What makes a government bond different from every other bond?
Government bonds are the reference point the entire fixed-income world is measured against. Not because they are risk-free — nothing is — but because they are the least uncertain promise available in a given currency, and everything else gets priced as a spread on top of them.
The special feature: sovereign borrowing power
A company repays its bonds out of profits. If profits vanish, so can the repayment. A government repays out of taxes — and, when it borrows in its own currency, it also controls the institution that issues that currency.
That distinction is doing a lot of work. A sovereign borrowing in its own currency essentially cannot be forced into a nominal default; it can always create the currency to pay. What it cannot do is guarantee what that currency will be worth. Nominal default risk is replaced by inflation and currency risk. The promise is kept in letter, possibly not in purchasing power.
Borrowing in someone else's currency removes that escape hatch entirely. A country that has issued dollar-denominated debt must find actual dollars, and history contains many sovereign defaults of exactly this kind. This is why "government bond" is not automatically a synonym for "safe" — the currency of issue matters as much as the issuer.
The maturity ladder
Most large sovereigns issue across a standard set of maturities. Using US terminology, which the market has largely adopted:
- Bills — up to 1 year. Zero-coupon: sold at a discount, repay face value. No interest payments at all.
- Notes — 2 to 10 years. Regular semi-annual coupons.
- Bonds — 20 to 30 years. Regular semi-annual coupons.
Other markets have their own names for the same idea: Gilts (UK), Bunds, Bobls and Schätze (Germany, long/medium/short), OATs (France), JGBs (Japan), BTPs (Italy). Different names, identical machinery.
A worked bill example: a 1-year bill with $1,000 face bought at $9,750 per $10,000, i.e. quoted at 97.50. You pay $975 per $1,000 of face and receive $1,000 in a year. Return = 25 ÷ 975 = 2.56%. There is no coupon anywhere in that calculation — the discount is the interest.
Why they anchor everything
Three properties make government bonds the market's reference:
- Volume. Sovereign debt is issued continuously in enormous size, on a published calendar.
- Liquidity. The most-recently-issued ("on-the-run") government bonds are among the most tradeable instruments on earth — you can move very large amounts without moving the price much.
- Standardisation. One issuer, one currency, dozens of maturities, identical terms. Line them up and you get the yield curve — the closest thing markets have to a public price list for time itself.
Every other bond in that currency is quoted as "government yield + spread." A corporate bond at 5.5% when the matching government bond yields 4.0% is trading at a 150 basis point spread. (One basis point = 0.01%. Bond people count in basis points because 0.01% moves matter on billions.) The next lesson lives entirely inside that spread.
Inflation-linked variants
Most sovereigns also issue inflation-linked bonds — TIPS in the US, index-linked gilts in the UK, OATi in France — where the principal is adjusted by a published price index. The coupon rate stays fixed but is applied to a principal that grows with inflation, so the payments rise too.
These are quoted as real yields: the return above inflation. When a conventional 10-year yields 4.0% and the matching inflation-linked bond yields 1.5% real, the roughly 2.5% gap is the market's implied inflation expectation over that decade — the breakeven inflation rate. It is a market-derived observation about expectations, not a forecast anybody is obliged to be right about.
In the data
The benchmark borrower of the whole market is not rated at the top. The table holds the United States' ratings from the three large agencies, Moody's, S&P and Fitch, and none of the three letters is the highest grade on its scale.
"Risk-free" is a convention the market applies to its benchmark, not a verdict the rating agencies have reached. Most of the world's governments sit a long way below the United States.
Try it now
- Two curves on the same date: the nominal Treasury curve, then the inflation-linked one. Check the dates match, take the 10-year yield from each and subtract the real yield from the nominal one: that gap is breakeven inflation, computed by you in ten seconds. Do it again at five and thirty years.
Go back to the United States' ratings in the section above. For each of the three letters, count how many notches it sits below its own agency's top grade (Aaa for Moody's, AAA for the other two). "Government bond" describes an issuer type, not a quality level.
Say the anchor rule once: "every other bond is priced as the government yield plus a spread." You'll use it for the rest of this domain.