CD calculateur

APY mode: maturity value = deposit × (1 + APY)^months/12. APY already incorporates compounding. A partial year is modeled as a fraction of 12 months; this need not match your bank's actual-day method.

Nominal-rate mode: maturity value = deposit × (1 + nominal rate / n)^{n × months/12}, where n is the selected compounding frequency. Switching rate type converts the rate to approximately preserve the same effective annual yield.

Maturity date: the start date plus the selected whole number of calendar months; if the target month lacks that day, the date is clamped to the last day of the month. Banks may follow their own holiday and maturity rules.

Interest and tax: gross interest = final balance − principal. The optional tax example applies the entered rate to total estimated interest and does not deduct tax periodically or calculate actual tax liability.

Early withdrawal: the optional day-based penalty assumes simple interest on the original principal: deposit × nominal annual rate × penalty days / 365. APY inputs are converted to an illustrative daily-compounded nominal equivalent. The bank may use a different rate or base. Penalties can exceed earned interest and reduce principal. A flat dollar penalty can also be entered.

Important: results assume a fixed rate, no new deposits, no interim withdrawals, and earnings kept in the CD. Callable, brokered, variable-rate or interest-distributing CDs may behave differently. Deposit insurance depends on the institution, account ownership, and combined deposits; this calculator does not determine insurance eligibility. This is not a bank offer or individualized financial or tax advice.