KEY TAKEAWAYS
- Rebalancing is a maintenance decision: it brings portfolio weights back toward a written allocation policy.
- Use predetermined review dates or drift ranges rather than headlines as the trigger.
- New contributions, withdrawals, and tax-aware trades can sometimes rebalance with less turnover.
- Rebalancing controls portfolio structure; it does not guarantee higher returns or prevent losses.
Measure drift against the policy
Compare current asset weights with the target and allowed ranges. A change is easier to justify when the portfolio crossed a written threshold rather than when markets simply feel uncomfortable.
Use cash flows before creating unnecessary trades
Directing new contributions or withdrawals toward underweight or overweight assets can reduce the number of sales required to restore balance.
Include taxes, spreads, and account rules
In taxable accounts, the cost of realizing gains can matter. Trading costs, bid-ask spreads, settlement, and account restrictions also belong in the rebalance decision.
Record the reason and the result
Save the before-and-after allocation, the trigger, the trades, and any tax or implementation constraints. That record helps distinguish disciplined maintenance from reactive trading.