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CD Ladder Optimizer

Should you build a CD ladder, keep your cash liquid, or use a single CD? This decision engine weighs after-tax income, your blended ladder APY, and your liquidity needs — then ranks the options.

Quick answer: Decide whether to build a CD ladder, keep cash liquid, or use a single CD — with after-tax income, weighted APY, and liquidity warnings. Enter Total cash to invest, Cash you may need within (months), Emergency reserve to keep liquid, and Planning horizon (months) to personalize the estimate. It returns Recommended move, Weighted ladder APY, and Extra interest vs savings so you can compare the impact before choosing a next step. Use it to compare cash flow, interest, liquidity, and next-account choices before moving money.

Your situation
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Alternatives
Ladder strategy
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Your decision

Build a CD ladder: a ladder of $25,000 blends to 4.19%, earning about $765 after tax in year one.

Recommended: Build a CD ladder
Your ladder

Splitting $25,000 this way: $5,000 at 3 months (4.20% APY), $5,000 at 6 months (4.30% APY), $5,000 at 12 months (4.25% APY), $5,000 at 18 months (4.20% APY), $5,000 at 24 months (4.00% APY). That blends to a 4.19% weighted APY.

CD ladder rung allocation by term
TermAPYAllocated
3 mo4.20%$5,000
6 mo4.30%$5,000
12 mo4.25%$5,000
18 mo4.20%$5,000
24 mo4.00%$5,000

Recommended move

Good

Build a CD ladder

Based on your horizon, liquidity needs, and the CD-vs-savings rate spread.

Weighted ladder APY

Watch

4.19%

vs 4.20% savings

Principal-weighted average APY across all rungs.

Extra interest vs savings

Watch

$-2

per year, pre-tax

Gross interest from the ladder minus what the same cash would earn in high-yield savings.

After-tax income

$765

year one

Total gross interest taxed at your 27.00% combined rate.

Ranked options

  1. #1Build a CD ladder

    Blended 4.19% across 5 rungs, with a CD maturing regularly for reinvestment and access.

    Confidence: HighEffort: MediumRisk: Low

  2. #2Use a single longer-term CD

    Simplest lock-in for a single short horizon, but no rolling liquidity.

    Confidence: MediumEffort: LowRisk: Low

  3. #3Keep it all in high-yield savings

    Full liquidity at 4.20%. Best when rates are inverted or you may need the cash soon.

    $1,050/yr
    Confidence: HighEffort: LowRisk: Low

Watch-outs

  • • You expect to need cash within 6 months but no emergency reserve is kept liquid. Breaking a CD early could cost about $52 in penalties.

Assumptions used

Total cash
$25,000
Strategy
equal rungs
Emergency reserve kept liquid
$0
Combined tax rate
27.00%
Early-withdrawal penalty
3 months interest

Estimates based on your assumptions above — roughly indicative, not financial, tax, or legal advice.

Next steps

Compare Top CD Rates →

Why this matters

A CD ladder only beats high-yield savings when CD rates are higher than your savings APY and you can keep the cash locked. When rates are inverted, or you may need the money soon, staying liquid is the smarter move. This tool shows the crossover for your exact situation, after tax.

Frequently asked questions

What is a CD ladder?
A CD ladder splits your cash across CDs of staggered terms (for example 3, 6, 12, 18, and 24 months). As each CD matures you reinvest it at the longest rung, so a CD comes due regularly — giving you rolling access while capturing longer-term rates.
Is a CD ladder better than a high-yield savings account?
Only when CD rates exceed your savings APY and you can leave the money untouched. If your savings account pays as much as the CDs, or you might need the cash, a high-yield savings account gives the same return with full liquidity. This calculator compares both after tax.
How is the after-tax income calculated?
Gross interest from every rung is summed, then taxed at your combined federal and state marginal rate. CD interest is taxed as ordinary income in the year it is earned, so your real take-home is lower than the headline APY suggests.
What happens if I break a CD early?
Most CDs charge an early-withdrawal penalty of several months of interest. The tool estimates that cost and warns you if a near-term cash need is not protected by a liquid emergency reserve — the most common CD-ladder mistake.
How many rungs should my ladder have?
Three to five rungs is typical. More rungs smooth out reinvestment risk and give more frequent access, but add complexity. Choose the strategy (equal, liquidity-first, or yield-first) that matches whether you value access or return more.
How is my cash split across the ladder rungs?
By default, cash is split evenly across the 3, 6, 12, 18, and 24-month rungs. Switch to "Liquidity first" to weight more cash toward shorter rungs for faster access, or "Yield first" to tilt the split toward whichever rungs currently pay the highest APY. The calculator shows the exact dollar amount for each rung based on your chosen strategy.

This tool produces estimates based on the assumptions you enter. It is not financial, tax, or legal advice. Actual rates, fees, and outcomes depend on your lender, account terms, and approval.

CD Ladder Optimizer — Ladder, Stay Liquid, or Single CD? | SwitchWize