High stock valuations can inform your expectations for long-term returns, but they are not a reliable signal to make a sudden switch into bonds. Choose a bond allocation by starting with your goal, the date you need the money, and the amount of risk you can tolerate and afford. Then decide what kinds of bonds fit that plan and rebalance if your portfolio drifts.
Start with the goal, not the market headline
The right stock-and-bond mix is the one that gives your goal a reasonable chance of being met without exposing you to more risk than you can live with. The SEC’s asset-allocation guide identifies time horizon, financial circumstances, and risk tolerance as important considerations.
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- When is the money needed? A long horizon can make it easier to ride out stock-market declines. Money needed soon generally calls for less exposure to volatile assets.
- What happens if the portfolio falls? Consider both your emotional tolerance for losses and your financial ability to recover from them without derailing the goal.
- What role should bonds play? Bonds are generally less volatile than stocks and can moderate portfolio fluctuations, but they usually offer more modest returns. They are not risk-free: interest rates, issuer credit quality, and inflation can all affect results.
The SEC notes that a portfolio approaching a goal may shift toward bonds and cash; it also cautions that short-term goals may not suit heavy stock exposure. The timing and extent of any shift depend on the investor’s circumstances, not on one universal ratio.
Treat high valuations as context, not a countdown
Expensive stocks do not tell you when prices will fall, or whether bonds will outperform stocks over the next few months or years. Vanguard says valuation measures are poor predictors over short and intermediate periods and should not be the primary reason to change an allocation. Its Capital Markets Model forecasts are hypothetical, based on market conditions, and not portfolio-construction advice.
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Valuations can still matter when you form long-term expectations. The useful distinction is between adjusting assumptions about future returns and trying to time the market. If your existing mix still fits your goal and risk capacity, a headline about stretched valuations alone is not a reason to make a sharp change.
What a model allocation can—and cannot—tell you
Vanguard’s December 30, 2025 example used a time-varying allocation of 40% stocks and 60% bonds, compared with a traditional 60/40 mix. Vanguard said its model projected comparable returns with less risk over the following decade under its then-current assumptions; this was a projection, not a realized result or a guarantee. Roger Aliaga-Díaz, Vanguard’s Global Head of Portfolio Construction, said, “It’s not pessimism about AI or the economy. It’s about risk from a stock market correction,” and that “U.S. equity market valuations are stretched.” Those remarks describe Vanguard’s model view, not a personal recommendation. Vanguard’s explanation of its underweight-stock position gives the dated example.
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In its July 22, 2026 portfolio update, Vanguard said its time-varying portfolios continued to favor bonds over equities relative to its benchmark, while the bond outlook had changed little since the prior quarter. The underlying calculations were as of June 30, 2026. Vanguard also described constrained portfolios designed to preserve intended risk profiles, such as 60/40, and said investors should consider their own objectives, time horizon, and risk tolerance. This remains a firm’s market view and model output, not evidence that every investor should hold more bonds. Vanguard’s portfolio update provides that context.
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A bond percentage does not tell the whole story. Credit quality and interest-rate sensitivity change how a bond allocation behaves, so compare these trade-offs when choosing a fund or mix of holdings.
| Choice | Potential benefit | Trade-off to consider |
|---|---|---|
| Treasuries versus corporate bonds | Treasuries remove issuer credit risk from that part of the portfolio. | Corporate bonds introduce issuer credit risk; higher-yield bonds carry more credit risk than higher-quality bonds. Higher credit quality generally comes with lower yield. |
| Shorter versus longer maturities | Short-term bonds generally have less sensitivity to interest-rate changes. | Longer-maturity bonds tend to fluctuate more when rates change, though they may offer more income than short-term bonds. |
| Nominal versus inflation-linked bonds | Inflation-linked securities are a category to compare if inflation exposure matters to your plan. | Nominal bonds carry inflation risk. No particular allocation to inflation-linked securities is established as suitable for every investor. |
Bond prices generally move in the opposite direction to interest rates. A bond fund’s share price can fluctuate, too; government backing of the securities it holds does not guarantee a stable fund share price. Diversifying across credit quality and interest-rate sensitivity can spread some risks, but concentrating in Treasuries or short maturities is a deliberate trade-off, not a risk-free solution. Vanguard discusses these bond characteristics in its bond-investing overview.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Set a policy, then rebalance to it
Decide on a target allocation based on your goal and circumstances, and use a defined process to bring the portfolio back toward it if market moves cause the weights to drift. Rebalancing restores the chosen mix; it is not the same as making a new strategic allocation because one asset class looks expensive or has recently performed well.
The SEC describes rebalancing as returning a portfolio toward its intended allocation and notes that investors typically should not change their allocation merely because an asset class has recently done well. It does not prescribe one rebalancing frequency or threshold. Choose a method you can follow consistently, and avoid treating a valuation headline as a timing rule.
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A practical decision sequence
- Write down the goal and date. Identify what the money is for and when you expect to use it.
- Assess risk capacity and tolerance. Consider whether a market decline would threaten the goal financially, as well as whether you could stick with the plan emotionally.
- Choose the overall stock-and-bond mix. Set it to fit the goal rather than copying a model portfolio or reacting to a valuation signal.
- Choose bond exposures. Compare credit quality, maturity and interest-rate sensitivity, and the role of inflation protection in your plan.
- Define how you will rebalance. Decide in advance how you will respond when portfolio weights drift, rather than improvising in response to market news.
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