What is a CD (Certificate of Deposit)?
A Certificate of Deposit (CD) is a time deposit offered by banks and credit unions. You agree to keep your money in the account for a fixed period (the term) in exchange for a higher interest rate than regular savings accounts.
Key Features of This Calculator
- Compound Frequency: Choose how often interest is compounded (Monthly, Quarterly, or Annually). More frequent compounding generally yields higher returns.
- Tax Consideration: You can input your marginal tax rate to see the after-tax interest you will actually keep.
- Early Withdrawal: Most CDs charge penalties for early withdrawal. This calculator assumes you hold the CD until maturity.
How the Calculation Works
We use the compound interest formula with regular compounding periods:
A = P (1 + r/n)nt
Where P = Initial Deposit, r = Annual Rate, n = Compounding periods per year, t = Time in years.
Tips for Choosing a CD
- Compare APY (Annual Percentage Yield), not just the interest rate.
- Consider ladder strategies (multiple CDs with different maturity dates).
- Check if the bank is FDIC insured (up to $250,000 per depositor).
- Be aware of early withdrawal penalties before committing.