Corporate Bonds vs Government Bonds

Same basic structure — a loan with fixed interest — but very different risk, and a spread in yield that exists for a reason.

Who's borrowing, and why it matters

Government bonds are issued by a sovereign — in the US, the Treasury — and are backed by that government's ability to tax and, in practice, to print its own currency. That backing makes them the closest thing markets have to a risk-free asset; default is considered extremely unlikely for a government borrowing in its own currency. Corporate bonds are issued by companies to fund operations, expansion, or refinancing, and they carry the actual business risk of that company: if the company's earnings deteriorate enough, it can miss payments or default entirely. That structural difference in who stands behind the debt is the root of every other difference between the two.

The yield and spread difference

Because corporate debt carries default risk that government debt largely doesn't, corporate bonds pay a higher yield to compensate investors for taking on that risk. The extra yield over a comparable-maturity government bond is called the credit spread. A financially strong company with a high credit rating might pay a spread of well under a percentage point over Treasuries; a weaker or lower-rated company can pay several points more. Spreads aren't fixed — they widen when investors grow anxious about defaults broadly, such as heading into an economic slowdown, and narrow when confidence in credit conditions improves.

Credit quality is a spectrum, not a category

Government bonds from stable, large economies are treated as close to uniform in credit quality. Corporate bonds span an enormous range — from AAA-rated blue-chip companies with fortress balance sheets down to junk-rated issuers facing real risk of default. Understanding where a specific corporate bond sits on that spectrum matters as much as, or more than, understanding the general category of 'corporate bond.' See Credit Ratings Explained for how that spectrum is measured and labeled.

What each requires from an investor

Government bonds work well as a portfolio's ballast — the piece that's expected to hold up or even rally when equities and risk assets fall, since investors flee to safety in stress. They also tend to be more liquid, easier to trade quickly at a fair price. Corporate bonds ask more of an investor: judging the issuer's business, its debt load, its industry, and its rating trajectory, since price and default risk are directly tied to company-specific fundamentals rather than macro conditions alone. They can also be less liquid, especially for smaller or lower-rated issuers, meaning spreads can widen sharply and suddenly during periods of market stress even without a change in the company's actual finances.