Bonds are boring. The returns are low. So why do all investment professionals say every portfolio needs them? [1]
What Are Bonds?
A bond is a debt instrument. It’s a promise by a government or corporation to borrow money and pay interest [1]. If stocks represent ownership of a company, bonds are loans to it.
Related: evidence-based supplement guide
Why Bonds Belong in a Portfolio
1. Volatility Buffer
When stocks crash, bonds typically stay stable or rise. During the 2008 financial crisis, US Treasuries returned +5.2% while the S&P 500 fell -37% [2].
2. Predictable Income
Coupon interest is paid on a regular schedule. Useful as living expenses in retirement.
3. Rebalancing Effect
Selling bonds to buy stocks during a stock market decline — rebalancing — improves long-term returns [3].
Which Bonds to Buy?
- US Treasuries — Safest option
- Investment-grade corporate bonds — Slightly higher yield
- TIPS — Inflation-linked
- Bond index fund (BND) — Diversification + low cost
What Bond Allocation for a 30-Year-Old Teacher?
An aggressive formula: age minus 20 = bond allocation percentage. At 30, that’s 10%. For a conservative approach, use your age (30%). Since a teacher’s pension is effectively a bond-like asset, I maintain only 15% in bonds in my personal investments.
See also: index fund guide
Disclaimer: This article is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider with any questions about a medical condition.
Your Next Steps
- Today: Pick one idea from this article and try it before bed tonight.
- This week: Track your results for 5 days — even a simple notes app works.
- Next 30 days: Review what worked, drop what didn’t, and build your personal system.
Last updated: 2026-03-16
About the Author
Written by the Rational Growth editorial team. Our health and psychology content is informed by peer-reviewed research, clinical guidelines, and real-world experience. We follow strict editorial standards and cite primary sources throughout.
References
- Bogle, J. C. (2017). The Little Book of Common Sense Investing. Wiley.
- Vanguard Research. (2019). Asset allocation and portfolio construction.
- Bernstein, W. J. (2010). The Investor’s Manifesto. Wiley.
Disclaimer: This article is for educational purposes only and does not constitute financial advice. Investment decisions should be made with the guidance of a qualified financial advisor.