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A market correction is a reason to check your portfolio, not an automatic signal to trade. Compare your current asset mix with the target allocation you chose for your goals, time horizon and risk tolerance. If an asset class has moved beyond the drift limit in your plan, restore some or all of the target allocation using contributions, cash flows or carefully selected sales. Before changing the target itself, confirm that your goals, finances or ability and willingness to take risk have changed; market performance alone does not prove that the plan is wrong.
This approach separates rebalancing—returning to a chosen mix—from market timing, which means changing exposure because you are trying to predict the next move.
What rebalancing does after a correction
Rebalancing restores the relative weights of major asset categories such as stocks and bonds. A correction can push one category well above or below the percentage in your investment plan. Restoring the mix brings the portfolio’s risk closer to the level you accepted when you set the plan.
For example, a portfolio that began at 60% stocks and 40% bonds could become 80% stocks and 20% bonds after stocks outperform. The U.S. Securities and Exchange Commission uses this as a hypothetical illustration: the investor may sell part of the stock position and buy bonds to return toward the intended allocation. The example is not a recommended allocation or a prediction about future returns.
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Rebalancing does not require you to forecast whether prices will rise or fall next. It is a rules-based response to a difference between your current holdings and a preselected target.
First ask whether the plan still fits
Start with the allocation you already selected and the reason for selecting it. Write down the target percentage for each major asset category and the account or accounts in which it is held. Then check whether the facts behind that decision are still true.
Review the four changes that can justify a new target
- Goal: You are saving for a different purpose, or the amount you need has changed.
- Time horizon: The date when you will need the money has moved closer or farther away. The SEC investor guide identifies a change in time horizon as a common reason to change allocation.
- Financial situation: Income, emergency reserves, debt, expected cash needs or other circumstances have materially changed.
- Risk tolerance or risk capacity: Your willingness or ability to withstand losses is different from when the plan was created.
A price decline by itself is not one of these changes. If your objectives and circumstances are intact, keep the target and evaluate whether the portfolio has drifted outside your rule. Changing from a long-term allocation to an all-cash position solely because a correction feels uncomfortable is a plan change based on a market forecast, not ordinary rebalancing.
Measure the portfolio’s drift
Use current market values, not the original amount invested. For each major category, calculate:
current percentage = category value ÷ total portfolio value × 100
Then calculate the difference from the target:
drift = current percentage − target percentage
Include all accounts that are part of the plan, or document clearly if you are applying the rule to one account only. Otherwise, an account-level calculation can hide an overweight or underweight in the household portfolio.
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Illustrative drift examples
| Source and example | Starting or target mix | Mix after market movement | What the example shows |
|---|---|---|---|
| U.S. Securities and Exchange Commission guide; hypothetical example | 60% stocks | 80% stocks | Performance can materially increase the stock share, creating a reason to compare with the target and consider rebalancing. |
| Vanguard; hypothetical example | 70% stocks / 30% bonds | 76% stocks / 24% bonds | A 5-percentage-point threshold would be an example trigger: stocks are 6 points above target and bonds are 6 points below. |
| Investor.gov Director’s Take; hypothetical example | 80% stocks / 20% bonds | 85% stocks / 15% bonds | A five-point shift in each direction illustrates how a threshold can identify drift without requiring a market forecast. |
These figures are illustrations, not evidence that any particular allocation is suitable. Do not treat the five-percentage-point example as a universal rule. The SEC describes both calendar reviews and preselected percentage approaches; Vanguard presents the five-point rule as an example.
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Choose a trigger before you trade
Your trigger determines when you inspect the portfolio and when a difference is large enough to act. Decide it in advance, while you are not reacting to headlines.
Calendar-based review
Inspect and, if necessary, rebalance on a recurring date. SEC investor materials cite six- or twelve-month intervals as examples of commonly recommended regular reviews. A calendar check is simple and makes it less likely that you forget, but it can produce trades even when the portfolio has barely moved.
Threshold-based review
Trade only when a category moves a specified number of percentage points from its target. The five-point example above is one possible rule, not a regulator-mandated level. A threshold can limit unnecessary trades, but it requires you to monitor the portfolio often enough to notice a breach.
Combined calendar and threshold review
Check on a schedule and act only when the drift exceeds your chosen limit. This combines a reminder with a cost-control rule. Vanguard describes calendar, threshold and combined approaches; the appropriate choice depends on how practical the process is for you.
Decide how much to restore
Once a trigger is met, choose whether to make a partial adjustment or return all the way to target.
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Partial rebalancing
Move only enough to bring the largest overweights back inside the permitted band. This can reduce the number of shares sold and may limit tax or transaction consequences in a taxable account. Vanguard includes partial rebalancing among its suggestions and recommends prioritizing the asset classes that are furthest out of band.
Full return to target
Trade until each major category is at, or very close to, its stated target. This is straightforward and restores the risk profile more completely, but it may require larger sales and purchases. In a taxable account, that can create more realized gains than a partial adjustment.
Use the same extent rule consistently. If you switch between partial and full corrections based on current headlines, the process becomes an attempt to time the market.
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The SEC describes three basic methods. You can use one or combine them.
Sell overweight holdings and buy underweights
Sell enough of the overweight category and use the proceeds to purchase the underweight category. This is the fastest way to move toward the target, but selling in a taxable account can have tax consequences and trades can incur fees or spreads.
Direct new contributions to underweights
Change the destination of future deposits so that new money goes to categories below target. This can reduce or eliminate the need to sell. It works best when you are still adding money and the contribution amount is meaningful relative to the drift.
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Use dividends, interest and other cash flows
Direct dividends and interest toward underweighted categories. If you are withdrawing money, Vanguard suggests starting with overweight categories. These cash-flow choices can shift percentages without an immediate sale of an underweight position.
Combine cash flows with selective sales
Use contributions and income first, then sell only what remains necessary. This approach can reduce the size of taxable transactions while still bringing the most extreme drift back within your rule.
Account for taxes and trading costs
The account holding an investment changes the consequences of a trade. Fidelity notes that account type affects tax consequences and that frequent transactions can create unnecessary costs. Before placing an order, identify whether it is in a taxable account or a tax-advantaged account and review the rules that apply to that account.
Taxable accounts
A sale can realize a gain or loss. The amount and treatment depend on your purchase history, holding period, account records and applicable tax rules. Vanguard suggests considering higher-cost-basis shares when making a taxable sale, but that is a tactic to evaluate—not a guarantee that taxes disappear or that it is best for every investor.
Compare the expected benefit of reducing drift with the tax and trading cost of the transaction. If a contribution or cash-flow adjustment can accomplish the same correction, it may avoid an immediate sale; it does not remove all tax considerations from your broader situation.
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Trades inside a tax-advantaged account can have different tax treatment from trades in a taxable account, but the exact rules depend on the account type and your circumstances. Transaction fees and fund expenses can still matter. Check the account’s current terms and, when the decision is material, obtain individual tax advice.
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Trading costs
Check commissions, bid-ask spreads, fund trading policies and any account-level charges before submitting orders. A series of small trades can cost more than one planned adjustment. Fidelity’s warning about unnecessary costs is particularly relevant when you use a very tight threshold or review too frequently.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How do I rebalance my portfolio?
- Record the plan. List each target category, its target percentage, the accounts included and the drift rule or review date you selected.
- Update values. Use current values for every holding and calculate each category’s percentage of the total.
- Identify breaches. Compare each current percentage with its target and mark categories outside your permitted band.
- Check the reason. Confirm that the drift came from market movement or cash flows, not from an unrecorded change in your goals, time horizon, finances or risk tolerance.
- Choose the method. Decide whether contributions, dividends, interest, withdrawals, sales or a combination can correct the largest gaps.
- Estimate consequences. For every proposed sale, review account type, potential tax effects, cost basis, fees and spreads.
- Set the trade size. Apply your partial- or full-rebalance rule rather than reacting to the day’s market direction.
- Place and document trades. Record the date, amount, resulting percentages and reason so the next review follows the same process.
- Reset the next review. Use your calendar, threshold or combined rule; do not create a new trigger because the correction was emotionally difficult.
Should you rebalance during a market downturn?
You can rebalance during a downturn when your preselected rule says to do so and the underlying plan still fits. A correction may make an overweight stock category smaller rather than larger, so the required action could be to buy an underweight category or simply wait for contributions to do the work. The direction of the trade depends on the measured drift, not on the label “correction.”
Do not force a trade merely because prices have fallen. First verify the target, the threshold and the cash or tax consequences. If your risk tolerance or time horizon has changed, address that as a separate plan decision; do not disguise it as routine rebalancing.
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Use the review rule you can follow consistently. A six- or twelve-month check is described by the SEC as a commonly recommended interval. Vanguard reports that its research finds annual rebalancing optimal for many investors, while also cautioning that the schedule should be practical. That is Vanguard’s provider research, not a universal regulator rule.
A threshold rule can be more responsive when markets move sharply, but it requires monitoring. A combined schedule-and-threshold rule may suit investors who want a reminder without trading on every small movement. Whatever you choose, write it down before the next correction.
Target-date funds and delegated rebalancing
The SEC’s investor material explains that target-date fund managers make allocation and rebalancing decisions inside the fund. If you hold one, learn how it changes its mix over time and avoid duplicating its process blindly with other accounts.
Review the whole portfolio, not just the fund. A target-date fund may be appropriately balanced on its own while additional stock or bond holdings outside it shift your household allocation. Decide whether the fund is the complete plan or one component, then apply your target and drift rule to that complete picture.
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Common mistakes to avoid
- Changing the target after every decline: This turns a long-term allocation into a sequence of market forecasts.
- Using a threshold without defining the measurement: State whether the percentage is measured against the total household portfolio, one account or a particular category.
- Ignoring cash flows: Contributions, dividends, interest and withdrawals can move the mix and may offer a lower-cost adjustment path.
- Selling without checking the account: Taxable and tax-advantaged accounts can have different consequences.
- Trading every time a percentage changes slightly: Frequent transactions can create unnecessary costs.
- Assuming a five-point rule is mandatory: It is an illustrative approach from Vanguard, not a universal trigger.
- Rebalancing one account while overlooking the rest: The result may leave the overall plan materially over- or underweight.
- Duplicating a target-date fund’s trades: The fund already performs its own allocation and rebalancing decisions.
A decision framework for the next correction
Use this sequence when prices have moved sharply:
- Plan: Are your goal, time horizon, financial situation and risk tolerance unchanged? If yes, keep the target.
- Measure: What percentage does each category represent now, and how far is it from target?
- Trigger: Has the difference crossed your written calendar, threshold or combined rule?
- Method: Can contributions, income or withdrawals correct it before you sell?
- Cost: If a sale is needed, what taxes, fees, spreads and account rules apply?
- Extent: Does your policy call for a partial move or a full return to target?
- Record: Document the result and the next review date.
This framework keeps the decision tied to the investment plan. It also makes room for the issues that a percentage-only rule cannot see: a changed life circumstance, a taxable sale or a portfolio that includes an internally rebalanced fund.
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