Bonds: how they work and why you should care

Bonds are loans. You lend money to a government or a company; they promise to pay you interest on a schedule and return the principal at a specified date. In exchange for giving up ownership upside, you get predictable income and lower volatility. Bonds are less sexy than stocks, less popular than stocks, and mathematically necessary for almost every balanced portfolio.

The main types

• US Treasuries: the safest bonds in the world, effectively zero default risk. Short-term (bills), medium (notes), long-term (bonds) versions.
• Municipal bonds: issued by states and local governments. Interest is usually federal-tax-free, often state-tax-free too for residents. Good for high earners in high-tax states.
• Corporate bonds: issued by companies. Higher yields than Treasuries, with varying default risk by company.
• High-yield (junk) bonds: lowest-rated corporate bonds with the highest yields. Riskier than stocks in some ways; they can correlate strongly with equity drawdowns.
• Inflation-protected bonds (TIPS, I-bonds): principal adjusts with inflation. Not a perfect hedge but useful for preserving real purchasing power.

The key mechanic: rates and prices move inversely

This is the single most confusing thing about bonds. When interest rates go up, existing bond prices go down. When rates go down, existing bond prices go up. This is why 'safe' bond funds can lose 10%+ in rising-rate environments — the bonds they hold are less valuable compared to newly-issued higher-yielding alternatives.

Why hold them at all

Bonds reduce overall portfolio volatility, they provide income during retirement, and historically they've held up or gained value during stock market crashes. The goal of bonds in a portfolio isn't to grow wealth aggressively — it's to reduce the pain of drawdowns so you don't panic-sell your stocks at the bottom. That psychological value is worth real return.