After a stock-market rally, compare your portfolio with the allocation you chose for the goal it serves. If stock gains have pushed it away from that target, rebalancing can restore your intended mix of stocks, bonds, and cash. A rally alone is not a reason to raise your stock allocation: restoring a target is different from changing it.
This is general U.S.-oriented investor education, not individualized investment, tax, or legal advice. The right allocation and any trades depend on your circumstances.
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Why a rally can change your portfolio without any trades
When stocks rise faster than bonds or cash, stocks become a larger percentage of a portfolio even if you have not bought or sold anything. That shift can leave you taking more investment risk than you intended. A rally can therefore be a reason to check your allocation—not a signal that you should chase the recent winners.
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The SEC’s Investor.gov guide describes a hypothetical portfolio whose stock share moves from 60% to 80% after market performance. That example illustrates how drift can happen; it is not a recommended allocation. Your own target should reflect the goal, time horizon, financial situation, and risk tolerance relevant to that account. Different goals can reasonably call for different allocations.
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Rebalancing is not the same as changing your target
Rebalancing means bringing your actual holdings back toward an allocation you have already chosen. Changing your target means making a new allocation decision. The first addresses drift; the second should follow a meaningful change in your circumstances or plan, not simply the fact that stocks have recently done well.
As the SEC puts it, “savvy investors typically do not change their asset allocation based on the relative performance of asset categories”—for example, by increasing their stock allocation because the market is hot. Vanguard likewise describes rebalancing as a way to manage risk, not maximize returns. It is a discipline for maintaining a chosen risk mix, not a promise of better performance.
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How to decide whether to rebalance
1. Recheck the target for this goal and account
Find the target allocation in your investment plan, account settings, or fund documentation. Check whether the goal, time horizon, financial situation, or tolerance for losses has changed. If it has, reconsider the target as a separate decision before treating the portfolio’s current mix as drift.
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Compare the current percentages in stocks, bonds, and cash with the target percentages. Use the same categories on both sides of the comparison, and assess the portfolio that actually serves the goal. If you hold several funds, look through to their underlying holdings where practical; a fund’s label alone may not show your full exposure.
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3. Apply a review rule you can follow
There is no official universal rebalancing schedule. The SEC gives calendar reviews, such as every six or twelve months, and a threshold set in advance as examples. FINRA also notes that there is no official timeline. Vanguard discusses calendar-based, threshold-based, and combined approaches.
- Calendar review: Check on set dates, such as once or twice a year. This is straightforward to schedule, but the portfolio may drift between reviews.
- Threshold review: Check whether an allocation has moved a chosen amount away from its target. This can respond to drift when it happens, but requires monitoring. Set the trigger in advance rather than choosing one to justify a trade after a rally.
- Combined rule: Review on a schedule and act if a preselected threshold has been crossed. This pairs a predictable review routine with a drift trigger.
Vanguard illustrates a 70/30 target that drifts to 76/24 and a five-percentage-point threshold. These figures are an example, not a universal threshold or recommendation. Choose a rule that suits your circumstances and that you can apply consistently.
Ways to bring the portfolio back toward target
The right method depends on how far the portfolio has drifted, whether new cash is available, and the account’s tax and transaction-cost implications.
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|---|---|---|
| Direct new contributions or income | Put contributions, dividends, or interest toward categories below target. | Can reduce the need to sell appreciated holdings, but may take time to correct a large drift. |
| Use withdrawals or cash flows | Where appropriate, take withdrawals from categories above target or direct available cash to underweights. | May help adjust the mix without selling as much, but depends on the account and the cash flows available. |
| Sell and buy | Sell some of the overweight assets and use the proceeds to buy underweight categories. | Can move the portfolio toward target more quickly, but sales in a taxable account may realize capital gains, and transactions may have fees. |
These methods can be combined. For example, directing new contributions toward an underweight category may reduce the amount that needs to be sold. Vanguard also discusses partial rebalancing and, in taxable accounts, considering higher-cost-basis shares when selling. The tax result depends on the holding and account; do not assume that a sale is tax-free or that any particular lot-selection choice is right for you.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Check taxes, fees, and account rules before acting
Before placing trades, identify which account holds the assets and review its rules, transaction costs, and possible tax consequences. FINRA flags that selling appreciated assets in a taxable brokerage account may result in capital-gains taxes. Vanguard notes that transaction costs and tax effects matter when choosing how to rebalance. The sources do not establish what a particular trade would cost or how it would be taxed for you.
- Consider whether available contributions, dividends, interest, or withdrawals can reduce drift before selling.
- Check whether proposed trades involve fees or other account-specific costs.
- In a taxable account, consider potential realized gains before selling appreciated holdings; consult a qualified tax professional if you need advice on your situation.
- If the amount at stake or the tax treatment is unclear, consider seeking qualified individualized financial or tax advice before trading.
When a target-date fund may reduce the work
A target-date mutual fund or ETF typically changes its investment mix over time, often shifting toward bonds as its target date approaches. This can be an alternative for investors who prefer not to manage allocation changes themselves, but it is not a universal solution.
Funds with the same target date can have different investment strategies, risk levels, glide paths, and fees. A “to” glide path generally reaches its most conservative mix around the target date; a “through” glide path continues changing the mix beyond it. Review the fund’s prospectus and compare its strategy, glide path, costs, and fit with your goal. Target-date funds do not guarantee sufficient retirement income.
Keep the policy simple enough to maintain
Write down the target allocation for each goal, the review dates or drift trigger, and how you will account for cash flows and costs. Revisit the policy when your circumstances change, rather than changing it in response to each market move. Vanguard’s Q4 2025 advisor article reported an aggregate equity allocation of 62.4% as of November 30, 2025, based on Morningstar data comparing equity, bond, and money-market fund allocations. That industry figure describes aggregate allocations; it is not a model portfolio or a recommendation for an individual investor.
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