A market correction is a reason to check your portfolio—not an automatic signal to trade. Compare your current holdings with the target allocation chosen for your goals and risk tolerance. Rebalance only when the portfolio has moved beyond your preselected tolerance, or when your personal plan has genuinely changed. Choose the least costly method available, accounting for taxes, fees and any rebalancing already performed inside your funds.
What rebalancing does after a correction
Portfolio rebalancing restores the mix of asset categories you selected in advance. If stocks, bonds or another category rises or falls by a different amount, its percentage of the portfolio changes even when you make no trade. Rebalancing moves the portfolio back toward its intended risk level rather than trying to predict the next market move.
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For example, a portfolio designed to hold 60% stocks and 40% bonds could become 80% stocks after stocks outperform. The U.S. Securities and Exchange Commission (SEC) uses that as a hypothetical illustration of allocation drift. The correction itself does not prove that the 60/40 plan is wrong. It may simply mean that the portfolio needs to be restored to the plan.
Change the target allocation only if the reason for the plan has changed. Relevant changes include your goal, time horizon, financial situation, risk tolerance, or ability and willingness to tolerate losses. A market move, by itself, is not evidence that your long-term plan should be abandoned.
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This is general U.S. investor education, not individualized investment or tax advice. Tax treatment depends on the account and your circumstances.
How do I rebalance my portfolio?
Use this sequence so that a correction does not turn into an emotional timing decision.
1. Write down the target and why you chose it
List the target percentage for each major asset category in the portfolio you are reviewing. Include the reason for the mix: the goal it serves, when you expect to need the money and the level of loss you were prepared to accept when you selected it.
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Then ask four questions:
- Has the goal changed?
- Has the time horizon shortened or lengthened?
- Has your income, savings, debt or other financial circumstance changed?
- Has your risk tolerance or your ability to withstand a loss changed?
The SEC investor guide identifies changes in time horizon, risk tolerance, financial situation and goal as reasons to reconsider an allocation. If none of those has changed, treat the correction as a portfolio-drift question, not a reason to redesign the plan.
2. Inventory every account and holding
Gather current balances, not the amounts you originally invested. Group holdings into the asset categories used by your plan. A fund may contain several kinds of securities, so use the fund’s stated allocation or prospectus information when deciding which category it represents. Keep taxable and tax-advantaged accounts separate while you assess possible trades; the account type affects tax consequences.
3. Calculate the current percentages
For each category, divide its current value by the total value of the portfolio being measured:
current percentage = category value ÷ total portfolio value × 100
Compare each result with its target percentage. The difference is the drift. A category at 76% against a 70% target is 6 percentage points above target; a category at 24% against a 30% target is 6 percentage points below target.
Measure the complete portfolio you intend to manage. Looking at one account in isolation can hide an overweight or underweight elsewhere if your target was designed across multiple accounts.
When should I rebalance my portfolio?
Use the trigger written into your plan. There is no regulator-established percentage that applies to every investor. SEC materials describe regular calendar reviews and preselected percentage triggers. Vanguard illustrates a five-percentage-point threshold as an example and describes calendar, threshold and combined approaches.
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| Trigger | How it works | What the sources establish |
|---|---|---|
| Calendar | Review and, if needed, rebalance on a recurring date such as every six or twelve months. | The SEC cites six- and twelve-month intervals as commonly recommended examples. |
| Threshold | Trade when an asset category moves outside a percentage band selected in advance. | Vanguard illustrates a five-percentage-point threshold; it is an example, not a universal rule. |
| Calendar plus threshold | Check on set dates and trade only when the allocation is also outside the chosen band. | Vanguard describes this combined approach. |
A calendar rule is easy to follow but can create trades when drift is small. A threshold rule responds to the size of the deviation but requires you to monitor the percentages. The combined rule can limit unnecessary trades while giving you a scheduled review point. Select a rule you can follow consistently rather than one that encourages constant checking.
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Should I rebalance during a market downturn?
Do not sell or buy solely because headlines call the move a correction. First determine whether the portfolio has crossed your rule and whether the original plan still fits your circumstances.
If the target is still appropriate and the drift is outside your band, rebalancing can restore the intended mix. In that situation, the trade is a mechanical response to your plan, not a forecast that prices will recover immediately.
If the target no longer fits because your time horizon, finances or risk capacity changed, revise the plan deliberately before trading. A new allocation should reflect the new circumstances rather than a fear-driven reaction to the recent decline.
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The SEC guide uses the heading “Stick with Your Plan: Buy Low, Sell High.” This describes the discipline of selling portions of categories that have become overweight and buying categories that have become underweight; it is not a promise about what prices will do next.
Choose how far to move back toward target
You do not always have to restore every category exactly to its target in one transaction. Decide the extent before placing orders.
Full rebalancing
Full rebalancing returns the measured categories to their target percentages. It is straightforward when drift is material and trading or tax costs are acceptable.
Partial rebalancing
Partial rebalancing moves only part of the way toward target. It can reduce the largest risk concentration while limiting realized gains, fees or the number of trades. Vanguard lists partial rebalancing as one possible approach. Partial action should still follow a defined rule; otherwise it can become an indefinite delay.
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When several categories are outside their bands, address the most out-of-band categories first. Vanguard suggests prioritizing the asset classes furthest from their targets. Record which categories you left untouched and the condition that will cause the next review.
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Three ways to implement the rebalance
Sell overweight holdings and buy underweights
This is the direct method. Sell enough of an overweight category and use the proceeds to buy an underweight category. It can restore the target quickly, but selling in a taxable account may realize gains or losses and may create transaction costs.
Direct new contributions to underweights
Instead of selling, send new savings to categories below target until the percentages move back toward the plan. The SEC describes directing contributions to underweighted categories as a rebalancing method. This can reduce or avoid sales, although it may take longer and depends on the amount and timing of new money.
Use dividends, interest and other cash flows
Vanguard suggests directing dividends and interest toward underweighted categories. If you are withdrawing money, it suggests starting with overweight categories. These cash-flow choices can shift the mix without an immediate sale of every position.
You can combine the methods: use contributions and distributions first, then sell only the remaining amount needed to stay within the target band. Write down how each cash flow is assigned so that automatic deposits do not undo the adjustment.
| Method | Best use | Main consideration |
|---|---|---|
| Sell overweight, buy underweight | Large drift that needs a prompt correction. | Tax consequences and transaction fees, especially in taxable accounts. |
| New contributions to underweights | Ongoing savers who can correct gradually. | Requires sufficient new money and time. |
| Dividends and interest to underweights | Accounts producing regular cash distributions. | Cash-flow amounts may be too small to correct a large drift quickly. |
| Withdraw from overweights | Investors already taking money out. | Withdrawal needs and account rules still control the decision. |
Taxes, fees and account location
Before selling, identify whether the trade occurs in a taxable account or a tax-advantaged account. The SEC and Fidelity both note that account type affects tax consequences. A sale in a taxable account can create a realized gain or loss; a tax-advantaged account follows its own rules. The sources do not establish one tax outcome for every account, so check the rules that apply to yours and consider professional tax advice when the amounts are significant.
Transaction fees and other trading costs also matter. Fidelity cautions that frequent transactions can generate unnecessary costs. Compare the expected benefit of moving closer to target with the cost of the order, spread, fee or tax consequence.
Vanguard suggests considering higher-cost-basis shares in taxable accounts when selecting what to sell. That may reduce the size of a realized gain, but it does not eliminate tax and is not automatically appropriate for every investor. Check the cost basis and holding details for the specific lots before submitting an order.
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- Confirm the account type and the tax lot or cost-basis information.
- Estimate the gain or loss that the sale would realize.
- Check the broker’s current transaction charges and any fund-level costs that apply.
- Compare a direct sale with contributions, dividends, interest or withdrawals that could reduce the sale.
- Keep a record of the decision and the assumptions used.
Worked examples of drift
SEC 60/40 illustration
The SEC uses a hypothetical portfolio that starts at 60% stocks and 40% bonds. After market performance, stocks represent 80% of the portfolio. The example shows why percentages, rather than the original dollar contributions, should drive the review: the portfolio’s risk exposure has changed even though the investor did nothing.
The correct response is not automatically to sell everything that rose. The investor would compare the 80/20 result with the written target and threshold, then choose a tax- and cost-aware method to move toward the target if the rule requires it.
Vanguard 70/30 illustration
Vanguard gives a hypothetical example of a portfolio targeted at 70% stocks and 30% bonds that drifts to 76% stocks and 24% bonds. Under the provider’s illustrated five-percentage-point threshold, both categories are six percentage points from target, so the example would prompt review under that rule. The five-point band is an example, not a recommendation that fits every plan.
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Investor.gov 80/20 illustration
An Investor.gov Director’s Take article presents a hypothetical portfolio moving from 80% stocks and 20% bonds to 85% stocks and 15% bonds. As with the other examples, the numbers demonstrate drift; they do not establish a study result or dictate a trade for every investor.
A practical execution checklist
- Open the written investment policy or other record of your target allocation.
- Confirm that your goal, time horizon, financial situation and risk tolerance still support that target.
- Collect current balances across the accounts covered by the plan.
- Classify each holding and calculate the current percentage for every major category.
- Compare each percentage with the preselected tolerance and identify the largest deviations.
- Choose full or partial rebalancing before looking at individual trades.
- Apply contributions, dividends, interest or withdrawals to underweights where practical.
- For any sale, check account type, tax lots, cost basis, fees and other transaction costs.
- Place only the orders needed to carry out the written decision.
- Record the post-trade percentages, date, costs and the next review trigger.
How often should you review the portfolio?
Separate reviewing from trading. A review measures drift and confirms that the plan still fits; a trade occurs only when your rule or circumstances call for one.
The SEC describes six- or twelve-month review intervals as examples. Vanguard describes calendar, threshold and combined schedules and reports that annual rebalancing is optimal for many investors in its research. A practical schedule is one you can maintain without reacting to every daily price change. Put the date on your calendar and use the same calculation each time.
Review sooner when a material personal change affects the plan—such as a changed goal, time horizon, financial situation or risk tolerance. Do not use a review schedule as permission to override the plan whenever a market story feels urgent.
Check whether a fund already rebalances for you
Target-date fund managers make allocation and rebalancing decisions inside the fund, according to the SEC’s investor article. If you hold one, learn what role it plays in your overall portfolio. Adding separate holdings with the same risk exposure can leave your total portfolio different from what you intended, while making manual trades inside the fund unnecessary.
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Common mistakes and how to correct them
Changing the target after every correction
Problem: The target becomes a record of recent performance rather than a plan for the goal.
Fix: Change it only after reviewing the goal, time horizon, finances and risk tolerance.
Using a threshold that was never selected in advance
Problem: The investor chooses a percentage because it feels comfortable after prices move.
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Ignoring the whole portfolio
Problem: One account looks balanced while another account creates an overall overweight.
Fix: Measure all accounts included in the plan, then decide where the least costly trade can occur.
Selling without checking tax lots or fees
Problem: A seemingly small adjustment creates an avoidable tax bill or trading cost.
Fix: Check account type, cost basis, available lots, fees and cash-flow alternatives first.
Duplicating a target-date fund’s work
Problem: Manual trades conflict with the fund’s internal allocation process.
Fix: Understand what the fund already manages and rebalance only the broader portfolio that sits outside it.
Trading repeatedly because prices keep moving
Problem: Frequent transactions increase costs and can turn rebalancing into market timing.
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Fix: Follow the calendar, threshold or combined rule and wait for the next defined review unless your personal plan changes.
What to document for the next review
Keep a short record containing the target allocation, the selected trigger, the date measured, current percentages, trades or cash-flow changes, estimated costs and the next review date. Also note why the target remains appropriate. This makes the next correction a repeatable process rather than a new emotional decision.
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