Estimate certificate-of-deposit maturity value, interest and APY, with optional illustrative taxes, early-withdrawal penalties and two-offer comparison.
01 / CERTIFICATE OF DEPOSIT
Enter a deposit, annual rate and term. Examples are editable. The default rate is nominal annual interest (APR-style), not advertised APY; change the quote convention in Advanced if needed.
02 / MATURITY ESTIMATE
Calculate to see maturity value, interest, annual yield and optional scenarios.
03 / ASSUMPTIONS
For principal P, nominal annual rate r as a decimal, m periods/year and t years: compound value = P(1+r/m)^(mt); APY = (1+r/m)^m − 1. Continuous value = Pe^(rt), APY = e^r − 1. Simple-interest value = P(1+rt), with no reinvestment; its one-year yield equals r.
An entered APY is converted through log(1+APY) to the selected compounding convention, without treating it as nominal APR. Fractional periods use geometric accrual — for example, a quarter of an annual period uses exponent 0.25. Actual CDs may use daily simple accrual, actual dates, different day-count rules or discrete crediting. The monthly schedule is an accrued-value illustration, not a bank statement or payout schedule.
No additional deposits, variable rates, calls or fees are modeled. Taxes are illustrative, and deposit insurance limits and eligibility vary by jurisdiction, institution and account. No investment return, insurance coverage or recommendation is guaranteed.
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Enter deposit, annual rate and term. Match the nominal-rate or APY quote convention, calculate and review optional tax, withdrawal, comparison and monthly accrual details.
Beginner-friendly controls, optional advanced settings, transparent estimates and private browser-local calculation.
Inputs are processed locally in your browser; no photos, uploads or personal profiles are required.
A nominal annual rate does not include within-year compounding. APY is the effective one-year yield: (1 + r/m)^m minus one for nominal rate r and m periods per year. APY quotes are converted to the selected compounding convention rather than treated as nominal rates.
The model uses geometric fractional-period accrual: P(1 + r/m)^(m × months/12). Continuous compounding uses an exponential, while simple interest uses P(1 + r × months/12). Actual CDs can use daily simple accrual, actual dates or different crediting rules, so check the contract.
It shows modeled accrued balance and interest at each whole month, before tax. It is not a bank statement, actual interest posting calendar or monthly payout schedule. Simple-interest earnings are assumed paid at maturity without reinvestment.
Total modeled interest is multiplied by the entered marginal tax rate and deducted at maturity, without reducing compounding during the term. Actual annual taxation, withholding, account exemptions and local rules can produce different outcomes. No tax advice is provided.
Penalty equals the original deposit times the equivalent nominal annual rate times penalty months divided by twelve. It is not limited to earned interest and may reduce principal. Early proceeds are a separate before-tax scenario; the tool does not model penalty deductions, tax effects or every institution’s contract.
No. Currency selection only formats amounts; it does not apply exchange rates. The optional second offer uses the same deposit and term for an arithmetic comparison. Variable rates, calls, fees and jurisdiction-specific deposit insurance are excluded; no investment recommendation or coverage guarantee is made.