CD Calculator
Maturity value · interest earned · APY — plus early withdrawal penalty impact
Monthly schedule
| # | Opening | Interest | Closing |
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Annual summary
| Year | Opening | Interest | Cum. interest | Closing |
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Compare the same deposit across three CD offers. Edit each rate/term to match quotes you've actually received — see the CD guide for what typically moves rates.
Independent verification of the compounding formula and APY conversion.
Tips for getting the most out of a CD
Compare APY, not just the "rate"
Two CDs with the same nominal rate can pay different amounts if one compounds daily and another compounds monthly or annually. Always compare the APY — it already accounts for compounding frequency.
Match the term to money you won't need
Only lock up cash you're confident you won't need before maturity. Check the Early Withdrawal tab above with your bank's actual penalty terms before committing to a long term.
Consider a CD ladder
Instead of putting everything into one term, split your deposit across several CDs with staggered maturities (e.g. 6, 12, 18 and 24 months). You keep access to some cash regularly while still capturing longer-term rates on the rest.
Know your deposit insurance limits
FDIC (banks) and NCUA (credit unions) insurance typically covers up to $250,000 per depositor, per institution, per ownership category. Spread larger sums across institutions if you're above that limit.
Watch for auto-renewal
Most CDs auto-renew into a new term at maturity, often at a different rate, unless you act during a short grace period. Set a reminder near your maturity date so you don't roll into an uncompetitive rate.
Budget for the tax bill
CD interest is usually taxable in the year it's earned, even on a multi-year CD where you haven't touched the money. Enter your marginal tax rate in "Taxes, goal & early withdrawal defaults" above to see an after-tax estimate.
Frequently asked questions
What is a CD calculator?
A CD calculator estimates what a Certificate of Deposit will be worth at maturity. Enter your deposit, rate, compounding frequency and term to see total interest earned and the effective APY.
How is CD interest calculated?
Most CDs compound: interest is calculated on the principal plus any interest already credited, at set intervals (daily, monthly, quarterly, etc.). More frequent compounding produces a slightly higher effective yield for the same nominal rate.
What's the difference between APY and interest rate?
The interest rate is the base annual rate before compounding. APY (Annual Percentage Yield) reflects the actual return once compounding is applied, so it's always equal to or higher than the nominal rate.
Is there a penalty for early CD withdrawal?
Usually yes — commonly a set number of months' interest, deducted if you close the CD before its term ends. No-penalty CDs skip this fee but typically pay a lower rate. Use the Early Withdrawal tab above to see the real dollar impact.
Are CD earnings taxable?
Yes — interest is generally taxed as ordinary income in the year it's earned, even before you withdraw it, unless the CD sits inside a tax-advantaged account such as an IRA.
What's a good CD rate right now?
It depends on the term and the broader rate environment, so there's no single answer. Online banks and credit unions often post more competitive rates than large traditional banks — compare a few offers with matching terms before you commit.
Want the full picture before you open a CD?
This calculator estimates the numbers, but the terms themselves are worth understanding first. Our guide covers how CDs compare to high-yield savings, what a CD ladder looks like in practice, and the fine print — early withdrawal penalties, auto-renewal, and deposit insurance limits — that separates a good CD from a mediocre one.
Read: The Complete Guide to Certificates of Deposit →Sources
- FDIC: Deposit Insurance FAQs — coverage limits (currently $250,000 per depositor, per insured bank, per ownership category) used as the basis for the insurance-limit tip above.
- NCUA: Share Insurance Fund — the credit-union equivalent of FDIC coverage for CDs held at federally insured credit unions.
- CFPB: Bank Accounts & CDs consumer guidance — general information on how CDs, early withdrawal penalties, and auto-renewal terms typically work.
- IRS Topic 403: Interest Received — confirms that CD interest is generally taxable as ordinary income in the year it's credited, used for the tax-related guidance above.
Default rates and terms in this calculator's quick-start presets are illustrative starting points based on typical market ranges — always replace them with your own institution's actual disclosed APY and terms.
Disclaimer
This calculator is provided for general informational and educational purposes only and does not constitute financial, tax, or legal advice. It is not affiliated with, endorsed by, or a substitute for consultation with your bank, credit union, or a licensed financial advisor.
All figures — including maturity value, total interest earned, effective APY, after-tax interest, and the early withdrawal illustration — are approximations based on the numbers you enter and standard compound-interest formulas. They do not account for institution-specific rounding, minimum balance requirements, promotional rate step-downs, or the exact day-count convention your bank uses.
The "Effective yield" shown is a mathematical APY derived from your stated nominal rate and compounding frequency; it may differ slightly from the APY your institution actually advertises or discloses. The early-withdrawal scenario is a simplified illustration of how a typical "months of interest" penalty works and may differ from your specific CD's terms. Always confirm the actual APY, penalty schedule, and total payout in your official account disclosure before opening or closing a CD.
FinToku is not a bank or credit union and does not hold deposits, pay interest, or guarantee any rate. Use of this tool does not create any financial relationship between you and FinToku. You are solely responsible for decisions made using these estimates. See our full Financial Disclaimer.
Free tool by FinToku · Results are indicative. Consult your bank or credit union for exact figures.