Investors can manage portfolio risk without predicting market highs and lows by choosing an asset mix that fits their goals, time horizon and tolerance for losses, diversifying that mix, and rebalancing according to a rule set in advance. These steps can keep a portfolio aligned with a plan; they cannot eliminate market risk or guarantee gains.
Start with the goal, not a market forecast
Asset allocation is how a portfolio is divided among categories such as stocks, bonds and cash. The appropriate mix depends on what the money is for, when it will be needed, and how much loss the investor can tolerate. There is no single allocation that suits everyone. The SEC’s Asset Allocation and Diversification guidance and its Beginners’ Guide to Asset Allocation, Diversification, and Rebalancing explain these considerations.
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A shorter time horizon generally leaves less time to recover from a market decline, so a goal coming due soon may call for less exposure to volatile investments than a distant goal. Potential reward and risk are linked: reducing exposure to volatile assets may also limit the opportunity for growth. Revisit the allocation if the goal, time horizon or ability and willingness to bear losses changes.
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Holding different kinds of assets can reduce reliance on any one category. Diversification also means spreading investments within a category—for example, across industries, issuers and companies—rather than concentrating in a small number of holdings. Check what funds actually own: a mutual fund or ETF focused on a narrow sector is not necessarily diversified, and several funds may hold many of the same investments. The SEC’s asset allocation guidance describes diversification as a way to manage concentration, not as a guarantee against losses.
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Choose a rebalancing rule before markets move
When investments perform differently, their portfolio weights drift from the chosen allocation. Rebalancing means adjusting holdings to bring the mix back toward the plan. It is a maintenance decision, not a prediction about what markets will do next. The SEC says rebalancing generally works best relatively infrequently; its guidance describes two common approaches:
- Calendar review: Check the allocation on a recurring schedule, such as at a regular annual review, and rebalance if it has moved materially from the target.
- Allocation threshold: Set percentage limits in advance and review or rebalance when an asset class crosses its limit.
Either method can create a consistent trigger. Avoid turning routine maintenance into frequent trading: before selling, consider transaction charges and possible tax consequences. Those consequences depend on individual circumstances. See the SEC’s rebalancing guidance.
Decide how much of the process to manage yourself
Investors who prefer to set and maintain their own allocation can use a diversified mix and apply a calendar or threshold rule. An all-in-one target-date fund is another approach: these funds typically change their stock-and-bond mix over time, often becoming more conservative as the target date approaches. Strategies and glide paths differ, so compare the fund’s target date and allocation path with the goal it is meant to serve. Also review its fees and other account costs. The SEC’s Target Date Funds bulletin, dated March 25, 2025, explains how these funds work.
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Include fees and taxes in the decision
Investment and account charges reduce the amount left invested and able to earn returns. Review fund prospectuses, account disclosures, fee schedules and statements, and include trading costs when considering a rebalance. To illustrate the long-term effect of annual fees, the SEC’s July 23, 2025 bulletin gives hypothetical values for a $100,000 investment growing at 4% a year for 20 years: approximately $208,000 with a 0.25% annual fee, $198,000 with a 0.50% fee, and $179,000 with a 1.00% fee. These are illustrations, not actual performance or a forecast. The SEC’s How Fees and Expenses Affect Your Investment Portfolio discusses how costs affect an account.
Use a repeatable portfolio review
- Name the goal and date: Identify what the money is for and when it is likely to be needed.
- Set a tolerable allocation: Consider the goal’s time horizon and your capacity and willingness to withstand losses.
- Inspect diversification: Review holdings across asset classes and within funds for concentration and overlap.
- Write down a rebalancing trigger: Choose calendar reviews or thresholds before market movements create pressure to react.
- Check costs and personal consequences before trading: Review fees and consider that sales may have tax implications; consult a qualified professional if your circumstances warrant it.
What this approach can—and cannot—do
Allocation, diversification and disciplined rebalancing aim to keep risk suited to a goal rather than remove it. As Investor.gov puts it, “Diversification can’t guarantee that your investments won’t suffer if the market drops.” The aim is a level of risk that fits the goal and the investor—not certainty or a loss-free portfolio.
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