Building a Diversified Portfolio for Long-Term Wealth

Building a diversified portfolio is an important part of achieving long-term wealth, yet many investors overlook the importance of diversification when constructing their portfolios (Rajesh Babu Dasari, 2025).

This article will display why diversification matters in concrete, measurable terms, where Australian portfolios most often fall short of it, and what the numbers say about a more considered allocation (Pitcher Partners, 2025).

The Numbers Behind Diversification

The benefits of diversification are supported by decades of market data. While Australian and international equities have historically produced similar long-term returns, they are not perfectly correlated, meaning they do not always move in the same direction. Combining both markets has therefore helped investors reduce portfolio volatility without significantly sacrificing returns.

Over the past thirty years, Australian and international equities have delivered comparable long-term performance, with both markets generating average annual returns of approximately 8.0% to 8.5% (Campbell Wallace, 2026).

has trailed global equities by roughly 2 to 3 percentage points a year, largely due to Australia’s thin exposure to fast-growing sectors like technology, however the gap widens over a shorter timeframe (Campbell Wallace, 2026).

The Home Advantage

Allocation of Australian equities largely depends on what benefits an investor has access to. For domestic investors, franking makes a significant difference in capital allocation.

Franking credits pass tax already paid by an Australian company on its profits through to shareholders via the dividend. For an Australian resident taxpayer, this lifts the after tax return on domestic shares relative to an equivalent unfranked return earned offshore.

Any comparison between Australian and international allocations needs to account for that before drawing conclusions.

The market cap figures on their own can mislead if read alone. Australia is approximately 2% of global sharemarket value, and the MSCI World Index allocates just 1.92% to Australia (Campbell Wallace, 2026). That figure represents a pre tax world. It’s a market cap weighting,

not a return on capital after tax weighting for an Australian investor. Once franking is factored in, academic modeling puts the optimal domestic allocation for an Australian investor between 30% and 40% (Mark LaMonica, 2025).

AustralianSuper’s Balanced option holds around 25% Australian equities and UniSuper’s Growth option around 31% (Campbell Wallace, 2026). Against the unfranked 2% market cap weight, these allocations look like a large overweight. Against the franking adjusted 30-40% range, they sit almost just below it.

The biggest of bets: Sector Concentration on the ASX

Franking explains why Australian investors reasonably hold more local shares than a pure market cap view would suggest. It doesn’t, however, address the larger problem of what a largely Australian portfolio is made of.

Unlike most major global equity markets, the Australian sharemarket is heavily concentrated in financials and materials. Together, these two sectors account for well over half of the ASX 200, while industrials make up just 7.4% of the index and technology less than 2.1% (S&P Global, 2026).

The MSCI World Index gives technology, healthcare and industrials a far larger share of market capitalisation, and those sectors have driven much of global earnings growth over the past decade (. Many of the world’s largest technology companies don’t exist at a meaningful scale on the ASX.

As a result, the portfolio which is 100% ASX-listed is effectively a leveraged bet on Australian bank earnings and commodity prices, with limited exposure to the sectors that have generated much of the world’s equity growth.

Currency Risk: The Overlooked Variable

Any international allocation held unhedged is, implicitly, a position on the Australian dollar. If the AUD weakens against the currencies an investor is exposed to, predominantly the US dollar, unhedged offshore holdings are worth more once converted back – adding to the underlying market return. If the AUD strengthens, the opposite happens, and currency movements can erode or reverse a period of otherwise strong offshore performance.

The Australian dollar has historically been a volatile currency as it is closely tied to commodity prices and global risk sentiment (RBA). Tat volatility cuts both ways, which is why many international ETFs and managed funds offer both hedged and unhedged versions (Macquarie,

2025). Currency exposure is a separate decision from the domestic/international split that warrants careful consideration.

So What Does a Reasonable Split Look Like?

There is no single figure that applies universally, and any claim to the contrary should be treated with some scepticism. That said, industry modelling across a range of providers suggests a sensible range for long-term investors of approximately 40% to 60% domestic equity exposure, with the remainder allocated offshore. That is a considerably lighter domestic weighting than most Australian investors carry by default.

There’s also a generational shift underway. International share ownership among 18 to 24 year olds grew at almost double the rate seen among older investors between 2020 and 2023 (AXIS, 2026).

Domestic allocation is an important decision and it is sized against the franking credit benefit, sector concentration risk and currency exposure.

For help with managing your portfolio, contact us today.

Happy Investing!

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