Portfolio rebalancing restores an investment mix to its intended allocation after market movements have caused it to drift. Left alone, a portfolio built for a balanced risk profile can become dominated by a single asset class and carry more risk than its owner intended.
Markets rarely move in a way that keeps a portfolio aligned with its original strategy. As some assets outperform and others lag, asset allocation shifts, the risk profile changes, and the portfolio moves away from its stated objective. Rebalancing brings those allocations back into line.
Rebalancing involves reviewing your current asset mix, comparing it with your intended allocation, and adjusting where required. This guide covers how often to rebalance, what signals a review, and what to weigh before making changes.
What Is Portfolio Rebalancing?
Investment portfolio rebalancing restores a portfolio to its intended asset allocation after market movements have caused it to drift. If your strategy targets 60% equities and 40% bonds, and a strong equity run pushes that to 70/30, rebalancing means selling equities and buying bonds until the portfolio returns to target.
How Asset Allocation Can Drift Over Time
Take a portfolio that starts at 50% growth assets, such as shares, and 50% defensive assets, such as bonds.
If shares outperform bonds over several years, their share of the portfolio grows. Without rebalancing, the original 50/50 split could become:
- 65% growth and 35% defensive, on Australian equity returns
- 75% growth and 25% defensive, on global equity returns
The portfolio now carries more investment risk than intended.
Someone who set up a balanced portfolio at age 50 and left it untouched until age 60 could retire with materially more equity exposure than planned. Where preserving capital has become the priority, that exposure no longer matches the objective.
Rebalancing does not attempt to predict which asset will perform best. It checks that the portfolio still reflects the intended level of risk and current financial goals, rather than letting past winners set the allocation.
Why Does Rebalancing Matter?
Risk Control
Rebalancing keeps investment risk aligned with the intended asset allocation. When one asset class outperforms for a sustained period, it grows to a larger share of the portfolio than planned. Rebalancing returns those weightings to target and limits the portfolio’s exposure to a single market.
Investment Discipline
Rebalancing sets a process for investment decisions rather than leaving them to market conditions. It reduces the tendency to buy assets that have recently performed well and to sell during periods of weakness. A defined approach produces consistent behaviour when conditions are not.
Alignment With Financial Goals
Investment needs change as circumstances change. Someone approaching retirement typically places more weight on capital preservation and reliable income. Reviewing and rebalancing keeps the asset allocation matched to the current time horizon, risk tolerance, and objectives.
Maintaining Diversification
A diversified portfolio becomes less diversified when particular assets outperform for long enough. Rebalancing restores the intended mix across growth and defensive assets and limits dependence on a single asset class, market, or sector.
Encouraging Disciplined Buying and Selling
Rebalancing reduces positions that have grown beyond target and adds to those that have fallen below it. That does not guarantee better returns. It does provide a rule for managing allocations rather than letting recent performance set the portfolio’s composition.
When to Rebalance Your Investment Portfolio?
There is no universal rebalancing schedule. The right approach depends on your goals, risk tolerance, time frame, and how far the allocation has moved from target. Regular reviews identify when adjustment is warranted.
The Calendar Approach
Under the calendar approach, you review the portfolio at a set interval, typically once or twice a year. Review the overall investment plan at least annually. Growth investments such as shares warrant a review once or twice a year.
A review does not require a trade. Its purpose is to check whether the investments remain consistent with financial goals, risk tolerance, and time frame. Monitoring more often than that encourages unnecessary trading.
The Threshold Approach
The threshold approach measures how far the portfolio has moved from target. If your strategy targets 60% growth and 40% defensive assets, you set a tolerance band around those targets. When market movements push the allocation outside that band, you review whether to rebalance.
This approach accounts for assets moving at different rates. When shares rise while other assets fall, a portfolio that started balanced becomes weighted towards shares, and its volatility rises with it.
Combining Both Approaches
Many investors use both: review the portfolio on a set cycle, then rebalance only when the allocation has moved far enough from target to warrant it.
Rebalancing should serve the investment strategy rather than substitute for a market view. Before selling or switching, weigh the tax consequences and transaction costs. Selling investments to rebalance can create a tax liability.
SMSF trustees have a further obligation. The ATO requires trustees to regularly review the fund’s investment strategy with regard to risk, expected returns, diversification, liquidity and members’ circumstances. Review the strategy at least annually and whenever a significant event occurs, whether a market correction or a member starting or stopping a pension.
How to Rebalance Your Investment Portfolio?
Step 1: Review Your Current Allocation
Establish what you hold, how much of each, and what percentage of the total each asset class represents. Compare that to your target allocation to identify where the portfolio has drifted.
Step 2: Calculate What Needs to Change
Identify which asset classes sit above target and which sit below. Calculate the dollar value of each trade required to restore the target allocation.
Step 3: Consider Tax Implications
In a taxable account, selling appreciated assets to rebalance triggers a capital gains tax event. Two approaches reduce that cost: direct new contributions into underweight assets rather than selling overweight ones, and rebalance first within accounts where the tax consequence is lower, such as an SMSF in pension phase.
Step 4: Execute and Document
Execute the trades required to restore target weights. SMSF trustees should record the rebalancing decision, its rationale and its outcome in trustee minutes, which supports the documented investment strategy requirement.
Rivkin Private Wealth manages this process for clients on a systematic basis. Contact us to discuss how we work.
How Often Should You Rebalance Your Portfolio?
Frequency depends on monitoring approach, transaction costs, and tax. Annual rebalancing is adequate for most long-term investors and keeps the tax cost low. Quarterly rebalancing suits portfolios with large market movements or more complex structures.
The governing principle is that rebalancing follows a pre-determined rule, whether time-based or threshold-based. Market commentary does not set the trigger.
The Benefits of Portfolio Rebalancing
| Benefit | How It Manifests |
| Risk management | Prevents equity-heavy drift from pushing portfolio volatility beyond the intended level |
| Behavioural discipline | Reduces the tendency to chase performance or sell during downturns |
| Goal alignment | Keeps the portfolio matched to the actual investment horizon and income needs |
| Tax efficiency | Rebalancing can realise losses to offset gains, reducing the annual tax liability |
| Long-term performance | Limits concentration in assets that have run well beyond their target weight |
Frequently Asked Questions
Does Rebalancing Improve Investment Returns?
Not necessarily. Rebalancing manages risk and maintains the intended asset allocation. It can help returns by reducing exposure to assets that have become overweight and adding to those that have fallen, and it can also mean selling assets that continue to perform.
Is Rebalancing Worth the Transaction Costs?
It depends on the portfolio, the amount being traded, and the costs involved. Frequent or small adjustments may not be worthwhile if brokerage, spreads, taxes, or other costs outweigh the benefit. Using defined tolerance ranges can help investors avoid unnecessary transactions and focus on meaningful changes in asset allocation.
What Should Trigger an Immediate Portfolio Review?
A change in financial circumstances, investment goals, risk tolerance, or time horizon. Approaching retirement, receiving a large sum, a change in income needs, or a major life event all warrant a review ahead of the usual date.
How Does Rebalancing Work With New Contributions?
New contributions rebalance a portfolio without selling anything. Direct more of the new money towards asset classes below their target allocation. That reduces transaction costs and defers capital gains.
Can I Rebalance Within My Super Fund?
Yes, subject to the investment options and rules of your fund. Rebalancing inside super is not automatically tax-free. Treatment depends on the type of fund, the investments involved, and how the transaction is structured. In an SMSF, gains and losses are dealt with at the fund level rather than as personal capital gains.
Conclusion
Rebalancing is simple to describe and harder to apply consistently. Markets move, and a portfolio built to a plan drifts away from it. The timing question is answered by the strategy you set, not by a view on where markets go next.
The discipline applies equally to a complex SMSF, a diversified investment account and a straightforward balanced portfolio. What it controls is risk.
An investment portfolio review with Rivkin Private Wealth establishes whether your current allocation still matches your goals and risk profile. Contact our team to arrange one.
