Calculate Australian bond price, yield to maturity (YTM), current yield, and Macaulay duration for government and corporate bonds.
| Metric | Value |
|---|
Commonwealth Government Securities (CGS) are issued by the Australian Office of Financial Management (AOFM). AGBs pay semi-annual coupons and are considered risk-free in Australia. They are available through the ASX (maturities 1–30 years) via Exchange-traded AGBs (ETABs).
When market yield rises above the coupon rate, the bond trades at a discount (price < face value). When yield falls below coupon, bond trades at a premium (price > face value). Duration measures interest rate sensitivity.
A bond is a fixed-income debt instrument where an investor lends money to a government or corporation (the issuer) in exchange for periodic interest payments (coupons) and the return of the face value (principal) at maturity. Bonds are core components of balanced and conservative investment portfolios and are the primary way governments and corporations raise debt financing.
| Term | Definition | Example |
|---|---|---|
| Face value (par value) | The principal amount repaid at maturity | $1,000 per bond (standard) |
| Coupon rate | Annual interest paid as % of face value | 4% = $40/year on $1,000 bond |
| Maturity date | When face value is repaid | 10 years from issuance |
| Yield to maturity (YTM) | Total return if held to maturity (market rate) | Varies with bond price |
| Current price | What the bond trades at in market | Above or below par |
Bond prices and yields move in opposite directions — this is the most important concept in bond investing. When interest rates rise, existing bonds become less attractive (they pay lower coupons than new bonds), so their prices fall. When rates fall, existing bonds become more attractive, so their prices rise.
| Scenario | Market Rate Changes | Bond Price | Yield to Maturity |
|---|---|---|---|
| At issuance | Market rate = 4% | $1,000 (at par) | 4% |
| Rates rise | Market rate rises to 6% | Below $1,000 (discount) | 6% |
| Rates fall | Market rate falls to 2% | Above $1,000 (premium) | 2% |
Australian Government Bonds issued by the Australian Office of Financial Management (AOFM) are considered the safest fixed-income investment in Australia — they are backed by the federal government. As of June 2026, 10-year Australian Government Bond yields are approximately 4.3-4.7% p.a. AGBs can be purchased through the ASX (exchange-traded government bonds, ticker codes starting with "GSBS" and "GSBK") or directly through the AOFM retail bond platform.
How do bond prices work in Australia?
Bond prices move inversely to interest rates. A bond paying 4% annual coupon on $1,000 face value generates $40/year. If market rates rise to 6%, investors can get new bonds paying $60/year — so the old 4% bond must sell at a discount (below $1,000) to be competitive. The new lower price raises the effective yield to match market rates.
What is yield to maturity (YTM)?
YTM is the total return an investor receives if they hold a bond to its maturity date, accounting for the purchase price, coupon payments, and the face value repaid at maturity. It is the most useful measure for comparing bonds of different prices and coupon rates. A bond trading above par (premium) has a YTM below its coupon rate; below par (discount) has a YTM above its coupon rate.
Are bonds safe investments in Australia?
Safety varies by bond type. Australian Government Bonds are considered risk-free (backed by the Commonwealth) and are the benchmark for risk-free rates. State government bonds carry minimal risk. Corporate bonds range from investment-grade (low risk, lower yield) to high-yield/junk bonds (higher risk, higher yield). All bonds carry interest rate risk — prices fall when rates rise.
What is the difference between a bond coupon and bond yield?
The coupon rate is fixed at issuance — it is the annual interest payment as a percentage of face value (e.g. 4% = $40 on $1,000). The yield changes daily as the bond's market price fluctuates. If you buy a 4% coupon bond at a discount ($950), your actual yield is higher than 4% because you also gain $50 in price appreciation at maturity.