Bond market value is the price a bond trades for on the secondary market, and that price sits above or below par whenever conditions have shifted since the bond was issued. Par value is the face amount the issuer promises to repay at maturity, typically $1,000 for corporate bonds and $5,000 for most municipal bonds.1Municipal Securities Rulemaking Board. How Are Municipal Bonds Quoted and Priced Three forces do most of the work in pushing prices up or down: prevailing interest rates, the issuer’s creditworthiness, and the time left until maturity.
Why Interest Rates Move Prices Up and Down
Interest rates and bond prices move in opposite directions. When rates rise, existing bonds paying lower fixed coupons become less attractive, and their market price drops until the yield a new buyer earns matches what a freshly issued bond offers. When rates fall, the older bond’s relatively generous coupon becomes more valuable, and buyers bid the price above par to capture it.
Say you hold a bond paying a 5% coupon and new bonds start offering 6%. Nobody will pay full face value for yours when they can buy a new one with a better payout. The price falls until the effective yield climbs to roughly 6%. The reverse works the same way: if new bonds drop to 4%, your 5% coupon looks attractive, and the price gets bid above par.
Yield to maturity is the number that captures this. It is the total annualized return an investor expects if they buy the bond at the current price and hold it until the issuer repays the principal, accounting for every remaining coupon, the purchase price, and the face value received at the end. When price drops, yield to maturity rises; when price climbs, yield to maturity falls. That is the mechanism keeping every bond on the secondary market priced in line with current conditions.
Trading Above Par: Premium Bonds
A bond trading above face value is a premium bond. This happens when the coupon rate beats what the market currently offers. A bond paying 7% while new issues come out at 4% generates far more annual income, and buyers will pay more than face value to get those cash flows.
The premium is not a loss built into the purchase. It is the mathematically fair price that aligns the bond’s yield to maturity with prevailing rates. A buyer paying $1,080 for a $1,000 bond with a 7% coupon and ten years left is locking in income that exceeds what is available elsewhere, offset by the fact that the issuer only repays $1,000 at maturity. The $80 premium gradually erodes over the bond’s life as the price converges back toward par.
One wrinkle catches premium buyers off guard: call risk. Many corporate and municipal bonds give the issuer the right to redeem the bond early, usually at par. If you paid $1,080 and the issuer calls the bond at $1,000 two years later, you lose the premium and all the future coupon payments you were counting on.2Investor.gov. Callable or Redeemable Bonds Issuers call bonds when rates have fallen, because they can refinance at a lower cost. That is exactly when you face reinvestment risk, getting your money back at the worst time to redeploy it.
Call Protection and Yield to Call
Not all callable bonds carry equal risk. Some include a call protection period during which the issuer cannot redeem. A ten-year bond with nine years of call protection behaves almost like a non-callable bond for most of its life. Bonds with short call protection or none at all rarely trade much above par, because the market knows the issuer could wipe out the premium at any time.
For a premium callable bond, yield to maturity can paint a misleadingly rosy picture. Yield to call calculates your annualized return assuming the bond is redeemed at the first available call date. Whenever yield to call sits below yield to maturity on a premium bond, the market is telling you an early call is a real possibility, and the lower number is the one to plan around.
Trading Below Par: Discount Bonds
A discount bond trades below face value because its coupon is no longer competitive. If new issues offer 6%, a bond paying 4% needs a price cut to attract buyers. A bond originally issued at par might trade at $920, and the gap between $920 and the $1,000 paid at maturity effectively supplements the thin coupon, bringing total return up to market level.
Rising inflation is a common trigger for discount pricing. Fixed coupon payments lose purchasing power when prices climb, so investors sell fixed-rate bonds in favor of assets with better inflation protection. The selling pressure pushes prices down until yields rise enough to compensate. Credit downgrades can push bonds into discount territory for a different reason, covered next.
How Credit Quality Shifts Prices
Interest rates are not the only force moving bond prices. The issuer’s financial health matters on its own. Rating agencies evaluate how likely a borrower is to make its payments on time, and upgrades or downgrades ripple through the secondary market immediately.
When an agency upgrades a company from a speculative rating like BB to an investment-grade rating like BBB, perceived risk drops, more institutional investors become eligible to buy, and the price rises. A downgrade works in reverse and tends to be more dramatic: investors demand a higher yield to compensate for the added uncertainty, and that higher required yield translates directly into a lower market price.
Analysts track this through the credit spread, the gap between a corporate bond’s yield and the yield on a comparable U.S. Treasury.3Federal Reserve Bank of St. Louis. ICE BofA US High Yield Index Option-Adjusted Spread Wider spreads mean more perceived risk and lower bond prices; narrower spreads mean growing confidence and higher prices. Credit-driven price moves happen independently of interest rate trends, which is why diversifying across issuers matters at least as much as managing rate exposure.
Time to Maturity, Duration, and Pull to Par
A bond with 25 years left will swing far more in price for the same rate change than one maturing in two years. A long-term bond locks in a fixed return for decades, so any shift in rates opens a bigger gap between what you are earning and what the market now offers. A short-term bond returns principal soon, so even an unfavorable move only lasts briefly.
Duration puts a number on this sensitivity. It estimates how much a bond’s price will change for every one-percentage-point move in rates. A bond with a duration of eight years will drop roughly 8% if rates rise by a point, and gain roughly 8% if rates fall by a point. Longer maturities, lower coupons, and lower yields all increase duration. Shorter-duration bonds offer more price stability at the cost of lower income.
Whether a bond trades at a premium or a discount, its price gravitates toward face value as maturity approaches. A premium drifts down toward par; a discount drifts up. The convergence accelerates in the final years, because with little time left there is less room for conditions to change, and the bond increasingly resembles a simple agreement to pay a known amount on a known date. Hold to maturity and you receive par regardless of what you paid.
Tax Treatment of Premiums and Discounts
The IRS treats premiums and discounts very differently, and the rules shape your after-tax return more than many investors expect.
Buying Below Par
When you buy a bond below par and hold it to maturity, the gain from purchase price to face value is generally taxed as ordinary income rather than at the lower capital gains rate.4Office of the Law Revision Counsel. 26 USC 1276 – Disposition Gain Representing Accrued Market Discount Treated as Ordinary Income For most taxpayers, that is a meaningful difference.
There is an exception for small discounts. The de minimis rule sets a threshold of 0.25% of face value for each full year remaining to maturity. If the discount falls below that threshold, the gain is taxed at the capital gains rate instead.5Municipal Securities Rulemaking Board. Tax and Liquidity Considerations for Buying Discount Bonds For a bond with ten years left, the threshold is 2.5% of par, or $25 on a $1,000 bond. Buy it at $976 and the $24 gain qualifies for capital gains treatment. Buy it at $970 and the full $30 gain is ordinary income.
Original issue discount, where the issuer sold the bond below par at issuance, follows its own rules. The IRS treats OID as a form of interest that accrues annually, so you report a portion of the discount as taxable income each year you hold the bond, even though you do not receive the cash until maturity.6Internal Revenue Service. Publication 1212 – Guide to Original Issue Discount (OID) Instruments
Buying Above Par
If you buy a taxable bond above par, you can elect to amortize the premium over the bond’s remaining life.7Office of the Law Revision Counsel. 26 USC 171 – Amortizable Bond Premium Amortization reduces the taxable interest you report each year by the share of the premium allocated to that period. If you paid $1,080 for a bond with a $70 annual coupon, you would not report the full $70 as interest income; the amortized premium offsets part of it.
The election is not automatic. You make it on your return for the first year you want it to apply, and once elected, it covers every taxable bond you own going forward. Revoking it requires IRS approval.8eCFR. 26 CFR 1.171-4 – Election to Amortize Bond Premium on Taxable Bonds The commitment is worth making in most cases, but the all-or-nothing scope is worth understanding before you file.
Municipal Bonds
Interest on municipal bonds is generally exempt from federal income tax.9Internal Revenue Service. Tax-Exempt Interest Capital gains from selling a municipal bond above your purchase price are still taxable, however, and if you buy a municipal bond at a market discount, the ordinary income rules described above still apply to the discount portion. The federal exemption covers the coupon, not every dollar you earn from owning the bond.
What You Actually Pay for a Bond
The quoted price is not necessarily what leaves your account. Two factors sit between the number you see and the number you pay.
Accrued Interest
Bonds typically pay interest every six months. If you buy between coupon dates, the seller has earned a share of the next coupon for the time they held the bond since the last payment. You reimburse them for that accrued interest at settlement, and when the next full coupon arrives, you receive the entire amount, effectively getting back what you fronted. The quoted price, called the clean price, excludes accrued interest. The amount you actually pay, the dirty price, includes it. New bond buyers often get tripped up comparing the two.
Markups and Markdowns
Unlike stocks, most bonds trade through dealers rather than on a centralized exchange. When a dealer sells you a bond from inventory, they typically charge a markup over the price they paid. When you sell, they buy at a markdown below what they expect to resell it for. MSRB Rule G-30 requires markups and markdowns on municipal securities to be fair and reasonable.10Municipal Securities Rulemaking Board. MSRB Rule G-30 Prices and Commissions For corporate bonds, FINRA Rule 2232 requires dealers to disclose the dollar amount and percentage of the markup on retail transactions when they bought and sold the same bond that day.11FINRA. FINRA Rule 2232 Customer Confirmations
Transaction costs run higher on smaller trades. In the municipal bond market, retail-sized trades have historically carried wider effective spreads than institutional-sized trades, and smaller investors have had less pricing information to negotiate from.12Municipal Securities Rulemaking Board. Transaction Costs for Customer Trades in the Municipal Bond Market Comparing bonds on yield to maturity alone can mislead if you are not also factoring in the spread you will pay to get in and out of the position.