CD Ladder, Explained: Locking In Rates Without Locking Up Your Money
By the Stoia team · September 7, 2026 · 5 min read
$25,000 in a savings account earns whatever the bank decides to pay this month, and the bank can lower it tomorrow. The same $25,000 in a five-year CD earns a rate that cannot be cut, and cannot be touched without a penalty until the term ends. A ladder is the arrangement that captures most of the second deal while keeping most of the first one's access, and it takes about an hour to set up.
The problem a ladder solves
A certificate of deposit trades access for certainty: you agree to leave the money for a fixed term and the bank agrees to a fixed rate. Longer terms usually pay more, though not always, and the price of the higher rate is liquidity: pull the money early and you forfeit months of interest. A savings account is the mirror image, fully liquid and fully variable. Putting everything in one bucket means choosing between rate risk and access risk. A ladder splits the money across several terms so that some of it is always close to maturing, which shrinks both risks at once.
Building a five-rung ladder
The classic version divides the money into five equal pieces and buys CDs maturing in one, two, three, four, and five years. Here is $25,000 laddered that way, using illustrative rates rather than a quote from any given week, with interest compounded annually to keep the arithmetic visible:
| Rung | Amount | Term | Rate (illustrative) | Value at maturity | Interest earned |
|---|---|---|---|---|---|
| 1 | $5,000 | 1 year | 4.00% | $5,200 | $200 |
| 2 | $5,000 | 2 years | 4.10% | $5,418 | $418 |
| 3 | $5,000 | 3 years | 4.25% | $5,665 | $665 |
| 4 | $5,000 | 4 years | 4.40% | $5,940 | $940 |
| 5 | $5,000 | 5 years | 4.50% | $6,231 | $1,231 |
On day one the ladder earns a blended 4.25%, and $5,000 of it is never more than twelve months from being fully available with no penalty. Every rung is a separate account, which also means every rung can live at whichever institution pays best for that term. The CD calculator prices any single rung at the rate and compounding your bank actually offers. The CD ladder calculator lays out every rung at once, with the first maturity and the blended yield.
Rolling the rungs
The ladder becomes a machine at the first maturity. When rung one pays out at the end of year one, you buy a new five-year CD with it, maturing in year six. When rung two pays out at year two, it becomes a five-year CD maturing in year seven. After four rollovers, all $25,000 sits in five-year CDs, still with one maturing every year. The blended rate drifts from 4.25% up toward the five-year rate, the highest on a normal curve, without ever giving up the annual window of access. The ladder also averages out rate changes for you: if rates rise, the next rung catches the higher number within a year; if they fall, 80% of the money is already locked at the old rate. Each maturity is a decision point rather than a default, so the money can be rolled, spent, or moved somewhere better depending on what that year looks like.
When a ladder beats a savings account
The case for the ladder is strongest when three things line up. Rates on CDs sit meaningfully above savings rates. You expect rates to fall, so locking in has value. And the money has a horizon you can name, such as a down payment in three years or tuition due in installments, where rungs can be matched to the dates. On the example numbers, a savings account paying 3.5% earns $875 on $25,000 in year one against the ladder's $1,062, a $188 difference. The dollars are modest at this size; the rate lock and the discipline of money that is slightly hard to reach are usually the bigger benefits. The HYSA calculator shows what the liquid alternative earns at any rate so you can see the gap on your own balance.
When it does not
- An emergency fund needs to be entirely available on the worst day, not 20% of it. That money belongs in a liquid account, and the ladder is for savings beyond your emergency fund.
- A flat or inverted curve, where a one-year CD or even a savings account pays as much as a five-year, turns the ladder into a way of locking in worse rates for longer.
- Rising rates make every long rung look worse the month after you buy it. The ladder limits the damage, but a shorter ladder or a savings account limits it more.
- Small balances, where half a point of extra yield on $5,000 is $25 a year, rarely justify five accounts and five maturity dates.
- A lump sum due on a known day soon, such as a closing in eight months, wants a single CD matched to that date or a savings account, not a ladder.
Early withdrawal penalties, in words
Breaking a CD early usually costs a set number of months of interest: a few months on short terms, up to a year or more on long ones. If you withdraw before that much interest has accrued, the penalty comes out of your principal, so a five-year CD broken in month two can return less than you deposited. Some banks do not allow partial withdrawals at all. The ladder is the main defense, because something is always maturing within a year, but two variations soften it further: no-penalty CDs, which pay a slightly lower rate for the right to leave early, and brokered CDs, which are sold on a secondary market instead of surrendered, at a price that can be below face value if rates have risen. Whatever the structure, keep each institution within the insured limit so the principal is covered by deposit insurance, because a ladder spread across several banks is easy to lose track of.
Each rung is a dated goal with a known payout, and that is how it is easiest to manage: five maturities on a calendar, each tied to what the money is for. Goals in Stoia can hold every rung with its date, so the next maturity is never a surprise and the money is never rolled over by default.