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Start with the goal, time horizon, and risk you can bear
Your allocation should reflect when you need the money and how much loss you can withstand. The U.S. Securities and Exchange Commission (SEC) defines time horizon as the period over which you expect to invest toward a goal. A shorter horizon may favor less volatile investments; with a longer horizon, you may have more time to tolerate market swings. Neither case points to a universal allocation.
Risk tolerance includes both your willingness to accept losses and your financial ability to absorb them. Consider the goal’s deadline, your overall financial situation, and whether a decline would force you to sell before you intended. If the goal, timeline, finances, or comfort with risk changes, reassess the allocation itself—not just the holdings that have recently done well or poorly. The SEC explains these considerations in its asset allocation guide.
Choose a mix for the goal, not for a forecast
Stocks, bonds, and cash equivalents have different general risk and return characteristics, but none is a dependable forecast of what will happen next. The SEC describes stocks as historically carrying higher risk and potential return than bonds and cash. Bonds generally have less volatility and more modest returns; cash equivalents generally have low investment-loss risk, though inflation can reduce their purchasing power. High-yield bonds carry more risk than many other bonds. These are broad characteristics, not guarantees that an asset will perform a certain way in the next market decline.
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Different asset categories can perform differently under different market conditions, which is one reason to diversify. But a diversified portfolio can still lose value when markets fall. Investor.gov, the SEC’s investor education site, puts it plainly: “Diversification can’t guarantee that your investments won’t suffer if the market drops.” Read its explanation of diversification.
Diversify both among assets and within them
Holding several asset classes is only one layer of diversification. Within an asset class, exposure can still be concentrated in a few companies, issuers, industries, or sectors. Check what your funds actually own: an ETF or mutual fund is not automatically diversified just because it holds a basket of investments, and two funds may own many of the same securities.
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- Across asset classes: Review how much of the portfolio is in stocks, bonds, and cash equivalents, in light of the goal and your ability to bear losses.
- Within each class: Look at sector and issuer exposure, as well as a fund’s top holdings.
- Across funds: Compare holdings for overlap. Several fund names do not necessarily mean several distinct sources of exposure.
The SEC’s guide to asset allocation and diversification explains why spreading investments both among asset categories and within them matters.
Rebalance when the portfolio drifts from its plan
“Rebalancing is bringing your portfolio back to your original asset allocation mix,” according to the SEC’s Beginners’ Guide to Asset Allocation, Diversification, and Rebalancing. If one part of a portfolio rises or falls more than others, its weight can drift from the allocation you selected. Rebalancing addresses that drift; it is not a bet that a recent winner will keep winning or a recent loser will rebound.
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Choose a consistent review rule
You can review on a calendar schedule or act when an asset’s weight crosses a predetermined threshold. Whichever method you choose, set it in advance and keep the review relatively infrequent; the SEC says rebalancing tends to work best that way. The guide does not prescribe one schedule or threshold for everyone.
Use contributions or trades to restore the mix
Possible approaches include selling some overweight investments, buying underweight investments, or directing new contributions to underweights. Selling can have transaction fees or tax consequences. Consider whether contributions can move the portfolio closer to its target before selling, and get individualized tax or financial advice where appropriate.
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For the SEC’s explanation of methods and trade-offs, see its asset allocation and rebalancing guide.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Decide whether to manage the mix yourself or use a lifecycle fund
A lifecycle or target-date fund may manage allocation and rebalancing for you. You still need to choose a fund that fits the goal and examine its strategy and risks; the label alone does not establish that its mix is suitable for your circumstances. If you manage the portfolio yourself, the same core tasks remain: set an allocation, inspect actual holdings and overlap, and follow a rebalancing rule.
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A practical check before acting in a volatile market
- Has the goal, the date you need the money, your financial situation, or your ability or willingness to accept loss changed?
- Do your actual holdings provide breadth across and within asset classes, or are there concentrated exposures and overlapping funds?
- Has the portfolio moved far enough from your chosen allocation to trigger your predetermined rebalancing rule?
- Could new contributions address underweights, and what fees or tax consequences might follow from selling?
If the allocation still fits and no rebalancing rule has been triggered, a market swing by itself is not a reason to chase recent performance. This is general educational information, not an individualized investment or tax recommendation; the SEC’s materials do not determine an appropriate allocation for any particular reader or predict which assets will hedge the next downturn.
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