Why bond prices fall when interest rates rise
The answer
A bond's coupon is fixed for its whole life. When new bonds start paying more, nobody will buy your old lower-paying bond at the old price, so its price falls until the total return it offers matches the new bonds. When new bonds pay less, the same logic runs backwards and your old bond becomes more valuable.
Why this costs you money
An investor moves ₹6 lakh out of shares and into a long-duration debt fund because the market feels expensive and they want somewhere quiet to wait.
Over the next 14 months the central bank raises rates. Nothing in the fund defaults. Every borrower pays every coupon. The fund is down 6%.
They moved money out of a risky asset into a safe one and lost anyway. So they sell the debt fund at the bottom, exactly when its future returns have improved, and conclude that nothing is safe.
Every part of that was predictable and none of it was explained to them. A bond fund that falls when rates rise is not broken. It is doing the only thing it can do. The number that would have told them how far it could fall is on the factsheet, and article 4 is about finding it.
There is a quieter version. Somebody locks into a 10-year deposit at a low rate. Rates rise for 3 years and they earn the old rate while everybody else earns more. They never see a loss on a screen, so they never notice.
How it works
This is the one mechanism in bonds worth being able to explain out loud.
You lend ₹1,000 to the government for 10 years at 6%. Every year you get ₹60. At the end you get ₹1,000 back.
One year later the central bank has raised rates. The government now issues new 10-year bonds paying 8%. A new investor with ₹1,000 can get ₹80 a year.
Now try to sell your bond. Nobody will pay ₹1,000 for a bond paying ₹60 when ₹1,000 buys ₹80 elsewhere. Your bond is not defective. It is worse than what is available, and the market has one way to fix that.
It lowers your price until the buyer's total return matches 8%.
The buyer will pay roughly ₹870. At that price they get ₹60 a year on ₹870, about 6.9%, plus ₹130 of gain when ₹1,000 comes back at maturity. Together, across the remaining years, that is about 8%. The market has repriced your old bond into a new one.
The coupon cannot change, so the price must.
Run it the other way and the result is exactly reversed. If new bonds pay 4%, your bond paying ₹60 is better than anything new, and buyers will pay more than ₹1,000 for it. Falling rates make existing bonds more valuable.
Three consequences follow directly.
1. Bond prices and interest rates always move in opposite directions. Not a tendency. Arithmetic.
2. The longer the bond, the bigger the price move. A bond with 1 year left has 1 mispriced coupon to correct. A bond with 25 years left has 25, plus a face value repayment a long way away. That is article 4.
3. Nothing has to go wrong for this to happen. The borrower is fine and the coupon is paid. The loss is about what else the money could have earned.
One more definition. Yield to maturity is the total annual return you get if you buy at today's price and hold to the end. When people say "rates rose" they mean yields rose. Yields rising and prices falling are the same event described from 2 sides.
What it tells you, and what it does not
A falling bond price tells you the market now expects to be paid more for lending. It does not tell you why, and the why matters. Yields rise for 3 different reasons.
- Expected inflation rose. The money you get back will buy less.
- The policy rate rose, or is expected to. This moves short maturities most.
- The market wants more for lending far into the future. This is the term premium, and it rises when government borrowing is heavy or uncertainty is high.
The first and third can move long-term yields even while the central bank is cutting. This is why "the RBI cut rates, so my gilt fund should go up" is often wrong.
A price fall also tells you nothing about what you finally receive if you hold a single bond to maturity. The face value is a contract. A price fall in between is a change in what somebody else would pay you to leave early. If you do not leave, you never pay it.
That protection does not exist in a bond fund. In a fund, the paper loss becomes your loss on the day you sell.
The decision rule
Match the length of the loan to the date you need the money.
If you need the money on a known date, buy something that returns it on or before that date. A bond maturing then, or a fund whose average maturity is shorter than your horizon.
If your horizon is short and the fund's maturity is long, you are betting on interest rates whether or not you intended to.
Unless you are deliberately taking a view that rates will fall. Then long bonds are the correct instrument, and you should know you are forecasting a central bank.
A second rule. Rising yields are bad for what you own and good for what you buy next. A young saver with 25 years of contributions ahead should want higher yields. The pain is immediate and visible. The benefit is delayed and invisible, which is why almost everybody gets the emotional sign wrong.
Try this now
Three minutes, on your own fund, with no invented numbers.
- Open the monthly factsheet for the debt fund you hold. Search the fund name plus "factsheet".
- Find Yield to Maturity, YTM or Portfolio Yield. This is roughly what the fund earns per year if nothing moves.
- Open the fund page in your app and find the 1-year return.
- Subtract:
1-year return − YTM = the part that came from interest rates moving. - Repeat with the 3-year return if the fund has one.
What you should see. The 2 numbers will not match, and the gap is the whole lesson.
If the 1-year return is below the YTM, yields rose that year. The fund earned its coupons and gave part of them back in price. If it is above the YTM, yields fell and the fund earned its coupons plus a price gain.
For a liquid fund the 2 numbers will be close, often within 0.5%. For a gilt fund or a long duration fund, the gap can be several percentage points either way. That is not a difference in quality. It is a difference in how long the loans are, and it is the entire risk you are carrying.
Three real cases
1. The United States, calendar year 2022 — the worst bond year on record The Federal Reserve raised its policy rate from near zero to over 4% during 2022. The Bloomberg US Aggregate Bond Index, mostly Treasuries and high-grade corporate bonds, fell about 13% — the worst calendar year since the index began in 1976. US 10-year Treasuries fell more than 15%. No issuer in the index missed a payment. Millions of Americans held these bonds as the safe part of their portfolio, and 2022 was also a bad year for shares, so both halves fell together.
2. Austria's 100-year bonds, 2017 and 2020 — the mechanism at its most extreme In September 2017 Austria sold €3.5 billion of bonds maturing in 2117 with a coupon of 2.1%. In June 2020 it sold bonds maturing in 2120 with a coupon of 0.85%, priced to yield 0.88%. As global yields collapsed later in 2020 the 2120 bond rose to around 137, roughly 38% above its issue price. As yields then rose, its price fell to around 30 . Austria's credit was never in question and the coupon was always paid. A change of a little over 2 percentage points in yield removed most of the value, because the money is not due back for a century.
3. India, September 2013 — a central bank defending a currency In mid-2013 the RBI tightened liquidity sharply to defend the rupee, and Indian government bond yields rose hard. The benchmark 10-year yield reached 8.63% on 6 September 2013. After the RBI's 20 September 2013 policy action, which raised the repo rate by 25 basis points to 7.50%, the 10-year yield moved from 8.19% to 8.58% in a single week. That quarter was the worst for Indian bonds since the end of 2009. Gilt fund investors had been told that government bonds carry no credit risk. The statement was true and it was not protection.
The question that resolves it
A bond fund is down 5% and the holder wants to know whether to sell.
A novice asks: is something wrong with the fund?
An expert asks: did yields rise, and is the fund's remaining life shorter or longer than the time I have?
If yields rose and the holder's horizon is longer than the fund's average maturity, then selling converts a paper loss into a real one and forfeits the higher yields that caused it. If they need the money next month, the answer is different. The fall itself does not decide anything. The relationship between 2 lengths of time does.
What would make this wrong
If the relationship were not arithmetic, you would sometimes see bond prices rise when yields rise. For an ordinary fixed-coupon bond you never do.
The honest limits are 4.
Floating rate bonds do not behave this way. Their coupon resets with market rates, so their price barely moves.
Inflation-linked bonds such as US TIPS respond to real yields. When yields rise because inflation expectations rose, TIPS can hold value while ordinary Treasuries fall.
Credit can overwhelm rates. In a crisis, government yields fall while lower-rated corporate yields rise. A corporate bond fund can fall while a gilt fund rises on the same day. Convertible bonds carry an equity option that can do the same. Article 7 covers those.
In India
The RBI's Monetary Policy Committee sets the repo rate, which stood at 5.25% in August 2026. The repo rate anchors the very short end of the curve. It does not set long-term yields.
Long-dated Indian G-Sec yields are driven by 3 things beyond the repo rate: the size of the central and state borrowing programme, inflation expectations, and demand from insurance companies and pension funds, the natural buyers of very long bonds.
The RBI's Financial Stability Report of 31 December 2025 described short yields falling with rate cuts while long yields stayed high, because issuance was heavy and insurers and pension funds had reduced their government bond holdings. Short and long were moving in opposite directions. A repo rate cut is not automatically good news for a long-dated bond fund.
Indian retail exposure runs almost entirely through debt mutual funds. SEBI requires every open-ended debt scheme to publish a Potential Risk Class grid whose interest rate axis runs Class I to Class III. That single number tells you how much of this article applies to you.
In the United States
The Federal Reserve sets the federal funds target range. Beyond the rate itself, 2 tools move US bond prices.
Forward guidance. The Fed publishes each policymaker's forecast for future rates, in a chart known as the dot plot. Long yields move on the forecast, before any rate changes.
Quantitative easing and tightening. The Fed buys or lets mature enormous quantities of Treasuries and mortgage bonds. When the Fed is a buyer, long yields fall. When it stops, they rise, even if the policy rate has not moved.
The American investor has 2 defences an Indian investor mostly does not. Individual Treasuries with a maturity date, bought on TreasuryDirect with a $100 minimum, return face value on a known day. And bond ladders — bonds maturing in each of the next several years — convert interest rate risk into a series of small, staggered decisions.
Where they differ, and what that tells you
The mechanism is identical in both markets. What differs is whether you are allowed to wait.
An American holding a 5-year Treasury and facing a price fall can do nothing. On the maturity date the Treasury pays face value. The paper loss is temporary by contract.
An Indian holding a debt mutual fund has no such date. The fund never repays a principal. The only exit is the market price on the day.
There is one under-used exception. Target maturity funds and ETFs, which have grown quickly in India since about 2021, hold G-Secs, SDLs or top-rated PSU bonds all maturing near a stated date, and then wind up. Hold one to its stated maturity and interest rate movements in between largely cancel out.
What that tells you is a concrete instruction. If you are Indian and you have a known date — a school fee in 2031, a house deposit in 2029 — a target maturity fund ending near that date does something an ordinary debt fund cannot. Almost nobody uses this, because the ordinary debt fund is what gets sold, and the difference is invisible until rates move.
Carry this
- The coupon cannot change, so the price must. Yields up means prices down, always.
- A price fall costs you nothing if you can hold to a maturity date. A fund has no maturity date.
- Rising yields are bad for what you own and good for what you buy next.