Yes, bonds can increase in value, and they do so through several different mechanisms depending on what kind of bond you own. A conventional fixed-rate bond rises in price when market interest rates drop below its coupon rate. Inflation-protected Treasuries gain value when their principal is adjusted upward for inflation. Zero-coupon bonds grow steadily as they approach their face value at maturity. Series I savings bonds compound at a rate that combines a fixed component with an inflation component. And any bond can gain value if the issuer’s credit quality improves. Each path to a higher value carries its own tax treatment.
Falling Interest Rates Lift Bond Prices
The most common way a bond gains value is through the inverse relationship between market interest rates and bond prices. When rates fall, older bonds paying higher fixed coupons become more attractive than newly issued bonds paying less. Buyers bid the older bond above its face value, and it trades at a premium. Most corporate bonds are issued with a $1,000 face value, which serves as the baseline for measuring these price changes.1SEC. Investor Bulletin – Corporate Bonds
Say you hold a bond paying 5% annually and new issues are offering 3%. Investors will pay more than $1,000 to lock in your higher income stream. The premium reflects the difference in cash flows over the bond’s remaining life. Traders measure this using yield to maturity, which calculates the total annual return an investor would earn if the bond is held to maturity, accounting for the price paid. As price rises, yield to maturity falls to stay in line with current market rates.1SEC. Investor Bulletin – Corporate Bonds
Rising Rates Push Prices Down
The mechanism works in reverse too, and that matters if you are counting on your bond to gain value. When market rates rise, existing bonds with lower coupons become less attractive and their prices fall. A bond purchased at $1,000 with a 3% coupon could drop to roughly $925 if market rates climb by one percentage point, depending on the remaining maturity.2SEC. Investor Bulletin – Interest Rate Risk This is interest rate risk, and it affects every fixed-rate bond.
Two features determine how much a bond’s price will swing when rates change: maturity length and coupon rate. A bond with a lower coupon generally loses more value when rates rise than a bond with a higher coupon, and a longer-dated bond swings more in either direction than a short-term one.2SEC. Investor Bulletin – Interest Rate Risk Investors use a measurement called duration to estimate this sensitivity. A bond with a duration of seven years would lose roughly 7% of its value if rates rose by one percentage point, and gain about 7% if rates fell by the same amount.
Credit Quality Upgrades
A bond’s market value also rises when the issuer’s financial health improves. Credit rating agencies grade each issuer’s ability to meet its debt obligations. If a company strengthens its balance sheet and earns an upgrade, say from BB to BBB, perceived default risk drops and a wider pool of buyers becomes willing to hold the bond. Demand pushes the price higher.
The jump from below-investment-grade to investment-grade often produces an outsized price move because many pension funds and insurance companies can only hold investment-grade debt. Once a bond crosses that line, a fresh wave of institutional buyers enters the market.
Other issuer-specific factors can also push prices above face value. Municipal bonds often trade at a premium because the interest they pay is excluded from federal income tax, and that tax benefit makes them worth more than a taxable bond offering the same coupon.3Office of the Law Revision Counsel. 26 USC 103 – Interest on State and Local Bonds Liquidity matters as well: bonds that trade frequently are easier to sell without accepting a price cut, which adds to their desirability.
Callable Bonds Have a Price Ceiling
Not every bond can keep rising when rates fall. Callable bonds give the issuer the right to buy back the bond at a set call price before maturity. When rates drop, issuers have a strong incentive to call existing bonds and refinance at the lower rate.4FINRA. Callable Bonds – Be Aware That Your Issuer May Come Calling That creates an effective price ceiling near the call price, because no buyer will pay much more than what the issuer could redeem the bond for.
If you hold a callable bond and rates fall, you face reinvestment risk. The issuer may call the bond, return your principal, and cut off the higher income stream you were counting on. You would then need to reinvest at the new, lower rates. For that reason, investors evaluating callable bonds often look at yield to call, the return assuming redemption at the earliest possible call date, rather than yield to maturity.4FINRA. Callable Bonds – Be Aware That Your Issuer May Come Calling
Zero-Coupon Bonds Grow Through Accretion
Zero-coupon bonds do not pay periodic interest. They are sold at a steep discount to face value and grow toward that face value over time. A zero-coupon bond issued at roughly $675,564 and maturing at $1,000,000 gains value each year through a process called accretion of original issue discount.5eCFR. 26 CFR 1.1272-1 – Current Inclusion of OID in Income
The IRS requires holders to report a portion of that discount as taxable interest income each year, even though no cash arrives until maturity. This is phantom income: you owe tax on money you have not yet collected. The annual amount is calculated using the constant yield method, which spreads the total discount over the bond’s life in progressively larger yearly increments.5eCFR. 26 CFR 1.1272-1 – Current Inclusion of OID in Income Your tax basis rises by the OID you include each year, so the same gain is not taxed again at maturity or sale.
TIPS Gain Value Through Principal Adjustments
Treasury Inflation-Protected Securities increase in value directly, without any market bidding. The Treasury adjusts the face value of each TIPS bond based on changes in the Consumer Price Index for All Urban Consumers. When inflation rises, the principal goes up; when deflation occurs, it goes down. At maturity, you receive either the inflation-adjusted principal or the original face value, whichever is greater.6TreasuryDirect. TIPS – Treasury Inflation-Protected Securities That floor means you cannot get back less than the bond was originally worth.
The Treasury calculates daily index ratios based on the CPI, so the adjusted principal changes continuously.7U.S. Treasury Fiscal Data. TIPS and CPI Data TIPS pay a fixed coupon rate semiannually, but because that rate is applied to the adjusted principal, the dollar amount of each interest payment grows with inflation.6TreasuryDirect. TIPS – Treasury Inflation-Protected Securities If the CPI rises 3%, a $1,000 TIPS bond’s principal increases to $1,030, and interest is calculated on that new figure.
The tax treatment has a wrinkle. Under Treasury regulations, a positive inflation adjustment to principal is classified as original issue discount, taxed as ordinary income in the year the adjustment occurs, even though the investor does not receive the extra principal until the bond matures or is sold.8GovInfo. 26 CFR 1.1275-7 – Inflation-Indexed Debt Instruments That is why many investors hold TIPS inside tax-advantaged retirement accounts.
Series I Savings Bonds
Series I savings bonds are another inflation-linked instrument, and they work quite differently from TIPS. Rather than adjusting principal, I bonds earn a composite rate that combines a fixed rate, set for the life of the bond, with a variable inflation rate that resets every six months. For I bonds issued from November 2025 through April 2026, the composite rate is 4.03%, reflecting a fixed rate of 0.90% and a semiannual inflation rate of 1.56%.9TreasuryDirect. I Bonds Interest Rates
I bonds cannot be traded on the secondary market. You purchase them directly from the Treasury and redeem them at face value plus accumulated interest. Their value grows steadily through compounding rather than through market pricing. The fixed component guarantees a minimum return above inflation for the bond’s full 30-year life, while the inflation component keeps purchasing power intact.
Tax Treatment of Bond Gains
How your bond increases in value determines how the gain is taxed.
Bonds Bought at a Premium
If you buy a taxable bond for more than its face value, you can elect to amortize that premium, gradually deducting a portion each year to offset your interest income.10Office of the Law Revision Counsel. 26 USC 171 – Amortizable Bond Premium Once made, the election applies to all taxable bonds you hold during and after that tax year, and revoking it requires IRS approval.11eCFR. 26 CFR 1.171-4 – Election to Amortize Bond Premium on Taxable Bonds For tax-exempt bonds like municipals, amortization is mandatory: you reduce your basis but cannot take a deduction for the premium.
Bonds Bought at a Discount
Bonds bought below face value work the other way. The price appreciation you realize when the bond matures or is sold may be taxed as ordinary income rather than at the lower capital gains rate, depending on the size of the discount. The IRS uses a de minimis rule to draw the line: small discounts receive capital gains treatment, while larger discounts are taxed as ordinary income. The distinction can significantly affect after-tax return, so it is worth calculating before you buy.
Phantom Income on TIPS and Zero-Coupon Bonds
Both TIPS inflation adjustments and zero-coupon accretion generate taxable income each year even though no cash changes hands. Holding these bonds in a tax-deferred account such as an IRA or 401(k) avoids the annual tax bill and lets the full value compound until withdrawal.