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CD Calculator (Certificate of Deposit)

Project CD maturity value, see early-withdrawal penalty impact, and compare CD returns to a high-yield savings account over the same period.

FINANCE

Project the maturity value of a Certificate of Deposit at fixed APY, model an early-withdrawal penalty in months of interest, and compare CD returns to a high-yield savings account over the same period.

Inputs: initial deposit, APY, term in months, compounding frequency (daily through annual), penalty in months of interest, optional early-withdrawal month, and an HYSA APY for comparison. Outputs maturity value, total interest, effective annual yield, and an early-withdrawal scenario. The HYSA comparison shows the dollar gap so you can weigh the trade-off of locking in vs staying liquid.

Disclaimer: APYs change frequently and the FDIC insures up to $250,000 per depositor per bank. Penalty rules vary by bank and term length - read the disclosure before depositing. Brokered CDs on the secondary market price differently.

CD Calculator (Certificate of Deposit)

Project the maturity value of a Certificate of Deposit, see the impact of an early-withdrawal penalty, and compare CD returns to a high-yield savings account.

Top US CDs in May 2026: ~4.0% (3-month) to ~4.5% (12-18 month).
Typical: 3 months for terms ≤1 yr, 6 months for 2-3 yr, 12 months for 5 yr.
Set to 0 to hold to maturity. Otherwise shows penalty impact.
Use this to weigh locking in a CD vs keeping money liquid in an HYSA.
Value at Maturity
$10,460
Total Interest Earned$460
Effective Annual Yield4.602%

CD vs HYSA over the same period

CD (locked at APY)$10,460
HYSA (variable APY)$10,407
CD advantage+$52.83

Should You Open a CD?

A Certificate of Deposit (CD) is a time deposit that locks your money in for a fixed term (3 months to 5 years) at a fixed APY, with FDIC insurance up to $250,000. The trade-off vs a High-Yield Savings Account: you give up liquidity (you owe a penalty if you withdraw early) in exchange for a guaranteed rate, even if market rates fall.

CDs make most sense when you (1) have money you definitely will not need before maturity, and (2) believe rates are at or near a peak. In a falling-rate environment, locking in a 4.5% CD now beats accepting a 3% HYSA in six months. In a rising-rate environment, an HYSA wins because it tracks upward.

A CD ladder smooths the trade-off: split your money across 1-yr, 2-yr, 3-yr, 4-yr, and 5-yr CDs. Each year one CD matures and you renew at the then-current 5-year rate. You always have 20% maturing within a year (liquidity) and capture the highest end of the rate curve over time.

APYs change frequently. FDIC insurance covers up to $250,000 per depositor per bank. Early withdrawal penalties vary by bank and term; review the disclosure before deposit. Brokered CDs traded on the secondary market have different mechanics.

Frequently Asked Questions

How does a Certificate of Deposit work?
A CD is a fixed-term, fixed-rate deposit account. You commit your money for a set period (3 months to 5 years), and the bank pays you a guaranteed APY for the entire term. Withdrawing before maturity incurs an early-withdrawal penalty, usually 3 to 12 months of interest depending on the term. At maturity you get your principal plus all earned interest.
What is a CD ladder and should I build one?
A CD ladder splits your money across multiple CDs of staggered maturities. A classic 5-year ladder buys equal amounts in 1-yr, 2-yr, 3-yr, 4-yr, and 5-yr CDs. Each year one matures and you renew it as a fresh 5-year CD. You always have 20% maturing within a year (liquidity) while capturing the higher end of the rate curve over time.
When should I open a CD instead of using an HYSA?
CDs make sense when (1) you have money you definitely will not need before maturity and (2) you believe rates are at or near a peak. Locking in a 4.5% CD beats taking a 3% HYSA six months later if rates fall. In a rising-rate environment, a no-penalty CD or an HYSA usually wins because they capture upward moves.
Can I deduct my CD early-withdrawal penalty on my taxes?
Yes. Early-withdrawal penalties on CDs are deductible from your gross income on Schedule 1 of your federal tax return (line 18 in recent years), regardless of whether you itemize. This is an above-the-line deduction, so you can still take the standard deduction and still get the benefit.

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