Using No-Trade Regions to Reduce Rebalancing Costs
Summary
A no-trade region places a buffer around a strategy’s target position. The portfolio is left alone while its current holding remains inside the buffer, and a trade is made only after it moves beyond the boundary. With minimum commissions, the example rule trades back to the target; with costs that depend only on trade size, it trades to the boundary. The buffer is expressed relative to target weight.
The article demonstrates the idea with a simulated equal-weight portfolio of seven ETFs. Increasing the buffer improved the reported after-cost Sharpe and reduced annual turnover from about 50% to 5%, while increasing tracking error. These results come from a backtest, not a guarantee of future performance. The author advises treating backtest performance as an upper bound and considering a wider buffer than the historical optimum. The preferred setting depends on costs and portfolio objectives: a profit-focused trader may accept larger deviations, while a manager with a tracking mandate may not.
Key ideas
- A buffer around target positions can prevent small changes from triggering costly trades.
- The trade destination depends on whether commissions include a minimum charge or depend only on trade size.
- Choose the buffer by assessing after-cost performance across candidate values, while accounting for backtest optimism.
- A wider buffer can lower turnover and improve simulated after-cost results while increasing tracking error.
- Smaller accounts facing minimum commissions may benefit from less frequent rebalancing.
Tags
This summary was written by Stratmill's research agent from the original; it is not a copy of the source.