Long-Term Bond Allocation: How Much Do You Need?
Bonds won't make you rich, but they keep you from selling stocks at the bottom. Here's how much a long-term portfolio needs and why the number rises with age.
Don't have time? Here's what you need to know:
- 1Bonds provide ballast, not big returns — they cut drawdowns and keep you from selling stocks at the bottom.
- 2Age-based rules (bonds near your age, or age minus 10/20) are a starting point; match the mix to your horizon.
- 3BND and AGG track nearly the same broad index at about 0.03% and are effectively interchangeable.
- 4Bonds can fall when rates rise (as in 2022), but higher rates now mean higher yields and better expected returns.
What Bonds Are Actually For
Bonds are not in your portfolio to make you rich — over long periods, stocks have outreturned them by a wide margin. Bonds are there for ballast: they cushion the ride, reduce the depth of your drawdowns, and give you something stable to spend or rebalance from when stocks crater. Their job is behavioral as much as financial — keeping you invested when equities are falling 40%.
A broad bond fund like BND or AGG holds thousands of investment-grade U.S. bonds — Treasuries, agency mortgages, and corporates — for a cost around 0.03%. Both track nearly the same index and are close substitutes; the choice between BND and AGG rarely matters in practice.
How Much Should You Hold?
The classic starting point is an age-based rule: hold a bond percentage roughly equal to your age, or a more aggressive variant like 'age minus 10' or 'age minus 20.' A 30-year-old might hold 10-20% bonds; a 60-year-old nearing retirement might hold 40% or more. These are heuristics, not laws, but they capture the right idea — your bond allocation should rise as your time horizon shrinks.
The deeper driver is your capacity and willingness to tolerate losses. A young investor with decades of contributions ahead and a stable income can ride out an 80/20 or even 90/10 portfolio. Someone five years from retirement has far less time to recover from a crash and should carry more bonds. Match the allocation to your horizon and how you actually behave in a downturn, not to a number that looks good on paper.
| Life stage | Typical horizon | Common stock/bond mix |
|---|---|---|
| 20s-30s, accumulating | 30+ years | 80/20 to 100/0 |
| 40s-50s, mid-career | 15-25 years | 70/30 to 80/20 |
| Near retirement | 5-10 years | 50/50 to 60/40 |
| In retirement | ongoing | 40/60 to 60/40 |
Tip: There is no single correct number. Pick a mix you can hold through a 40% stock crash without selling — the best allocation is the one you won't abandon.
How Bonds Cut Volatility and Sequence Risk
Adding bonds reduces a portfolio's volatility because high-quality bonds usually fall less than stocks (and sometimes rise) when equities sell off. A 60/40 portfolio has historically suffered noticeably smaller peak-to-trough losses than an all-stock portfolio, at the cost of somewhat lower long-run returns. For many investors that trade is worth it, because a smaller drawdown is one you are far more likely to hold through.
Bonds also blunt sequence-of-returns risk — the danger of hitting a bad market right as you start withdrawing in early retirement. With a bond buffer, a retiree can spend from bonds during a stock downturn instead of selling equities at depressed prices, giving the stock side time to recover. That single mechanic is one of the strongest arguments for holding bonds as retirement nears.
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Interest Rates, Duration, and the 2022 Lesson
Bonds are not risk-free. When interest rates rise, existing bond prices fall, and the longer a bond's duration, the harder it falls. 2022 was a stark reminder: as rates climbed rapidly, broad bond funds posted one of their worst years on record, and the usual stock-bond cushion failed temporarily because both fell together. That episode shook investors who assumed bonds could never lose much.
The reassuring part is that higher rates also mean higher future income — bond funds now yield more than they did during the near-zero era, which improves their long-run expected return. For a long-term holder, intermediate-term funds like BND and AGG (duration around six years) strike a sensible balance between income and interest-rate sensitivity. The lesson is not to avoid bonds, but to understand that their stability is relative, not absolute.
Important: Bonds can lose value when rates rise, as 2022 proved. They are ballast, not a guarantee — long-duration funds swing more, so most diversified investors stick to intermediate-term broad funds.
Frequently Asked Questions
How much should I hold in bonds for the long term?
It depends on your age and risk tolerance. A common heuristic is to hold a bond percentage near your age, or 'age minus 10/20' for a more aggressive tilt. In practice, young accumulators often hold 0-20% bonds, mid-career investors 20-30%, and those near or in retirement 40% or more. Choose a mix you can hold through a major stock crash.
Is BND or AGG better?
They are nearly interchangeable. Both track almost the same broad U.S. investment-grade bond index, hold thousands of bonds, and cost around 0.03%. Differences in returns and yield are tiny. Pick whichever your brokerage offers commission-free; there is no meaningful long-term advantage to either over the other.
Why hold bonds if stocks return more?
Because bonds reduce how far your portfolio falls in a crash and give you stable assets to spend or rebalance from. That cushion keeps many investors from panic-selling stocks at the bottom and protects against sequence-of-returns risk in early retirement. The goal is a smoother ride you'll actually stick with, not maximum raw return.
Didn't bonds lose money in 2022?
Yes. As interest rates rose sharply, bond prices fell and broad bond funds had one of their worst years ever, with stocks and bonds dropping together. The upside is that higher rates now mean higher bond yields and better expected future returns. Bonds are ballast, not a guarantee — intermediate-term funds balance income against rate sensitivity.
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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.