How to Build a Share Portfolio in Australia: Asset Allocation, ETFs, Franking Credits and Rebalancing

Asset allocation - the split between growth assets (shares, property) and defensive assets (bonds, cash) - determines approximately 90% of a portfolio's long-term return and volatility, according to academic research spanning decades. Stock selection and market timing decisions account for the remaining variation. Getting your asset allocation right matters far more than picking individual stocks.

For long-term investors (10+ year horizon with no near-term requirement for funds), a growth-oriented allocation of 70–100% in equities is supported by historical evidence - Australian and global share markets have outperformed cash and bonds over every 20-year rolling period since reliable data began. For investors approaching a drawdown phase (retirement within 5–10 years), a defensive tilt (40–60% equities) reduces sequencing risk - the risk of poor returns in the years immediately before or after retirement.

A simple starting framework for a long-term Australian investor: 40–50% Australian shares, 40–50% international shares (developed markets), 5–10% emerging markets. This gives domestic currency exposure, franking credit access, and global diversification. Add bonds or cash as you approach your drawdown phase.

Australian shares offer two advantages unavailable from international equities: franking credits (tax offsets attached to dividends from Australian companies that have already paid corporate tax) and currency alignment (Australian-listed assets eliminate foreign currency translation risk). The ASX 200 also skews toward high-yielding, dividend-paying companies - banks, miners, and real estate investment trusts (REITs) - which suits income-focused investors.

The Australian market's concentration is its primary weakness: the ASX is approximately 30–35% financial sector (the four major banks) and 25–30% materials (mining). By contrast, global markets give exposure to technology, healthcare, consumer, and industrial sectors underrepresented on the ASX. A portfolio of 100% Australian shares is not diversified - it is heavily concentrated in two sectors.

International shares held in Australian-listed ETFs (e.g., Vanguard's VGS, iShares' IVV) provide global sector diversification in a domestic tax wrapper. Currency exposure is part of the investment - the Australian dollar fluctuating against the USD and EUR creates volatility but also acts as a partial portfolio hedge (AUD typically falls in global risk-off environments, cushioning the AUD value of international holdings).

A practical allocation: 40% Australian shares, 40% global developed markets, 10% emerging markets, 10% bonds or cash. Adjust the bond/cash component based on your time horizon and risk tolerance.

Exchange-traded funds (ETFs) and listed investment companies (LICs) are both ASX-listed vehicles that provide diversified exposure to a portfolio of underlying assets. The key differences lie in structure, pricing, and tax treatment.

ETFs are open-ended: market makers create and redeem units to keep the ETF's market price close to its net asset value (NAV). This means ETFs rarely trade at significant premiums or discounts. Major Australian ETFs - Vanguard's VAS (Australian shares), VGS (global shares), iShares' IVV (S&P 500), and Betashares' NDQ (Nasdaq 100) - have low management expense ratios (MERs) typically 0.07–0.48% per annum. ETFs distribute income (dividends, interest, capital gains) to unitholders, who include them in their own tax return.

LICs are closed-ended companies: a fixed number of shares are issued at IPO, and shares trade based on supply and demand. LICs can trade at a discount or premium to their underlying NTA (net tangible assets). Some Australian LICs - Australian Foundation Investment Company (AFIC), Argo Investments, Milton Corporation - have been operating for 50–80 years and have strong dividend histories with fully franked distributions. LICs can smooth their dividend payments by retaining profits in good years and drawing on them in lean years - a feature ETFs cannot replicate.

For most investors, low-cost broad-market ETFs (VAS, VGS) are the default recommendation: lower fees, tight NAV tracking, no discount risk, and passive broad-market exposure. LICs are worth considering if: you specifically want smoothed franked dividends; you are investing a large lump sum and the LIC is trading at a significant NTA discount; or you prefer active management within an ASX-listed vehicle.

Franking credits (imputation credits) are attached to dividends paid by Australian companies that have already paid Australian corporate tax at 30% (or 25% for base rate entities). When you receive a franked dividend, you receive both the cash dividend and a credit representing the tax already paid by the company. This credit offsets your personal income tax liability on the dividend income.

Example: a fully franked $70 dividend from an Australian company has a $30 franking credit attached (30% corporate tax). You declare $100 as assessable income (the grossed-up dividend), and receive a $30 tax credit. If your marginal rate is 32.5%, you pay $32.50 in tax on the $100 income, offset by the $30 franking credit - net tax of $2.50. If your marginal rate is 19% (lower-income earner), the $30 credit exceeds your $19 tax liability, and the ATO refunds the difference.

Franking credits are most valuable for: retirees with low taxable income (who receive full refunds); investors in the 19–32.5% marginal rate brackets (who pay little or no additional tax on franked dividends); and SMSF funds in accumulation phase (15% tax rate, so most of the 30% credit is refunded). For investors on the top 47% marginal rate, franking credits still reduce the net dividend tax from 47% to 17% (47% marginal minus 30% credit).

Australian share ETFs like VAS pass through franked dividends - the ETF's quarterly distributions carry the franking credits proportionate to the underlying portfolio's franking level. This means you access franking credits without picking individual Australian stocks.

Over time, different portfolio components grow at different rates - your actual allocation will drift from your target. Rebalancing is the process of restoring the target allocation by selling over-weight assets and buying under-weight ones.

Rebalancing matters because it enforces a systematic buy-low, sell-high discipline: you sell assets that have grown beyond their target weight (sold at higher prices) and buy assets that have lagged (bought at lower prices). Without rebalancing, a portfolio that starts at 70% equities will drift toward 85–90% equities in a sustained bull market, taking on more risk than intended.

For Australian investors, tax is the key rebalancing consideration. Selling assets that have appreciated triggers capital gains tax - for assets held more than 12 months, a 50% CGT discount applies, but CGT is still a real cost. Strategies to rebalance tax-efficiently: (1) direct new contributions (salary, dividends reinvested) to under-weight assets rather than selling over-weight ones; (2) rebalance inside your SMSF in accumulation phase (15% CGT rate, 50% discount applies); (3) set rebalancing thresholds (e.g., rebalance when any asset class drifts 5% or more from target) rather than calendar-based rebalancing.

Annual rebalancing is excessive for most investors - transaction costs and CGT outweigh the benefits of precise allocation tracking. Threshold-based rebalancing (triggered when drift exceeds 5%) with new contributions directed to lagging assets is the most tax-efficient approach for most Australian investors.

Step 1: Open a brokerage account. Major low-cost options in Australia include CommSec Pocket (low minimums, limited ETF range), SelfWealth (flat $9.50 brokerage), and Stake (low-cost with US market access). For long-term buy-and-hold ETF investing, brokerage cost per transaction matters less than ongoing MER - choose a platform that supports your chosen ETFs.

Step 2: Choose your ETFs. A simple two-ETF portfolio - VAS (Australian shares, MER 0.07%) and VGS (global developed markets, MER 0.18%) in your target allocation - covers the major asset classes efficiently. Add VGE (emerging markets, MER 0.48%) and VAF or VBND (Australian or global bonds) to complete the allocation.

Step 3: Automate contributions. Set up a regular investment plan or calendar reminder to invest on payday. Dollar-cost averaging - investing a fixed amount at regular intervals regardless of market conditions - eliminates the need to time the market and reduces the average cost per unit over time.

Step 4: Reinvest distributions. Most brokers offer dividend reinvestment plans (DRP) - distributions from your ETFs are automatically reinvested to buy additional units. This compounds your investment without requiring manual action and eliminates cash drag.

Step 5: Review annually, not daily. A long-term share portfolio is not designed for frequent monitoring. Annual review of your target allocation, contribution rate, and performance against benchmark is sufficient - daily price checking undermines long-term investing discipline.

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Work through these steps to build a diversified, tax-efficient portfolio:

• Set your target asset allocation before selecting any investments - this is the most important decision
• Include both Australian and international shares - 100% ASX-listed shares is concentrated in banks and miners, not diversified
• Choose low-cost broad-market ETFs (VAS, VGS) as your core - MER below 0.20% for core index positions
• Understand franking credits: Australian share ETFs (VAS) pass through franked dividends that offset your personal income tax
• For smoothed franked income, consider established LICs (AFIC, Argo) as a satellite to your ETF core - but check NTA discount/premium before buying
• Open a low-cost brokerage account - compare flat-fee platforms (SelfWealth at $9.50) vs percentage-fee for your typical trade size
• Automate contributions on payday - dollar-cost averaging removes the temptation to time the market
• Rebalance using new contributions directed to lagging assets before selling appreciated positions - minimises CGT
• Hold assets for 12+ months before selling - the 50% CGT discount applies to assets held more than one year
• Review your portfolio annually, not daily - long-term returns are driven by asset allocation and contribution rate, not trading frequency

A simple two-ETF portfolio (VAS + VGS) held consistently over 20 years, with automatic contributions and reinvested dividends, will outperform the majority of actively managed approaches at a fraction of the cost.