Rebalancing Bands: A Smarter Way to Control Portfolio Risk Without Constantly Switching Unit Trust Funds
Imagine you build a unit trust portfolio with a deliberate structure:
60% growth assets.
40% defensive assets.
At the time, this allocation reflects your:
Risk tolerance
Investment horizon
Financial goals
Capacity to absorb market volatility
Then equity markets perform strongly for several years. You make no new investment decision. You do not buy another fund. You do not intentionally increase risk. Yet your portfolio gradually becomes:
75% growth assets
25% defensive assets
You still own the same funds. But you no longer own the same risk profile. This is known as portfolio drift. And it creates an important investment-management question:
How far should a portfolio be allowed to move away from its intended allocation before you take action?
One answer is rebalancing. A more refined method is to use rebalancing bands—predefined ranges around your target allocation that help distinguish normal market movement from meaningful portfolio drift.
What Is Portfolio Rebalancing?
Rebalancing means adjusting a portfolio back toward its intended asset allocation after market movements cause the weights of different investments to change. Suppose your target is:
60% equities
40% fixed income.
After strong equity markets, your actual portfolio becomes:
70% equities
30% fixed income
You now have more equity exposure than you originally intended.
A rebalance might involve:
Reducing some equity exposure
Adding to fixed income
Directing new contributions toward the underweight asset
Using withdrawals from the overweight asset
The method depends on:
Investment structure
Transaction costs
Financial goals
Tax considerations where applicable
Availability of new contributions
Why Portfolio Drift Matters
Some investors say:
“Why rebalance? If equities are doing well, just let them grow.”
That sounds reasonable until you remember why the original allocation existed. Your 60/40 portfolio was not a random number. It represented a risk decision. Suppose a 60/40 portfolio becomes: 80/20. If equities then fall sharply, your portfolio may suffer a much larger decline than the original strategy was designed to tolerate. Therefore:
Doing nothing is still an allocation decision.
By allowing drift to continue indefinitely, you are effectively accepting the new risk profile.
Example: How Drift Changes Risk
Suppose your portfolio is: RM500,000.
Original Allocation
Equities: RM300,000.
Fixed Income: RM200,000.
Target: 60/40.
Now suppose equities rise 50% while fixed income is unchanged.
Equity value becomes: RM450,000.
Fixed income: RM200,000.
Total portfolio: RM650,000.
New equity allocation: RM450,000 ÷ RM650,000 ≈ 69.2%.
You never made a deliberate decision to increase equities from 60% to almost 70%. The market made the decision for you.
What Happens If Equities Then Fall?
Suppose equities subsequently fall: 30%.
If You Had Rebalanced to 60/40
Equity exposure before decline: Approximately RM390,000.
30% decline: Loss ≈ RM117,000.
If You Allowed the 69% Allocation to Remain
Equity exposure: RM450,000.
30% decline: Loss = RM135,000.
The difference is: RM18,000.
This simplified example illustrates why allocation drift matters. Rebalancing does not prevent losses. It helps keep the amount of risk closer to the level you originally intended.
Calendar-Based Rebalancing
One of the simplest rebalancing methods is calendar-based.
For example:
Review every January.
or:
Review every six months.
The advantage is simplicity. You do not need to monitor markets continuously.
The Weakness of Calendar-Based Rebalancing
Suppose your target equity allocation is: 60%.
In March, a major market rally pushes equities to: 75%.
But your annual review is not until December. Your portfolio may remain substantially overweight equities for nine months. Alternatively, suppose December arrives and equities are: 61%. There may be little reason to make changes simply because the calendar says it is review day. This introduces the logic behind rebalancing bands.
What Are Rebalancing Bands?
Instead of saying:
“I rebalance every January.”
an investor establishes a tolerance range around each target allocation.
For example:
Target equity allocation: 60%.
Rebalancing band: 55% to 65%.
As long as equities remain within: 55%–65%, no allocation change is automatically triggered.
If equities move outside that band—for example:
67%
or:
53%
the investor reviews whether rebalancing is appropriate. This is a conceptual framework, not a universal recommendation.
Simple Rebalancing Band Example
Suppose your portfolio target is:
Asset Class | Target | Illustrative Band |
Equities | 60% | 55%–65% |
Fixed Income | 30% | 25%–35% |
Cash / Other | 10% | 7%–13% |
If equities rise to: 63%, no automatic action.
If equities reach: 68%, a review is triggered.
This creates a disciplined rule while allowing normal fluctuations.
Why Rebalancing Bands Can Be Smarter Than Constant Switching
Markets move every day. If you react every time an asset moves: 1%, you may create:
Excessive transactions
Unnecessary fees
Emotional decision-making
Administrative complexity
Rebalancing bands acknowledge that some movement is normal. They say:
“I will tolerate reasonable fluctuations, but beyond a defined threshold I will reassess the risk.”
This can help investors avoid over-managing their portfolios.
Why Rebalancing Can Feel Psychologically Uncomfortable
Suppose equities have risen dramatically. Financial media is optimistic. Everyone is discussing strong stock-market returns. Your portfolio is now overweight equities. Rebalancing may require you to:
Sell or trim the investment that is performing best.
That feels uncomfortable. Now imagine equities fall sharply. Everyone is pessimistic. Your equity allocation drops below target. Rebalancing may require you to:
Buy more of the asset everyone currently dislikes.
That can feel even harder.
Rebalancing Creates a Systematic Discipline
Conceptually, rebalancing can encourage:
Trim relatively high
and:
Add relatively low
This is not the same as perfectly buying bottoms and selling tops. And it does not guarantee better returns. Its primary purpose is:
Risk control and allocation discipline.
Any return benefit is secondary.
Rebalancing Is Not Market Timing
This distinction is extremely important.
Market Timing
“I think equities are about to crash, so I'm moving everything into cash.”
Rebalancing
“My strategic equity target is 60%, but market gains have pushed it to 70%, so I am restoring the portfolio toward my intended level.”
The first decision depends heavily on a forecast. The second follows a pre-established portfolio rule. That is why disciplined rebalancing is fundamentally different from making emotional short-term market calls.
Percentage Bands vs Absolute Bands
There are several ways bands can be structured.
Absolute Percentage Band
Example:
Target equities: 60%.
Allowed movement: ±5 percentage points.
Band: 55%–65%.
This is simple to understand.
Relative Bands
Another method uses a percentage of the target allocation.
For example:
Target: 60%.
Tolerance: 20% of target.
20% of 60 = 12 percentage points.
Illustrative range: 48%–72%.
This creates wider bands for larger allocations and narrower bands for smaller allocations. There is no universally correct approach. The principle matters more than the exact formula.
Narrow vs Wide Rebalancing Bands
A narrower band triggers more frequent rebalancing.
Example:
Target: 60%.
Band: 58%–62%.
This may require frequent intervention.
A wider band: 50%–70% would allow much more portfolio drift before action.
The appropriate band should balance:
Risk control
Portfolio volatility
Transaction costs
Practicality
Too narrow may create excessive activity.
Too wide may allow risk to change materially.
New Contributions Can Rebalance Without Selling
One of the most useful approaches for working investors is cash-flow rebalancing.
Suppose:
Target equity: 60%
Actual equity: 67%
You contribute: RM2,000 per month.
Instead of selling equities immediately, you may direct more of the new money toward:
Fixed income
Other underweight allocations
where appropriate.
Over time, this can move the portfolio closer to target without selling existing holdings.
Example: Rebalancing With New Contributions
Portfolio: RM100,000.
Current allocation:
Equity: 70% = RM70,000.
Fixed income: 30% = RM30,000.
Target: 60/40.
You invest another: RM10,000. If all RM10,000 goes into fixed income:
.
Fixed income: RM40,000.
New total: RM110,000.
Equity percentage: 63.6%.
You moved much closer to the 60% target without selling anything.
Why This Can Be Efficient
Using new contributions can potentially reduce:
Switching
Transaction costs
Administrative work
It can be particularly useful for investors making regular unit trust contributions.
However, whether this is practical depends on:
Contribution size
Size of drift
Fund structure
A large RM1 million portfolio cannot necessarily correct a severe allocation imbalance quickly using RM500 monthly contributions alone.
Withdrawals Can Rebalance Too
Retirees can potentially use a similar principle.
Suppose:
Target equity: 50%.
Actual equity after a strong rally: 58%.
The retiree needs to withdraw: RM20,000.
Instead of withdrawing proportionately from every fund, they may consider taking more from the overweight allocation. This can simultaneously:
Meet cash-flow needs
Reduce portfolio drift
Again, the appropriate implementation depends on the individual.
Rebalancing Is a Portfolio-Level Decision
Suppose your Asia fund has risen: 40%. You think:
“It made too much profit. I should sell.”
That is not necessarily rebalancing. First ask:
What is my total equity allocation?
What was my target Asia allocation?
Have other funds changed too?
Does the fund still fit the portfolio?
A fund's strong return by itself is not a reason to sell. Rebalancing is based on:
Portfolio weights relative to target
not:
Whether one fund has made a lot of money.
Geographic Rebalancing
Suppose your target equity portfolio is:
40% Malaysia
35% Global Developed Markets
25% Asia
After several years:
Malaysia: 28%
Global: 52%
Asia: 20%
Your overall equity percentage may still be correct. But geographic exposure has drifted significantly. Rebalancing can therefore occur at several levels:
Level 1
Growth vs defensive assets.
Level 2
Equities vs bonds.
Level 3
Countries or regions.
Level 4
Investment styles.
Level 5
Other portfolio exposures.
But Don't Overcomplicate Rebalancing
A portfolio with 15 separate rebalancing rules can become difficult to manage. For many investors, the most important allocations may be broader categories such as:
Growth assets
Defensive assets
Domestic
International
The more complicated the rule, the harder it may be to follow consistently. Good investment systems should be understandable enough to implement.
Transaction Costs Matter
Depending on the unit trust platform and fund, rebalancing could involve:
Switching fees
Sales charges
Bid-offer spreads
Platform costs
Other administrative costs
Tax consequences may also be relevant in certain investment structures or jurisdictions. Therefore, rebalancing every few weeks over tiny deviations may be inefficient. This is one reason bands can be useful.
Don't Forget Exit or Redemption Rules
Before implementing a rebalancing strategy, understand:
Redemption procedures
Switching rules
Minimum balances
Processing time
Applicable charges
A theoretically perfect rebalancing model can still be impractical if the chosen investment platform makes frequent adjustments costly.
Rebalancing and Unit Trust Sales Charges
Imagine you constantly switch between funds. Even where switching is available, excessive activity can create costs or operational consequences. If an investor repeatedly exits and repurchases funds with sales charges, this can materially reduce long-term returns. Rebalancing should therefore be deliberate, not reactive.
Rebalancing Does Not Fix a Bad Asset Allocation
This is one of the most important concepts. Suppose your portfolio target is:
90% high-risk equities.
10% cash.
but your actual:
Risk tolerance is moderate
Goal is only three years away
Rebalancing faithfully back to 90/10 does not solve the problem. It simply keeps restoring the portfolio to an inappropriate strategy. Before creating rebalancing rules, the target allocation itself must make sense.
Start With Goals
Asset allocation should begin with:
What is the money for?
When is it needed?
How much volatility can you tolerate?
How much loss can your financial situation withstand?
Only then should you decide:
Target allocation
Rebalancing rules
Risk Tolerance vs Risk Capacity
Again, these are different.
Risk Tolerance
How comfortable are you emotionally with market fluctuations?
Risk Capacity
How much financial loss can your plan actually tolerate?
A person may enjoy aggressive investing but need the money in three years. Their risk tolerance may be high. Their risk capacity may be low. A sensible target allocation should consider both.
Sometimes You Need Rebalancing
Suppose your target remains appropriate. Markets changed the weights. Then:
Rebalancing may be the correct action.
Sometimes You Need Redesign
Suppose you originally created a portfolio at age 35. Now you are 55 and approaching retirement. Your:
Goals
Time horizon
Income
Liabilities
Risk capacity
have changed.
Restoring the old age-35 target may no longer make sense. You may need to redesign the strategic allocation itself. This distinction matters:
Rebalancing restores the existing strategy.
Redesigning changes the strategy.
Example: Age 35 vs Age 55
At age 35: Target: 70% growth / 30% defensive.
At age 55: After reviewing retirement needs, the investor may decide a new target should be: 55% growth / 45% defensive.
That is not ordinary rebalancing. That is a strategic asset-allocation change. Once the new target is established, rebalancing rules can then be built around it.
Rebalancing Around Retirement Requires Extra Care
Retirement introduces:
Regular withdrawals
Reduced employment income
Sequence-of-returns risk
An investor who is about to retire may therefore need to consider:
Liquidity reserves
Withdrawal strategy
Appropriate equity exposure
rather than mechanically restoring an aggressive allocation after every market decline.
Rebalancing Bands and Sequence-of-Returns Risk
Consider a retiree withdrawing money while equities fall substantially. Blindly selling bonds to buy equities simply because a band was triggered could conflict with immediate spending needs. The rebalancing framework should therefore operate inside a broader retirement plan. Rules should support the financial goal—not replace judgment entirely.
Asset-Class Volatility Matters
Different asset classes move differently. A volatile equity allocation may cross narrow bands frequently. A short-duration fixed-income allocation may move much less. Therefore, using identical bands for every asset class may not always be sensible. The exact approach should reflect the characteristics of the portfolio.
Rebalancing Does Not Guarantee Higher Returns
This should be clear. Rebalancing may sometimes reduce returns during a prolonged trend.
Imagine equities rise strongly year after year. An investor who repeatedly trims equity exposure may earn less than someone who simply allowed equities to become 90% of the portfolio. But the second investor also ends up taking far more risk.
The primary purpose of rebalancing is:
Risk management, not return maximisation.
Rebalancing Can Feel Wrong During Bull Markets
During a strong equity bull market, disciplined rebalancing can look foolish. Friends may say:
“Why are you selling the best-performing asset?”
But the question is not whether equities are good investments. The question is:
“Do I still want 75% of my portfolio in equities when my planned target was 60%?”
That is an allocation question.
Rebalancing Can Feel Even Worse During Bear Markets
When markets collapse, rebalancing may require buying more equities. Emotionally, investors may want to do exactly the opposite. They may say:
“I'll wait until everything is safe again.”
But if a portfolio has a sound long-term target, systematic rebalancing can help reduce emotional decision-making. Again, this does not guarantee immediate gains. Markets may continue falling.
Rebalancing and Behavioural Finance
Rebalancing rules can help counter several behavioural biases.
Recency Bias
Assuming recent strong performance will continue indefinitely.
Performance Chasing
Adding repeatedly to whatever performed best.
Loss Aversion
Avoiding an asset merely because it recently fell.
Overconfidence
Believing you can consistently predict market turning points.
A predefined rebalancing rule replaces some emotional decisions with process.
Rebalancing Bands Can Also Become Too Mechanical
Rules are helpful. But blindly following a number without checking circumstances can also be problematic. Suppose an allocation crosses its band because:
A fund changed its mandate
Your financial goal changed
You require liquidity soon
Your risk capacity changed
In that case, the correct action may not simply be:
“Buy more because the band says so.”
The underlying circumstances deserve review.
Rebalancing Should Be Combined With Fund Review
Suppose your Asian equity allocation is below target. Before adding money automatically, ask:
Does the fund still fit its mandate?
Has the manager changed?
Has style drift occurred?
Is there major overlap with another fund?
Rebalancing should restore desired exposure, not blindly add to a product that may no longer be suitable.
Rebalancing Bands and Style Drift Are Connected
Imagine:
Target global equity: 30%.
Actual allocation: 30%.
So no rebalancing appears necessary.
But the global fund itself has changed from diversified global exposure to highly concentrated US growth exposure. The weight is correct. The underlying risk is not what you intended. Therefore, portfolio reviews should assess both:
Allocation weights
Underlying exposures
A More Complete Rebalancing Review
Ask three separate questions:
Question 1 — Weight
Is the allocation within its intended band?
Question 2 — Exposure
Does the fund still provide the exposure expected?
Question 3 — Target
Is the strategic target still appropriate for my life?
This is more robust than checking percentages alone.
Example of a Full Portfolio
Suppose:
Asset | Target | Band | Current |
Malaysian Equity | 20% | 15%–25% | 17% |
Global Equity | 40% | 35%–45% | 49% |
Fixed Income | 30% | 25%–35% | 26% |
Cash | 10% | 7%–13% | 8% |
The global equity allocation has exceeded its upper band. This triggers a review. Possible responses might include:
Redirect new contributions
Trim some global equity
Add to underweight areas
Use a combination
The correct implementation depends on the investor.
Threshold Rebalancing vs Calendar Rebalancing
Method | Trigger | Strength | Limitation |
Calendar | Specific date | Simple | May rebalance when unnecessary |
Threshold/Band | Allocation crosses a limit | More responsive to meaningful drift | Requires monitoring |
Hybrid | Periodic review plus bands | Balances discipline and practicality | Slightly more complex |
A hybrid method can be practical. For example:
Review portfolio every six months, but rebalance only if an allocation is outside its approved band.
This avoids both neglect and overtrading.
How Often Should Bands Be Checked?
Rebalancing bands do not require checking your account every day. For long-term investors, reviewing periodically can be sufficient. For example:
Quarterly
Semi-annually
Annually
depending on:
Portfolio size
Volatility
Complexity
The objective is not constant surveillance. It is controlled risk management.
Build a Written Rebalancing Policy
A simple written rule can reduce emotional decision-making. For example:
Target equity allocation: 60%. Review every six months. If equity allocation is between 55% and 65%, take no action. If outside the band, first use new contributions or withdrawals where practical before selling existing holdings.
This is merely an illustration. But documenting the rule before markets become emotional can make it easier to follow.
Why Written Rules Matter
Imagine equities fall 25%. Without a plan:
“Should I sell? Should I wait? Should I buy?”
With a plan:
“My equity allocation has fallen below the approved lower band. I will review the portfolio according to the rebalancing process.”
The second approach reduces improvisation during stressful markets.
Rebalancing and Large Lump-Sum Contributions
Suppose you receive:
Bonus
Business proceeds
Inheritance
and want to add RM100,000 to the portfolio. Before allocating it proportionally, look at current weights. The new money could potentially be used to correct existing imbalances.
This can make the portfolio more efficient without unnecessary selling.
Rebalancing and Dividend/Distribution Cash
Unit trust distributions or other portfolio income can also be used strategically. Instead of automatically reinvesting distributions into the same fund, investors may consider directing cash toward underweight allocations where appropriate. Again, implementation depends on the fund structure and investor objectives.
Avoid Rebalancing Based on Profit Alone
Suppose you bought Fund A at RM100,000. It is now worth RM150,000. You think:
“I should sell because I already made RM50,000.”
The fact that an investment has made money does not tell you whether it is overweight. If your target allocation still supports RM150,000 of exposure, selling because of profit alone may not make sense. Portfolio management should be based on:
Current weight relative to target
rather than:
Original purchase price.
Don't Anchor to What You Paid
This is known as anchoring. Investors become psychologically attached to:
Purchase price
Previous high
Previous low
But rebalancing decisions should focus on:
Current portfolio
Current target
Current financial goals
not the price you originally paid.
Rebalancing and Market Crashes
Suppose equities fall dramatically.
Target: 60%.
Actual allocation: 48%.
This is outside a 55% lower band.
A disciplined investor may review whether to add to equities. But before doing so, confirm:
Emergency fund is adequate
Financial goals have not changed
Money is still long-term
Risk capacity remains appropriate
Never invest money required for near-term obligations simply because a rebalancing rule was triggered.
Your Emergency Fund Is Not a Rebalancing Tool
This is important. Suppose your equity allocation falls below target. Do not automatically use:
Emergency savings
Money needed for next month's mortgage
Short-term education money
to rebalance.
Asset allocation rules apply to the investment portfolio, not money assigned to other financial jobs.
Keep Different Financial Buckets Separate
For example:
Emergency Fund
Liquidity and safety.
Short-Term Goal Money
For goals within a few years.
Long-Term Investment Portfolio
Growth and long-term objectives.
Rebalancing should occur within the appropriate investment bucket.
Common Rebalancing Mistakes Malaysian Investors Make
Mistake 1: Never Rebalancing
Strong performers can gradually dominate risk.
Mistake 2: Rebalancing Too Frequently
Tiny market movements do not necessarily justify action.
Mistake 3: Selling a Fund Just Because It Made Money
Profit is not the same as overweight.
Mistake 4: Treating Rebalancing as Market Timing
Strategic risk control and predictions are different.
Mistake 5: Ignoring Transaction Costs
Frequent switching can reduce returns.
Mistake 6: Rebalancing Back to an Inappropriate Target
The target itself must still be suitable.
Mistake 7: Ignoring Underlying Fund Changes
Correct weights do not guarantee correct exposures.
Mistake 8: Using Emergency Funds to Rebalance
Different money has different purposes.
A Simple Rebalancing Checklist
During each review, ask:
What is my target asset allocation?
What are my current allocations?
Which allocations are outside their bands?
Has my financial goal changed?
Has my time horizon changed?
Has my risk capacity changed?
Have any funds materially changed their exposure?
Can new contributions correct the imbalance?
Can withdrawals be taken from overweight assets?
What costs would selling or switching create?
Only then decide what action is appropriate.
Frequently Asked Questions
What is portfolio rebalancing?
Rebalancing means adjusting portfolio holdings toward an intended target allocation after market movements cause weights to drift.
What is a rebalancing band?
It is an acceptable range around a target allocation. A review is triggered when the portfolio moves beyond that range.
Should I rebalance every year?
Not necessarily. Calendar-based reviews are simple, but a band-based or hybrid approach may reduce unnecessary adjustments.
Does rebalancing improve returns?
Not necessarily. Its primary purpose is to maintain risk and allocation discipline.
Can I rebalance using new money?
Yes. Directing new contributions toward underweight allocations can be an efficient method where appropriate.
Should I sell a fund because it has made a large profit?
Not simply for that reason. First determine whether the exposure has exceeded its intended allocation.
What if my life circumstances change?
Then the target allocation itself may need redesigning rather than simply rebalancing.
The Bigger Lesson: Risk Changes Even When You Do Nothing
One of the most important portfolio-management lessons is:
A portfolio is not static.
Markets continuously change the weight of what you own. If:
Equities outperform
Bonds lag
One region rallies
One sector declines
your portfolio can gradually become very different from the strategy you originally designed.
This is why “buy and hold” should not necessarily be interpreted as:
“Buy and never review.”
Long-term investing can still involve disciplined portfolio maintenance.
Rebalancing Bands Add Structure
Rebalancing bands answer two useful questions:
Question 1
How much normal fluctuation am I willing to tolerate?
Question 2
At what point has the portfolio changed enough that action deserves consideration?
This helps separate: Noise from: Meaningful risk drift and can reduce unnecessary switching.
Conclusion
Portfolio management does not end when you choose your unit trust funds. Markets continuously change the weight of your investments.
A portfolio originally designed as: 60% growth / 40% defensive can quietly become: 75% growth / 25% defensive without you buying or selling anything.
At that point, the portfolio may no longer reflect the level of risk you originally intended. Rebalancing helps restore discipline. Rebalancing bands make the process more refined by allowing normal market fluctuations while creating predetermined thresholds for meaningful review.
The goal is not to constantly switch funds.
It is not to predict every market turning point.
It is not to maximise short-term returns.
The purpose is much simpler:
Keep your investment risk reasonably aligned with your long-term financial plan.
A disciplined investor therefore asks:
What was my intended allocation?
Where is my portfolio today?
Has the difference become meaningful?
Is the target still appropriate for my life?
These questions turn rebalancing from a trading exercise into a long-term risk-management process.
Disclaimer:
This article is for general educational purposes only and does not constitute investment, financial or tax advice or a recommendation to buy, sell or switch any unit trust. Rebalancing strategies, tolerance bands and target allocations should reflect an investor's objectives, risk tolerance, risk capacity, investment horizon, liquidity requirements, transaction costs and product structure. Unit trust prices can rise or fall. Investors should review relevant product documents and obtain appropriate professional advice before making investment decisions.
Contact Y1Planning for a Unit Trust Portfolio Review
Has strong market performance quietly changed your portfolio risk?
Y1Planning can help you review:
Current asset allocation
Portfolio drift
Growth vs defensive exposure
Geographic allocation
Fund overlap
Rebalancing considerations
Rebalancing bands
Risk tolerance and risk capacity
Investment horizon
Alignment with long-term financial goals
Don't switch funds simply because markets moved. First understand whether your portfolio's risk has moved away from what you intended.
Contact YY LIM 012-2311 228 for a professional Unit Trust Portfolio Review.
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