Rebalancing Trade Size Calculator
Work out the dollar amount to buy or sell in one asset class to bring your portfolio back to its target allocation.
Your results
Calculation breakdown
- Target value
- total portfolio × target %
- Trade size
- target value − current value
Worked example
Your shares are worth $30,000 out of a $100,000 portfolio (30%), but your target is 40%. You would need to buy $10,000 more in shares to reach the target allocation.
Assumptions
- Does not account for capital gains tax that may be triggered by selling to rebalance.
- Assumes the rest of the portfolio makes up the balance to reach 100% overall.
- Consider directing new contributions to underweight assets before selling overweight ones.
How this calculator works
Enter your current holding value in an asset class, your total portfolio value and your target allocation percentage to see the dollar trade needed to rebalance. A positive figure means buying more of that asset, while a negative figure means trimming it back to the target weight.
Rates sourced from the Australian Taxation Office for the 2026–27 financial year. Last reviewed 01/07/2026.
Frequently asked questions
How often should I rebalance?
Common approaches are annually, or whenever an asset class drifts more than a set percentage (for example 5%) from its target.
Does this account for capital gains tax on selling?
No, selling to rebalance in a taxable account may trigger CGT; consider directing new contributions to underweight assets first to avoid this.
What if I have more than two asset classes?
Run the calculator once per asset class using its current value, the total portfolio value and its own target percentage.
Results are estimates only and are not financial, tax, legal or credit advice.
Rates and thresholds are configured for the 2026–27 Australian financial year and should be reviewed when government settings change.