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If a market correction has changed your portfolio’s percentages, first compare its current allocation with the plan you chose for your goal. If your goal, time horizon, risk tolerance and financial circumstances have not materially changed, rebalancing may bring the portfolio closer to that plan. You can use new contributions to add to underweight assets, sell overweight holdings, or combine the two—but check possible fees and tax consequences before selling. A price drop by itself is not a reason to make a sudden change.

This is general U.S. investor education, not a recommendation for a particular allocation, investment or tax decision. The SEC notes that no single asset-allocation model is right for every financial goal.

First decide whether the plan still fits

A market correction can shift the percentages of assets in a portfolio even when your financial goal has not changed. For example, if one part of a portfolio falls more or rises less than another, it may account for a smaller share of the total than it did before. That change in weights can leave you with a different mix of potential risk and return than the one you intended.

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Before deciding whether to trade, separate two questions: has the portfolio drifted from its allocation, and is that allocation still appropriate for you? The first is about what your holdings now add up to. The second depends on your goal, when you expect to need the money, your comfort with investment risk and your financial circumstances. A change in market prices alone does not answer the second question.

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Review the circumstances behind your allocation

Write down the goal the money is meant to support and the approximate time horizon you planned around. Then consider whether anything material has changed: for instance, whether you expect to use the money sooner, whether your income or financial needs have changed, or whether your willingness or ability to tolerate losses is different. These are reasons to review the plan itself, not just restore old percentages automatically.

If the goal and circumstances still support the allocation you chose, a market decline does not necessarily mean that the allocation has become unsuitable. Conversely, restoring an old mix is not automatically the right answer if your needs have changed. If you are unsure which situation applies, consider getting individualized guidance from a qualified financial professional.

Measure how far the portfolio has drifted

Compare your current holdings with your intended allocation using the same categories on both sides of the comparison. Depending on your plan, these might include broad asset classes such as stocks and bonds, or more detailed categories within them. The aim is to see what share of the portfolio each category represents now and how that compares with your target—not to infer a new target from recent market performance.

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Include accounts across the household when practical

A single account may not show the full picture if you hold investments in several accounts. Where feasible, consider the relevant holdings together so you can see the overall mix. Account types can affect the consequences of a trade, so keep track of where each holding is located rather than treating every account as interchangeable.

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Also look beyond broad categories. Several funds can own overlapping investments, or a collection that appears diversified by fund count may be concentrated in a narrower area. Check whether the composition of an asset class has shifted as well as its percentage of the total. The SEC’s asset-allocation guidance emphasizes diversification as part of evaluating a portfolio; a percentage comparison alone does not reveal every concentration.

Use the same basis for the comparison

For each category, compare its current share of the portfolio with the share in your written plan. Record the date of the review and the figures you used. If you cannot readily determine what a fund holds or how it fits into a category, consult its current materials or ask a financial professional rather than guessing. This produces a more useful review than reacting to a headline or looking at one holding in isolation.

Choose how to bring the mix back toward target

Rebalancing means adjusting a portfolio toward its intended asset allocation after investment performance has shifted the weights. It can help restore the risk profile associated with that allocation, but it does not guarantee a profit or prevent a loss. There are three practical ways to make an adjustment; which is suitable depends on your accounts, available cash, costs and tax circumstances.

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Method What changes Costs and considerations
Sell overweight holdings and buy underweight ones You sell some assets that have become a larger share than intended and use the proceeds to add to underweight categories. Check transaction fees and potential tax consequences before selling. The outcome depends on the account, holdings and your situation.
Use new money for underweight assets You direct available contributions or other new investment money toward the categories that are below target. This may reduce the need to sell, but whether it is enough depends on the size of the drift and the amount of new money available.
Redirect ongoing contributions You change future contributions, such as payroll contributions, to favor underweight categories. This adjusts the mix over time rather than necessarily correcting it immediately. Review the result against your plan on the schedule you set.

You can combine these approaches. For example, you might direct future contributions toward an underweight category and decide separately whether any sale is warranted. Do not assume that using new money is always sufficient, or that selling is always necessary: compare the current mix with the plan and consider the practical consequences of each route.

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Check fees and tax effects before selling

A trade can have consequences beyond changing the allocation. Before selling, consider whether the transaction could incur fees and whether it could have tax consequences. The SEC’s Beginners’ Guide to Asset Allocation, Diversification, and Rebalancing specifically advises investors to consider both before rebalancing.

The applicable result depends on factors such as account type, the holdings involved and your individual circumstances. This article cannot determine whether a particular sale would create a tax bill or what that bill would be. If the tax treatment is unclear, seek advice from a tax professional familiar with your situation. For a complex portfolio or a substantial decision, a financial professional can help you compare the available approaches.

Set a review rule instead of reacting to headlines

A written rule can make it easier to respond consistently rather than making rapid changes because prices have moved sharply. Two common ways to organize reviews are a calendar schedule and a preselected allocation threshold. Neither has one schedule or threshold that works for everyone.

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Calendar review

You can choose to review the portfolio at regular intervals and compare it with the intended mix. SEC educational materials cite six- or twelve-month intervals as examples of schedules some experts recommend. Those intervals are examples, not a universal requirement or a finding that a particular frequency produces better results. The SEC also says rebalancing tends to work best relatively infrequently.

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Preselected drift threshold

Alternatively, you can decide in advance to review when an allocation moves beyond a threshold you have chosen. The threshold is a prompt to compare the portfolio with the plan; it is not, by itself, an instruction to trade. The SEC materials describe threshold-based review but do not prescribe one threshold for all investors.

Whichever approach you use, record the intended allocation, the review method and the date you will next assess it. Avoid changing the rule simply because the market is volatile. A consistent review process can help distinguish a planned adjustment from a reaction to short-term news, but it cannot remove investment risk.

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Check whether a target-date fund already rebalances

A target-date fund generally rebalances its own holdings over time, usually following an investment path associated with a target year. If you own one, find out how its allocation is designed to change and consider how it fits with the rest of your portfolio. Its name alone does not show whether its risk level is appropriate for your goal.

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Funds with the same target date can differ in glide path, risk and fees. A glide path is the way the fund’s allocation changes as the target date approaches and passes. Review the fund’s current disclosures for its actual approach and costs, and take other investments into account. A fund may rebalance internally while the combination of that fund and your other assets still differs from the allocation you intended for your overall portfolio.

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When to get individualized help

Consider speaking with a financial professional if you cannot determine whether the original allocation still suits your circumstances, if holdings across accounts are difficult to assess, or if the goal is close to the point when you will spend the money. An adviser may help evaluate the allocation and the available adjustment methods in the context of your broader finances. A tax professional can address account-specific tax questions.

Any guidance should take account of your goal, time horizon, risk tolerance, financial circumstances, holdings and account types. No general article can calculate a suitable allocation or tax result for an individual investor.

What the SEC guidance does—and does not—establish

The SEC’s Beginners’ Guide to Asset Allocation, Diversification, and Rebalancing explains allocation and rebalancing, outlines calendar and threshold review approaches, and highlights transaction fees and tax consequences. Its examples of allocations changing from 60/40 to 80/20 and from 80/20 to 85/15 are illustrations, not statistics about typical investors or market corrections. The guide does not establish a quantified expected benefit from rebalancing or identify one method that is best for everyone.

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An archived Investor.gov article, Is It Time to Rebalance Your Investment Portfolio?, includes a warning from former SEC Office of Investor Education and Assistance Director Lori Schock against making rash decisions during market volatility. The page states that it is no longer being updated, so that warning is background rather than a current rule. The practical takeaway is to assess your plan and circumstances before acting, not to forecast what markets will do next.

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