How Do You Roll a Bond Ladder?
A bond ladder doesn’t maintain itself. Once the first rung matures, a decision has to be made about what happens to that money — and repeating that decision well is what keeps the ladder a ladder.
The short answer
Rolling a bond ladder means taking the proceeds from a matured bond, the “rung” that’s just come due, and reinvesting them in a new bond at the long end of the ladder, restoring the structure’s original staggered maturity pattern. Done consistently, rolling keeps a bond ladder functioning as a ladder indefinitely instead of gradually collapsing into a single maturity date.
Why rolling is necessary
A ladder is defined by having bonds mature at regular intervals — say, every year for five years. Left alone, each rung simply matures and disappears, and after five years the entire ladder would be gone, with no new bonds maturing on schedule after that. Rolling is what prevents that: reinvesting each matured rung’s proceeds into a new, longer-dated bond keeps a bond maturing every year going forward, rather than the ladder shrinking down to nothing over time.
How the mechanics typically work
When the shortest-maturity bond in a ladder comes due, its proceeds — principal plus any final interest — become available. Those proceeds are then used to purchase a new bond maturing at the current long end of the ladder. In a five-year ladder, for example, when the one-year bond matures, the proceeds might go toward a new five-year bond, which becomes the new longest rung while the bonds that were previously two, three, four, and five years out have each moved one year closer to their own maturities.
What to keep in mind when rolling
- Reinvestment happens at current rates. Whatever rates are available at the time of rolling determine the yield on the new rung, which is the entire point of a ladder: no single rate environment determines the whole portfolio.
- Consistency matters more than timing precision. Rolling doesn’t need to happen the instant a bond matures, but delaying it for long stretches can leave cash sitting idle instead of working within the ladder structure.
- The ladder’s shape stays the same. As long as each matured rung is replaced at the long end, the ladder maintains its original span of maturities year after year.
Adjusting the approach over time
Rolling doesn’t have to be mechanical forever. An investor’s circumstances can change — a need for more liquidity, a shift in how many maturities to hold, or a decision to stop reinvesting and start spending down the ladder instead. Deciding how many rungs a ladder should have is worth revisiting periodically, since a ladder built for one purpose years ago may not fit a different purpose today.
A practical habit
Some investors treat rolling as a routine check-in: reviewing current rates, confirming the new bond purchased matches the ladder’s intended long-end maturity, and considering yield to maturity on available replacement bonds before committing. Treating it as a habit, rather than an afterthought, is generally what keeps a ladder’s structure intact over the long run, similar to how a CD ladder needs the same ongoing attention when certificates mature.