How to Rebalance Your ETF Portfolio
Last updated: March 2026
Keep your portfolio aligned with your goals by rebalancing regularly. Learn when to rebalance, which methods work best, and how to do it without triggering unnecessary taxes.
Step 1: Know Why Your Portfolio Drifts
When you set a target allocation like seventy percent stocks and thirty percent bonds, market movements cause those percentages to shift over time. If stocks rise twenty percent while bonds return five percent, your seventy-thirty split might drift to seventy-five-twenty-five. This means you are now taking on more risk than you originally intended. Conversely, after a stock market crash your allocation might shift to sixty-forty, meaning you are too conservative for your goals. Rebalancing is the process of bringing your portfolio back to its target percentages. Without it, your portfolio slowly transforms into something that no longer matches your risk tolerance or investment plan.
Step 2: Pick a Rebalancing Schedule
There are two common approaches. Calendar rebalancing means you check and adjust your portfolio on a fixed schedule, typically annually, semi-annually, or quarterly. Annual rebalancing works well for most people because it is simple and infrequent enough to minimize costs. Threshold rebalancing means you only act when an asset class drifts more than a set amount from its target, usually five percentage points. For example, if your stock target is seventy percent, you rebalance when it crosses above seventy-five or drops below sixty-five. Research shows both approaches produce similar results over time. Choose the one you will actually follow consistently.
Step 3: Calculate Your Current Versus Target Allocation
Log into every investment account you have, including brokerage, IRA, 401k, and any others. Note the current value of each holding and calculate its percentage of your total portfolio. Compare each asset class percentage to your target. For example, if your target is sixty percent US stocks, twenty percent international stocks, and twenty percent bonds, and your current allocation is sixty-five percent US, eighteen percent international, and seventeen percent bonds, you know US stocks are five points overweight while international and bonds are each underweight. This gap tells you exactly what needs to change.
Step 4: Rebalance with New Contributions First
The easiest and most tax-efficient way to rebalance is to direct your next contributions entirely toward underweight asset classes. In the example above, you would put all new monthly investments into international stock ETFs and bond ETFs until those categories reach their targets. This avoids selling anything, which means no capital gains taxes in taxable accounts. For most investors who contribute regularly, this approach handles minor drift without any selling. Only if the drift is large, say ten percentage points or more, and contributions alone cannot correct it in a reasonable time should you consider selling overweight positions.
Step 5: Sell and Buy When Contributions Are Not Enough
If your allocation has drifted too far for contributions to fix, you need to sell overweight positions and buy underweight ones. Start in tax-advantaged accounts like your IRA or 401k where selling has no tax consequences. If you must sell in a taxable account, look for positions with losses you can harvest for a tax benefit. For positions at a gain, sell shares held longer than one year to qualify for lower long-term capital gains rates. Use specific lot identification at your broker to choose the most tax-efficient shares. Execute all the trades on the same day to avoid market movement changing your calculations between the sell and buy transactions.
Step 6: Automate and Set Reminders
After your initial rebalance, set systems in place so you do not forget in the future. If you use calendar rebalancing, set a recurring annual reminder on a date you will remember, such as January first or your birthday. Some brokers and robo-advisors offer automatic rebalancing features that handle the entire process for you. If your broker offers automatic rebalancing, consider enabling it. Whether manual or automatic, the key is consistency. Rebalancing once per year is enough. Do not over-monitor your allocation between rebalancing dates because it leads to unnecessary anxiety and premature action.
Pro Tips
- ✓Rebalance in tax-advantaged accounts first to avoid triggering taxable events from selling overweight positions.
- ✓Use new contributions to correct minor drift before selling any holdings in taxable accounts.
- ✓Once per year is sufficient for rebalancing. More frequent rebalancing adds costs without improving long-term results.
- ✓Do not skip rebalancing during market downturns. Buying underweight assets when they are cheap is exactly how rebalancing adds value over time.
Common Mistakes to Avoid
- ✗Ignoring rebalancing entirely and letting a multi-year bull market shift your portfolio to a much riskier allocation than you intended.
- ✗Rebalancing too frequently, such as monthly or weekly, which creates unnecessary transaction costs and taxable events.
- ✗Only considering individual accounts instead of your total portfolio across all accounts when calculating allocation drift.
- ✗Selling winning positions in a taxable account to rebalance without considering the capital gains tax impact.
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