Fixed Interest: Stability, Income and Portfolio Balance
This asset class guide to fixed interest is designed to help our clients better understand its role and effectiveness in portfolio construction.
When markets are volatile, many investors ask the same question: “Should I have more in fixed interest?”
Fixed interest investments – commonly known as bonds – are a core component of diversified portfolios. They are not designed to be exciting; rather, they provide stability, income and risk management. For newer investors, those planning for retirement, and retirees alike, understanding how fixed interest works can improve confidence and decision-making.
What Is Fixed Interest?
A fixed interest investment is essentially a loan made by you, the investor, to:
- The Australian Government
- A state government
- A bank, or
- A company
In return, the issuer agrees to:
- Pay regular interest (known as a coupon)
- Return your capital at a specified maturity date
Examples include Australian Government Bonds issued via the Australian Office of Financial Management and bonds traded on the Australian Securities Exchange.
Why Fixed Interest Is Used in Portfolios
Fixed interest is not typically used to chase high returns. Its primary roles are to:
- Reduce portfolio volatility
- Preserve capital
- Provide a consistent income stream
- Diversify away from shares
Research consistently shows that portfolios including high-quality bonds tend to experience smaller declines during equity market downturns compared with share-only portfolios—an increasingly important consideration as retirement approaches.
The Benefits of Fixed Interest Investments
1. More Predictable Income
Bonds provide regular interest payments that can:
- Support retirement cash flow
- Supplement pension entitlements
- Provide stability during market volatility
Government bonds, in particular, are generally considered highly secure due to sovereign backing. For investors prioritising income certainty over growth, this predictability is valuable.
2. Lower Volatility Than Shares
Shares can experience significant price fluctuations, whereas bonds typically exhibit more stable behaviour. This makes fixed interest particularly suitable for:
- Investors approaching retirement
- Those uncomfortable with market volatility
- Portfolios seeking smoother return profiles
Lower volatility can also help reduce emotionally driven investment decisions during market downturns.
3. Diversification During Market Stress
High-quality government bonds often behave differently from shares, particularly during periods of economic stress.
For example, during the Global Financial Crisis, many government bonds increased in value while share markets declined.
While diversification does not eliminate risk, it can meaningfully reduce overall portfolio volatility.
4. Improved Yields in the Current Environment
Following an extended period of low interest rates after the GFC, bond yields have risen materially in recent years. Higher yields result in:
- Increased income
- Improved forward return expectations compared to the 2010s
This shift has renewed interest in fixed interest among investors, particularly those focused on income and capital stability.
The Risks and Limitations of Fixed Interest
It is important to recognise that bonds are not risk-free. They carry different risks to shares.
1. Interest Rate Risk
When interest rates rise, bond prices fall.
In 2022, global bonds experienced one of their weakest years in decades due to rapid increases in interest rates. Longer-term bonds are generally more sensitive to these changes.
2. Inflation Risk
Inflation reduces the real value of fixed interest payments.
Inflation-linked bonds can help mitigate this risk, although they often begin with lower yields.
3. Credit Risk
Corporate bonds depend on the financial strength of the issuer.
Higher-yielding bonds typically carry higher default risk, which is why careful selection and diversification are critical.
4. Lower Long-Term Growth Than Shares
Over the long term, shares have historically delivered higher returns than bonds.
For younger investors, holding excessive fixed interest may limit long-term wealth accumulation.
How Fixed Interest Fits at Different Life Stages
New Investors
Can benefit from –
- Helps smooth early investment experiences
- Builds confidence during market volatility
- Reduces large portfolio swings
Growth assets will generally remain the dominant allocation at this stage.
Pre-Retirement Investors
In the decade leading up to retirement, fixed interest becomes increasingly important. It can:
- Reduce sequencing risk
- Protect capital before retirement
- Improve portfolio balance
Gradually increasing exposure is a common and prudent strategy.
Retirees
For retirees drawing income from their portfolios:
- Stability becomes more important than maximum growth
- Capital preservation is critical
- Avoiding forced sales of growth assets during downturns is essential
A well-structured allocation to fixed interest can provide a buffer, allowing growth assets time to recover.
The Bottom Line
Fixed interest investments are not designed to outperform shares over the long term. Their purpose is to:
- Provide income
- Reduce volatility
- Preserve capital
- Enhance diversification
They may underperform when:
- Interest rates rise rapidly
- Inflation remains elevated
- Share markets are strongly rising
For most investors, the key question is not whether to include fixed interest—but how much, and in what form.
This depends on your:
- Time horizon
- Income requirements
- Risk tolerance
- Stage of life
A tailored approach remains essential.
Understand how fixed interest fits your portfolio
The role of fixed interest within a portfolio will vary depending on your goals, time horizon and income needs. If you would like tailored advice on how to structure your investments to balance growth, income and risk, arrange a meeting with one of our experienced financial advisers: either
- phone our office on 07-3421 3456, or
- at your convenience, use the linked Book a Meeting facility.
(This article was first posted by us in March 2026.)