Portfolio rebalancing is the process of adjusting your investment mix back to your chosen targets after market movements have caused it to drift. While the concept sounds simple, the timing of when you rebalance your portfolio can materially affect your long-term investment outcomes, transaction costs, and tax position.
Many Australian investors either rebalance ad-hoc after big market moves or once a year around tax time. A more deliberate approach typically works better. Consider an investor who held a 60% shares / 40% bonds allocation in early 2020. After the post-COVID rally where the ASX 200 rose over 25% and global shares surged even more, that portfolio could easily have drifted to 80% shares / 20% bonds by late 2021—exposing them to significantly more risk than they originally planned for.
Getting the right mix of shares and cash is one of the most important decisions you’ll make as an investor. This sits within a broader framework — you can explore how investment strategies are structured in practice.
Why timing matters:
Unchecked drift increases your portfolio’s volatility beyond your risk tolerance
Too-frequent rebalancing creates unnecessary transaction costs and tax events
A rules-based schedule removes emotional decision-making from the process
Quick Answer: How Often Should You Rebalance in Practice?
Most investors should review their investment portfolio at least annually and consider rebalancing when allocations drift 5–10 percentage points from their target allocation.
Here are three common schedules Australian investors use:
Annual: Review every July around EOFY for tax planning alignment
Semi-annual: Check in January and July when setting goals
Quarterly: March, June, September, December for closer oversight
Threshold based rebalancing adds another layer: rebalance whenever your current allocation moves beyond set bands—for example, if a 60/40 portfolio drifts past 70/30 or 50/50.
Approach | How It Works | Best For |
|---|---|---|
Time-based | Review at set intervals (annually, quarterly) | Investors wanting simplicity |
Threshold-based | Rebalance when drift exceeds 5-10% | Cost-conscious investors |
Hybrid | Annual review plus threshold triggers | Most investors |
Younger, growth oriented investor profiles may accept wider drift and less frequent rebalancing. Pre-retirees and retirees typically need tighter bands. These are general guidelines—speak with a financial adviser for tailored investment advice.
What Is Portfolio Rebalancing (and What It Isn’t)?
Portfolio rebalancing is the deliberate process of buying and selling investments to bring your asset mix back to a chosen target – particularly when building a structured investment portfolio aligned with your goals. It applies across different asset classes: Australian shares, global shares, fixed income, cash, and property.
Example: An Australian investor with a target asset allocation of 60% shares / 40% bonds sees their portfolio drift to 75% shares / 25% bonds after a strong equity run. Rebalancing means selling shares and buying bonds to restore the desired asset allocation.
Rebalancing is fundamentally about risk management—staying aligned to your investment strategy rather than predicting market highs or attempting market timing. It sits between “set and forget” investing (allowing unlimited drift) and hyperactive trading (constant adjustments). The goal is disciplined, periodic making adjustments.
Why Rebalancing Matters for Your Long-Term Goals
Different asset classes grow at different speeds. Shares historically deliver higher returns than bonds but with greater volatility. Left alone, your asset allocation will shift—often toward riskier assets as they compound faster.
This creates risk drift. A portfolio appropriate at age 35 can become dangerously aggressive at age 50 if equities keep outperforming and are never trimmed. Your time horizon shortens, but your risk exposure increases. This highlights the importance of aligning your allocation over time — especially when considering what asset allocation is appropriate at different ages.
Key benefits of regular rebalancing:
Keeps overall risk aligned with your risk tolerance and investment goals
Reduces overexposure to a single asset class, sector, or region
Enforces the buy low, sell high discipline—even when emotions push otherwise
Supports financial goals like retirement funding, a home deposit, or education savings
Research comparing investors over 15-year periods shows annually rebalanced portfolios experience 20-30% less volatility and smaller maximum drawdowns than unrebalanced portfolios.
Key Times to Consider Rebalancing Your Portfolio
There’s no single “perfect” time to rebalance. However, several common triggers work for most investors:
Scheduled reviews (annual or semi-annual)
Significant market movements or market volatility. Maintaining discipline during these periods is critical — particularly when considering how to stay invested during market volatility.
Major life events or changed investment objectives
1. Scheduled Reviews: Annual or Semi-Annual Check-Ups
Time-based rebalancing means choosing specific dates to compare your current allocation versus target mix. Many Australians review portfolios:
At financial year-end (around 30 June) for tax planning
Around New Year when setting goals
Quarterly for closer oversight
Pros: Simple, predictable, removes emotional decision-making, easy to automate with regular reminders.
Cons: May prompt trades when allocations haven’t moved far; can miss large drifts occurring between reviews.
Sarah reviews every January and July, rebalancing only if her allocation is off by more than 5 points. This hybrid approach keeps costs down while maintaining discipline.
2. After Significant Market Moves or Volatility
Strong bull markets or sharp corrections can quickly pull a portfolio away from its target mix. During the 2020-2021 post-COVID rebound, global shares surged—often pushing growth allocations well above target. Conversely, the early 2020 sell-off saw equity weights fall sharply.
Example drift triggers:
Equity allocation moving from 60% target to 68-70%
Bonds falling from 40% to under 30%
Any major asset class drifting more than 5 percentage points
The key is following pre-set rules rather than reacting to headlines. Volatile markets create opportunities for disciplined investors rebalance systematically.
3. After Major Life Events or Changes to Your Goals
Certain life circumstances should prompt a portfolio review:
Starting or losing a job
Receiving a large inheritance or bonus
Buying a home or taking on a large mortgage
Marriage, divorce, or starting a family
Approaching retirement (within 5-10 years)
Transitioning from accumulation to drawing income
These events can change your time horizon, risk capacity, and cash flow needs. For example, moving from an 80/20 to 60/40 allocation when 10 years from retirement, followed by rebalancing to reach that new target.
4. When Diversification Has Slipped or Concentration Has Crept In
Some holdings can grow to dominate a portfolio over time—a single company share, a favourite sector, or an outperforming thematic ETF.
Example: An investor whose initial 5% allocation to a single ASX company grows to 20% after several years of strong performance now faces significant company-specific risk.
Warning signs your portfolio may need rebalancing:
Any single stock exceeds 10-15% of total portfolio value
One sector dominates your equity allocation
Heavy country bias (e.g., over 50% in Australian shares alone)
Rebalancing here means selling assets that have become overweight and spreading proceeds across other funds and regions.
How to Rebalance: Practical Steps and Methods
Several practical methods exist for rebalancing:
Selling overweight assets directly
Directing new contributions to underweight areas
Redirecting dividends and distributions
Adjusting within superannuation
Step-by-Step Rebalancing Workflow
Confirm your target allocation (e.g., 70% growth / 30% defensive)
Calculate current allocation using account statements or platform tools
Identify overweight and underweight asset classes versus target
Apply your rebalancing rule (time-based, threshold, or hybrid)
Plan specific trades with approximate dollar amounts
Execute trades mindful of brokerage and spreads
Document actions to maintain consistency
Worked example: A $100,000 portfolio with 60/40 target has drifted to $70,000 equities / $30,000 bonds (70/30). To rebalance: sell $10,000 of equities, buy bonds to restore 60/40.
Using New Contributions and Income to Rebalance More Tax-Efficiently
You can reduce selling investments (and triggering capital gains) by directing regular contributions into underweight asset classes or redirecting dividends away from overweight holdings.
Example: If global shares are underweight but Australian shares are overweight, direct new contributions into a global shares ETF until the right mix normalises.
This approach works well for investors still accumulating money or making regular super contributions. The trade-off: it’s slower than selling, so it may not fully correct large drifts quickly.
Choosing Thresholds and Rebalancing Bands
Rebalancing bands define tolerance ranges around your target allocation:
For a 60% shares target: rebalance if shares fall below 55% or rise above 65%
For a 20% international shares target: rebalance if it moves outside 15-25%
Wider bands (±10%) mean fewer trades and lower transaction costs but allow more risk drift. Narrower bands mean tighter control but more frequent rebalancing activity.
Costs, Tax and Other Trade-Offs When Rebalancing
Every rebalancing trade carries potential costs:
Transaction costs and spreads
Capital gains tax on realised profits
Time and effort
Behavioural difficulty of trimming winners
Transaction Costs and Portfolio Size
Common trading costs include brokerage ($10-20 per trade), ETF buy-sell spreads, and platform fees. For smaller portfolios, these costs can be material.
Smaller portfolios: Less frequent rebalancing, use new contributions, avoid micro-trades eaten by fees.
Larger portfolios: Percentage-based costs are lower; more precise rebalancing is feasible.
Tax Implications (Especially Capital Gains Tax)
Selling investments outside super can crystallise capital gains. Key Australian considerations:
50% CGT discount for assets held more than 12 months
Impact of large gains realised shortly before 30 June
Potential to harvest capital losses to offset gains. These considerations form part of a broader framework when understanding how capital gains tax applies to investment decisions in Australia.
Tax-aware strategies:
Rebalance within super where tax rates are lower
Use new contributions to avoid selling
Spread large position trimming over multiple tax years
This is general information only, not tax advice. Consult a registered tax agent or financial professional.
Behavioural Challenges: Selling Winners and Buying Laggards
Psychologically, it’s difficult to trim investments that have done well. Rebalancing forces you to sell high and buy low—counter to short-term emotions.
Strategies to manage this:
Pre-define rules in a written investment plan
Use automated alerts when allocations drift
Rebalance only at set intervals to reduce second-guessing
How Money Path Can Help You Rebalance More Effectively
Money Path offers a structured, technology-supported approach to portfolio management and rebalancing—focused on education and planning rather than speculation.
How Money Path supports rebalancing:
Portfolio tracking dashboards showing current vs target allocations in real time
Customisable alerts when asset classes drift beyond chosen thresholds
Scenario tools modelling how different rebalancing frequencies affect outcomes
Educational resources helping align allocation with your risk tolerance and investment objectives
Money Path’s rules-based approach reduces emotional investment decisions while keeping costs and tax implications visible. Explore Money Path’s platform to set up your personal rebalancing framework.
Frequently Asked Questions About When to Rebalance
How often should I rebalance my portfolio? Most investors benefit from annual reviews combined with 5-10% drift thresholds. More frequent rebalancing rarely improves outcomes and increases costs.
Is it bad to rebalance too often? Yes. Quarterly or monthly rebalancing typically adds transaction costs without meaningful risk or return improvements versus annual approaches.
Should I rebalance during a market crash? Stick to your pre-set rules. Rebalancing during downturns (buying equities when they’re down) has historically benefited long-term returns, though it’s emotionally challenging.
Do I need to rebalance my superannuation? Many super funds auto-rebalance internally, but you should still review your allocation periodically—especially as life circumstances change or retirement approaches.
Can I automate rebalancing? Yes. Many platforms offer alerts or automatic rebalancing features. Money Path’s tools can help set up rules-based frameworks.
What if my portfolio is small—is rebalancing still worth it? Yes, but use contributions to rebalance and set wider bands (±10%) to minimise transaction costs.
Putting It All Together: Building Your Personal Rebalancing Plan
The core lessons are straightforward: know your target allocation, choose a simple rules-based approach to timing, and be mindful of costs and behavioural biases.
Write a one-page rebalancing plan specifying:
Review frequency (e.g., every June)
Drift thresholds (e.g., ±5%)
Which accounts are in scope
How you’ll handle major windfalls or life events
Consistency matters more than perfection. A simple strategy followed beats a complex one abandoned.
Your rebalancing checklist:
[ ] Confirm your target asset allocation
[ ] Check current allocation for drift
[ ] Set calendar reminders for regular intervals reviews
[ ] Define threshold triggers (5% or 10%)
[ ] Document your approach
[ ] Explore Money Path’s tools to implement your plan
