1. Basic Concepts of Rebalancing

  • Asset Allocation: Investors set the proportions of different asset classes (such as stocks, bonds, cash, etc.) based on their risk tolerance and return objectives.
  • Market Volatility: Market fluctuations can cause asset proportions to deviate from the target, for example, a rise in stocks might make their share in the portfolio too high.
  • Rebalancing: Adjusting the portfolio back to the target proportions by buying and selling assets.

2. Methods of Rebalancing

  • Time-based Rebalancing: Adjusting the portfolio at fixed time intervals (e.g., quarterly or annually).
  • Threshold Rebalancing: Adjusting when a specific asset class deviates from the target proportion by more than a certain threshold (e.g., 5%).

3. Advantages of Rebalancing

  • Risk Control: Prevents a single asset from becoming overly dominant, thereby reducing risk.
  • Discipline: Avoids emotional decision-making and maintains the stability of the investment strategy.
  • Return Optimization: May enhance long-term returns by buying low and selling high.

4. Disadvantages of Rebalancing

  • Transaction Costs: Frequent adjustments may increase trading fees.
  • Tax Implications: In taxable accounts, rebalancing may generate capital gains tax.
  • Market Trends: In a unidirectional market, rebalancing may reduce returns.

5. Implementation of Rebalancing

  • Determine Target Proportions: Setting asset allocation based on risk preference.
  • Monitor the Portfolio: Regularly checking asset proportions.
  • Execute Adjustments: Restoring target proportions by buying and selling assets.

Summary

Rebalancing is a tool that “exchanges short-term transaction costs for long-term risk control,” making it suitable for sideways or sector rotation markets, but potentially incurring opportunity costs in unidirectional trending markets. When executing, it is recommended to combine threshold rules (e.g., rebalancing after a 10% deviation) rather than operating mechanically by time. Furthermore, it is suggested to perform adjustments no more than twice a year.