Abnormal Return in Australia: What Investors Need to Know in 2026

Abnormal return is the difference between an investment’s actual return and its expected return, based on a chosen benchmark. In other words, it shows how much better or worse your investment performed compared to what you might reasonably expect from the market or a similar risk profile.

For example, if the ASX 200 index rises by 5% over a period and your portfolio grows by 8%, your abnormal return is +3%. If your portfolio only grows by 3%, your abnormal return is -2%. This measure helps you separate your own investment decisions from general market movements.

In a market where economic conditions, regulations, and technology are all shifting, abnormal return offers a clearer view of investment performance. It allows you to:

• Evaluate skill: See if your investment choices or your fund manager’s decisions are actually adding value.
• Compare options: Assess whether active management, passive investing, or specific strategies are working for you.
• Adjust strategies: Identify areas where your portfolio is underperforming or outperforming, so you can make informed changes.

Calculating abnormal return is straightforward:

Abnormal Return = Actual Return – Expected Return

The challenge lies in determining the right expected return. This is usually based on a benchmark, such as the ASX 200 for Australian shares, or a blended index if your portfolio includes different asset classes. Some investors use models like the Capital Asset Pricing Model (CAPM) to adjust for risk.

Example:

• You invest $10,000 in a technology-focused ETF.
• Over six months, your ETF returns 12%.
• During the same period, the ASX 200 returns 7%.
• Your abnormal return is 5% (12% - 7%).

Points to consider:

• Choose a relevant benchmark: The benchmark should reflect your investment’s asset class, sector, or style.
• Include all returns: Factor in dividends, franking credits, and fees to get a true picture of performance.
• Consider timeframes: Short-term abnormal returns may be due to luck or market timing, while consistent outperformance over time suggests skill or a sound strategy.

Several developments in 2026 are increasing the focus on abnormal return among Australian investors:

Regulatory Changes

Regulators are encouraging greater transparency in how super funds and managed investments report their performance. This means more investors can see how their returns compare to relevant benchmarks, making abnormal return a key measure for evaluating products.

Active vs. Passive Investing

The debate between active and passive investing continues. While some active funds deliver positive abnormal returns, many struggle to outperform after fees. Abnormal return helps investors judge whether paying for active management is worthwhile.

Technology and New Investment Platforms

The rise of AI-driven trading, thematic ETFs, and micro-investing platforms is creating new opportunities and risks. These innovations can lead to both higher and lower abnormal returns, making it important to track performance against appropriate benchmarks.

Sustainability and ESG Benchmarks

As responsible investing grows, new benchmarks focused on environmental, social, and governance (ESG) factors are emerging. Comparing your portfolio’s abnormal return to these benchmarks can help you assess whether you’re getting value from sustainable investments.

Imagine you’re reviewing a super fund that invests in both Australian and global shares. In a given year:

• The ASX 200 returns 6.8%.
• The global MSCI World Index returns 8.1%.
• The fund, after fees and taxes, returns 7.9%.

If the fund’s expected return, based on its mix of assets, is 7.4%, then its abnormal return is +0.5%. This indicates the fund has outperformed its benchmark by a modest margin, after accounting for costs.

Abnormal return analysis is also used by financial advisers and digital platforms to help investors understand performance and make better decisions. For those seeking professional guidance, insurance brokers and financial advisers can help interpret these figures in the context of broader financial planning.

Here are some practical steps to make abnormal return part of your investment process in 2026:

1. Select the Right Benchmark

Your benchmark should match your investment’s asset class, sector, or investment style. For example, use the ASX 200 for broad Australian shares, or a sector-specific index for a focused portfolio.

2. Look for Consistency

A single period of outperformance may not mean much. Look for a track record of positive abnormal returns over several years to identify genuine skill or a robust strategy.

3. Factor in Costs

Always subtract fees, taxes, and other costs from your returns before calculating abnormal return. This gives you a more accurate picture of net performance.

4. Use Available Tools

Many investment platforms now provide abnormal return data. Use these figures to compare funds, challenge fund managers, or adjust your own portfolio.

5. Understand the Limits

Abnormal return is a useful tool, but it’s not the only measure of success. Consider other factors like risk, diversification, and your own financial goals when making decisions.

What is a good abnormal return?

A positive abnormal return means your investment outperformed its benchmark, but what’s considered "good" depends on your goals, risk tolerance, and investment horizon. Consistent positive abnormal returns over time are generally a sign of effective investment decisions.

Can abnormal return be negative?

Yes. A negative abnormal return means your investment underperformed its benchmark. This can happen for many reasons, including market conditions, fees, or specific investment choices.

How often should I check abnormal return?

It’s useful to review abnormal return at least annually, or when making major investment decisions. Frequent checking can be misleading due to short-term market movements.

Does abnormal return guarantee future performance?

No. Past abnormal returns do not guarantee future results. Use abnormal return as one tool among many to guide your investment decisions.

Abnormal return is a valuable measure for Australian investors in 2026, helping you see beyond market averages and assess the real impact of your investment choices. By understanding how to calculate and interpret abnormal return, you can make more informed decisions and build a portfolio that aligns with your financial goals.