CD Ladder Calculator
Build a certificate of deposit ladder to maximize yield while keeping money accessible
Last reviewed:
What Is a CD Ladder?
A CD ladder is a fixed-income strategy that splits your savings across multiple certificates of deposit with staggered maturity dates. Instead of putting all your money in one CD, you divide it into equal portions — one maturing each year. When the shortest-term CD matures, you reinvest into the longest term, maintaining a rolling ladder that provides both yield and periodic liquidity.
The strategy solves the core CD dilemma: longer terms pay higher rates, but they also lock up your money longer. A ladder captures much of the long-term rate advantage while ensuring a portion of your funds becomes available every year.
How a CD Ladder Works
Building the Ladder
For a 5-rung ladder with $25,000:
| Rung | Amount | Term | Purpose |
|---|---|---|---|
| 1 | $5,000 | 1 year | Matures soonest — emergency access |
| 2 | $5,000 | 2 years | Matures year 2 |
| 3 | $5,000 | 3 years | Matures year 3 |
| 4 | $5,000 | 4 years | Matures year 4 |
| 5 | $5,000 | 5 years | Earns the highest rate |
Reinvestment After the First Cycle
When Rung 1 matures after 12 months, you take the proceeds and open a new 5-year CD. Now you have rungs maturing in years 1, 2, 3, 4, and 5 again — but all five rungs are earning 5-year rates (or whatever the prevailing 5-year rate is when you reinvest). After the first full 5-year cycle, every rung in the ladder is a 5-year CD at different stages of maturity, maximizing yield while maintaining annual liquidity.
A Worked Example
$25,000 total investment, 5 equal rungs:
| Rung | Term | APY | Principal | Interest | Matures |
|---|---|---|---|---|---|
| 1 | 1 yr | 4.5% | $5,000 | $225 | Apr 2027 |
| 2 | 2 yr | 4.2% | $5,000 | $432 | Apr 2028 |
| 3 | 3 yr | 4.0% | $5,000 | $624 | Apr 2029 |
| 4 | 4 yr | 3.8% | $5,000 | $800 | Apr 2030 |
| 5 | 5 yr | 3.5% | $5,000 | $938 | Apr 2031 |
Total interest earned: $3,019
Total at maturity: $28,019
Blended APY: approximately 4.0%
Note that Rung 1 earns slightly more than Rung 5 in this example because short-term rates currently exceed long-term rates (an inverted yield curve). In a normal yield curve environment, longer rungs earn more.
CD Ladder Strategies for Different Rate Environments
Normal Yield Curve (Long > Short)
Standard 5-rung equal-weighted ladder. Longer terms earn more, and the ladder captures that premium while maintaining annual liquidity. Most effective environment for CD laddering.
Inverted Yield Curve (Short > Long)
Currently common. Short-term CDs pay more than long-term. Two options:
- Short ladder: Use 6-month, 12-month, 18-month, 24-month rungs to capture high short-term rates while keeping reinvestment flexibility
- Barbell: Put majority in 1-year CDs (capturing peak rates) plus a small allocation in 5-year CDs as a hedge against a rate drop
Rising Rate Environment
Favor shorter rungs (6-month, 1-year) to reinvest sooner at higher rates. Consider a 3-rung ladder (1-year, 2-year, 3-year) with heavier weighting toward the short end.
Falling Rate Environment
Lock in longer terms now. Shift toward a 4-rung or 5-rung ladder with heavier weighting in 3-year and 5-year CDs. Avoid the temptation of keeping too much in short-term CDs when rates are heading down.
CD Ladders vs. Other Fixed-Income Options
vs. High-Yield Savings Account (HYSA)
HYSAs offer fully liquid funds at variable rates. CDs offer fixed rates for a set term with early withdrawal penalties. When CD rates exceed HYSA rates (common for 1–5 year terms), the CD ladder earns more. When you need guaranteed access without penalty, HYSA wins.
vs. Treasury Bonds / T-Bills
US Treasuries are also FDIC-safe-equivalent (backed by the full faith of the US government) and often have competitive rates. T-Bills (short-term), T-Notes (medium-term), and I-Bonds (inflation-adjusted) each serve different roles. I-Bonds in particular are a strong alternative when inflation is high — they’re inflation-indexed and tax-deferred. The ladder concept applies equally to Treasuries.
vs. Money Market Funds
Money market funds offer daily liquidity at competitive short-term rates. They’re not FDIC insured (though very low risk), rates fluctuate daily, and they’re held at a brokerage rather than a bank. Good for the liquid portion of a portfolio alongside a CD ladder for the locked portion.
Key Assumptions and Limitations
The calculator uses monthly compounding for interest calculations. Actual compounding frequency varies by institution — daily compounding produces slightly more interest than monthly. APY inputs should reflect the Annual Percentage Yield (which already accounts for compounding), not the nominal rate. Equal distribution across rungs is assumed — you can model unequal allocations by adjusting the total and rung count to match your desired split. Reinvestment rates for future rungs are not modeled — the calculator shows first-cycle earnings only. Early withdrawal penalties are not included.
Frequently Asked Questions
What is a CD ladder?
A CD ladder is a savings strategy where you split a lump sum across multiple certificates of deposit with different maturity dates — typically 1-year, 2-year, 3-year, 4-year, and 5-year CDs. As each CD matures, you reinvest into the longest term to maintain the ladder. This gives you regular access to a portion of your money (useful for emergencies or opportunities) while still earning the higher rates available on longer-term CDs.
Why build a CD ladder instead of putting everything in the highest-rate CD?
Putting all your money in a single 5-year CD maximizes rate but locks up your entire savings for 5 years. If rates rise, you can't take advantage. If you need the money early, early withdrawal penalties can cost months of interest. A ladder solves both problems: one rung matures every year (giving you access), and as each rung matures you can reinvest at whatever rates are available then — naturally adapting to rate changes.
What is a good CD ladder strategy when interest rates are falling?
When rates are falling, lock in longer terms before rates drop further. Build a ladder weighted toward longer rungs (3-year, 4-year, 5-year) rather than shorter ones. You can skip or minimize the 1-year rung if you don't need near-term liquidity. The goal is to capture current rates for as long as possible before they fall.
What is a good CD ladder strategy when interest rates are rising?
When rates are rising, keep more money in shorter-term CDs so you can reinvest at higher rates sooner. A barbell strategy — heavy weighting in 1-year and 5-year CDs with less in the middle — captures current long-term rates while maintaining flexibility as short-term rates climb.
Are CDs FDIC insured?
Yes. CDs at FDIC-member banks are insured up to $250,000 per depositor, per institution, per account category. If you're laddering more than $250,000, spread CDs across multiple FDIC-insured institutions to maintain full coverage. Credit union CDs are insured by NCUA under the same limits.
What are typical CD early withdrawal penalties?
Early withdrawal penalties vary by term and institution. Common penalties: 3 months interest for CDs under 1 year, 6 months interest for 1–2 year CDs, 12 months interest for 3–5 year CDs. Some online banks offer no-penalty CDs (typically at slightly lower rates) that allow withdrawal after a short lock-up period. Factor in penalties when planning your ladder — a 5-year CD with a 12-month penalty effectively becomes accessible after 4 years if you're willing to pay the penalty.