CD Ladder Calculator
Savings & BankingSpread CDs across staggered maturities.
Ladder setup
Advanced options
What builds the ending value
- Deposit$100,000
- Interest$61,343
Figures are estimates for planning only. Real CD yields, terms, minimums and early-withdrawal penalties vary by bank, and the rates you reinvest at will differ from today's. Not financial advice.
Ladder vs a single CD
All three hold the same deposit over 10 yr.
- CD ladder$161,343
- One long CD$162,889
- Rolling short CD$148,024
The ladder is worth $161,343 — $13,319 more than rolling the shortest-rung CD and $1,546 less than locking the whole sum in the longest CD, with a rung freeing up every 1 yr.
That captures 90% of the long CD's yield premium while keeping the ladder's regular access.
Maturity cash flow
Principal and interest coming due on each maturity date.
Maturity schedule
Every rung, its term and the value it reaches — plus each rollover when reinvesting.
| Rung | Term | APY | Principal | Interest | Maturity value |
|---|---|---|---|---|---|
| 1 | 1 yr | 4% | $20,000 | $800 | $20,800 |
| 2 | 2 yr | 4.25% | $20,000 | $1,736 | $21,736 |
| 3 | 3 yr | 4.5% | $20,000 | $2,823 | $22,823 |
| 4 | 4 yr | 4.75% | $20,000 | $4,079 | $24,079 |
| 5 | 5 yr | 5% | $20,000 | $5,526 | $25,526 |
Save & compare ladders
Store a ladder and line up alternatives side by side.
How this ladder works
- Your $100,000 is split into 5 equal rungs of $20,000 each, so a rung comes due every 1 yr.
- Terms run from 1 yr up to 5 yr, and together the rungs average 4.5% APY.
- As each rung matures it rolls into a fresh longest CD at 5%, repeating for 10 years.
- The ladder ends at $161,343 — $61,343 of interest, a realized 4.9% yield.
- Set against the alternatives over the same window, the ladder lands between a single long CD and a rolling short CD — the classic trade of a little yield for regular access.
Know what this estimate is based on
- Jurisdiction
- General mathematical model
- Scope and limitations
- Projection only. Actual APY, posting dates, compounding, taxes, withdrawal rules, deposit protection, and fees depend on the financial institution and country.
- Source links checked
- Jul 30, 2026
Built and regression-tested by Smart Tools Lab. It has not been individually reviewed by a licensed financial, tax, or legal professional.
How to use
- 01
Enter the total amount you want to invest — 100,000 in the default — which the calculator splits equally across the rungs, so five rungs each hold 20,000.
- 02
Choose how many rungs to build and the spacing between maturities. With five rungs and one-year spacing, the terms run from a one-year CD up to a five-year CD, one maturing each year.
- 03
Set the yield for each rung. Longer CDs usually pay more, so the default curve climbs from 4% on the one-year rung to 5% on the five-year; press Even curve to auto-fill a rising ladder, or switch to APR and pick a compounding frequency if your bank quotes a nominal rate.
- 04
Decide what happens at each maturity: reinvest the proceeds into a fresh longest-term CD to keep the ladder rolling, or hold every rung to maturity and take the cash. When reinvesting, set how many years to project — ten in the default.
- 05
Open advanced options to add a marginal tax rate on interest, an inflation rate for the today's-money view, and a rate shift applied to reinvested CDs so you can test a rising or falling rate environment.
- 06
Read the ladder's value at the horizon, the total interest, the weighted-average and realized yields, the maturity schedule with each rollover, and how the ladder stacks up against a single long CD and a rolling short CD.
Formula
The deposit is divided equally among the rungs, so each rung starts with the deposit divided by the number of rungs. Rung number i is given a term of i spacing intervals and its own yield. That yield is turned into an effective annual rate: an APY is already effective, while an APR is compounded the chosen number of times a year, one plus the nominal rate over the frequency, raised to the frequency, minus one. A rung left to its own maturity grows to its principal times one plus the effective rate, raised to the term in years, and the interest is that maturity value minus the principal. The calculator then runs the whole ladder forward on a grid of maturity dates. Whenever a CD matures it pays principal plus interest; if reinvestment is on, those proceeds open a new CD at the longest term and the top rung's rate (optionally shifted for a changed rate environment), so the ladder reaches a steady state where one CD comes due every interval. If reinvestment is off, the proceeds are simply held as cash. The value at the end of the horizon marks every CD still open to its accrued worth — principal times one plus its rate, raised to the years elapsed — and adds any cash from matured rungs. Total interest is that ending value minus the original deposit. The weighted-average APY is the deposit-weighted mean of the rung yields, which for equal rungs is their simple average; the realized yield is the compound annual growth of the whole ladder, the ending value over the deposit raised to one over the horizon, minus one. Tax is the marginal rate applied to total interest, assumed paid from outside the ladder so it never slows the compounding, and the real value discounts the ending figure by inflation over the horizon. Two single-CD benchmarks value the entire deposit over the same horizon: a long CD at the top rung's rate and a rolling short CD at the shortest rung's rate.
Example
Take the defaults. You have 100,000 to invest and split it into five equal rungs of 20,000 each. With one-year spacing the rungs run one through five years, and the yields climb along a gentle curve — 4% on the one-year, 4.25%, 4.5%, 4.75% and 5% on the five-year — averaging 4.5%. Each rung grows to its own maturity value: the one-year 20,000 reaches 20,800, the two-year 21,736, the three-year 22,823, the four-year 24,079 and the five-year 25,526. Because reinvestment is switched on, every rung that comes due rolls into a fresh five-year CD at the 5% top rate, and the ladder keeps rolling across a ten-year horizon. Marking every certificate at year ten — reinvested cash back at work, still-open CDs at their accrued value — the ladder is worth about 161,343, of which 61,343 is interest. That is a realized yield of roughly 4.9% a year, higher than the 4.5% average rung rate because every reinvested rung earns the 5% top rate for its whole life, pulling the blend upward. Now the comparison over the same ten years. Lock the whole 100,000 in a single 5% CD and keep rolling it, and you would hold about 162,889 — just 1,546 more — but with nothing accessible until year five. Roll it all instead in one-year 4% CDs and you would have full annual access but only about 148,024. The ladder lands between the two: it earns about 13,319 more than the rolling short CD while handing you the same yearly access, capturing close to 90% of the long CD's yield advantage. With inflation set to 3%, the 161,343 is worth about 120,054 in today's money. Every number is an estimate that holds the rates steady for the full horizon; the rates you actually reinvest at years from now will differ.
Definitions
- CD ladder
- A set of certificates of deposit bought at once but with staggered terms, so one matures on a regular cadence. It blends the higher yields of longer CDs with the regular access of shorter ones. The default splits 100,000 across five rungs maturing a year apart.
- Rung
- One CD within the ladder. Each rung holds an equal share of the deposit — 20,000 of the 100,000 here — and carries its own term and yield, with rung one the shortest and rung five the longest.
- Maturity spacing
- The gap between successive maturities, one year in the default. It sets both the terms — rung i matures after i intervals — and how often a slice of cash frees up, so tighter spacing means more frequent access.
- Term
- How long a CD is locked before it matures. In the default ladder the terms run one, two, three, four and five years; a longer term usually earns a higher rate but ties the money up for longer.
- APY (annual percentage yield)
- The effective yearly rate on a CD once its own compounding is counted, and the figure banks advertise. Enter it directly, or switch to APR and give a compounding frequency and the tool converts it for you.
- Weighted-average APY
- The deposit-weighted mean of the rungs' yields, which for equal rungs is just their average — 4.5% in the default. It describes the blend of rates you hold, not the growth the ladder actually realizes.
- Realized yield
- The compound annual growth of the whole ladder over the horizon — about 4.9% in the default. It can beat the weighted-average APY when maturing rungs reinvest at the higher top rate.
- Reinvestment (rollover)
- Rolling a maturing rung's proceeds into a new longest-term CD instead of taking the cash. It keeps the ladder at full length and pushes the realized yield up, at the cost of putting the money back to work rather than spending it.
- Reinvestment-rate risk
- The chance that rates have fallen by the time a rung matures, so its proceeds roll into a lower-yielding CD. The advanced rate-shift input lets you model a higher or lower reinvestment environment.
- Liquidity
- How readily you can reach your cash without breaking a CD early. A ladder's liquidity comes from its steady stream of maturities — one rung a year here — rather than from cashing out mid-term and paying a penalty.
- Rolling short CD
- A benchmark that puts the entire deposit in the shortest-term CD and rolls it over each interval. It offers the most access but the lowest yield; the default rolling one-year 4% CD reaches about 148,024 over ten years.
- Single long CD
- A benchmark that keeps the whole deposit at the top rate for the entire horizon, rolling it over as it matures. It earns the most — about 162,889 across the default ten years — but leaves nothing accessible along the way, the opposite trade-off to the short CD.
Good to know
How a CD ladder works: staggered terms that trade lock-up for access
A certificate of deposit pays a fixed rate in return for locking your money away for a set term, and normally you face a choice: reach for the higher rate on a long CD and lose access to your cash, or stay liquid in a short CD and accept a lower yield. A ladder refuses to pick one. It splits a single deposit across several CDs of different lengths, so that instead of one maturity date far in the future you have a steady drumbeat of them. In the default here, 100,000 is divided into five equal rungs of 20,000. The first is a one-year CD, the next a two-year, on up to a five-year, so a rung comes due every twelve months. That staggering is the whole idea. Once the ladder is a few years old, a chunk of your savings is always within a year of maturing, giving you regular chances to spend the cash, move it, or roll it forward — without ever breaking a CD early and swallowing a penalty. Meanwhile the money you are not about to need sits in the longer rungs, earning the fatter rates that reward patience. The calculator builds this structure for you: enter the deposit, the number of rungs and the spacing, and it lays out each rung's term, rate and maturity value. What you see is a portfolio that behaves less like a single locked deposit and more like a slow, dependable conveyor belt of cash, engineered so that liquidity and yield stop being an either-or.
Turning a quoted rate into growth: APY, APR and compounding
Banks advertise CDs with an annual percentage yield, or APY, and that is the figure this calculator expects by default. The APY already folds in how often the CD compounds, which is what makes it the honest number for comparing offers: a 4.9% APY is 4.9% of growth in a year, full stop, whatever the compounding schedule underneath. Enter it against a rung and the maturity value follows directly — principal times one plus the APY, raised to the term in years. So the default one-year rung at 4% turns 20,000 into 20,800, and the five-year rung at 5% grows 20,000 into 25,526 by the time it matures. Some institutions instead quote a nominal rate, or APR, alongside a compounding frequency, and the tool handles that too. Switch the rate type to APR and choose daily, monthly, quarterly or annual compounding, and it converts the nominal figure to an effective one using the standard formula: one plus the nominal rate divided by the frequency, raised to the frequency, minus one. The more often a nominal rate compounds, the higher its effective yield, which is precisely why a 4.8% rate compounded daily can out-earn a 4.85% rate compounded annually. Getting this distinction right matters when you are comparing rungs or shopping across banks, because a rate is only meaningful once you know whether it is nominal or effective. Whenever you are unsure, entering the APY sidesteps the ambiguity entirely, since it is already the number that governs how much each rung will actually be worth at maturity.
Reinvestment and the steady-state ladder
A ladder only reaches its full potential when you keep it running. Each time a rung matures you face the same decision the calculator's reinvestment setting captures: take the cash, or roll it into a new CD. Roll it, and the natural move is into a fresh CD at the longest term, because the rungs below it are already covering your nearer-term needs. Do that every year and the ladder settles into a steady state: a new longest CD opens each interval just as an old one comes due, so you permanently hold the full spread of terms and keep earning the top rate on the money you roll. In the default, reinvestment is on and the tool projects the ladder for ten years. Every maturing rung — starting with the one-year rung at the end of year one — rolls into a new five-year CD at the 5% top rate, and then those reinvested CDs mature and roll again. By year ten the 100,000 has grown to about 161,343. Turn reinvestment off and the character of the tool changes: it stops projecting a rolling strategy and instead simply holds each original rung to maturity, reporting the cash you collect as each comes due. The horizon then pins itself to the longest rung, since nothing happens after the last CD matures, and the five-rung default totals about 114,965 once every rung has paid out. Reinvestment is therefore the difference between a ladder as a living, self-renewing structure and a ladder as a one-time, hold-to-maturity plan — and the calculator lets you see both at the flip of a switch.
Two yields, and why they disagree
The calculator reports two headline rates, and understanding why they differ is the key to reading a ladder correctly. The first is the weighted-average APY: the deposit-weighted mean of the rates across your rungs. Because the default splits the money equally, this is just the simple average of 4%, 4.25%, 4.5%, 4.75% and 5% — a tidy 4.5%. It tells you the blend of rates you are holding at the outset, and nothing more. The second is the realized yield, the compound annual growth the whole ladder actually delivers over the horizon, worked out as the ending value divided by the deposit, raised to one over the number of years, minus one. In the default that comes to about 4.9% — noticeably above the 4.5% average. The gap is entirely down to reinvestment. When the low-rate one-year rung matures, its money does not keep earning 4%; it rolls into a five-year CD at 5%, and the same happens to every short rung as it comes due. Over ten years, more and more of the ladder ends up earning the top rate, so the growth the portfolio realizes outruns the average rate it started with. This is why quoting only the average APY understates a rolling ladder, and why the realized yield is the figure to watch when you care about actual growth. With an inverted curve, where short rungs pay more than long ones, the relationship flips and reinvesting into the lower long rate can drag the realized yield below the average. The two numbers are not redundant: one describes the mix you hold, the other the growth you get.
Ladder versus a single CD: the yield-liquidity spectrum
To judge whether a ladder is worth the effort, you need something to compare it against, so the calculator values two single-CD strategies over the very same horizon. At one extreme is a single long CD: the whole deposit locked at the top rung's rate for the full term. This is the yield-maximiser — in the default it grows the 100,000 to about 162,889 over ten years, the highest of any option — but it is also the least liquid, with nothing accessible until it matures. At the other extreme is a rolling short CD: the entire deposit kept in the shortest term and rolled over each interval. This is the liquidity-maximiser, giving you access every year, but it earns the least, reaching only about 148,024. The ladder occupies the ground between them, and the numbers make its appeal concrete. It ends at about 161,343 — within 1,546 of the fully locked long CD, yet with the same yearly access as the rolling short CD, which it out-earns by roughly 13,319. The tool distils this into a single percentage: the share of the long CD's yield premium the ladder captures, close to 90% in the default. That framing is the honest way to think about a ladder. You are not trying to beat the best possible yield or the best possible liquidity; you are trying to give up as little yield as possible in exchange for meaningful access. A ladder that captures most of the premium while restoring regular liquidity is doing exactly the job it was designed for, and the comparison bars show at a glance whether your particular setup achieves that.
The rate curve, editable rungs and reinvestment-rate risk
The shape of the rates across your rungs — the yield curve — drives much of the ladder's behaviour, and the calculator lets you set it however the market and your bank dictate. Normally the curve slopes upward, because locking money away longer earns a premium; the default rises a quarter-point per rung, from 4% to 5%. The Even curve button fills exactly this kind of gently rising ladder from your shortest rung, as a convenient starting point. But every rung is independently editable, so you can flatten the curve when all terms pay alike, invert it when unusual conditions push short rates above long ones, or drop in the specific promotional rate a bank is offering on one particular term. Entering the real rates you have been quoted always beats relying on a stylised curve. The curve also frames the ladder's central hazard: reinvestment-rate risk. When you build the ladder you know today's rates, but you cannot know the rate a rung will roll into when it matures years from now. If rates have fallen, your maturing cash reinvests at a lower yield than the CD it replaces, and the realized yield slips. A ladder cushions this because only one rung rolls at a time, spreading your reinvestment across many different rate environments rather than betting everything on one. To let you stress-test it, the advanced rate-shift control applies a rise or fall to every reinvested CD, so you can watch how the ten-year projection responds if rates drift down after you build the ladder — or reward you if they climb.
Taxes and inflation: what the ladder really keeps
A CD ladder's headline growth is a before-costs figure, and two forces decide how much of it you actually keep. The first is tax. Interest on an ordinary CD is taxable in the year it is earned and reported to the tax authorities, even if you leave it to compound and never touch it — there is no deferral on a standard, taxable CD. The calculator assumes you pay that tax from money outside the ladder, so it never eats into the compounding itself; instead it shows the tax as a separate line and an after-tax value. Enter your marginal rate and you can see how much of the interest the tax collector takes. Placed inside a tax-sheltered account like an IRA CD, that annual charge does not apply, which is why the setting defaults to zero. The second force is inflation, and it works differently from tax. Inflation leaves the nominal ending value untouched — the ladder is still worth about 161,343 in future currency — but it erodes what that sum can buy. Discounting by 3% a year over the ten-year horizon, the tool restates the balance as about 120,054 in today's money. This matters especially for CDs, because their yields often sit close to the prevailing inflation rate, which means the real, inflation-adjusted return on even a well-built ladder can be slim. Reading the ending value in today's money, alongside the after-tax figure, is the only way to know whether the ladder is genuinely lifting what your money can buy or merely treading water against a rising cost of living. The nominal number alone can flatter a plan that, in real terms, is barely holding its ground.
Common CD-ladder mistakes
Several recurring missteps blunt an otherwise sensible ladder, and the calculator brings each into view. The first is judging the ladder by its average rate. The 4.5% weighted-average APY understates a rolling ladder whose realized yield is nearer 4.9%, so leaning on the average alone sells the strategy short. The opposite error is assuming the realized yield is locked in: it depends on reinvesting at today's rates, and if rates fall, later rungs roll into lower yields than the projection shows. A second mistake is over-reaching for yield by making the ladder too long. A single long CD does earn the most on paper, but it surrenders the very liquidity the ladder exists to provide; stretching every rung out until cash is rarely accessible quietly rebuilds the problem you were trying to solve. Third is ignoring taxes on a taxable CD. Because interest is taxed every year as it accrues, a ladder held in a plain brokerage or bank account keeps less than its headline suggests, and treating the pre-tax figure as spendable overstates the plan. Fourth, and most common, is forgetting inflation. A projected 161,343 feels like solid growth until you notice it is worth about 120,054 in today's money, and that CD yields frequently only track rising prices rather than outpacing them. Fifth is misreading liquidity: a ladder gives you access at each maturity, not on demand, so counting on cash between maturity dates still means breaking a CD and paying a penalty. Finally, some savers build a ladder once and let it lapse, taking every maturity as cash; that is a legitimate choice, but it forfeits the compounding a rolling ladder provides. None of these is fatal, and each is easy to check by adjusting an input and watching the result move.
Building a ladder in practice, and the limits of this estimate
Turning the projection into a real ladder is straightforward, but a few practical choices shape the outcome. Decide first how much regular access you want, because that sets the spacing: annual maturities suit most savers, while tighter spacing buys more frequent liquidity at the cost of leaning on shorter, lower-yielding terms. Next choose the number of rungs — more rungs smooth the cash flow and lengthen the top term, but spread the deposit thinner, which can bump against a bank's minimum deposit per CD. Then shop the actual rates for each term, since a promotional CD on one particular length can reshape the whole curve, and enter those real figures rather than the default slope. Finally, decide up front whether you intend to roll maturities or spend them, because that choice, more than any other, determines how the ladder grows. The calculator is built to compare these decisions: save a setup, change one lever, and line the versions up side by side. What it deliberately does not model is as important as what it does. It assumes equal rungs, no early withdrawals, taxes paid from outside the ladder, and — crucially — that you can reinvest at the rates shown, when in reality future rates are unknown and will differ. It leaves out bank-specific minimums, callable and promotional CDs, deposit-insurance limits, and the penalties for breaking a CD early, all of which belong to the real world beyond a steady-rate model. Read the output as a directional estimate that clarifies the yield-versus-liquidity trade-off, not as a prediction of a precise balance. Nothing here is financial or tax advice; confirm current rates and terms with your bank, and for a large or long commitment, with a qualified professional who can weigh the details this model keeps simple.
Frequently asked questions
What is a CD ladder, and how does this calculator model one?
A CD ladder splits a lump sum across several certificates of deposit with staggered terms, so one matures on a regular schedule while the rest keep earning longer-term yields. This tool divides your deposit equally into the number of rungs you pick, gives rung one the shortest term and rung five the longest, and grows each at the yield you set. It then steps the whole ladder forward date by date, maturing each rung in turn. The default splits 100,000 into five one-to-five-year rungs and, reinvesting for ten years, projects a value of about 161,343.
Why build a ladder instead of putting everything in one CD?
It is a deliberate compromise between yield and access. One long CD pays the most but locks every dollar away until it matures; one short CD keeps you liquid but earns the least. A ladder sits between them, capturing much of the long-term yield while still freeing a slice of cash on a regular cadence. In the default, the ladder earns about 13,319 more than rolling a one-year CD — with the same yearly access — and gives up only about 1,546 versus locking it all in a five-year CD, capturing close to 90% of that CD's yield advantage.
What does the reinvestment setting do, and what if I turn it off?
With reinvestment on, each rung that matures rolls its full proceeds into a new longest-term CD at the top rung's rate, so the ladder stays at full length and reaches a steady state of one maturity per interval. The projection then runs for the number of years you choose — ten by default. Turn reinvestment off and the tool instead holds every rung to its own maturity and reports the cash you collect as each comes due; the horizon is pinned to the longest rung's term, so the default five-rung ladder totals about 114,965 once all five have matured.
Why does the realized yield differ from the weighted-average APY?
They measure two different things. The weighted-average APY is simply the deposit-weighted average of the rates you hold across the rungs — 4.5% in the default. The realized yield is the compound annual growth the whole ladder actually achieves over the horizon, about 4.9% here. Reinvestment is what separates them: as the lower-rate short rungs mature, their money rolls into new CDs at the higher 5% top rate, so over ten years the ladder grows faster than its starting average rate would suggest. Turn reinvestment off and the gap widens the other way — the calculator holds every rung to its own maturity and the cash from earlier rungs then sits idle rather than compounding, so the realized yield falls to roughly 2.8% a year, further below the unchanged 4.5% average.
How does the ladder compare with a single long CD or a rolling short CD?
The calculator values all three over the same horizon so the trade-off is explicit. The single long CD locks the whole deposit at the top rate — the highest ending value, about 162,889 in the default, but no access until year five. The rolling short CD keeps everything in the shortest term and rolls it each year — full annual access, but the lowest value, about 148,024. The ladder lands between, and a single figure sums it up: it captures roughly 90% of the long CD's yield premium while matching the short CD's yearly liquidity.
Do I have to use the rising rate curve, or can I set each rung myself?
Each rung's yield is fully editable — type whatever your bank offers on that term, including a flat curve where every rung pays the same or an inverted one where short CDs pay more than long. The Even curve button is only a convenience: it fills a gently rising ladder from your shortest rung's rate as a realistic starting point. Because real CD offers vary by bank and promotion, entering the actual rates you have been quoted gives the most accurate projection.
Should I enter APY or APR, and what is the compounding frequency for?
Enter an APY if that is what your bank advertises — it is already the effective yearly yield, so the compounding frequency does not change it. Choose APR instead if you have a nominal rate, and set how often it compounds; the tool then converts it to an effective rate using one plus the rate over the frequency, raised to the frequency, minus one. Daily or monthly compounding on the same nominal rate produces a slightly higher effective yield than annual, which is exactly why banks quote APY for comparison.
How is CD interest taxed, and how does the tool handle it?
Interest on a standard CD is taxable each year as it is earned and reported to the tax authorities, even when you leave it to compound and do not withdraw it. The calculator assumes you pay that tax from other funds, so it never slows the ladder's compounding; instead it reports the tax as a separate after-tax figure. Enter your marginal rate and the tool shows the total tax and the after-tax value. Set it to zero for a tax-advantaged account such as an IRA CD. These are flat-rate estimates, not tax advice.
What does the inflation setting change?
Inflation does not alter the ladder's nominal value — the ending balance is whatever the rates and reinvestment produce. What it changes is buying power. The tool discounts the ending figure by your inflation rate over the horizon to show the value in today's money: at 3% inflation, the default 161,343 is worth about 120,054 today. Because CD yields are often close to the inflation rate, the real, inflation-adjusted return on a ladder can be modest, which is a useful reality check the nominal figure alone can hide.
What happens when I change the number of rungs or the spacing?
More rungs spread the same deposit into smaller slices and lengthen the ladder, since the top rung's term grows with the count — though the cadence of maturities is set by the spacing, not the number of rungs. Wider spacing lengthens each rung's term — two-year spacing on five rungs reaches a ten-year top CD — while tighter spacing brings maturities closer together for more frequent access. The tool re-splits the deposit equally and rebuilds every rung as you change these, so you can watch the yield-versus-liquidity balance shift in real time.
Does this include early-withdrawal penalties?
No. The whole point of a ladder is to avoid early-withdrawal penalties by always having a rung about to mature, so the model assumes you never break a CD early and never incur a penalty. If you think you might need to cash out mid-term, a separate early-withdrawal calculator will estimate the penalty — usually several months of interest — which is exactly the cost a well-planned ladder is designed to sidestep.
What is reinvestment-rate risk, and can the tool model changing rates?
Reinvestment-rate risk is the danger that interest rates fall before a rung matures, so its proceeds roll into a lower-yielding CD than the one that just ended. A ladder softens this by only ever rolling a fraction at a time, but it cannot remove it. Under advanced options the rate-shift input lets you apply a rise or fall to every reinvested CD, so you can see how the ten-year projection holds up if the rate environment turns against you or in your favour.
Are these the exact returns I will earn?
No — treat them as a planning estimate. The projection holds each rung's rate steady and assumes you reinvest at the rates shown, but real CD rates move with the market, so the yields available when a rung matures years from now are unknowable today. The tool also assumes equal rungs, no early withdrawals, and taxes paid from outside the ladder. It is best used to compare strategies — more rungs versus fewer, reinvesting versus holding — rather than to predict a precise balance on a precise date.
Should I rely on this instead of professional guidance?
Please don't. Treat it as a learning tool for seeing how a CD ladder behaves, offered as general information and not as personalised financial, investment, or tax guidance. It sets aside bank-specific minimums, promotional and callable CDs, FDIC or other deposit-insurance limits, penalty terms, and the real path of future interest rates, and it assumes your inputs hold for the whole horizon. Before committing a meaningful sum, confirm current rates and terms with your bank and, where the stakes warrant it, with a qualified financial professional.