The difference between corporate bonds and government bonds comes down to who is borrowing your money. U.S. Treasury securities are backed by the federal government’s power to tax and print currency, which makes them the closest thing to a risk-free investment. Corporate bonds are IOUs from private companies, any of which can run into trouble and stop paying, so they offer higher interest rates to make the risk worth taking. Everything else that separates the two categories, from taxes to how you buy them, flows from that one distinction.
The Core Difference Is Who Owes You
The federal government’s ability to raise revenue through taxation, and its unique power to print the currency its debts are denominated in, makes default on Treasury securities virtually unthinkable. Investors treat Treasuries as the baseline for measuring risk everywhere else.
Corporate bonds are a different story. An issuer’s financial health can deteriorate, and companies do fail to pay. Credit rating agencies like S&P Global, Moody’s, and Fitch assign letter grades that work as shorthand for default probability. Bonds rated BBB- (S&P/Fitch) or Baa3 (Moody’s) and above are “investment grade,” meaning default is viewed as relatively unlikely. Anything below that is “high-yield” or “junk,” signaling substantially higher risk.1S&P Global Ratings. Understanding Credit Ratings
The numbers make the gap concrete. S&P’s 2025 data shows a 0.00% default rate for investment-grade issuers globally, compared to 3.08% for speculative-grade issuers. Within speculative grade, the range is dramatic: BB-rated companies defaulted at just 0.08%, B-rated companies at 1.18%, and CCC/C-rated companies at 25.90%.2S&P Global Ratings. 2025 Annual Global Corporate Default and Rating Transition Study A portfolio of CCC-rated bonds will lose roughly a quarter of its issuers to default in a single year.
Both bond types share one other risk: when prevailing interest rates rise, existing bond prices fall, and longer maturities fall harder. The difference is that a Treasury holder who waits until maturity gets full principal back with certainty. A corporate bondholder waits with the rate risk and the credit risk still hanging over the position.
Yield: What You Get Paid for the Extra Risk
Because corporate bonds carry credit risk that Treasuries do not, they pay higher yields. The gap between a corporate bond’s yield and a Treasury of similar maturity is called the credit spread, and it’s the market’s real-time price tag on default risk.
Spreads widen when investors get nervous about corporate solvency, which usually happens during recessions or financial stress. They narrow when confidence returns. As of late March 2026, the high-yield spread over Treasuries sat around 3.2 percentage points.3Federal Reserve Bank of St. Louis. ICE BofA US High Yield Index Option-Adjusted Spread Investment-grade spreads are typically much tighter, often in the range of 1 to 1.5 percentage points during calm markets.
Corporate prices also react to issuer-specific news on top of broader rate movements. A credit rating downgrade can push a bond’s price down and its yield up overnight, even if the wider economy hasn’t budged. Treasury prices move on macro factors: Federal Reserve policy decisions, inflation expectations, and global demand for safe assets.
One yield feature has no corporate equivalent. Treasury Inflation-Protected Securities (TIPS) adjust their principal up with inflation and down with deflation, based on the Consumer Price Index, and pay interest on the adjusted principal. At maturity, investors receive whichever is greater: the inflation-adjusted principal or the original face value.4TreasuryDirect. Treasury Inflation-Protected Securities (TIPS) Corporate bonds don’t offer that.
How the IRS Treats the Interest
Interest earned on corporate bonds is taxed at every level: federal, state, and local. The IRS treats it as ordinary income, taxed at your marginal rate.5Internal Revenue Service. Topic No. 403, Interest Received
Treasury interest is still subject to federal income tax, but federal law exempts it from state and local taxation.6Office of the Law Revision Counsel. 31 USC 3124 – Exemption From Taxation For someone in a high-tax state like California or New York, that exemption can bring a Treasury’s after-tax yield in line with, or ahead of, a corporate bond paying a higher stated rate. Run the comparison on an after-tax basis before deciding which yield is actually higher.
Selling before maturity works the same way for both. Sell for more than you paid and the profit is a capital gain, long-term if you held over a year (taxed at 0%, 15%, or 20%) and short-term at ordinary rates otherwise. Losses offset gains, with up to $3,000 of net loss usable against ordinary income per year ($1,500 if married filing separately) and the rest carried forward.7Internal Revenue Service. Topic No. 409, Capital Gains and Losses
One boundary worth noting: municipal bonds, issued by state and local governments, are a separate category from either Treasuries or corporates. Their interest is generally exempt from federal tax, and often from state and local tax if you live in the issuing state.8Office of the Law Revision Counsel. 26 USC 103 – Interest on State and Local Bonds If you’re comparing after-tax yields in a high bracket, munis belong in the comparison too.
Predictability of Cash Flow
Many corporate bonds include a call provision that lets the issuer pay off the bond before maturity. Companies use it when rates have dropped and they can refinance cheaper. For the investor, a call means getting principal back early with no way to replace the old coupon at the same rate.
Say you buy a corporate bond yielding 6% and plan on that income for ten years. Rates fall, the company calls the bond after five, and now the best reinvestment options pay 4%. Your income shrank, and you had no vote.
Modern Treasury securities are not callable. The last callable Treasury bonds were issued before 1985. Buy a Treasury note or bond today and the stated rate holds through maturity, which makes cash-flow planning far more predictable.
Getting In: Minimums and How You Actually Buy Them
Treasury securities are among the most accessible investments available. Through TreasuryDirect, the government’s online platform, you can buy bills, notes, bonds, TIPS, and floating rate notes for as little as $100 each, with no commissions.9TreasuryDirect. User Guide Sections 201 Through 210 The purchase goes directly through the Treasury.
Individual corporate bonds are harder to access. Most trade with a face value of $1,000, and a properly diversified portfolio needs at least ten different issuers to blunt the impact of any single default. That pushes a meaningful corporate bond allocation into the tens of thousands of dollars. Retail investors also tend to get worse pricing than institutions buying in bulk.
Bond mutual funds and ETFs solve the access problem. A single fund holds hundreds or thousands of bonds, giving you instant diversification at whatever amount you invest. The tradeoff: bond funds don’t mature. If rates rise and the fund’s holdings lose value, there’s no hold-to-maturity option that guarantees you get your principal back. You sell at whatever the fund’s net asset value is that day.
Liquidity If You Need to Sell Early
The Treasury market is the deepest and most liquid fixed-income market in the world. Prices are transparent, and investors can move large positions without shifting the price much. That liquidity is a big part of why Treasuries function as the global benchmark for safe assets.
Corporate bonds trade over the counter through a network of dealers rather than on a centralized exchange.10Federal Reserve Bank of Philadelphia. How Post-Global Financial Crisis Regulations Impact Dealer Inventories and Liquidity in the OTC Market for U.S. Corporate Bonds That means less price transparency and higher transaction costs, especially for smaller or lower-rated issues. If you need to sell a thinly traded corporate bond quickly, you may have to accept a price well below its theoretical value. Bonds from large, well-known issuers trade more easily, but rarely as smoothly as Treasuries.
Choosing Between Them
The choice usually isn’t all-or-nothing. Treasuries make sense as the anchor of a bond allocation: predictable income, no credit risk, tax-friendly for high-state-tax residents, easy to buy in small amounts. Corporate bonds earn a place when you want more yield and are prepared to accept some default probability and less-friendly tax treatment in exchange. Comparing them honestly means looking at the after-tax yield, not the headline coupon, and factoring in whether the bond is callable and how easily you could sell it if plans change.