What's the real difference between Treasury bonds and corporate bonds? Treasury bonds are issued and backed by the federal government and are generally considered to carry essentially no default risk, while corporate bonds are issued by companies and carry credit risk tied to that specific company's financial health, which is typically compensated with a higher yield than a comparable-maturity Treasury. The gap between the two, often called the credit spread, tends to widen when investors grow more worried about the economy and narrow when confidence improves.

Article Summary

  • Corporate bonds generally pay a higher yield than Treasury bonds of similar maturity specifically because investors demand compensation for taking on credit risk that Treasuries essentially don't carry.
  • Bond credit ratings from agencies like Moody's and S&P split corporate bonds into investment-grade and high-yield (also called "junk") categories, and the yield gap between these categories can widen sharply during economic stress even without an actual default occurring.
  • Treasury bonds carry state and local tax advantages that most corporate bonds don't, since interest from Treasuries is generally exempt from state and local income tax, which can matter more than it first appears in a high-tax state.

"The individual investor should act consistently as an investor and not as a speculator."

Benjamin Graham

Both show up in a portfolio labeled simply as "bonds," and both promise to pay you interest and eventually return your principal, so it's easy to assume they're interchangeable. They aren't. A Treasury bond and a corporate bond are backed by fundamentally different things — one by the taxing and money-issuing power of the federal government, the other by a company's ability to keep generating enough cash flow to pay its debts. That difference shows up in the yield each pays, and understanding why the yields differ is really the whole story of how bond investing works.

What Backs Each Type of Bond

Treasury bonds are debt issued by the federal government, and they're widely treated by the market as close to the safest fixed-income asset available, since the government's ability to tax and, in a pinch, print currency to meet obligations makes default on domestic obligations exceptionally rare among developed sovereign issuers. This near-absence of credit risk is why Treasury yields are often used as the "risk-free rate" baseline that other investments, including corporate bonds, are measured against.

Corporate bonds are issued by individual companies to fund operations, expansion, or refinance existing debt, and the bond's safety depends entirely on that specific company's financial strength. A bond from a large, stable, profitable company is generally considered far safer than a bond from a smaller or heavily indebted one, and this difference is reflected directly in the yield each has to offer to attract buyers — riskier issuers have to pay more to convince investors to lend them money.

Understanding the Credit Spread

The difference between a corporate bond's yield and a Treasury bond of similar maturity is called the credit spread, and it's one of the more useful signals in fixed income markets. A narrow spread suggests investors are relatively confident in corporate borrowers' ability to repay and aren't demanding much extra compensation for the risk; a widening spread suggests growing worry about defaults, even before any company actually misses a payment.

Credit spreads tend to widen noticeably during periods of economic stress, since investors become more risk-averse and demand greater compensation for holding corporate debt, and this widening can cause corporate bond prices to fall even when interest rates broadly haven't moved much. This is why a corporate bond portfolio can underperform Treasuries specifically during downturns, on top of whatever's happening with interest rates generally — it's absorbing credit-risk repricing as well as rate risk.

The Tax Dimension Investors Often Miss

Interest income from Treasury bonds is generally exempt from state and local income taxes, though it remains subject to federal tax. Corporate bond interest, by contrast, is typically fully taxable at both the federal and state level, the same as ordinary interest income from a savings account. For an investor in a high state-tax bracket, this can meaningfully narrow or even eliminate a corporate bond's apparent yield advantage once taxes are actually accounted for.

This is one reason bond location — whether you hold a given bond or bond fund in a taxable brokerage account versus a tax-advantaged retirement account — matters as much as which type of bond you choose. Comparing two bonds purely on their stated yield, without accounting for how each is taxed in your specific account type and tax bracket, can lead to a less favorable choice than it appears on paper.

Deciding How Much of Each to Hold

There's no universal ratio of Treasuries to corporate bonds that fits every investor — it depends on how much you're relying on the bond portion of your portfolio purely for stability versus additional yield, your tax situation, and your overall risk tolerance. Investors who want the bond allocation to function primarily as a shock absorber during stock market downturns often lean more heavily toward Treasuries, since corporate bonds have historically tended to decline in value alongside stocks during the worst downturns, somewhat undercutting the diversification benefit.

Investors more focused on income and willing to accept somewhat more risk for it often include a meaningful allocation to investment-grade corporate bonds, and sometimes a smaller allocation to high-yield bonds, understanding that these behave more like a hybrid between bonds and stocks in how they respond to economic stress. A diversified bond index fund that blends both categories is a reasonable starting point for investors who don't want to actively manage this trade-off themselves.