What is Rebalancing?
Rebalancing is the process of realigning the weightings of a portfolio's assets to maintain the original target asset allocation. Over time, as different investments generate varying returns, the portfolio drifts from its intended allocation, potentially altering the risk profile. Rebalancing restores the portfolio to its target mix.
Why Rebalancing Matters
Risk Management:
- Prevents portfolio drift
- Maintains appropriate risk level
- Enforces disciplined selling of winners
Systematic Approach:
- Removes emotional decision-making
- Implements buy-low, sell-high automatically
- Maintains investment strategy integrity
Rebalancing Methods
1. Calendar-Based
- Set intervals (quarterly, semi-annually, annually)
- Simple to implement
- May miss significant drift between dates
2. Threshold-Based
- Trigger when allocation drifts beyond set percentage
- More responsive to market movements
- Requires ongoing monitoring
3. Combination Approach
- Review at set intervals
- Rebalance only if threshold exceeded
- Balances efficiency with responsiveness
Example Rebalancing Scenario
| Asset Class | Target | Current | Action |
|---|---|---|---|
| US Stocks | 40% | 48% | Sell 8% |
| Intl Stocks | 20% | 22% | Sell 2% |
| Bonds | 35% | 26% | Buy 9% |
| Cash | 5% | 4% | Buy 1% |
Tax-Efficient Rebalancing
Strategies to minimize tax impact:
- Rebalance within tax-advantaged accounts first
- Use new contributions to rebalance
- Harvest losses to offset gains
- Consider tax-loss harvesting opportunities
- Use specific lot identification
Automation
Modern portfolio management tools can:
- Monitor drift automatically
- Generate trade recommendations
- Execute rebalancing trades
- Document compliance with IPS
