What a government bond actually is

A government bond is a loan you make to a government — federal, state, or local. When you buy a bond, you give money to that government now, and it promises to pay you back with interest on a set date. The government uses that money to pay for things like roads, schools, military operations, or to cover a budget shortfall. You are the lender; the government is the borrower.

The bond itself is a piece of paper or a digital record that says three things: how much you lent (called the principal), what interest rate you'll earn (called the coupon rate), and when you get your money back (called the maturity date). If you buy a $1,000 bond with a 3% coupon that matures in 10 years, the government will pay you $30 per year for 10 years, then give you your $1,000 back at the end.

Key Takeaways

  • When you buy a government bond, you lend money to a government and receive regular interest payments until the bond matures, at which point you get your principal back.
  • The interest rate on a bond is set when it is issued and does not change, even if market interest rates rise or fall after you buy it.
  • You can sell a bond before it matures, but its price will go up or down depending on whether interest rates have risen or fallen since you bought it.
  • Federal bonds are considered very safe because the U.S. government has never defaulted, but state and local bonds carry more risk depending on the issuer's finances.
  • The longer you lend money to a government, the higher the interest rate it typically offers you to compensate for the extra time and risk.

How the interest rate is set and stays fixed

When a government first issues a bond, it decides what interest rate to offer. That rate depends on how much money the government needs to borrow, how long it is asking you to lend for, and what interest rates are in the broader economy at that moment. If the Federal Reserve has raised short-term rates, governments usually have to offer higher rates on their bonds to attract lenders. If rates are low, governments can offer lower rates and still find buyers.

Once you buy the bond, your interest rate is locked in for the life of the bond. If interest rates in the economy rise after you buy, your bond still pays the same rate — which makes it less attractive to other buyers. If interest rates fall, your bond becomes more valuable because it pays more than new bonds being issued. This is why bond prices move in the opposite direction from interest rates.

What happens when you hold a bond to maturity

If you keep the bond until its maturity date, the math is simple. You receive your coupon payments (the interest) on a regular schedule — usually twice a year for federal bonds, though the timing varies. On the maturity date, you get your final coupon payment plus your principal back in full. You have no choice in this; it happens automatically if the government does not default.

The U.S. federal government has never defaulted on its bonds, which is why Treasury bonds are considered one of the safest investments available. State and local governments have occasionally defaulted, though it is rare. When a government does default, bondholders lose some or all of their money.

Selling a bond before maturity and how prices change

You do not have to hold a bond until maturity. You can sell it to another investor at any time on the secondary market — the market where existing bonds trade between investors. The price you get depends on what interest rates are doing and how much time is left until maturity.

If interest rates have fallen since you bought your bond, your bond is worth more because it pays a higher rate than new bonds. A buyer will pay a premium to get that higher payment. If interest rates have risen, your bond is worth less because it pays a lower rate than new bonds. You would have to sell at a discount to find a buyer. The closer a bond is to maturity, the less its price swings because there is less time for interest rates to move.

This is the main risk for bondholders who sell before maturity: if you need to sell when interest rates have risen, you will take a loss. If you hold to maturity, you always get your full principal back regardless of what happened to interest rates in between.

The difference between federal, state, and local bonds

Treasury bonds are issued by the federal government and are considered the safest because the U.S. government backs them with its full taxing power and has never defaulted. They come in different lengths: Treasury bills mature in less than a year, Treasury notes mature in 2 to 10 years, and Treasury bonds mature in 20 to 30 years. Longer maturities pay higher interest rates.

Municipal bonds are issued by states, cities, and other local governments. They typically pay lower interest rates than Treasury bonds because they are riskier — a city or state can run into financial trouble and default. However, the interest you earn on municipal bonds is often exempt from federal income tax, which can make them attractive to higher-income investors. The safety of a municipal bond depends entirely on the financial health of the issuer.

I Bonds are a special type of Treasury bond designed to protect against inflation. The interest rate on an I Bond has two parts: a fixed rate set by the Treasury, and an inflation rate that adjusts every six months based on the Consumer Price Index. I Bonds cannot be sold on the secondary market; you can only redeem them through the Treasury.

Why governments issue bonds instead of raising taxes

Governments issue bonds to spread the cost of large projects or emergencies over time. Instead of raising taxes immediately to pay for a new highway or to cover a budget gap, a government can borrow money now and repay it over decades. This lets current taxpayers and future taxpayers share the burden.

Bonds also allow governments to borrow money from investors all over the world, not just from their own citizens. The U.S. Treasury sells bonds to investors in Japan, China, Europe, and elsewhere. This global market for government debt is enormous and helps keep borrowing costs lower than they would be if governments could only borrow domestically.

How inflation affects what your bond is worth

If you buy a bond paying 3% interest and inflation rises to 4%, your purchasing power is actually declining — you are earning less in real terms than you are paying in lost value. This is why longer-term bonds pay higher interest rates: lenders demand extra compensation for the risk that inflation will erode their returns over a longer period.

This is also why I Bonds exist. Because their interest rate adjusts for inflation every six months, they protect you against inflation risk. Regular Treasury bonds do not adjust, so if inflation rises unexpectedly after you buy, you are stuck with a lower real return. This is a real cost to bondholders, though it is not the same as a default.

Frequently Asked Questions

Can I lose money on a government bond?

If you hold a bond to maturity and the government does not default, you get your full principal back — no loss. If you sell before maturity and interest rates have risen, you will sell at a discount and lose money. If inflation rises significantly, your purchasing power declines even though you get your nominal dollars back. Federal bonds are very safe; state and local bonds carry default risk depending on the issuer.

What is the difference between a bond's coupon rate and its yield?

The coupon rate is the interest rate printed on the bond when it is issued — it never changes. The yield is the actual return you earn, which depends on what price you paid for the bond. If you buy a bond at a discount (below face value), your yield is higher than the coupon rate. If you buy at a premium (above face value), your yield is lower. At maturity, yield and coupon converge.

Why do bond prices fall when interest rates rise?

New bonds issued at higher rates become more attractive to buyers than your older bond paying a lower rate. To compete, your bond's price must fall so that its yield matches the new market rate. The longer your bond's maturity, the bigger the price drop because there is more time for the interest rate difference to matter.

How do I buy government bonds?

You can buy Treasury bonds directly from the U.S. Treasury through TreasuryDirect.gov with no fees. You can also buy them through a brokerage account. Municipal bonds are typically bought through a broker. I Bonds can only be purchased through TreasuryDirect and require a Social Security number and a U.S. bank account.

Is a government bond the same as a savings bond?

No. A savings bond is a type of bond issued by the government, but it works differently — you cannot sell it on the secondary market, and the interest rate may adjust. Series I Savings Bonds and Series EE Savings Bonds are the most common types. They are designed for individual savers rather than institutional investors.