When interest rates rise, the prices of existing bonds fall. When rates fall, bond prices rise. This see-saw is one of the most important ideas in finance, and it also helps explain why some shares behave like bonds. This article explains what a bond is, why its price moves opposite to interest rates, which bonds move most, and how this links to the stock market.
A quick reminder: what a bond is
A bond is a loan you give to a government or a company. In return, the borrower pays you a fixed interest payment, called the coupon, at regular intervals, and returns the original amount, the face value, on the maturity date. Bonds can be bought and sold before maturity, so they have a market price that changes every day.
The yield is the return a buyer earns if they buy the bond at today's price and hold it to maturity. Price and yield always move in opposite directions: a lower price means a higher yield, and a higher price means a lower yield.
Why prices move opposite to interest rates
Imagine you hold a bond with a face value of ₹1,000 that pays a coupon of 7% (₹70 a year). Then interest rates in the economy rise, and new bonds of the same kind now pay 8% (₹80 a year).
Nobody will pay ₹1,000 for your bond paying ₹70 when they can buy a new one paying ₹80. To sell it, you must accept a lower price, low enough that the buyer's overall return matches about 8%. So your bond's price falls.
The reverse happens when rates fall. If new bonds pay only 6% (₹60), your bond paying ₹70 becomes more attractive, and buyers will pay more than ₹1,000 for it. Its price rises.
The coupon never changes; what changes is the price people will pay for that fixed stream of payments.
Which bonds move most
Longer bonds move more. A bond maturing in 30 years locks in its coupon for much longer than one maturing in 1 year, so a change in rates matters far more to its value. Investors measure this sensitivity with a figure called duration: the higher the duration, the bigger the price change for each change in rates.
Lower-coupon bonds move more than high-coupon bonds of the same maturity, because more of their value comes from the final repayment, far in the future.
Bonds held to maturity still pay back their face value at the end (if the borrower does not default), so price swings in between matter mainly to those who sell early or value their holdings at market prices.
Central bank rates and bond yields
Central banks such as the RBI and the Fed set short-term rates. Short-term bond yields usually follow these closely. Long-term yields depend more on what investors expect for inflation, growth and government borrowing over many years. That is why long-term yields can sometimes stay high, or even rise, while a central bank is cutting short-term rates.
Example on PositoAI: short-term rates vs a long-term yield
On PositoAI's central bank pages, the US Fed target range was 3.75–4.00% on 19 Oct 2026, while the 10-year US Treasury yield was 5.09% on 16 Oct 2026, more than a full percentage point higher. In India, the RBI page shows a repo rate of 5.50%, after a 0.25 percentage point increase on 7 Oct 2026. The gap between short and long rates reflects what investors expect over the years ahead, not only today's policy rate.
The link to shares
Bonds and shares compete for the same savings. When bond yields rise, bonds offer a better return for less risk, so investors may demand more from shares before buying them, which can weigh on share prices. When yields fall, shares can look more attractive by comparison.
Some shares behave a little like bonds. Companies with steady, predictable income, such as power utilities and property companies that rent out buildings, are often valued partly for their regular dividends. When bond yields rise, their dividends look less attractive next to bonds; and because these companies often borrow heavily, higher rates also raise their interest costs. Both effects can make them sensitive to interest rates.
Example on PositoAI: "bond-like" companies carry heavy debt
On their PosiFunda pages, US property company Realty Income paid about $19.2 in interest per $100 of sales, with net debt equal to about 55% of its market value; NextEra Energy paid about $16.7, with net debt about 57% of market value. In India, Tata Power paid about ₹8.1 per ₹100 of sales, with net debt about 66% of its market value. (Latest yearly results, as on 20 Oct 2026.)
Bonds and debt funds in India
Most Indian savers reach bonds through debt mutual funds, which hold government and company bonds. The same see-saw applies: when interest rates fall, the bonds inside these funds rise in price and fund values tend to go up; when rates rise, fund values can dip. Funds holding longer bonds (such as gilt or long-duration funds) swing more than funds holding very short bonds (such as liquid or overnight funds). This is why the same RBI decision can affect different debt funds very differently.
Common misconceptions
"Bonds are completely safe." Their prices can fall when rates rise, and borrowers can default. Government bonds carry less default risk than company bonds, but their prices still move.
"A higher yield is always better." A very high yield can signal that investors see more risk of default.
"When the central bank cuts, all yields fall." Short-term yields usually follow; long-term yields may not.
Frequently asked questions
What is a bond yield?
The return earned by buying a bond at today's price and holding it to maturity.
Why do bond prices fall when rates rise?
Because new bonds pay more, so existing bonds with lower fixed coupons must become cheaper to attract buyers.
What is duration?
A measure of how much a bond's price changes when interest rates change; longer bonds usually have higher duration.
How can Indians invest in bonds?
Through debt mutual funds, government bond schemes and, increasingly, directly through online platforms for government securities.
How to use this on PositoAI
See current policy rates on the RBI page and the US Fed page, including the 10-year US Treasury yield. On any company's PosiFunda page, the interest cost per 100 of sales and the Cash Cushion Ratio show how much debt it carries. PosiStep 8 of PosiCourse, PositoAI's free stock market course, explains different kinds of stocks.
Suggested reading
What is a Bond? · How RBI Interest Rate Decisions Affect the Stock Market · What Happens to Stocks When the US Fed Cuts Rates · What is a Mutual Fund? · What is Inflation?
Summary
A bond pays a fixed coupon, so when interest rates rise, its price must fall to give new buyers a return in line with the market, and when rates fall, its price rises. Longer and lower-coupon bonds move most. Central banks set short-term rates, while long-term yields reflect expectations for inflation and growth. Bonds compete with shares for savings, and companies with steady income and heavy borrowing, such as utilities and property owners, often react to interest rates like bonds do.