earnings">treasury bills, and state development loans.
• Companies issue bonds, often called debentures or debt/1-lakh-ncd-vs-fd-3-year-return-calculation">non-convertible debentures, to fund growth without diluting equity-as-asset-class">shareholders.
• Banks issue bonds, including subordinated and tier-1 bonds, to meet capital rules.
• Local bodies issue municipal bonds for city projects.

rbi-floating-rate-savings-bond-income">Government bonds are usually the safest. xirr-corporate-bond-portfolio">Corporate bonds carry more risk but pay more. Bank bonds sit in between, depending on the bank and the type.

The three numbers every bond investor watches

Coupon

The fixed interest rate stamped on the bond. It does not change once the bond is issued, so a 7 percent coupon stays 7 percent until maturity.

Yield

The actual return you earn if you buy the bond at today's etfs-and-index-funds/etf-nav-vs-market-price">market price. If a bond with a 7 percent coupon trades at 980 instead of 1,000, your effective yield is higher than 7 percent because you paid less for the same future cash flows.

Duration

A measure of how sensitive the bond's price is to interest rate changes. A long-duration bond gains a lot when rates fall and loses a lot when rates rise. A short-duration bond barely moves either way.

Why bond prices move

This is the part most investors skip, and it is the most useful part to understand.

Bond prices move opposite to interest rates. When market interest rates rise, existing bonds fall in price. When rates fall, existing bonds rise.

Imagine you own a 5-year bond paying a 6 percent coupon. The central bank raises rates, and a new 5-year bond now pays 7 percent. Why would anyone pay full price for your 6 percent bond when they can get 7 percent fresh? They would not, so your bond falls in price until its yield matches 7 percent.

That single relationship explains every dramatic newspaper headline about bond markets. It is also why long-duration bonds are riskier — the same rate move pushes their price further.

How bonds fit in your portfolio

Bonds do three jobs in a portfolio.

1. Stability. They generate predictable income, smoothing equity volatility.
2. Capital preservation. Short-duration high-quality bonds rarely lose much value.
3. Crisis hedge. Government bonds often rise when equities fall, especially during deep recessions.

The exact mix depends on your goal, but the principle holds. As your time horizon shortens, your bond weight should rise.

Different ways to invest in bonds

• Direct G-Secs bought through the RBI Retail Direct platform.
• Corporate bonds bought through bond platforms or nse-and-bse/exchange-membership-aspiring-brokers">stockbrokers.
• Bond mutual funds that hold many bonds at once, removing single-bond risk.
• Bond ETFs that trade like stocks and provide cheap broad exposure.
• investing-in-india/gold-rises-when-stocks-fall-why">Sovereign sgb-maturity-what-happens">Gold Bonds for an inflation-linked sovereign cash flow.

For first-time investors, a high-quality short-duration bond fund is usually the easiest starting point.

Common mistakes new bond investors make

• Chasing the highest coupon without checking credit quality.
• Holding very long-duration bonds when rates are likely to rise.
• Forgetting that bond fund NAVs do move daily.
• Ignoring tax. Most bond returns are taxed at slab rate, which can change the after-tax math.

Frequently asked questions

Q: Are bonds risk-free?
No. Government bonds carry minimal default risk but still face interest-rate and inflation risk. Corporate bonds also carry credit risk.

Q: How often do bonds pay coupons?
Most Indian bonds pay annually or semi-annually. Some pay monthly or quarterly. Always check the offer document.

Q: What is a zero-coupon bond?
A bond that pays no coupon. You buy it at a discount and receive face value at maturity. The whole return comes from the price gap.

Q: Where can I learn more about Indian government bonds?
The Reserve Bank of India publishes auction data, retail platform guides, and yield curves on its website.

Q: Should I prefer individual bonds or bond funds?
Funds give diversification and easier access. Individual bonds give more control over maturity and exact yield. For most sebi/preventing-unfair-ipo-allotments-sebi-role-retail-investor-protection">retail investors, funds are the simpler choice.