Portfolio Rebalancing Frequency Calculator
Trade-off: rebalancing frequency vs drift cost.
Calculate drift cost from infrequent rebalancing against transaction cost of frequent rebalancing. Enter portfolio value to see annual trade-off.
What this tool does
Enter portfolio value, drift tolerance, rebalance cost. The tool shows annual trade-off.
Enter Values
Formula Used
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Disclaimer
Results are estimates for educational purposes only. They do not constitute financial advice. Consult a qualified professional before making financial decisions.
200,000 portfolio, 5% drift tolerance, 25 rebalance cost: annual — quarterly (4×) = 100 cost, monthly (12×) = 300 cost, annually (1×) = 25 cost. Academic research suggests annual or 5% threshold rebalancing optimal for most. Daily rebalancing wastes cost for marginal return improvement.
A worked example
Try the defaults: portfolio value of 200,000, rebalances per year of 4, cost per rebalance of 25. The tool returns 100.00. You can adjust any input and the result updates as you type — no submit button, no reload. That's the real power here: seeing how sensitive the output is to one or two assumptions.
What moves the number most
The result responds to Portfolio Value, Rebalances per Year, and Cost per Rebalance. The rate and the time horizon usually dominate — compounding means a small change in either reshapes the final figure more than a similar shift in contribution size. Test this by doubling one input at a time.
The formula behind this
Frequency × unit cost. Everything the calculator does is shown in the formula box below, so you can check the math against your own spreadsheet if you want.
Where this fits in planning
This is a "what-if" tool, not a forecast. Use it to test ideas before committing: what happens if the rate is 2% lower than hoped, what happens if you add five more years. The value is in the scenarios you run, not the single answer you get from the defaults.
What this doesn't capture
Steady-rate math ignores real-world volatility. Actual returns are lumpy; sequence-of-returns risk matters most in drawdown; fees and taxes drag on compound growth; and behaviour changes in drawdowns can reduce outcomes below the projection. Treat the number as one scenario, not a forecast.
Rebalancing frequency produces an annual cost figure based on the inputs provided.
Inputs
This example uses typical values for illustration. Adjust the inputs above to match a specific situation and see how the result changes.
Sources & Methodology
Methodology
Frequency × unit cost.
References
Frequently Asked Questions
Optimal frequency?
Threshold vs time-based?
Cost per rebalance?
Tax-efficient rebalance?
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