What Government Bonds Are
What Government Bonds Are
Governments borrow money the same way individuals and corporations do—by issuing debt. A government bond is that debt: a legal promise to pay back borrowed money plus interest over a set period. The borrower is a nation's treasury or central authority; the lender is you, me, or an institution.
Key takeaways
- Government bonds are IOUs issued by sovereigns to finance spending, refinance maturing debt, or manage interest rates
- They are backed by a government's taxing power and its ability (or willingness) to print currency
- Interest risk, inflation risk, and credit risk are the three main drivers of bond price changes
- Developed-market government bonds (US Treasuries, UK gilts, German bunds) are treated as the safest assets in most portfolios
- Real yields on government bonds can turn negative when inflation exceeds coupon rates
The backbone of fixed income
Government bonds are the backbone of the global fixed-income market. In the United States alone, the Treasury issued over $8 trillion in outstanding debt as of 2024. The UK has £1.5 trillion in gilt-edged stock. Germany issues bunds worth hundreds of billions across all maturities. These securities define the yield curve—the set of interest rates that prices every other bond and loan in the economy.
Why do investors hold government bonds despite their historically modest returns? Two reasons: safety and benchmark. Developed-market sovereigns have never defaulted on domestic-currency debt (the US, UK, Germany, Canada, Japan, and Australia have all proven this across centuries of finance). Because default risk is negligible, government bond yields set the floor for all other borrowing costs. A corporation cannot borrow cheaper than the government can; a household mortgage rate cannot undercut the 10-year Treasury yield by much. Government bonds are the reference point.
The three sources of bond risk
Contrary to popular belief, government bonds are not risk-free. They carry three distinct types of risk.
Interest-rate risk is the most obvious. When you hold a bond paying 3% and interest rates rise to 4%, your bond becomes less attractive. Its price falls so that its yield matches the new market rate. If you sell before maturity, you realize a loss. If you hold to maturity, you get your full principal back, but you've foregone the opportunity to earn 4%. Long bonds (20-year, 30-year) are far more sensitive to rate changes than short bonds (1-year, 2-year). A 1% rise in rates might drop a 2-year note by 2%, but drop a 30-year bond by 20% or more.
Inflation risk is subtler. Imagine you buy a 10-year Treasury yielding 2.5% per year. If inflation averages 3% over those 10 years, your real return is negative: you earn 2.5% in money terms but lose 3% in purchasing power each year, leaving you with a loss of approximately 0.5% in real terms. This was the plight of long-bond holders in the 2010s, when yields fell but inflation remained elevated, eroding real returns. TIPS (Treasury Inflation-Protected Securities) exist precisely to hedge this risk by adjusting principal with the consumer price index.
Credit risk, the third form, is the risk that the issuer fails to pay. For US Treasuries, the UK gilts, German bunds, and Japanese Government Bonds (JGBs), this risk is so low that most investors rate it as negligible. These sovereigns have strong tax bases, large GDPs, and—in most cases—currencies they control. A developed-market sovereign can always pay debts denominated in its own currency by printing money, though doing so may cause inflation. Emerging-market bonds carry far more credit risk: a country with a weaker economy, higher debt, or lower-quality institutions may struggle to service its debts.
The government bond yield curve
The government bond yield curve is a plot of yield (y-axis) against maturity (x-axis). A typical curve slopes upward: 2-year bonds yield less than 10-year bonds, which yield less than 30-year bonds. This reflects the fact that longer-term lenders demand higher compensation for tying up capital and bearing more interest-rate and inflation risk over decades.
But the curve is not always upward-sloping. During late 2022 and early 2023, the US Treasury yield curve inverted: short-term rates exceeded long-term rates. This inversion has historically preceded recessions and is watched closely by economists and investors alike. An inverted curve signals that markets expect economic slowdown, lower future short-term rates, and potentially lower inflation or deflation—all of which would push down future growth expectations.
The shape of the government bond yield curve changes daily as investors buy and sell bonds. Central banks also influence it through policy. When the Federal Reserve sets its target for short-term rates (the federal funds rate), it anchors the short end of the Treasury curve. When the Fed holds long-term bonds in its portfolio—as it did during the 2008 financial crisis and 2020 pandemic—it can influence long-term yields through demand. These actions matter because the Treasury curve feeds into mortgage rates, corporate borrowing costs, and ultimately the entire economy.
How bonds fit into investment portfolios
Most investors hold government bonds for stability and income. In a 60-40 portfolio (60% stocks, 40% bonds), the bond allocation is typically split between government bonds (perhaps 40–50% of the bond bucket) and corporate or international bonds (the rest). Government bonds move differently than stocks: when stocks crash, investors rush into government bonds, driving prices up and yields down. This negative correlation with stocks makes bonds valuable as a portfolio anchor.
The percentage of government bonds versus corporate or international bonds depends on your risk tolerance and return needs. A conservative investor near or in retirement might hold 30% bonds, of which 70% are government bonds and 30% are corporate. An aggressive young investor might hold 20% bonds, of which 50% are government bonds and 50% are higher-yielding corporate or emerging-market bonds. There is no single correct allocation—it depends on your time horizon, volatility tolerance, and income needs.
The mechanics of buying government bonds
You can buy government bonds in several ways. The most direct is through an auction. In the US, the Treasury Department holds auctions every week for T-bills (short-term), Treasury notes (medium-term), and Treasury bonds (long-term). You can bid directly at TreasuryDirect.gov, setting up an account and buying securities with no intermediary fees. The minimum investment is $100, and you can hold bonds until maturity, at which point the Treasury pays you back the principal and final coupon payment.
Alternatively, you can buy government bond ETFs or mutual funds. A fund like BND (Vanguard Total Bond Market ETF) holds thousands of US Treasuries, agency bonds, and investment-grade corporate bonds, offering diversification and daily liquidity. Or you can buy individual bonds through a brokerage (Vanguard, Fidelity, Schwab, Interactive Brokers), though you'll pay a bid-ask spread and may face higher minimums. The trade-off: individual bonds are simpler (no ongoing management, just hold to maturity), but funds offer liquidity and diversification if you want to exit early.
Duration and convexity—the math behind price changes
Bond professionals measure price sensitivity to interest rates using a metric called duration. A bond with a 5-year duration falls roughly 5% in price for every 1% rise in yields. A 10-year bond with a 7-year duration falls 7%. Duration is a weighted average of the time you wait to receive each cash flow (coupon and principal). Longer bonds and bonds with lower coupons have longer durations and thus more interest-rate risk.
Convexity is a second-order adjustment: as yields change dramatically, the relationship between yield and price becomes curved rather than linear. Long bonds with high convexity tend to outperform in sharp rallies and underperform in sharp sell-offs. In practice, most retail investors need not calculate these metrics themselves—bond funds and brokerages report duration and convexity for any security.
Why central banks care about government bonds
Central banks hold massive quantities of government bonds for one simple reason: controlling money supply and interest rates. When the Federal Reserve wants to lower rates, it buys long-term Treasuries, which pushes their prices up and yields down. When it wants to tighten, it sells or lets its holdings mature without replacing them, reducing demand and pushing yields up. This is no minor operation: the Fed's balance sheet reached $9 trillion in 2022 and held over $5 trillion in Treasuries and mortgage-backed securities at its peak.
This dynamic creates a feedback loop. When central banks hold yields low and stable, governments can refinance debt cheaply. When they remove support—as the Fed did in 2022 after years of near-zero rates—government bond yields spike and borrowing costs rise. Countries with high debt loads become vulnerable. Understanding this interplay is essential to understanding why government bond yields move the way they do.
Taxing considerations
In most countries, government bond interest income is taxable as ordinary income at your marginal tax rate. In the US, federal income tax applies, and in many states, local income tax applies too. However, Treasury securities are exempt from state and local taxes, making them slightly more attractive than corporate bonds if you live in a high-tax state like California or New York. I Bonds (inflation-linked savings bonds) and Series EE bonds receive even more favorable tax treatment: interest is deferred until redemption, and if used for qualified education expenses, it may be tax-free.
For tax-deferred accounts like 401(k)s, IRAs, and HSAs, bond taxation is moot—you pay tax only on withdrawals. For taxable accounts, a bond ladder of Treasuries can be structured to minimize tax drag. Some investors deliberately hold government bonds in taxable accounts and higher-return equity funds in retirement accounts, maximizing after-tax returns across their portfolio.
The risk of very low or negative real yields
Since 2010, real yields on US Treasuries (the coupon rate minus expected inflation) have spent long stretches below zero. A 10-year Treasury yielding 2.5% with expected inflation of 2.5% offers zero real return. If inflation unexpectedly rises to 3%, your real return turns negative. This was the reality for most long-bond holders from 2010 to 2022: they earned nominal returns but lost purchasing power.
Such an environment pushes investors toward higher-risk assets—stocks, credit, alternatives—in search of real returns. This reach-for-yield dynamic can inflate bubbles in corporate debt and equities. Conversely, when real yields are positive (as they were in 2024, with 10-year Treasuries yielding 4% and inflation expectations around 2.5%), government bonds become far more attractive relative to stocks, and some investors shift allocation away from equities.
Conclusion: The foundation of finance
Government bonds are not exciting, but they are fundamental. They define the discount rate for all other assets, they anchor portfolios, they finance public spending, and they provide a visible measure of what investors believe about the future (low yields suggest low expected growth; high yields suggest the opposite or higher inflation expectations). Whether you buy Treasuries, gilts, bunds, or Japanese Government Bonds, you are buying a piece of the world's most creditworthy issuers and the most liquid securities on the planet. The chapters ahead examine specific types of government bonds—bills, notes, strips, TIPS, and their international counterparts—so you can build a government bond allocation suited to your goals.
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Treasury bills (T-bills) are the shortest-dated government securities, issued in 4-, 8-, 13-, 17-, 26-, and 52-week maturities. Unlike coupon-paying bonds, T-bills are sold at a discount and redeemed at face value, making them the safest and most liquid corner of the government bond market.