The Core Distinction Is Credit Risk
Corporate bonds are issued by private companies. Government bonds are issued by national Treasuries. The gap between them is not about who needs money more but about who is more likely to pay you back. The US government has never defaulted on its nominal debt. Companies do. That is the hard edge of the difference.
Credit rating agencies assign scores to both. US Treasuries get the highest possible rating, AAA. Corporate bonds range from AAA down to D for default. The difference in credit quality directly determines the interest rate you receive. The riskier the issuer, the higher the yield you demand. That extra yield is the credit spread.
Yield Spreads in Hard Numbers
The Bloomberg US Corporate Bond Index yields roughly 1.0% to 1.5% more than the equivalent Treasury at the same maturity during normal markets. In stressed markets that spread can blow out to 3% or 4% or more. In 2020, during the COVID crash, investment grade corporate spreads hit 4.5%. High yield corporates, those rated below investment grade, have historically yielded 3% to 6% more than Treasuries on average and much wider during recessions.
If you buy a 10 year Treasury yielding 4.5% and a 10 year investment grade corporate bond yielding 5.5%, the extra 100 basis points is your compensation for taking company specific risk. But that 100 basis points is not free money. It comes with downside.
Default rates matter. According to Moody’s data from 1920 to 2023, the average cumulative default rate for investment grade corporate bonds over a 10 year horizon is around 1.5%. For high yield bonds, it is roughly 20%. If a bond defaults, you lose principal and accrued interest, minus recovery. Recovery rates for senior unsecured bonds average 40% to 60% of face value in default.
So the extra yield on investment grade corporates has historically more than compensated for the default risk. But the extra yield on high yield is eaten up significantly by defaults. You need to pick your tier.
Tax Treatment Changes the Real Return
US Treasuries are exempt from state and local income taxes. Corporate bonds are fully taxable at every level. This is a big deal if you live in a high tax state like California or New York. A Treasury yielding 4.5% that is state tax free gives you the same after tax income as a corporate bond yielding roughly 4.85% in a 7% state tax bracket. The difference grows as your state rate increases.
Municipal bonds are a third category, but this article focuses on the two main types. When comparing yields, always convert to after tax yield using your marginal federal, state, and local rates. The state exemption for Treasuries can flip the comparison in favor of government debt even when corporates show a higher coupon.
Liquidity and Trading Costs
US Treasuries are the most liquid securities on the planet. The bid ask spread on a recently issued 10 year Treasury is typically one basis point. Investment grade corporate bonds have spreads ranging from 5 to 20 basis points for large, frequent issuers and much wider for smaller issues. High yield corporate bonds are the thinnest. In stressed markets, corporate bond liquidity can vanish. During the 2008 crisis, many corporate bonds traded at 50 basis point spreads or more, and some could not be sold at any reasonable price.
If you need to sell before maturity, Treasuries give you a clean exit. Corporates cost you in spread, potentially eroding your return. This is especially dangerous for individual investors who hold bonds directly rather than via funds.
Maturity Structures and Call Features
Government bonds are typically bullet maturity, meaning the principal is repaid in full at the end of the term. Corporate bonds often include call provisions that allow the issuer to repay the bond early, usually after a few years. When interest rates fall, companies call their old bonds and issue new ones at lower rates. As a bondholder, you get your principal back early and are forced to reinvest at lower yields. That is call risk.
Callable corporate bonds usually offer a higher yield than noncallable ones to compensate for that risk. But if rates stay flat or rise, the call is unlikely to be exercised and you collect the high yield. If rates drop, you lose the upside. Treasuries do not have call risk unless you are buying a specific callable Treasury, which is rare. For typical investors, Treasuries are a pure bet on interest rates with no optionality.
Duration and Interest Rate Sensitivity
Both corporate and government bonds move with interest rates. A 10 year bond, regardless of issuer, will lose roughly 8% of its price if rates rise 1%. But corporate bonds have an additional spread duration factor. If credit spreads widen because the economy weakens, corporate bond prices fall beyond the rate move. Treasuries do not have spread risk. They only reflect changes in the risk free rate.
During a recession, the Fed typically cuts rates, which lifts bond prices for Treasuries. But corporate bonds get hit by spread widening at the same time. The net effect can be zero or negative for corporates, even as Treasuries rally. You need to understand that correlation pattern when building a diversified bond allocation.
Which One Belongs in Your Portfolio?
Start with your risk tolerance and time horizon. If you need capital preservation above all else, US Treasuries are the safest option. If you need income and can tolerate moderate price volatility, investment grade corporate bonds offer a clear yield advantage with historically low default risk. If you are reaching for yield beyond that, high yield corporate bonds become a distinct asset class with equity like risk.
Your tax bracket also matters. High earners in high tax states should favor Treasuries and municipals over corporates, even if the pretax yield on corporates looks higher. Do the after tax math with your numbers. The rule of thumb is compare the taxable equivalent yield of a Treasury by dividing its yield by (1 minus your marginal state tax rate). If the corporate yield is higher than that, the corporate wins net of state taxes. If not, the Treasury is the better deal.
Liquidity needs push the same direction. If you might need to sell before maturity, Treasuries give you a cleaner trade. Corporates create friction, especially in volatile markets. If you hold to maturity, liquidity is irrelevant. But most investors do not hold to maturity in practice.
Call risk is a hidden cost. If you buy a corporate bond at a premium and it gets called, you lose that premium. Stick to noncallable bonds or funds that manage call risk explicitly.
The Takeaway
Corporate bonds offer higher yields than government bonds, but the extra return comes with trade-offs: credit risk, lower liquidity, tax disadvantages, and call risk. The numbers show that investment grade corporates have historically compensated for defaults, while high yield corporates require careful selection and tolerance for volatility. Match your bond choice to your tax situation, liquidity needs, and ability to hold through spread widening. If you cannot explain the spread, stick with Treasuries.
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