What it means
A ladder is really just a maturity schedule dressed up with a name. Each holding is called a rung, the amount in each rung is normally the same, and the gap between rungs is the spacing you choose, most often one year but sometimes six months or two years.
The reason investors organise bonds this way is that it spreads two opposing risks. Holding only short maturities means your income is re-priced constantly and falls whenever rates drop, while holding only long maturities locks you in if rates rise and leaves you selling at a loss to raise cash.
A ladder always has something maturing soon and something still earning the higher long rate. For a business, the appeal is usually cash matching rather than clever positioning.
A finance team that knows it owes a $400,000 earn-out in three years and a $250,000 lease deposit in five can place rungs that mature on those dates, removing the need to sell anything early. Building a ladder takes three decisions: how much money in total, how far out the longest rung should sit, and how wide the spacing should be.
Divide the total by the number of rungs, buy one bond for each maturity date, then reinvest each maturing rung at the far end so the ladder keeps its shape. There are two common cousins worth recognising.
A barbell concentrates money at the very short and very long ends with nothing in the middle, and a bullet puts everything at one maturity, so a ladder sits between them in both risk and simplicity. One nuance catches people out: callable bonds can collapse a ladder.
If several rungs are called early because rates have fallen, you end up reinvesting far more than you planned at exactly the moment yields are least attractive.
In practice
Real-world examples.
Example
A dental practice sells its second surgery and holds $600,000 it will not need for several years. The practice manager builds a six-rung ladder of $100,000 each, spaced a year apart, so there is always a maturity within twelve months if an unexpected equipment bill lands.
Example
A charity with a $1,200,000 reserve fund is required by its trustees to keep money accessible without selling at a loss. It ladders the reserve across six annual rungs of $200,000 in high grade government and corporate bonds, which satisfies the policy while earning more than a deposit account.
Example
A manufacturing group is holding cash for three contracted milestone payments over the next four years. Rather than a neat even ladder, it sizes each rung to the exact payment due, which is a ladder shaped by the liability schedule instead of by symmetry.
Formula
Calculation
Amount per rung = total investment / number of rungs
Annual income = sum of (amount per rung x yield of that rung)
A company places $500,000 into a five-rung ladder, so each rung is $500,000 / 5 = $100,000. The rungs are bought at yields of 3.0%, 3.4%, 3.8%, 4.2% and 4.6% for maturities of one through five years.
The income from each rung is $100,000 x 3.0% = $3,000, then $3,400, $3,800, $4,200 and $4,600. Adding those gives $3,000 + $3,400 + $3,800 + $4,200 + $4,600 = $19,000 of annual interest, which is an average yield of $19,000 / $500,000 = 3.8%.
When the one-year rung matures, the $100,000 is reinvested into a new five-year bond, and every other rung has moved one year closer to maturity. The ladder keeps its five-rung shape indefinitely without the treasurer ever having to guess where rates are heading.Case study
Seen in the real world.
The following is an illustrative and entirely fictional example. Harbourline Cabinetry, an invented joinery business, sold a warehouse and was left with $750,000 that the owners wanted kept safe but working. Their first instinct was one five-year bond at 3.5%, which would have paid $750,000 x 3.5% = $26,250 a year and locked every dollar away until maturity.
Their accountant suggested a ladder instead: five rungs of $750,000 / 5 = $150,000, maturing one year apart. In the first year the ladder produced slightly less income than the single long bond, because the shorter rungs paid lower rates, and the owners grumbled about it.
Two years later market yields had risen sharply. The maturing rung was reinvested at 5.2%, producing $150,000 x 5.2% = $7,800 a year instead of the $150,000 x 3.5% = $5,250 it had been earning, a gain of $2,550 on that rung alone. The fictional business had not predicted anything; the ladder simply gave it a scheduled chance to reprice one fifth of the portfolio every year.
Watch out
Common mistakes.
- Assuming a ladder protects against default risk. It spreads timing risk, not credit risk, so five rungs of bonds from the same shaky issuer is still a concentrated bet.
- Filling the ladder with callable bonds without checking the call dates, which lets the issuer dismantle the structure precisely when rates have fallen.
- Buying bond funds and calling it a ladder. An ordinary bond fund has no fixed maturity date, so it never hands back a defined sum on a defined day.
Questions
People also ask.
How many rungs should a ladder have?
Five to ten is typical, because fewer than five leaves large gaps between maturities and more than ten creates small holdings that cost more to buy and monitor.
Does laddering beat simply timing the market?
It is not designed to. A ladder gives up the chance of a perfectly timed purchase in exchange for never being entirely wrong about the direction of rates.
What happens if I need the money before a rung matures?
You can sell a bond in the secondary market, but the price depends on where rates have moved, so early sale reintroduces exactly the risk the ladder was built to reduce.
From the founder's library
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