CD Calculator
Calculate savings growth, set financial goals, and track progress toward major purchases or emergency funds.
CD Details
Penalty & Tax Information
Maturity Results
Effective Annual Rate
True annualized return
After-Tax Value
At 22.00% tax rate
After-Tax Yield
Annual after-tax return
Deposits vs Interest
Early Withdrawal Impact
CD vs Savings Comparison
Real Value (Inflation-Adjusted)
Loss: $255
CD Investment Guide
When CDs Make Sense:
- Known future expenses (college, home purchase)
- Conservative investment approach
- Stable or declining interest rate environment
- Part of diversified portfolio
Alternatives to Consider:
- High-yield savings accounts
- Money market accounts
- Treasury bills and bonds
- Bond funds or ETFs
Maximizing CD Returns:
- Shop around for best rates
- Consider online banks
- Use CD laddering strategies
- Time purchases with rate cycles
Tax Considerations:
- Interest is taxed as ordinary income
- Consider tax-deferred accounts (IRA)
- Municipal bonds for higher tax brackets
- Factor in state tax rates
How it works
A certificate of deposit locks a fixed sum at a fixed rate for a fixed term. Interest compounds over the term, and because the rate is guaranteed you know the exact maturity value up front — the trade-off being an early-withdrawal penalty if you need the money sooner.
Maturity value
A = P · (1 + r/m)^(m · t)
- A
- value at maturity
- P
- deposit (principal)
- r
- annual rate (decimal)
- m
- compounding periods per year
- t
- term in years
Worked example
- Deposit P = $10,000
- Rate = 4.5%, compounded monthly
- Term = 5 years
- A = 10,000 × (1 + 0.045/12)^(12 × 5)
- A = 10,000 × 1.00375⁶⁰
Maturity value ≈ $12,520 — about $2,520 in guaranteed interest.
Good to know
- Pulling out early forfeits interest (often 3–12 months' worth), so only commit money you won't need before maturity.
- A CD ladder — splitting cash across staggered terms — keeps part of your money accessible each year while still capturing longer-term rates.
- CDs are FDIC-insured up to $250,000, and the locked rate protects you if market rates fall (but you miss out if they rise).
Related Calculators
Frequently Asked Questions
How does a certificate of deposit work?
You commit a fixed sum at a fixed rate for a fixed term — commonly 3 months to 5 years. Because the rate is locked, the maturity value is known exactly up front; the trade-off is a penalty if you withdraw before the term ends.
How is CD interest calculated?
With compound interest: A = P(1 + r/m)^(m·t). A $10,000 CD at 4.5% compounded monthly for 5 years matures at about $12,520 — roughly $2,520 of guaranteed interest.
What happens if I withdraw from a CD early?
Banks charge an early-withdrawal penalty, typically forfeiting 3 to 12 months of interest depending on the term length. On a young CD the penalty can eat into principal, so only commit money you can leave untouched until maturity.
What is a CD ladder?
Splitting your money across CDs with staggered maturities — say 1, 2, 3, 4, and 5 years — so a portion matures every year. You capture longer-term rates on most of the money while keeping regular access, and reinvest each maturing rung at current rates.
Are CDs insured?
Yes — CDs at FDIC-member banks (and NCUA credit unions) are insured up to $250,000 per depositor, per institution, per ownership category. That makes a CD's return effectively risk-free up to the limit, unlike bonds or bond funds which can lose value.