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There is no single right mix of stocks, bonds and cash. Choose an allocation based on when you will need the money and how much investment loss or volatility you can tolerate, then diversify within each category and rebalance under a consistent policy. The framework below draws on U.S. Securities and Exchange Commission investor-education materials; it is general information, not individualized financial, tax or legal advice.
Start with the goal and the date you need the money
Decide what the portfolio is for and when you expect to use it. The SEC identifies time horizon and risk tolerance as major factors in asset allocation: a longer horizon may make it easier to tolerate volatile investments, while a short-term goal may call for less risk. Its examples contrast saving for a home down payment with investing for retirement over a longer period; they illustrate different circumstances, not prescribed portfolios. SEC asset allocation and diversification guide.
Consider both your willingness to see the portfolio fall in value and your practical ability to wait through a downturn. The appropriate mix is the one that fits the goal and the risk you can bear—not an age-based formula or a recent market winner.
Know what stocks, bonds and cash contribute
| Category | General role and tradeoff | Important qualification |
|---|---|---|
| Stocks | Historically the riskiest of the three broad categories, with the greatest potential returns. | Prices can fluctuate substantially and losses are possible; greater potential return is not guaranteed. |
| Bonds | Generally less volatile than stocks, with more modest returns. | Risk varies; some higher-risk bond categories are exceptions to the broad comparison. |
| Cash equivalents | Generally the safest of the three categories and useful for money needed sooner. | They typically offer the lowest return and can lose purchasing power to inflation. No category is risk-free. |
These are broad historical characterizations in the SEC guide, not promises about future performance. See the SEC’s descriptions of asset categories.
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Choose a target allocation without treating an example as a rule
Translate the goal, time horizon and risk tolerance into a target mix. A near-term need may lead you to prioritize stability; a long-term goal may allow you to accept more market fluctuation in pursuit of growth. Your circumstances, including a changed goal or financial situation, can justify reviewing that target.
The SEC’s 2021 bulletin shows 50% stocks, 40% bonds and 10% cash as one common allocation example. It is an illustration in a bulletin—not an SEC recommendation and not a universal prescription. SEC Investor Bulletin: Asset Allocation, Diversification, and Rebalancing.
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Diversify both between and within categories
Asset allocation spreads investments across categories; diversification also spreads exposure within each category. A portfolio containing several funds is not necessarily diversified if those funds hold many of the same companies or focus on a narrow sector. Check fund holdings and overlap rather than counting funds.
- Stocks: Look for exposure across companies and sectors rather than relying on a small handful of businesses.
- Bonds: Consider whether holdings are concentrated in a particular issuer or bond type; risk differs across bond categories.
- Funds: Mutual funds and ETFs can pool many investments, but a narrowly focused fund or overlapping funds can still leave a portfolio concentrated.
The SEC guide names stocks and stock funds, corporate and municipal bonds, bond funds, lifecycle funds, ETFs, money market funds and U.S. Treasury securities as examples of investment choices. These examples are not endorsements of any security or provider. SEC guide to allocation and diversification.
Rebalance when the portfolio drifts from its target
When categories perform differently, their shares of the portfolio change. Rebalancing returns the mix toward the target you chose; it is a way to manage portfolio risk, not a forecast of which investment will perform best next.
Choose a rebalancing policy
Investor.gov describes two common approaches: review on a schedule—six- or twelve-month intervals are examples some experts use—or rebalance when an allocation crosses a preset percentage threshold. These are options, not required intervals. The SEC says rebalancing tends to work best relatively infrequently. Investor.gov rebalancing guidance.
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Use a method that fits your account
- Sell some holdings in categories that have grown above target and buy holdings in categories that have fallen below it.
- Use new money to buy underweight categories instead of selling existing holdings.
- Redirect ongoing contributions toward categories below target.
Selling can involve transaction fees or tax consequences, depending on the account and jurisdiction. Consider those effects before trading; using contributions to address an imbalance is another method identified by the SEC. SEC rebalancing methods and cautions.
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Know what a target-date fund handles
A target-date fund’s adviser generally manages rebalancing within the fund. Its allocation is typically intended to become more conservative as the target date approaches. That approach can reduce the need to rebalance the fund yourself, but the fund still has an allocation and investment risks to understand.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Revisit the target when your circumstances change
A market move alone does not mean you need a new investment strategy; rebalancing can restore the original risk level. Reconsider the target allocation if the goal, expected use date, risk tolerance or financial circumstances change. The SEC’s materials provide a general decision framework, not current yield comparisons, product-fee data or individualized investment advice.
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