Government Bonds

A government bond is a debt security issued by a national government to borrow money from investors. The buyer lends the state a sum of money; in return the government promises to pay interest, usually as a regular coupon, and to repay the face value on a fixed maturity date. Governments use these bonds to cover the gap between tax revenue and public spending, to refinance older debt and to manage cash through the year.

Government bonds sit at the centre of most financial systems. Debt issued in a country's own currency by a stable state is treated as close to free of default risk, so its yield serves as the risk-free rate against which loans, mortgages and corporate debt are priced. Short-dated government paper is usually called a bill, medium-dated paper a note, and long-dated paper a bond, though usage varies by country. Issuance is normally run by a finance ministry or a debt management office, often with the central bank acting as agent.

Think of a government bond as an IOU from the state. You hand over money today, the government writes you a promise to pay you a set amount of interest every year, and on an agreed date it gives your original money back. Because a government can raise taxes and, in its own currency, runs the central bank, people treat its promise as one of the safest available.

These IOUs can also be sold to someone else before they are due. If new IOUs start paying more interest, an old one paying less becomes less attractive, so its price falls. That simple see-saw between price and interest is the main thing that moves government bond markets from day to day.

Most governments sell bonds through regular auctions in the primary market. A published calendar tells investors in advance how much of each maturity will be offered. Bids come mainly from primary dealers, banks that have agreed to take part in every auction and to make markets afterwards. Once issued, the bonds trade in the secondary market, largely over the counter between dealers and institutional investors such as pension funds, insurers, banks and foreign reserve managers.

Some examples of national programmes:

• United States. The Treasury issues Treasury bills of up to one year, Treasury notes of two to ten years and Treasury bonds of 20 and 30 years, together known as Treasury securities.
• United Kingdom. The UK Debt Management Office issues gilts, including index-linked gilts whose payments rise with inflation.
• Euro area. Each member state issues its own debt, such as German Bunds, French OATs and Italian BTPs, all denominated in euros but carrying different yields.
• Pakistan. The State Bank of Pakistan auctions Market Treasury Bills and Pakistan Investment Bonds on behalf of the finance ministry, alongside government Ijara sukuk for Islamic investors.

Government debt comes in several structures. The most common pays a fixed rate set by the coupon rate at issue. A zero-coupon bond pays no coupon and is sold at a discount to its face value; short bills work this way. A floating rate note resets its interest periodically in line with a short-term reference rate. Inflation-linked bonds, such as US Treasury Inflation-Protected Securities (first issued in 1997) and UK index-linked gilts (first issued in 1981), adjust principal or payments with a price index, a form of indexation. Governments may also borrow in foreign currencies, including through Eurobonds, which creates foreign currency debt that cannot be repaid by printing money. Retail savings bonds and historical war bonds were sold directly to households.

The government yield curve, which plots yields across maturities, is the reference point for pricing almost every other credit in the economy. Bonds are also the main instrument of monetary policy plumbing. Central banks buy them in quantitative easing and run them off or sell them in quantitative tightening, and banks pledge them as collateral in repo transactions to raise short-term cash. Regulators count high-quality government bonds as liquid assets that banks can sell quickly in stress.

For fiscal policy, the stock of outstanding bonds forms most of the national debt, and the yields investors demand determine the cost of government borrowing. Some economists argue that heavy issuance can push up interest rates and squeeze private investment, an effect known as crowding out; others reply that the effect is small when an economy has spare capacity.

• Interest rate risk. When market rates rise, existing bond prices fall. The rapid rise in rates in 2022 left banks with large unrealized losses, a factor in the failure of Silicon Valley Bank in March 2023. This is the core of interest rate risk.
• Inflation risk. Fixed payments lose purchasing power when inflation runs above what investors expected.
• Credit risk. A government can fail to pay, especially on debt in a currency it does not issue. Greece's 2012 restructuring of privately held debt was one of the largest sovereign defaults. Agencies publish a credit rating for each state to signal this sovereign risk.
• Liquidity and market stress. In September 2022 a sharp sell-off in UK gilts forced pension funds using liability-driven strategies to sell assets, and the Bank of England stepped in with temporary purchases to restore orderly trading.

• TreasuryDirect (US Department of the Treasury)
• UK Debt Management Office