Portfolio Rebalancing in Australia: When and How Often Is It Worth Doing?

Portfolio rebalancing is the process of returning your investment mix to its original target allocation after market movements have shifted the proportions. A portfolio that started as 60% Australian shares (ASX ETFs) and 40% bonds might drift to 70/30 after a strong equity rally. Rebalancing sells the outperformers and buys the laggards to restore the intended balance. The question facing Australian investors is not whether to rebalance, but when and how often the costs and tax implications justify the action.

This article provides general information only and does not constitute personal financial advice. It has been prepared without taking into account your objectives, financial situation or needs. Before acting on any information in this article, you should consider whether it is appropriate for you and seek advice from a licensed financial adviser if necessary.

Rebalancing Approaches Compared

Approach	Frequency	Trigger	Best For	CGT Impact	Brokerage Costs
Annual rebalancing	Once per year	Calendar date	Hands-off investors, small portfolios	Lower (one event per year)	Lower ($20-30/year)
Quarterly rebalancing	Four times per year	Calendar quarter	Active investors, volatile markets	Moderate (four events)	Moderate ($80-120/year)
Threshold-based (5-10%)	As needed	Allocation drifts beyond threshold	Tax-conscious investors, larger portfolios	Variable (may be zero some years)	Variable (pay only when triggered)
Buy and hold (never)	Never	None	Very long-term investors, simple portfolios	None	None

Annual Rebalancing

Annual rebalancing reviews your portfolio once per year, typically at financial year end (30 June for Australian investors). You compare current allocations against your target and make adjustments if the drift exceeds a minimum threshold (often 5%).

Pros:

• Simple calendar reminder, easy to remember and execute
• Minimal trading costs (one round of brokerage per year, typically $10-20 per trade on ASX brokers)
• Captures tax-loss harvesting opportunities before year end
• Aligns with annual tax planning and super contribution reviews
• Sufficient for most passive investors holding diversified ASX ETFs or LICs

Cons:

• Ignores significant mid-year market moves (a portfolio can drift substantially between July and June)
• May rebalance when unnecessary (if drift is minimal, you pay brokerage and trigger CGT for little benefit)
• Emotionally challenging if the rebalance date falls during extreme market volatility

Annual rebalancing suits Australian investors with portfolios under $100,000, holding 3 to 5 broad ASX ETFs or LICs, who prefer a hands-off approach. The cost of one annual rebalance (typically $30 to $60 in brokerage across a few positions) is manageable and the CGT implications are straightforward.

Quarterly Rebalancing

Quarterly rebalancing checks allocations every three months (end of March, June, September, December). Each quarter, you assess drift and trade if allocations have moved beyond your threshold.

Pros:

• Catches larger market swings more quickly than annual reviews
• Offers four opportunities per year to harvest tax losses
• Spreads rebalancing activity across the year, reducing the risk of poor timing
• Works well during volatile market periods when asset classes diverge rapidly

Cons:

• Higher brokerage costs (potentially $120 to $240 per year if you rebalance every quarter)
• More frequent CGT events, increasing tax complexity and reducing the benefit of the 50% CGT discount for long-term holdings
• Risk of overtrading in stable markets (paying costs to rebalance trivial drift)
• Requires more active monitoring and discipline

Quarterly rebalancing fits investors with portfolios over $200,000, holding multiple asset classes (Australian shares, international shares, bonds, A-REITs), who are comfortable with more active management and can absorb higher brokerage. It is particularly relevant during periods of high market volatility when annual rebalancing may miss significant opportunities.

Threshold-Based Rebalancing (5-10% Drift)

Threshold-based rebalancing ignores the calendar and acts only when an asset class drifts beyond a preset limit (commonly 5% or 10% from target allocation). A 60/40 portfolio with a 5% threshold would rebalance if Australian shares reached 65% or dropped to 55%.

Pros:

• Trades only when necessary, minimising brokerage and CGT events
• Responds to actual market conditions rather than arbitrary dates
• Can go years without rebalancing in stable markets, preserving the CGT discount
• Focuses effort on meaningful drift rather than trivial fluctuations
• Aligns with the principle that rebalancing is risk management, not return chasing

Cons:

• Requires regular monitoring (monthly checks to track drift)
• Threshold choice is subjective (5% is aggressive, 10% is conservative, no universal right answer)
• May trigger multiple rebalances in volatile years, eroding tax efficiency
• Behavioural challenge during extreme markets (hardest to rebalance when drift is largest and emotions are high)

Read also: How to Invest in ASX ETFs in Australia: A Beginner’s Guide to Platforms and Strategies

As covered in Principles of Finance, threshold-based strategies balance the benefits of rebalancing (risk control, enforced buy-low-sell-high discipline) against the costs (brokerage, tax drag, behavioural friction). Australian investors with larger portfolios ($500,000 or more) and a focus on tax efficiency often prefer this method, accepting the monitoring burden in exchange for fewer taxable events.

According to the ATO, capital gains tax applies to the sale of assets held for more than 12 months at a 50% discount (ATO, 2026). Threshold-based rebalancing preserves this discount by avoiding unnecessary sales. A 10% threshold combined with annual review windows (only rebalancing within the last month of the financial year if a threshold is breached) can optimise tax outcomes.

Buy and Hold (Never Rebalance)

The buy-and-hold approach sets an initial allocation and never rebalances. The portfolio drifts naturally as markets move, with outperforming assets growing to dominate the mix.

Pros:

• Zero brokerage costs for rebalancing
• Zero CGT triggered by rebalancing (CGT only applies when you eventually sell for retirement or other needs)
• Maximum simplicity, no ongoing decisions
• Captures full upside of winning positions (a portfolio that drifted toward Australian shares over the past decade captured the ASX 200’s strong performance)

Cons:

• Risk concentration increases over time (a portfolio can become 80% or 90% in one asset class after a prolonged rally)
• Abandons the discipline of selling high and buying low (rebalancing enforces contrarian behaviour)
• May drift far from your risk tolerance (a conservative 60/40 portfolio becoming an aggressive 85/15 portfolio without any deliberate choice)
• Harder to reverse course once drift is extreme (selling a heavily concentrated position triggers a large CGT event)

Buy and hold without rebalancing suits investors with very simple portfolios (a single diversified ASX 200 or ASX 300 ETF), very long time horizons (20 to 30 years to retirement), and high risk tolerance. It also works for investors using regular contributions (dollar-cost averaging) to rebalance passively by directing new money to underweight positions rather than selling winners.

ASIC MoneySmart guidance emphasises that a diversified portfolio spreads risk across asset classes, and rebalancing maintains that diversification (MoneySmart, 2026). Abandoning rebalancing abandons that risk control.

Recommendation by Investor Profile

New investors, portfolios under $50,000: Annual rebalancing or passive rebalancing through new contributions. Brokerage costs and CGT complexity are minimal, and annual discipline builds good habits.

Intermediate investors, portfolios $50,000 to $200,000: Annual rebalancing with a 5% minimum drift threshold (only rebalance if at least one position has drifted 5% or more). This avoids unnecessary trades while capturing meaningful corrections.

Experienced investors, portfolios over $200,000: Threshold-based rebalancing (5% to 10% drift) with quarterly monitoring. Tax efficiency becomes material at this scale, and threshold triggers preserve the CGT discount.

Retired investors drawing income: Threshold-based or opportunistic rebalancing, using required withdrawals to rebalance passively (sell from overweight positions to fund living expenses, avoiding the need for separate rebalancing trades).

Conclusion

The right rebalancing frequency balances the benefits (risk control, buy-low-sell-high discipline) against the costs (brokerage, CGT, time). For most Australian investors, annual rebalancing or threshold-based rebalancing with a 5% to 10% drift limit offers the best trade-off. Quarterly rebalancing suits larger, more complex portfolios during volatile periods, while buy-and-hold without rebalancing is viable only for very simple, long-horizon strategies. Rebalancing is not about timing the market; it is about maintaining your intended risk level and enforcing disciplined behaviour. Choose the approach that fits your portfolio size, tax situation, and tolerance for active management, and stick with it consistently (as of August 2026; verify current brokerage costs and CGT rates at ato.gov.au before making changes).