CD Ladder Calculator: Build a CD Ladder and Maximize Your Yield
Start from $20,000 across five CDs, put in the rates your bank is posting, and get the whole ladder at once — every maturity date, the interest each rung earns, and the blended APY you end up with.
Split evenly across the rungs — $4,000 each.
Five is the classic ladder. More rungs, longer top rung.
What you assume a maturing rung earns when you roll it into a new 5-year CD.
Blended APY across all 5 CDs
4.15%
$20,000 laddered · $2,587of interest if every rung is held to maturity · first $4,176 back in Aug 2027
Maturity Schedule
Edit any APY to match the quotes your bank is actually posting.
| Rung | Amount | APY | Matures | Interest | Value at Maturity |
|---|---|---|---|---|---|
| 1-year CD | $4,000 | % | Aug 2027 | $176 | $4,176 |
| 2-year CD | $4,000 | % | Aug 2028 | $343 | $4,343 |
| 3-year CD | $4,000 | % | Aug 2029 | $512 | $4,512 |
| 4-year CD | $4,000 | % | Aug 2030 | $688 | $4,688 |
| 5-year CD | $4,000 | % | Aug 2031 | $867 | $4,867 |
| Ladder | $20,000 | 4.15% | one rung a year | $2,587 | $22,587 |
Each rung compounds at its own APY for its own term, which is what the bank's quoted APY already accounts for. Blended APY is the dollar-weighted average of the rung rates — what the ladder as a whole earns per year. The default rates are illustrative placeholders, not quotes.
The Same $20,000, Three Ways
Where you stand in 5years, if today's rates hold and nothing is broken early.
The ladder
$24,394
Rungs rolled into new 5-year CDs at 4%
One 5-year CD
$24,333
Everything locked at 4% for 5 years
1-year CDs, rolled
$24,805
Renewed every 12 months at 4.4%
The ladder lands $61 ahead of the single 5-year CD here — and unlike that CD, it hands you $4,000 of principal back every 12 months with no penalty. The right-hand column is the one nobody can promise: rolling 1-year CDs only works out if short rates stay where they are.
In-flight CDs are counted at their accrued value at the 5-year mark. Cashing one out early instead would cost an early-withdrawal penalty.
What the ladder looks like once it's running
Roll each rung into a new 5-year CD as it matures and by Aug 2031 every rung is a 5-year CD, with one still coming due every 12 months. The first of those rolled CDs — today's 1-year rung, reinvested at 4% — matures in Aug 2032 at about $5,081. From there the ladder earns roughly the 5-year rate while you are never more than a year away from your next chunk of cash. That trade is the entire reason to build one.
What is a CD ladder?
A CD ladder is one pile of money split across several CDs that mature in different years. Each CD is a rung. The classic build is five equal rungs — a 1-year, a 2-year, a 3-year, a 4-year, and a 5-year CD, all opened on the same day.
The structure exists to solve one problem. Long CDs usually pay more than short ones, but locking every dollar away for five years is a bad idea for most people, and breaking a CD early costs months of interest. A ladder splits the difference: one rung matures every 12 months, so a fifth of your money is always within a year of being free, while the rest keeps earning the longer-term rates.
It also spreads out your rate risk. Instead of betting the whole balance on the rate available on one particular Tuesday, you reinvest a slice of it every year, into whatever the market is paying then. Rates rise and your next rung catches the rise; rates fall and four fifths of your money is still locked at the old, higher rates.
How to build a CD ladder, step by step
- 1
Decide the amount and the furthest date
Only money you can leave alone belongs in a ladder. Keep your emergency fund liquid, then ladder what's left over. The longest rung sets how far out you're committing — five years is standard, but a three-rung, three-year ladder is perfectly valid if that's your horizon.
- 2
Divide it into equal rungs
$20,000 across five rungs is $4,000 per CD. Equal rungs are the default because they make every future year's liquidity identical. Uneven rungs are fine too if you know one year needs more cash than the others — just remember which one.
- 3
Shop every term separately
This is where the yield actually comes from. Banks compete on different terms at different times, so the best 1-year rate and the best 5-year rate are almost never at the same institution. Online banks and credit unions generally post more than branch banks. Confirm FDIC or NCUA coverage on each one before you send money.
- 4
Open them all on the same day
Same-day openings keep the maturity dates exactly 12 months apart, which is the point of the structure. Record every maturity date in a calendar with a reminder two weeks ahead — that reminder is what protects you from automatic renewal at whatever rate the bank feels like posting.
- 5
Roll each maturing rung into a new long CD
When the 1-year matures, it buys a new 5-year CD. Next year the 2-year does the same. After one full cycle, every rung is a 5-year CD and one still matures every 12 months — you're earning long-term rates with annual access. If rates have fallen and you'd rather not commit, take that rung to a savings account instead and rebuild the rung later.
The one mistake to avoid: letting a rung auto-renew. Most banks roll a matured CD into a new term of the same length at whatever rate they happen to be posting, and that rate is often well below what you could get by moving the money. The grace period to act is short — commonly about a week to ten days. Set the calendar reminder when you open the CD, not later.
When to ladder vs. buy a single CD
A ladder is not automatically better. It costs you a little yield on the short rungs and gives you five accounts to track. Here is the honest split.
Ladder when…
- You want long-term rates but can't promise you won't need any of it for five years.
- You have no strong view on where rates go next — the ladder is the position that doesn't require one.
- The money has staggered jobs: some in two years, some in four.
- The balance is large enough that a penalty on the whole thing would really hurt. Breaking one rung costs a fraction of breaking one big CD.
Single CD when…
- The money has one known date — a closing in 18 months, a tuition bill in three years. Match the term to the date and stop there.
- You're confident rates are about to fall and long CDs are still paying well. Locking everything long is the aggressive version of the same bet.
- The amount is small. On $5,000, the blended-yield pickup over a savings account is a few dollars a month.
- You won't reliably track five maturity dates. A ladder you forget to roll is worse than one CD you remember.
There's a third answer worth naming: no CD at all. If the money might be needed on short notice, a high-yield savings account often pays close to the 1-year CD rate with none of the lockup — run that comparison in the CD vs. savings account calculator before you commit to any of this. And for money you won't touch for a decade or more, a CD ladder is the wrong tool entirely; a dividend reinvestment plan or a plain index fund compounds at a rate no CD will match, at the price of the guarantee.
Two variations worth knowing
The mini ladder.Same idea over months instead of years — 3-, 6-, 9-, and 12-month CDs. It suits cash with a horizon under a year, and it keeps something maturing every quarter. Set the calculator to four rungs and use your bank's short-term rates to see the shape, remembering the terms there are quarters rather than years.
The barbell.Half in very short CDs, half in the longest term, nothing in between. It pays more than a ladder when the rate curve is inverted — short rates above long ones — but it gives up the ladder's steady annual liquidity, and it's a bet on the curve rather than a hedge against it.
Whichever shape you pick, check the after-inflation number before deciding you've won. A 4% CD in a 3% inflation environment is a 1% real return before tax, and tax comes out of the 4%, not the 1%.
Related Tools & Articles
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All three homes for cash, compared over the same horizon
Inflation-Adjusted Returns
What your blended APY is really worth after inflation
APY vs. APR Calculator
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Emergency Fund Calculator
How much to keep liquid before any of it gets laddered
Frequently Asked Questions
What is a CD ladder?
A CD ladder is one pot of money split across several CDs with staggered maturity dates — classically five equal pieces in 1-, 2-, 3-, 4-, and 5-year CDs. Each CD is a rung. Because one rung matures every 12 months, you always have money coming free within a year, while the money on the upper rungs still earns the longer-term rates. It's a way to buy most of the yield of a long CD without accepting a single five-year lockup on everything you have.
How do I build a CD ladder step by step?
Decide how much to ladder and how far out you're willing to go. Divide that amount by the number of rungs. Shop each term separately — the best 1-year rate and the best 5-year rate are rarely at the same bank. Open all of the CDs on the same day so the maturity dates stay exactly 12 months apart. Then write down every maturity date, and when a rung matures, roll it into a new CD at the longest term in your ladder. After one full cycle every rung is a long-term CD, and one still matures each year.
What is a blended APY on a CD ladder?
It's the dollar-weighted average of the rates on your rungs — the rate the ladder as a whole is earning. With equal rungs it's just the average of the five APYs. It will sit below your best long-term rate and above your worst short-term one, which is the whole trade: you give up a little yield on the near rungs in exchange for getting that money back sooner.
Is a CD ladder better than one long CD?
Not on yield alone, usually. If long rates are the highest on the board and you truly won't touch the money, a single long CD wins by a hair. The ladder wins on everything else — it gives you a penalty-free exit every 12 months, and it spreads your reinvestment across five different rate environments instead of betting the entire balance on the rate available on one particular day. Run both numbers in the calculator above with your own rates and see how small the yield gap actually is.
How much money do you need to start a CD ladder?
Enough to clear each bank's minimum on every rung, which is commonly $500 to $1,000 per CD — so roughly $2,500 to $5,000 for a five-rung ladder. Some online banks have no minimum at all. Below about $10,000 the extra yield over a high-yield savings account is often a few dollars a month, and many people reasonably decide the admin isn't worth it.
What happens when a CD in the ladder matures?
The bank gives you a grace period — usually somewhere around a week to ten days, though it varies — to withdraw the money, add to it, or change the term. Miss that window and most banks automatically renew the CD at whatever they're currently posting for that term, which is frequently a below-market rate. Calendar every maturity date. Automatic renewal at a bad rate is the single most common way a ladder quietly stops working.
Do I pay taxes on CD interest before the CD matures?
Yes, on a multi-year CD. Interest is taxable in the year it's credited to the account, not the year you finally get your hands on it, and the bank reports it on a 1099-INT each year. It's taxed as ordinary income at your marginal rate, so a 4% CD in the 24% bracket nets you closer to 3%. That's also why CD ladders are common inside IRAs, where the annual tax disappears.
Can I break one rung of the ladder if I need cash?
You can, and paying the penalty on one rung is far cheaper than breaking a single CD holding the whole balance — that's a real, underrated benefit of laddering. Typical penalties run about 3 months of interest on a 1-year CD, 6 months on 2- to 4-year CDs, and up to 12 months on a 5-year CD. Break the rung with the least interest at stake, and leave the rest of the ladder alone.