How Many Rungs Should a Bond Ladder Have?
There’s no fixed rule for how many maturities belong in a bond ladder. The right number tends to depend on how much money is involved, how often cash is needed, and how much complexity feels manageable.
The short answer
There’s no single correct number of rungs for a bond ladder — the choice depends on the total amount being invested, how frequently cash flow or reinvestment opportunities are wanted, and how much ongoing management feels worthwhile. More rungs generally smooth out interest rate exposure and reinvestment timing further, while fewer rungs keep the structure simpler to build and track.
What more rungs offer
A ladder with more rungs — say, ten annual maturities instead of five — spreads reinvestment risk across more individual points in time. Instead of a fifth of the portfolio maturing and needing reinvestment each year, only a tenth does, which further reduces how much any single year’s rate environment affects the overall structure. More rungs can also mean more frequent access to at least some cash, since a maturity is coming due more often.
What fewer rungs offer
A simpler ladder with fewer rungs is easier to build and track, particularly when the total amount invested isn’t large enough to divide meaningfully across ten or more separate bonds without each position becoming quite small. Transaction costs and minimum purchase amounts on individual bonds can also make a smaller number of larger rungs more practical than a larger number of small ones.
Factors that typically shape the decision
- Total capital available. Dividing a modest amount across too many rungs can leave each position too small to be efficient.
- How often cash is needed. A need for annual liquidity points toward more, closely spaced rungs; a longer-term goal with no near-term cash need may call for fewer.
- Appetite for ongoing management. Each rung is a bond that eventually needs rolling, so more rungs mean more periodic decisions over time.
- Desired smoothness of rate exposure. More rungs spread reinvestment risk more finely across time; fewer rungs concentrate it into larger, less frequent decisions.
A middle-ground approach
Many people building a bond ladder settle somewhere in the middle — often five to ten rungs — balancing meaningful diversification of maturities against the practicality of managing and funding each one. There’s no rule requiring symmetry either; rungs don’t need to be spaced exactly one year apart, and some ladders use two-year or other intervals depending on the underlying goal.
Applying the same logic to CDs
The same trade-off applies to a CD ladder built with certificates of deposit instead of bonds: more rungs mean smoother, more frequent reinvestment opportunities, while fewer rungs mean simpler tracking with larger, less frequent maturities. The underlying decision — how finely to slice the total amount across time — is the same regardless of which instrument is used to build the ladder.
What to weigh
Choosing the number of rungs comes down to matching the ladder’s granularity to the goal it’s meant to serve, the amount of money involved, and how much ongoing attention feels sustainable. There’s no universally right number, only trade-offs between simplicity and finer control over timing.