What Is Portfolio Rebalancing?
Portfolio rebalancing is the process of periodically buying or selling assets in a portfolio to restore its original target asset allocation, which can drift over time as different investments grow or decline at different rates.
Why Portfolios Drift From Their Target
Because different asset classes grow at different rates, a portfolio’s actual allocation naturally shifts away from its original target over time. For example, if stocks significantly outperform bonds, the stock allocation can grow well beyond its intended target percentage, increasing overall portfolio risk.
Portfolio Drift in Action
Common Rebalancing Methods
The two most common rebalancing approaches are calendar-based rebalancing, which occurs at fixed intervals such as annually or quarterly, and threshold-based rebalancing, which triggers a rebalance whenever an asset class drifts beyond a predetermined percentage from its target.
Rebalancing Methods Compared
| Method | How It Works | Pros |
|---|---|---|
| Calendar-Based | Rebalance on a fixed schedule (e.g. annually) | Simple, predictable, low effort |
| Threshold-Based | Rebalance when drift exceeds a set percentage | Responds directly to market moves |
| Hybrid Approach | Combines both fixed schedule and drift triggers | Balances simplicity with responsiveness |
Tax and Cost Considerations
Rebalancing in taxable accounts can trigger capital gains taxes when selling appreciated assets, so many investors prioritize rebalancing within tax-advantaged accounts first, or use new contributions to buy underweighted assets rather than selling overweighted ones.
Frequently Asked Questions
How often should I rebalance my portfolio?
Many financial advisors suggest rebalancing once or twice a year, or whenever an asset class drifts more than 5 percentage points from its target allocation, though the ideal frequency can vary based on individual circumstances.
Does rebalancing guarantee better returns?
Rebalancing is primarily a risk management tool rather than a return-boosting strategy; it helps keep a portfolio aligned with an investor’s intended risk level rather than guaranteeing higher returns.
Can I avoid taxes when rebalancing?
Rebalancing within tax-advantaged accounts like IRAs or 401(k)s does not trigger capital gains taxes, making these accounts a preferred place to rebalance compared to taxable brokerage accounts.
What is a simple way to rebalance without selling assets?
Directing new contributions toward underweighted asset classes is a common way to gradually rebalance a portfolio over time without needing to sell existing appreciated holdings.
Key Takeaways
Portfolio rebalancing restores a portfolio to its target asset allocation after market movements cause it to drift, helping manage risk rather than maximize returns. Common approaches include calendar-based and threshold-based rebalancing, and tax considerations should factor into how and where rebalancing is done. This article is for informational purposes only and does not constitute investment advice.
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