What are bonds, how do they work, and why does the bond market matter?

Bond markets are getting a lot of attention at the moment. They help shape interest rates, which can flow through into mortgages, superannuation returns, business investment and government budgets.

Some bonds can also be bought by everyday investors and many people are exposed to them indirectly through their super. 

But many people are not familiar with what bonds are, or how the markets around them work. So, let’s see what they’re all about.

What is a bond? 

Put simply, a bond is a financial contract that provides a mechanism to borrow capital. When an investor buys a bond, they are lending money to whoever issued it. In return, the borrower promises to make regular interest payments and repay the original amount at the end of a fixed term.

So if the Australian Government sells a 10-year bond, investors are lending money to the government for 10 years. 

How is a bond different from a normal loan?

A normal loan, like one for a car or renovation, usually stays between the same borrower and lender over its term.  

A bond can work differently, with the bond’s initial buyer often able to sell it to someone else. The borrower still has to make the payments, but the person or institution receiving those payments can change.

That creates a bond market, with investors buying and sell existing bonds, and each trade helping set a market price. 

Someone might sell a bond because they need cash, want to reduce risk, or think they can get a better return somewhere else. They might buy a bond because they want the regular payments, trust the borrower, or think the price has fallen enough to make the return attractive.

How are bonds sold? 

Bonds are often sold through auctions or tenders, meaning the price can go up and down with demand as investors bid for a piece of the bond. 

If lots of investors want the bond, the borrower may be able to offer a lower interest rate, making their borrowing cheaper. If investors are less keen, a higher return might need to be offered to attract enough buyers, making borrowing more expensive. 

Bond prices vs bond yields

When people talk about the cost of borrowing, they normally mean interest rates, but in the bond market, that return is usually called the “yield to maturity”, often simply referred to as the the yield.  

That means there are usually two “prices” discussed for bonds: the price the investor pays to buy it, and the yield to maturity, which is the annual return they expect from it.

A bond’s price is based on what investors are willing to pay today for money they expect to receive in the future. Those future payments usually include the regular interest payments throughout the term of the bond, as well as the final repayment. 

The safer and more attractive those payments look, the more investors may be willing to pay for the bond. If they look risky, a higher yield may be required to entice investors, which is one reason government bond yields are sometimes used as a proxy measure of economic confidence. 

A simple example 

• Imagine the government sells a bond for $100.
• The bond pays $4 a year (a 4% yield), and the government promises to repay the $100 at the end. 
• If investors are happy with that return, they might pay the full $100.
• But now imagine interest rates rise. New bonds are offering investors a higher return of 5%, because the price of borrowing money has gone up. 
• The old bond still pays only $4 a year. So, investors may not want to pay $100 for it anymore. They might only be willing to pay $80.
• At $80, that same $4 yearly payment is now worth 5 per cent of the price paid. 

That’s why bond prices and bond yields usually move in opposite directions. When the bond price falls, the return for the next buyer rises. When the bond price rises, the return for the next buyer falls.

What affects the return offered on a new bond? 

When a government, bank or company sells a new bond, it has to offer enough return to attract buyers. Several things can influence the rate it sets. 

• The cash rate: In Australia, that’s the interest rate set by the RBA. It has a big influence on short-term interest rates and on what investors expect other interest rates to do. 
• Inflation: If prices are rising quickly, investors usually want a higher return, because the money they receive in the future may not buy as much as it does today.
• Time: Lending money for 10 years is usually riskier than lending it for one year. 
• Trust: A borrower seen as safer can usually borrow more cheaply than a borrower seen as riskier.
• Supply and demand: If a government or company needs to borrow a lot of money, it may need to offer a higher return to attract enough buyers.  

Different types of bonds

The bonds most often mentioned in the news are government bonds, like US government Treasuries, which are normally traded by big investors like super funds and banks. 

But governments will sometimes also issue bonds designed for everyday investors. During wartime for example, Australian governments have asked the public to lend directly by buying war bonds or similar products. Australian Savings Bonds, often marketed as “Aussie Bonds”, were sold to direct savers in the early 1980s. 

In Australia, some federal government bonds can also be bought and sold on the ASX.  

Corporate bonds issued by companies can offer higher returns than government bonds, but usually come with more risk. Corporate bonds are mostly issued and traded outside the sharemarket, and the minimum amount required to buy them can be large.

Why are bonds in the news right now?

Bond markets are being watched closely at the moment because, in an uncertain economy, investors are trying to work out where inflation, interest rates and government borrowing are heading next. 

Higher bond yields usually suggest investors expect stronger growth, higher inflation, higher interest rates, or greater risk.

On 5 May 2026, the Reserve Bank lifted the cash rate target by 25 basis points to 4.35 per cent. It said inflation had picked up, higher fuel and commodity prices were adding to inflation, and financial conditions had tightened, including through higher government bond yields. 

Bond yields have also been high by recent standards. CommBank’s April 2026 Market Outlook said Australian 10-year government bond yields had moved to their highest level since 2011, reflecting a broader global shift as markets priced in higher inflation risks and less confidence in near-term US rate cuts.

There is also a budget angle. The federal agency that issues Australia’s government bonds, the Australian Office of Financial Management (AOFM) expects the federal government to borrow about $125 billion through Treasury Bonds, including Green Treasury Bonds, in 2026-27. 

CBA’s Head of Market Strategy and Rates Research Adam Donaldson says that number matters because it is lower than investors had been expecting a year earlier, and because Australia’s longer-term debt position looks more manageable than in many comparable countries.

What's moving bond markets now? 

Two main forces are pulling on bond markets. One is inflation. If investors think inflation will stay high, they usually ask for a higher return so their “real” return isn’t eaten away by higher prices. That can push bond yields up and make new borrowing more expensive.

The other is demand. If enough investors want Australian bonds, including buyers overseas, that can help absorb the amount of money governments, banks and companies need to borrow. 

CBA’s Donaldson says Australia is benefiting from that second force. His view is that the federal government is expected to need less new borrowing than investors previously thought, and that Australia’s debt compared with the size of the economy looks more manageable than in many comparable countries.

That matters because bond markets are partly about trust. If investors see Australia as a reliable borrower, they may be willing to buy its bonds at a lower return than they would demand from a riskier borrower, making it cheaper for the government to borrow. 

Donaldson also points to growing demand for bonds in Australian dollars beyond federal government bonds. That includes state government bonds, company bonds and bank debt.

If that continues, it could make Australia’s bond market larger and more active. It could also give borrowers more options when they need to raise money, and it could make Australia more attractive to global investors. 

How bonds affect Australia’s everyday economy

The links between bonds and the economy most Australians experience in their everyday lives are indirect but important. 

For mortgages, variable rates are most directly linked to the RBA cash rate. But fixed mortgage rates are more closely connected to bond markets, because banks look at the cost of borrowing money for a set period. 

For super, bonds can affect returns even if you never buy a bond yourself. Many super funds hold bonds because they can provide income and balance against riskier assets.  

For businesses, higher bond yields can make borrowing more expensive. That can affect whether companies expand, hire, build or invest.

For taxpayers, bond yields matter because governments borrow by selling bonds. If new bonds have to offer higher returns, the interest bill on new government borrowing can rise. That can affect future budgets, because more money may need to go toward interest costs. 

For the Australian dollar, demand for Australian bonds can also matter. More overseas demand for bonds in Australian dollars can support demand for the currency, although the exchange rate is also moved by many other forces.

Bottom line 

Bond markets matter because they help shape interest rates across the economy. Even if you never buy a bond, they can flow through to mortgages, super, business costs, government budgets and investment decisions.