The secondary market for bonds is where previously issued bonds change hands between investors, every business day, long after the original borrower has already collected its money. Trading in this space averages more than $1.7 trillion a day across all U.S. fixed-income segments as of early 2025.1SIFMA. US Fixed Income Securities Statistics The point of the market is simple: bondholders need a way out before maturity, and buyers need a way in after issuance. The issuer receives none of the cash from these trades. Understanding how pricing, spreads, liquidity, and taxes work here is what separates a fair trade from a costly one.
How Bonds Actually Trade
The first sale of a bond is the primary market. Every trade after that is secondary. The issuer’s obligation travels with the bond: if you buy a ten-year corporate bond five years after issuance, the company still owes you the remaining coupons and the face value at maturity, but it sees none of your purchase price.
Most bonds trade over the counter rather than on a centralized exchange. Instead of one order book matching buyers and sellers, a network of dealers negotiates prices directly, mostly through electronic platforms and occasionally by phone. U.S. Treasury securities dominate, averaging around $1.2 trillion in daily volume.2SIFMA. US Treasury Securities Statistics Corporate bonds average roughly $71 billion a day.3SIFMA. US Corporate Bonds Statistics Municipal and mortgage-backed securities fill out the rest.
Electronic platforms have compressed what used to be a phone-based process into seconds, letting institutional buyers request quotes from several dealers at once. Even so, pricing transparency lags what you see in stock markets. Two investors buying the same bond minutes apart can pay slightly different prices depending on the dealer and trade size.
What You Pay Beyond the Quoted Price
When you buy a bond through a dealer acting as principal, there’s no separate commission line. The dealer marks up the price above what it paid (or marks it down when you sell). The bid-ask spread is where most of the cost hides. On a heavily traded Treasury, that spread might be a few cents per $1,000 of face value. On an illiquid high-yield corporate bond, it can be several dollars per $1,000.
FINRA’s markup policy is the main guardrail. It uses 5% as a general benchmark, but that figure is a guide, not a ceiling. A markup of 5% or less can still be found unfair depending on the circumstances, and factors like liquidity, trade size, and the dealer’s own cost all feed into whether a specific markup is reasonable.4FINRA. FINRA Rule 2121 – Fair Prices and Commissions Since 2018, dealers have had to disclose the markup or markdown on retail trade confirmations for corporate and municipal bonds, calculated against the prevailing market price. That disclosure makes it easier to spot an excessive charge after the fact. Checking recent trade prices before you place the order is the better move.
What Drives Bond Prices
Bond prices and interest rates move in opposite directions. If you own a bond paying 4% and new bonds start offering 5%, no one will pay full price for yours. The price falls until the effective yield matches what’s available elsewhere. When rates fall, existing bonds with higher coupons rise above face value.
Duration and Rate Sensitivity
Duration measures how much a bond’s price should move for a one-percentage-point change in rates. A bond with a duration of 7 would be expected to lose about 7% of its value if rates rose by one point, and gain about 7% if rates fell by the same amount. Longer maturities carry higher duration and swing more. A 30-year Treasury can lose a quarter of its market value in a rising-rate environment while a two-year note barely moves.
Call Provisions
Many corporate and municipal bonds are callable, meaning the issuer can repay early after a set date. This caps your upside. If rates drop, a callable bond’s price rarely rises much above face value because investors expect the issuer to redeem it and refinance cheaper. That’s why yield-to-call, which assumes redemption at the earliest call date, is often more useful than yield-to-maturity for callable bonds.
Yield-to-Maturity
Yield-to-maturity is the standard comparison metric. It captures the total return if you hold to maturity, factoring in purchase price, coupons, and the face value received at the end. A bond trading at a discount below $1,000 face will have a YTM higher than its coupon rate; a bond trading at a premium will have a YTM lower than its coupon rate.
Credit Spreads
Price also reflects the market’s view of whether the borrower will actually pay. Rating agencies like Moody’s, S&P, and Fitch assign ratings that serve as shorthand for default risk. A downgrade can trigger forced selling, because many pension funds and insurance companies are barred from holding below-investment-grade paper, and a drop to speculative status can flood the market with sellers.
The credit spread is the extra yield a bond offers over a U.S. Treasury of similar maturity, measured in basis points, where one basis point equals 0.01%.5FINRA. Spread the Word – What You Need to Know About Bond Spreads A corporate bond yielding 2% more than a comparable Treasury has a 200-basis-point spread. Spreads widen during stress and narrow in calmer periods, giving you a better read on sentiment than raw yields alone.
Accrued Interest and What Settlement Looks Like
Bond prices are quoted “clean,” without accrued interest. What you actually pay is the “dirty price,” which includes the interest the seller earned between the last coupon payment and the trade date. Buy a bond halfway through a six-month coupon cycle and you owe the seller about three months of interest on top of the quoted price. You get it back when the next coupon arrives, but your upfront cost is higher than the sticker.
Day-count conventions differ by bond type. Corporate and municipal bonds use a 360-day year; government bonds use 365.6FINRA. Accrued Interest Calculator On a large position the assumption matters. FINRA offers a free accrued interest calculator at that link and it’s worth using before any sizable trade.
On timing, most bond trades now settle on T+1, meaning you must deliver payment or the security by the next business day. This applies to corporate bonds, municipal securities, and most other fixed-income products.7SEC. New T+1 Settlement Cycle – What Investors Need To Know The SEC moved settlement from T+2 to T+1 in May 2024.8SEC. Shortening the Securities Transaction Settlement Cycle
Liquidity and Why It Can Ruin a Trade
Liquidity is the ease of converting a bond to cash without a significant price hit. U.S. Treasuries are the most liquid fixed-income instruments anywhere, with huge daily volume and thin bid-ask spreads. At the other end, a small municipal issue or an obscure high-yield corporate can go days or weeks without a single trade. When you need to sell something no one is actively trading, you’re at whatever price a dealer is willing to offer.
This is where individual investors most often get hurt. The bond may be perfectly creditworthy, but if the market for that specific issue is thin, you pay a wide spread to exit. During stress, liquidity can evaporate even in normally active segments. Dealers pull inventory, spreads blow out, and prices disconnect from fundamental value. Investors often demand a liquidity premium, a slightly higher yield, to compensate for the risk that selling will be hard. That premium stays invisible until you try to sell.
Bond dealers in the OTC market have no legal obligation to provide continuous quotes during volatile periods. Unlike designated market makers on stock exchanges, most bond dealers are voluntary liquidity providers who can stop bidding when risk rises. Bonds that feel easy to trade in calm markets can become nearly impossible to unload in a crisis.
Tax Treatment When You Buy on the Secondary Market
Buying bonds on the secondary market brings tax wrinkles that don’t exist when you buy at original issuance. The IRS treats premium and discount bonds differently, and getting this wrong can mean paying a higher rate than you expected.
Bonds Bought at a Discount
If you buy a bond below face value, the discount may be classified as “market discount.” When you sell or the bond matures, any gain up to the amount of accrued market discount is taxed as ordinary income rather than at capital gains rates.9Office of the Law Revision Counsel. 26 USC 1276 – Disposition Gain Representing Accrued Market Discount Treated as Ordinary Income You might assume that buying at $950 and getting $1,000 back is a $50 capital gain, but the IRS often treats it as ordinary income at your marginal rate.
A de minimis rule provides one exception. If the discount is less than 0.25% of face value multiplied by the number of complete years to maturity, the discount is treated as zero for market discount purposes and any gain is a capital gain instead.10Office of the Law Revision Counsel. 26 USC 1278 – Definitions and Special Rules A bond with 10 years to maturity has a de minimis threshold of $25 (0.25% × $1,000 × 10). Buy it at $980 and the $20 discount falls under the threshold, qualifying for capital gains treatment. Buy it at $970 and the full $30 is market discount taxed as ordinary income.
Bonds Bought at a Premium
Pay more than face and you can elect to amortize the premium over the remaining life of the bond. Amortizing lets you reduce taxable interest income each year by the portion of premium being used up, effectively lowering your annual tax bill on that bond’s coupons. The election applies to all taxable bonds you hold, not just one, and can’t be revoked without IRS approval.11eCFR. 26 CFR 1.171-4 – Election to Amortize Bond Premium on Taxable Bonds Skip the election and you’ll get a capital loss at maturity or sale, but you’ll have paid tax on the full coupon in the meantime.
Municipal Bonds
Interest on municipal bonds generally stays federally tax-exempt whether you bought at issuance or on the secondary market. But if you buy a muni at a discount and it matures at face value, the gain portion can be taxable. States with income taxes often tax interest from out-of-state munis while exempting bonds issued within the state. The tax benefit is real, but “all income is tax-free” oversimplifies it, especially in the secondary market.
How to Check Prices Before You Trade
FINRA reporting rules feed a public database that any investor can search for free. Dealers have to report corporate and agency bond trades to TRACE within 15 minutes of execution. Treasury trades get a 60-minute window.12FINRA. TRACE Reporting Timeframes and Transparency Protocols The data is searchable by CUSIP or ticker and shows recent prices, yields, and trade sizes.13FINRA. Fixed Income Data
Before you place an order, pull the TRACE history for the bond. Compare recent trades to what your broker is quoting. If the last five trades printed at $101.50 and your broker offers you $103, that’s a steep markup. For thinly traded bonds, the most recent print might be days or weeks old, which itself tells you something important about how hard the bond will be to sell later.
One boundary worth naming: individual bonds usually require a minimum trade size of two to ten bonds, so the smallest position may run $2,000 to $10,000 in face value. Investors who can’t or don’t want to buy at that size typically use bond mutual funds or ETFs, which handle accrued interest, settlement, and reinvestment for you in exchange for a management fee and less control over which specific bonds you own.