Australian Government Bonds vs Corporate Bonds: Key Differences Explained

Last reviewed: May 2026

An Australian Government Bond and a corporate bond from a major ASX company look similar on the surface. Both pay you interest. Both have maturity dates. Both trade on markets.

But underneath, they're quite different. And for an Australian investor building a portfolio, understanding those differences is the difference between a sensible allocation and a reckless one.

We think too many investors treat AGBs and corporate bonds as interchangeable. They're not.

What's the fundamental difference? Credit risk

This is the key distinction.

An AGB is backed by the Australian government's taxing power. If the government issues a bond paying a 3.5% coupon, it can raise taxes, adjust spending, or borrow more to ensure it pays you on time. The government won't default on its own currency denominated debt.

A corporate bond is backed by a company's cashflows and assets. If the company hits trouble, demand collapses, a major customer walks, or a lawsuit hits, it might not be able to pay the coupon. Or worse, it might default entirely and you lose capital.

This difference in credit risk is the root cause of every other difference between the two asset classes.

How big is the yield premium?

Right now (May 2026), Australian Government Bonds maturing in 10 years yield around 3.5%-3.8%. High-quality corporate bonds of similar maturity yield 4.5%-5.5%.

That 1%-1.5% gap is the credit risk premium. The market is saying: "We'll pay you 1% more per year to accept the risk that this company might hit trouble."

Is that 1% worth it? That depends on the company and your view of the economy.

In a strong economy with low unemployment and healthy corporate earnings, companies are unlikely to default. That 1% premium feels generous, you're being paid well to take on a risk that's unlikely to materialise.

In a weak economy, with rising unemployment and earnings under pressure, that 1% premium might not be enough. You're accepting a higher default risk without adequate compensation.

The market reprices this constantly. That's why corporate bond yields widen (move further away from government yields) in recessions and tighten (move closer to government yields) in expansions.

How does liquidity compare?

Australian Government Bonds are highly liquid. The secondary market for AGBs is deep and active. You can buy or sell any day the ASX is open at a tight bid-ask spread (the difference between the price someone will pay and the price someone will sell for).

Corporate bonds are less liquid. The secondary market exists, but it's thinner. If you want to sell a corporate bond before maturity, you might face a wider bid-ask spread, or you might wait days to find a buyer.

This matters if you think you might need access to your capital before the bond matures.

For a buy-and-hold investor, liquidity is irrelevant. You're holding to maturity anyway. But if there's any chance you'll need to sell, AGBs are the safer bet.

What about minimum investment?

AGBs and corporate bonds can be bought directly via platforms like FIIG or the ASX, but minimum investment requirements differ slightly.

AGBs: Minimum investment is usually $1,000-$10,000 per bond, depending on the platform.

Corporate bonds: Minimum investment is typically $10,000-$25,000 per bond, depending on the issuer and platform.

For a beginning investor with $20,000 to invest, you can buy 2 different AGBs. You can probably buy only 1-2 corporate bonds. This is why corporate bonds require a larger investment base to diversify properly.

How do volatility and price sensitivity differ?

Both AGBs and corporate bonds are sensitive to interest rate movements. When rates rise, bond prices fall. When rates fall, bond prices rise.

But corporate bonds tend to be slightly more volatile because they have both interest rate risk and credit risk. In a recession, corporate bond prices can fall hard because the market reprices both factors: interest rates might fall (good for bonds) but credit risk widens dramatically (bad for bonds).

AGBs are also volatile in a recession, but usually in only one direction: prices rise because the RBA is expected to cut rates.

In the 2020 COVID crash, AGBs outperformed corporate bonds by a meaningful margin in the initial panic phase. Investors ditched corporate bonds for the safety of government bonds.

What about tax treatment?

Both AGBs and corporate bonds are taxed similarly as interest income: at your marginal rate in your personal name, with 50% capital gains discount on any price appreciation (if held more than 12 months).

The main tax consideration isn't between AGBs and corporate bonds, but between your personal portfolio and your SMSF. Interest income inside an SMSF is taxed at 15% (the fund tax rate), regardless of which bonds you hold. This means bonds are relatively more attractive in an SMSF than dividend stocks (which can benefit from franking credits and are taxed at 15% after franking grossed-up).

For your personal portfolio outside super, the tax treatment is the same for both bond types.

Who does each type suit?

Australian Government Bonds are ideal for:

Conservative investors who prioritise capital preservation, investors nearing or in retirement who need certainty, SMSF members who want simple low-risk fixed income, anyone who might need to sell their bonds before maturity, investors uncomfortable with credit analysis, and those who want to "set and forget" with minimal monitoring.

Corporate bonds are ideal for:

Income-focused investors willing to accept moderate credit risk, those with time and skill (or a trusted adviser) for credit analysis, investors committed to holding to maturity, those seeking higher yield than government bonds offer, investors with $100,000+ to deploy in bonds (allows meaningful diversification), and those confident in the economic cycle.

How do you access each in Australia?

Australian Government Bonds

Option 1: Buy directly via FIIG (fiig.com.au). They have a wide range of AGBs at various maturities.

Option 2: Buy via the ASX. AGBs trade like shares. Use any ASX-licensed broker.

Option 3: Buy through a bank. Major banks often offer AGB investment services, though fees can be higher.

Option 4: Buy via a bond ETF that tracks government bonds. Simplest for small investors.

Corporate bonds

Option 1: Buy directly via FIIG. They have an extensive range of Australian corporate bonds from quality issuers.

Option 2: Buy via the ASX. Some corporate bonds trade here, but the selection is more limited than government bonds.

Option 3: Buy via a corporate bond ETF or LIC. Best for diversification without doing your own research.

Option 4: Work with a financial adviser who has wholesale access to corporate bond markets. Advisers can sometimes access bonds not available to retail investors.

For most individual investors, FIIG is the simplest entry point. They've done the credit work for you; you're just choosing which bonds to buy.

What role does each play in a portfolio?

AGBs

AGBs form the defensive backbone of a balanced portfolio. They're the part of your portfolio that stays calm when everything else is panicking.

In a well-constructed portfolio, AGBs are the ballast that lets you stay the course during a market crash.

We'd typically allocate 60-100% of your fixed-income allocation to AGBs (depending on your risk tolerance and time horizon), with the remaining to corporate bonds or other credit.

Corporate bonds

Corporate bonds are the yield-enhancing layer of your fixed-income allocation. They're where you capture the extra return in a healthy economic environment.

But they're only appropriate if you have the capital to diversify and the conviction (or skill) to hold through cycles when spreads widen.

In your portfolio, corporate bonds might represent 30-40% of your fixed-income allocation. More than that and you're concentrated. Less and you're leaving yield on the table.

What does the current environment (2026) mean for bond investors?

Right now, the Australian economic backdrop is mixed. Growth is slowing, but inflation is moderating. The RBA has paused rate rises and is holding steady.

In this environment, AGBs are attractive for their simplicity and safety. Yields have moved away from historic lows, so you're not locking in absurdly low coupons.

Corporate bonds are also attractive, but you need to be selective. The economic slowdown is hitting some sectors harder than others. A bank bond is very different from a retail company bond in a slowing economy.

Frankly, this is an environment where many investors would be wise to tilt slightly more toward AGBs and less toward corporate bonds than they might in a boom cycle. The risk-reward in corporate bonds is less compelling when growth is uncertain.

Building your fixed-income allocation

Here's a practical framework:

Portfolio Type	AGBs	Corporate Bonds	Notes
Conservative (age 50+, near retirement)	80%	20%	High-quality corporates only
Moderate (age 35-50, medium risk)	60%	40%	Investment-grade mix
Growth (age <35, high risk tolerance)	50%	50%	Or less fixed income overall

These are guidelines. Your actual allocation should be based on your specific circumstances, timeline, and goals.

And here's the key insight: AGBs aren't boring because they're bad. They're boring because they work. They do their job, providing stability and income, without drama. That's a feature, not a bug.

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