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There is no single right mix of stocks, bonds, and cash for everyone. Build your allocation around when you expect to use the money and how much volatility or loss you can tolerate. Then diversify within each category and rebalance with a consistent policy.
Start with the goal and its time horizon
Decide what the money is for and when you will need it. The U.S. Securities and Exchange Commission (SEC) says asset allocation depends largely on time horizon and risk tolerance: a longer horizon may make volatile investments more tolerable, while a short-term goal may call for less risk. An all-cash down-payment goal and a long-term retirement goal are different situations, not templates for everyone. See the SEC’s guide to asset allocation and diversification.
Consider both your willingness to tolerate market swings and your ability to absorb a loss without derailing the goal. Your allocation is a decision about the risk you can live with while pursuing that goal; age alone does not determine it.
Understand the roles and risks of stocks, bonds, and cash
| Category | General role and tradeoff | Important risk |
|---|---|---|
| Stocks | Historically the riskiest of the three broad categories, with the greatest potential returns. | Prices can swing substantially, and losses are possible. |
| Bonds | Generally less volatile than stocks, with more modest returns. | Some bond categories carry higher risk; bonds are not risk-free. |
| Cash and cash equivalents | Generally the safest of the three categories for nominal value, but with the lowest return. | Inflation can erode purchasing power. |
These are broad historical descriptions, not guarantees of future performance. No category is risk-free, and returns are not guaranteed. The SEC’s overview of investment choices includes stocks and stock funds, corporate and municipal bonds, bond funds, lifecycle funds, exchange-traded funds (ETFs), money market funds, and U.S. Treasury securities. These are examples, not endorsements of particular investments or providers.
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Choose a mix for your circumstances, not a formula
Use the goal, time horizon, and risk tolerance to decide how much exposure to each category is appropriate. A short horizon can make a large market decline harder to recover from before the money is needed; a longer horizon may leave more time to ride out volatility. Your actual capacity for loss also matters: a theoretically long horizon does not help if a downturn would force you to sell or abandon the plan.
An SEC bulletin published in 2021 gives 50% stocks, 40% bonds, and 10% cash as one common allocation example. That is an illustration, not an SEC recommendation or a prescribed mix for investors. The source does not establish a universally suitable allocation or a current recommended portfolio. See the SEC investor bulletin.
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Diversify both across and within categories
Asset allocation is the split among stocks, bonds, and cash. Diversification also means spreading investments within each category so the portfolio does not depend too heavily on a few issuers, companies, sectors, or bond types. The SEC summarizes the principle as “don’t put all your eggs in one basket.”
- Stocks: Look for broad exposure across companies and sectors rather than relying on a handful of companies or one narrow industry.
- Bonds: Consider concentration across issuers and bond types; a bond holding is not automatically diversified just because it is a bond.
- Funds: A mutual fund or ETF can pool many holdings, but a sector-focused fund may be concentrated. Several funds can also own many of the same largest holdings.
Check what funds actually hold and how much their holdings overlap. The number of funds in an account is not, by itself, evidence of diversification. The SEC explains these distinctions in its asset allocation and diversification guide.
Set a rebalancing policy
When categories perform differently, their shares of the portfolio drift from the chosen allocation. Rebalancing brings the portfolio back toward that target; it is a way to restore the risk level you selected, not a forecast about which investment will perform best next.
Choose how to rebalance
- Sell some holdings that have grown beyond their target share and use the proceeds to buy underweight categories.
- Use new money to buy underweight holdings instead of selling.
- Redirect ongoing contributions toward underweight categories until the mix moves closer to target.
The SEC lists these approaches in its rebalancing guidance. Before selling, consider transaction fees and tax consequences, which can depend on your account and jurisdiction.
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Pick a review approach
Investor.gov describes two common approaches: review on a schedule, with six- or twelve-month intervals as examples some experts use, or rebalance when allocations cross percentage thresholds you set in advance. These are options, not mandatory intervals. Investor.gov says rebalancing tends to work best relatively infrequently. Avoid changing the portfolio simply because one category has recently done well.
A target-date fund generally has an adviser who handles rebalancing within the fund. Its allocation is typically designed to become more conservative as the target date approaches. This shifts the maintenance task to the fund, but the allocation still needs to suit your goal and circumstances. More detail appears in Investor.gov’s explanation of rebalancing.
Revisit the target when your circumstances change
A change in the goal, the date you expect to use the money, your risk tolerance, or your financial circumstances may justify reviewing the target allocation. Treat that as a deliberate decision about the plan rather than a reaction to recent market performance.
This framework draws on U.S. SEC investor education materials and is general information, not individualized financial, tax, or legal advice. It does not establish current yields, fees, or a suitable allocation for a particular investor.
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