What it means
Building a ladder means splitting the money into equal slices and buying bonds maturing in one year, two years, three years and so on out to the chosen horizon. Every year one rung matures, providing predictable cash without anyone having to sell a holding at whatever price the market happens to offer.
The business case is control over timing. A company that knows it must fund an equipment replacement in three years and a lease deposit in five can shape the rungs around those dates, rather than hoping a bond fund will be at a decent price on the day the money is needed.
Ladders also soften interest rate risk without predicting rates. If yields rise, the maturing rung is reinvested at the new higher rate; if yields fall, the longer rungs bought earlier are still paying their old, better coupons.
The main variables are the ladder's length and the spacing between rungs. A five-year ladder with annual rungs is common for corporate reserves, while a longer ladder with rungs every two years suits investors who value income over access to cash.
Two variants are worth knowing. A barbell puts money at the very short and very long ends with nothing in the middle, and a bullet concentrates every bond on one target date, both of which behave quite differently from an evenly spread ladder.
In practice
Real-world examples.
Example
A family-owned printing business holds $750,000 of reserves in a three-year ladder with rungs every six months. The owner uses each maturing rung to cover press maintenance, avoiding both an overdraft and the need to sell investments at short notice.
Example
A retired consultant builds a ten-rung ladder of government bonds sized to cover his annual living costs for a decade. Market prices swing considerably over that period, but because he never sells before maturity, the swings never affect the cash he actually receives.
Example
A property developer wins a planning consent that pushes a build start back by a year. Because the funds sit in a ladder rather than a single dated bond, she simply reinvests the maturing rung for another year rather than restructuring the whole portfolio.
Think of it
“Bond ladder is spreading maturities over time-reinvesting as each bond matures.
Formula
Calculation
Amount per rung = total investment / number of rungs
Annual interest income = sum of (rung amount x each rung's yield)
Portfolio yield = annual interest income / total investment
A professional services firm invests $500,000 of surplus cash in a five-rung ladder, so each rung is $500,000 / 5 = $100,000. The bonds it buys yield 3.0% at one year, 3.4% at two years, 3.8% at three years, 4.2% at four years and 4.6% at five years.
Annual income is ($100,000 x 3.0%) + ($100,000 x 3.4%) + ($100,000 x 3.8%) + ($100,000 x 4.2%) + ($100,000 x 4.6%) = $3,000 + $3,400 + $3,800 + $4,200 + $4,600 = $19,000. The portfolio yield is $19,000 / $500,000 = 3.8%, which is well above the 3.0% available on one-year money while still returning $100,000 of cash every twelve months.
When the first rung matures, the $100,000 is reinvested at the far end into a new five-year bond, and the ladder rolls on with the same shape.Case study
Seen in the real world.
This is an illustrative and clearly fictional example. Thornbury Instruments, an invented scientific equipment maker, kept its $2,000,000 of surplus cash entirely in three-month deposits because the finance director wanted instant access. The policy was safe but the income was thin, and the board queried why reserves were earning so little.
The fictional company moved to a four-rung ladder of $500,000 each maturing at one, two, three and four years, keeping only two months of operating costs in the bank. Income roughly doubled, and because a rung matured every year the business retained a predictable route back to cash.
When an unexpected export order required a $400,000 outlay in month seven, Thornbury's imagined treasurer used the operating buffer plus a short overdraft for five months rather than breaking the ladder. The episode led the company to size its cash buffer against the gap between rungs, which is the discipline a ladder demands.
Watch out
Common mistakes.
- Building a ladder with every rung from a single issuer, which concentrates credit risk even though the maturities are spread out.
- Leaving no cash buffer outside the ladder, so any unexpected cost forces an early sale at market prices.
- Failing to reinvest a maturing rung promptly, which quietly shortens the ladder and lowers the portfolio yield each year.
Questions
People also ask.
Does a ladder protect against rising interest rates?
Partly, because each maturing rung is reinvested at the new higher rate, though the longer rungs still fall in market value in the meantime.
How many rungs are sensible?
Enough to match the cash needs of the business, with five annual rungs a common starting point for corporate reserves.
Can a ladder be built with bond funds instead of individual bonds?
Only with target maturity funds that wind up on a set date, since ordinary bond funds never mature.
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