Bonds & Interest Rates5 分钟阅读

The Bond Ladder (Laddering) Strategy

If no one knows whether rates will rise or fall now, when should you buy bonds? The way to make this hard question 'something you don't even need to get right' is the bond ladder.

What is a bond ladder

A bond ladder, or laddering, is a strategy of holding several bonds with different maturities, staggered like steps.

Instead of buying a lump of same-maturity bonds all at once, you spread maturities in layers—1 year, 2 years, 3 years, and so on. Each bond becomes one 'rung' of the ladder. The shortest maturity sits at the bottom, the longest at the top.

The core purpose is just one: to make it 'okay even if you can't predict when and how rates will change.'

Source: Charles Schwab (Bond Laddering), Wealthfront. A bond ladder is a strategy that spreads maturities to ease rate and reinvestment risk.

Rolling the ladder: how it works

For example, suppose you split about $7,400 into 10 rungs of about $740 each, in bonds maturing in 1 to 10 years.

After one year passes, the bottom 1-year bond matures and the principal comes back. You put this money into a new 10-year bond (the longest rung). Then the ladder rolls up one step at a time and keeps being maintained. Reinvesting this matured money into a new longest-maturity bond is called 'rolling the ladder.'

As a result, a fixed amount matures each year, and you reinvest that money at whatever rate prevails at the time.

Source: State Street, SmartAsset (bond ladder). Reinvesting the matured portion into a new longest-maturity bond is called rolling.

Why the risk decreases

Bond investing has two opposing worries.

One is rate risk. When rates rise, the prices of bonds you already hold fall. But because a ladder has only a portion mature each year, you can reinvest the matured money at the now-higher rate, so the shock is smoothed out.

The other is reinvestment risk. When rates fall, you have to reinvest matured money at lower rates. But the longer-term bonds higher up the ladder have already locked in the earlier, higher rates, so the overall shock is eased.

In other words, a ladder keeps you from leaning heavily to one side 'whether rates rise or fall,' easing the burden of predicting rates.

A ladder does not 'eliminate' risk; it 'smooths' it. The purpose is to make it so you don't have to call the direction of rates.

Advantages and limits

The ladder's advantages are clear. You don't have to predict rates, and matured money comes up each year, making it easy to secure cash when needed. It's a structure you can maintain comfortably over a long time.

But there are limits too. Because you have to buy several individual bonds, you need a certain amount of capital, and it takes effort to manage. Also, even if you build a ladder, the credit risk that the issuer fails to repay and the liquidity risk that it won't sell when you want to sell remain as-is.

What matters is that a ladder is not a 'technique for beating the market.' It's closer to a diversification tool that spreads risk evenly to make it easier to endure.

常见问题

Q. If I build a bond ladder, will I avoid losses?

No. A ladder only smooths the shock of rate changes; it doesn't eliminate losses. If an issuer defaults you can lose principal, and if you have to sell midway you can take a loss during a rising-rate period. It's a 'strategy that spreads risk evenly to make it easier to endure,' not a 'loss-free strategy.'

Q. How is it different from just holding one bond for a long time?

With a single maturity, everything hinges on the rate at that one point in time. A ladder, by contrast, has maturities scattered across years, so you blend good rates and bad rates evenly. Thanks to that, the burden of agonizing over 'is now the time to buy' decreases, and matured money comes up each year, boosting flexibility.