Do I Need Bonds in My Portfolio?
Bonds won't make you rich, but they make a portfolio easier to hold through a crash. Here's whether you need them, how much, and why age is only part of the answer.
Don't have time? Here's what you need to know:
- 1Bonds don't boost returns — they cut volatility, which is what helps most investors actually stay the course.
- 2A common guideline is bonds near your age, or age minus 10-20, ranging from ~10-20% when young to 40-60% near retirement.
- 3Even aggressive young investors often keep a small bond sleeve to smooth the ride and aid rebalancing.
- 4A single broad fund like BND or AGG (~0.03%) covers fixed income; bonds can still have mildly negative years.
Do You Actually Need Them?
Strictly speaking, no — a 100% stock portfolio is a valid choice, and over very long periods it has typically out-earned a mix with bonds. But "need" is the wrong frame. Bonds aren't there to maximize returns; they're there to reduce how violently your portfolio swings, which is what lets most people actually stay invested through a crash. A portfolio you panic-sell at the bottom performs far worse than a slightly lower-returning one you can hold.
The real question is how much volatility you can tolerate and how close you are to needing the money. A 25-year-old with decades ahead can ride out a 40% drop; a 60-year-old five years from retirement generally cannot afford to. Bonds are the dial that adjusts your portfolio's smoothness to your situation.
What Bonds Actually Do for a Portfolio
Bonds reduce volatility. When stocks fell sharply in past downturns, high-quality bonds frequently held their value or rose, cushioning the overall hit. A 60/40 stock-bond portfolio has historically fallen far less in bad years than an all-stock one, and that smaller drawdown is precisely what keeps nervous investors from bailing at the worst moment.
They also provide ballast and income. A bond fund like BND pays steady interest and gives you stable assets to draw on or rebalance from, so you're not forced to sell stocks during a downturn. The trade-off is lower expected long-run returns — bonds have historically earned less than stocks — so holding too many for your time horizon costs growth. It's a balance, not a free upgrade.
Tip: A classic rebalancing benefit: when stocks crash and bonds hold steady, selling some bonds to buy cheap stocks forces you to buy low — exactly the discipline most investors lack on their own.
How Much to Hold: Age-Based Starting Points
A common rule of thumb is to hold a bond percentage roughly equal to your age, or your age minus 10 or 20 for a more growth-oriented stance. These are starting points, not prescriptions — your job security, other income, and stomach for volatility matter just as much as your birth year. The table below shows typical allocations across the spectrum.
Notice that even aggressive young investors often keep a small bond sleeve. It's not for the return — it's to dampen volatility enough that they don't abandon the plan, and to have something stable to rebalance from. A 10-20% bond position barely dents long-run growth while noticeably smoothing the ride.
| Life stage | Typical stocks | Typical bonds |
|---|---|---|
| 20s-30s (long horizon) | 80-100% | 0-20% |
| 40s (mid-career) | 70-80% | 20-30% |
| 50s (pre-retirement) | 60-70% | 30-40% |
| 60s+ (at/near retirement) | 40-60% | 40-60% |
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Getting Bond Exposure Through ETFs
You don't need to buy individual bonds. A single broad fund like BND holds thousands of U.S. government and high-quality corporate bonds at a fee around 0.03%, giving you diversified fixed-income exposure in one ticker. AGG is a nearly identical alternative from iShares. For broader reach, an international bond fund such as BNDX adds geographic diversification.
Keep it simple: a single total-bond fund is enough for most portfolios. Pair it with your stock funds at whatever ratio fits your age and temperament, rebalance occasionally, and you have a complete, resilient portfolio. The point of the bond slice isn't to chase yield — it's to make the whole thing easier to live with through the inevitable rough patches.
Important: Bonds aren't risk-free. Their prices fall when interest rates rise, as many holders learned in 2022. They're far steadier than stocks, but a bond fund can still post a negative year — just expect a much milder ride than equities.
Frequently Asked Questions
Do I need bonds in my portfolio if I'm young?
You don't strictly need them, and many young investors run 100% stocks given their long horizon. But even a small 10-20% bond allocation can be worthwhile — not for returns, but because it dampens volatility enough to help you stay invested through a crash and gives you something stable to rebalance from. The right answer depends on your risk tolerance, not just your age.
How much of my portfolio should be in bonds?
A common starting point is a bond percentage near your age, or your age minus 10-20 for a more aggressive stance — so roughly 10-20% in your 20s-30s, rising toward 40-60% by retirement. These are rules of thumb to adjust based on your time horizon, job stability, and tolerance for swings, not fixed rules.
Are bonds safe?
High-quality bonds are far steadier than stocks, but not risk-free. Their prices fall when interest rates rise — bond funds had a notably negative year in 2022 for exactly that reason — and lower-quality bonds carry default risk. A broad fund like BND focused on government and investment-grade corporate bonds is conservative, but expect occasional small declines, not guaranteed gains.
What's the best bond ETF for a simple portfolio?
For most investors, one broad U.S. bond fund covers it — BND from Vanguard or AGG from iShares, both holding thousands of government and investment-grade corporate bonds at around 0.03%. If you want geographic diversification, you can add an international bond fund like BNDX. One total-bond fund is enough; there's no need to overcomplicate the fixed-income side.
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Alex Harrington
CFA Level II Candidate, Finance & Economics
Alex Harrington is an independent ETF researcher and personal finance writer with over 8 years of experience analyzing exchange-traded funds. A CFA Level II candidate with a background in economics, Alex has reviewed 800+ ETFs and helped thousands of beginners build their first investment portfolios through clear, jargon-free education.
This content is for educational purposes only and does not constitute financial advice. Past performance does not guarantee future results. Consult a licensed financial advisor before making investment decisions.