What it means
A CD ladder solves the awkward trade-off between yield and access. Longer certificates normally pay more but tie the money up, and a ladder gives you a share of that longer rate while still having a portion come free at predictable intervals.
The standard construction uses equal amounts across one, two, three, four and five year terms. As each certificate matures you reinvest it into a new five-year certificate, so after five years every rung is a five-year certificate and one still matures every twelve months.
Businesses apply the same idea to reserves that are not needed immediately, such as a deferred tax pot, a dilapidations fund or an insurance excess reserve. Treasury teams ladder short-dated government bills for identical reasons, and the logic is the same at any scale.
Laddering also spreads reinvestment risk, because you are never forced to roll the entire balance at whatever rate happens to prevail on a single day. If rates rise you capture them progressively, and if they fall you still hold older certificates at the higher rate.
Two limitations deserve attention. Breaking a rung early usually triggers an interest penalty, and when the yield curve inverts, short certificates can pay more than long ones, which temporarily removes the ladder's yield advantage.
In practice
Real-world examples.
Example
A charity holds a $200,000 operating reserve that its board insists must never be fully illiquid. It builds a four-rung ladder of $50,000 each maturing one to four years out, so $50,000 is always within a year of becoming available.
Example
A construction firm holds $180,000 of retention money it expects to release to subcontractors over three years. A three-rung ladder matches the maturities to the expected payment dates rather than leaving the cash earning nothing in a current account.
Example
A couple saving for their child's first year of tuition, due in five years, ladder $60,000 so that a rung matures each year from year one onwards. When one year brings an unexpected roof repair, they use the maturing rung instead of breaking a certificate and paying a penalty.
Formula
Calculation
Weighted average yield = sum of (amount in each rung x rung rate) / total amount invested
Annual interest = total amount invested x weighted average yield
An owner-managed business places $50,000 of reserve cash into a five-rung ladder of $10,000 each. The rates available are 4.0% for one year, 4.2% for two, 4.4% for three, 4.5% for four and 4.6% for five.
First-year interest by rung is $10,000 x 0.040 = $400, then $420, $440, $450 and $460, giving total interest of $2,170.
The weighted average yield is therefore $2,170 / $50,000 = 4.34%, which is also the simple average of the five rates because the rungs are equal in size.
Putting the whole $50,000 into a single one-year certificate would have earned $50,000 x 0.040 = $2,000. The ladder earns $2,170 - $2,000 = $170 more in the first year while still freeing $10,000 within twelve months.Case study
Seen in the real world.
Tidewater Dental Group is an illustrative three-practice business created for this entry. It had $250,000 sitting in a current account earning nothing while the partners debated whether to open a fourth site.
The practice manager built a five-rung ladder of $50,000 each at 4.0%, 4.2%, 4.4%, 4.5% and 4.6%. First-year interest came to $50,000 x 0.217 = $10,850, giving a weighted average yield of 4.34% against the zero the money had been earning.
Two years in, an autoclave failed and needed replacing at short notice. The maturing rung covered the $46,000 bill without any early withdrawal penalty, and the illustrative point the partners took away was that the ladder had cost them nothing in flexibility while adding roughly $10,000 a year of income.
Watch out
Common mistakes.
- Building a ladder with money that might be needed next month. A ladder frees cash at intervals, not on demand, so genuine day-to-day working capital belongs in an instant-access account.
- Ignoring the early withdrawal penalty. Breaking a five-year certificate can cost six to twelve months of interest, which easily erases the yield advantage.
- Spreading across so many small rungs that admin outweighs the benefit. Five rungs is usually plenty, and ten tiny certificates create work without meaningfully improving the return.
Questions
People also ask.
What happens when each certificate matures?
You normally reinvest it at the longest rung so the ladder keeps its shape, or take the cash if you need it that year.
Does a ladder work when rates are falling?
Yes, and arguably better, because your older long certificates keep paying the previous higher rates for years.
Should the rungs be equal in size?
Not necessarily; matching rung sizes to known future spending dates is often more useful than splitting evenly.
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