Rebalance after a market decline only if your current asset mix has moved away from a target that still suits your goals, time horizon, finances, and risk tolerance. Rebalancing means returning toward that target—not predicting a rebound or automatically buying stocks because prices fell.
First decide whether your target allocation still fits
Your target allocation—the planned mix of stocks, bonds, and other asset categories—is meant to support a particular goal and level of risk. A decline can change the value of those holdings and move the portfolio away from that mix, but it does not by itself show that the target is wrong.
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Before making trades, consider whether your goals, time horizon, financial situation, or ability and willingness to tolerate losses have changed. If so, review the target itself. Avoid changing it solely in reaction to a market drop: that can turn a planned adjustment into market timing, which Fidelity says is difficult to do consistently. Fidelity’s guidance on investment mix during a downturn discusses keeping the plan aligned with personal circumstances.
Compare your current allocation with the target
Look at broad asset categories across the portfolio, rather than judging a single holding by its recent performance or dollar value. For each category, compare its current share of the portfolio with the percentage in your plan. A stock-market decline may leave stocks below target and bonds above it, but the actual result depends on what you own and how each category moved.
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The SEC explains that allocation drift can leave a portfolio misaligned with an investor’s goals and risk level. Its asset allocation and diversification guide describes why periodically checking the mix matters.
Choose how to move back toward target
If the target remains appropriate and the current mix has drifted, you can adjust by trading, directing new money, or combining those approaches. The U.S. Securities and Exchange Commission’s Beginners’ Guide to Asset Allocation, Diversification, and Rebalancing describes these methods.
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| Method | How it works | What to consider |
|---|---|---|
| Sell and buy | Sell categories above target and use the proceeds to buy categories below target. | May restore the mix directly, but selling can create transaction costs and, in a taxable account, realized gains or losses. |
| Direct new contributions | Put incoming contributions toward categories that are below target. | Can reduce the need to sell, though it may take time or additional contributions to close a large gap. |
| Combine trades and contributions | Use contributions to address part of the drift and trade for the remaining difference. | Balances the pace of adjustment against the costs and tax consequences of selling. |
The SEC guide says that “By cutting back on the current ‘winners’ and adding more of the current so-called ‘losers,’ rebalancing forces you to buy low and sell high.” This is an explanation of how rebalancing can work, not a guarantee that a declining asset will recover or produce a gain.
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A consistent rule can help prevent decisions driven by each day’s headlines. Three common approaches are:
- Calendar review: Check the allocation on a set schedule, such as annually. A review does not require a trade if the portfolio remains within your chosen limits.
- Threshold: Act when a category’s allocation moves a preset amount away from target. Fidelity gives a deviation of 5 percentage points as an example, not a universal recommendation.
- Hybrid: Review periodically and rebalance only when the drift crosses a preset threshold.
There is no universally correct schedule in the cited guidance. Choose a rule you can follow, and avoid frequent adjustments that add cost or encourage reactive trading. Fidelity’s rebalancing overview discusses schedules, thresholds, and related considerations.
Check account taxes and trading costs before selling
In a taxable account, a sale may realize a capital gain or loss; the tax result depends on the account, holding, and transaction. Transaction fees and other trading costs can also affect whether a trade is worthwhile. Consider whether directing contributions to underweight categories can bring the allocation closer to target with fewer sales. Do not assume rebalancing is tax-free.
Tax-loss harvesting is a separate strategy that may be relevant to some investors during a decline; it is not a required part of rebalancing and is not, by itself, a reason to make a trade. Fidelity discusses tax considerations in its downturn guidance. The cited sources do not determine eligibility or the tax result of an individual transaction. This article is general U.S.-oriented education, not personal tax or investment advice.
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Consider automation if you do not want to manage the process
Target-date funds and robo-advisers are options for investors who prefer not to monitor and rebalance a portfolio themselves. Their approaches, costs, and services vary; the sources cited here do not establish the current features or fees of any specific provider. Review the fund or service details before choosing one. Fidelity describes automated management options in its portfolio management overview.
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