Nobody has ever gone to a party and said, "You'll never guess what happened with my bond allocation this year." Bonds don't go viral. Bonds don't have Reddit communities with rocket emojis and diamond-hand memes. Bonds don't make you feel like a financial genius at Thanksgiving dinner.
Bonds are the un-sexy, slightly-too-sensible friend who never does anything interesting — until the world falls apart, and suddenly that friend is the most important person you know.
That's bonds. Boring by design. Essential by function. Misunderstood by almost everyone.
What Bonds Actually Do (It's Not What You Think)
Most people think of bonds as the "safe" part of a portfolio — the low-return alternative for people who are too scared of stocks. That framing is wrong in two ways.
First, bonds aren't perfectly safe. Long-term Treasury bonds lost roughly 30% of their value in 2022 as interest rates surged — a worse decline than many stock bear markets. Short-term bonds fared much better. Bond volatility is real.
Second, bonds aren't primarily about generating returns. They're about managing the behavioral risk of a pure equity portfolio. Here's the real job description of bonds in your portfolio:
To keep you from panic-selling your stocks.
That sounds almost insultingly simple. But it's the core function, and it's enormously valuable. When the market drops 40%, a portfolio with 20% bonds drops significantly less than a 100% equity portfolio. That smaller drop means you're less likely to look at your account balance, feel sick, and hit the sell button. And as we've covered elsewhere on this blog, panic-selling is the single most expensive mistake you can make as an investor.
The classic 60/40 portfolio (60% stocks, 40% bonds) exists precisely because empirical research shows that most investors cannot emotionally handle a pure equity portfolio through major bear markets. The bonds aren't there to maximize returns — they're there to keep you in the game when your lizard brain is screaming at you to get out.
The Age-Based Allocation Question
How much should you hold in bonds? The most famous rule of thumb is the "100 minus your age" formula: subtract your age from 100 to get your stock allocation percentage, with the remainder in bonds.
- Age 25: 75% stocks, 25% bonds
- Age 50: 50% stocks, 50% bonds
- Age 70: 30% stocks, 70% bonds
This rule has the virtue of being simple and automatically shifting you toward more conservative allocations as you age — which is logical, since you have less time to recover from a major market downturn.
But the rule is showing its age. It was developed in an era of higher bond yields and shorter life expectancies. With people living to 85-90 routinely, a 70-year-old retiree might have a 20+ year time horizon. Putting 70% in bonds at 70 may leave you too conservative for that timeline.
Modern financial planning has updated the formula to "110 minus your age" or even "120 minus your age" for healthier, longer-lived investors:
| Rule | Age 30 | Age 55 | Age 70 |
|---|---|---|---|
| 100 minus age (classic) | 70% stocks / 30% bonds | 45% stocks / 55% bonds | 30% stocks / 70% bonds |
| 110 minus age (updated) | 80% stocks / 20% bonds | 55% stocks / 45% bonds | 40% stocks / 60% bonds |
| 120 minus age (aggressive) | 90% stocks / 10% bonds | 65% stocks / 35% bonds | 50% stocks / 50% bonds |
The VTI & Chill philosophy: if you're under 40, you probably need minimal bond allocation (0-15%). Your time horizon is long enough that equity volatility is your friend — you're buying more shares at lower prices during downturns. As you approach 50 and beyond, gradually increasing your bond allocation to 20-30% provides a psychological cushion and actual portfolio stability when you can't afford major drawdowns.
Which Bonds? A Quick Tour
Not all bonds are created equal. The main options for index investors:
BND (Vanguard Total Bond Market ETF) — 0.03% expense ratio. The bond equivalent of VTI: holds essentially the entire investment-grade US bond market. A mix of government bonds, corporate bonds, and mortgage-backed securities. This is the bond fund most Bogleheads reach for first, and for good reason — it's extremely cheap, highly diversified, and liquid. Average duration of around 6 years.
AVIG (Avantis Core Fixed Income ETF) — 0.15% expense ratio. Avantis's bond offering uses their factor methodology to tilt toward bonds with characteristics associated with higher expected returns (higher yield, shorter duration). For investors who are already using Avantis equity ETFs and want a consistent philosophy throughout their portfolio.
Treasury Inflation-Protected Securities (TIPS): TIPS adjust their principal value with inflation, making them genuine inflation hedges in a way that nominal bonds are not. Available through VTIP (Vanguard Short-Term TIPS ETF, 0.04%) or similar funds.
Paul Merriman's bond recommendation for the fixed income portion skews shorter-duration than BND: approximately 50% intermediate-term Treasuries, 30% short-term Treasuries, 20% short-term TIPS. This specifically avoids the duration risk that burned long-bond holders in 2022.
The 2022 Bond Disaster: A Lesson in Duration Risk
Let's address the elephant in the room: bonds were brutal in 2022.
As the Federal Reserve raised interest rates at the fastest pace in decades to fight inflation, bond prices fell sharply — and long-duration bonds fell the most. The Bloomberg US Aggregate Bond Index dropped roughly 13% in 2022, its worst year since the index's inception. Long-term Treasury funds lost 30% or more.
The lesson isn't that bonds are bad. It's that bond duration matters enormously. When interest rates rise, the prices of long-term bonds fall much more than short-term bonds. A short-term bond might drop 3-5% in a rate spike; a 30-year Treasury might drop 25-30%.
Duration risk: the concept every bond investor needs
Duration measures a bond's sensitivity to interest rate changes. A bond with a duration of 5 years will lose approximately 5% of its value for every 1 percentage point rise in interest rates. BND has an average duration of around 6 years — manageable. A long-term Treasury ETF might have a duration of 20+ years, meaning a 2-percentage-point rate hike (which happened in 2022) could cause a 40%+ loss. For individual investors, this argues for keeping bond durations moderate. If you're particularly concerned about inflation and rate risk, short-term bond funds or TIPS provide more stability than a total bond market fund.
The Behavioral Case: One More Time
We keep returning to the behavioral argument because it matters more than the return math.
A Vanguard study of investors during the 2008-2009 financial crisis found that those who held a traditional balanced portfolio (with bonds) were far less likely to panic-sell than those with all-equity portfolios. The smaller drawdown wasn't just about losing less money in the moment — it was about staying invested through the recovery.
The S&P 500 bottomed in March 2009 and went on to deliver one of the greatest bull markets in history. Investors who bailed at or near the bottom missed most of that recovery. Their bonds — boring, returns-dampening bonds — were the thing that kept them from making the worst financial decision of their lives.
A 100% equity portfolio theoretically maximizes your expected return. A portfolio you panic-sell at the worst moment delivers zero expected return on the portion you sold. Bonds are portfolio insurance against your own worst instincts.
The Bottom Line
Bonds are boring. That's not a bug — it's the product description. They exist to dampen volatility, reduce drawdowns, and keep you emotionally invested in your portfolio when markets get terrifying. The best thing bonds do is prevent you from doing something stupid with your stocks.
Your bond allocation should grow as you age: minimal in your 20s and 30s, moderate in your 40s and 50s, meaningful (though probably not dominant) in retirement. BND is the simplest vehicle at 0.03% expense ratio. AVIG works well if you're an Avantis investor throughout. Keep durations moderate — the 2022 rate cycle showed exactly what long-duration bond exposure can cost.
The service bonds provide — keeping you in the game through panics — is worth whatever return you give up by holding them. That's not a small thing. That's the entire game.
Disclaimer: VTI & Chill provides financial EDUCATION, not personalized financial ADVICE. We are not licensed financial advisors. All content is for informational and educational purposes only. Past performance does not guarantee future results. Always do your own research and consider consulting a qualified financial professional before making investment decisions. All investing involves risk, including the possible loss of principal.