Using this CD calculator
This tool follows the same two-column layout as our Daily Compound Calculator and other finance tools: enter values on the left, click Calculate, and review totals plus schedules on the right.
- Initial deposit — the lump sum you place into the CD at opening.
- Interest rate — the quoted annual rate. Meaning depends on the compound dropdown (APY vs APR).
- Compound frequency — annually (APY), semiannually, quarterly, monthly (APR), or continuously.
- Deposit length — years and months until maturity.
- Marginal tax rate (optional) — estimated income tax on interest if the CD is taxable.
- Review results — end balance, total interest, donut chart, and annual or monthly accumulation schedule with stacked bar chart.
For a deeper walkthrough of CDs, FDIC insurance, laddering, and CD types, see our CD Calculator Guide.
What is a Certificate of Deposit?
A certificate of deposit (CD) is a time deposit: you lend money to a bank or credit union for a fixed term and receive interest in return. Terms commonly run from three months to five years. Longer maturities often pay higher rates but lock funds longer and expose you to interest-rate risk if rates rise before maturity.
CDs sit on the low-risk, low-return end of the investment spectrum. Historically, CD yields exceeded standard savings and money market rates but stayed well below long-term stock market averages. This calculator models fixed-rate traditional CDs only — not bump-up, callable, or index-linked products.
Interest on taxable CDs is generally reported as ordinary income unless the CD is held in a tax-deferred or tax-free account such as a traditional or Roth IRA.
Periodic growth formula
For compounding n times per year over t years:
P = principal, r = annual rate, n = compounding periods per year, t = years
Continuous compounding
When compounding approaches continuous frequency:
Tax on CD interest
If interest is taxable, an estimated marginal rate reduces each period’s credited interest:
t = marginal tax rate as a decimal
APY vs APR on CDs
| Dropdown option | Rate meaning | Typical CD advertising |
|---|---|---|
| annually (APY) | Effective annual yield with compounding built in | Most bank CD rate quotes |
| monthly (APR) | Nominal annual rate compounded monthly | Some promotional disclosures |
| quarterly / semiannually | Nominal rate at that frequency | Brokered or legacy products |
| continuously | Theoretical continuous compounding | Educational comparison only |
Convert between APR and APY with our APY Calculator before comparing two bank offers.
FDIC and NCUA insurance
CDs from FDIC-insured banks are protected up to $250,000 per depositor, per insured bank, per ownership category. Deposits above that limit can be spread across institutions for full coverage. Credit union CDs are covered by NCUA insurance with similar limits. Insurance does not eliminate early-withdrawal penalties or callable CD recall risk.
Where and how to purchase CDs
CDs are sold by banks, credit unions, and brokers. Compare APY, minimum deposits, maturity dates, and penalty terms before buying. Brokered CDs may charge fees but expose you to more issuers. Buying a CD is effectively lending to the institution, which uses proceeds for lending, reserves, and operations — alongside the federal funds rate in setting offered yields.
History of CDs
Time deposits date to European banking in the 1600s, when banks paid interest to keep funds committed while lent to merchants. After the 1929 crash, the FDIC was created to stabilize banks and protect depositors. CD yields peaked near 20% during late-1970s inflation, fell through the 2000s, rose above 5% in 2023–2024 as the Fed tightened policy, and moderated again as inflation cooled in 2025–2026.
How to use CDs effectively
- Portfolio ballast — reduce volatility near retirement when predictable income matters.
- Goal-based saving — park cash for a known future date (down payment, tuition) with a fixed return.
- Rate certainty — fixed CDs make future values easy to model, unlike variable-rate accounts.
At maturity you can roll into a new CD, move funds to checking or savings, or reinvest elsewhere.
Early withdrawal
CDs are meant to stay until maturity. Early withdrawals usually trigger penalties — sometimes months of interest — unless you hold a liquid CD. In rising-rate environments, paying a penalty to reinvest at higher yields can occasionally make sense.
CD ladder strategy
A CD ladder splits cash across staggered maturities (for example 1-, 2-, and 3-year CDs). As each rung matures, you reinvest or spend — gaining periodic liquidity and the chance to capture higher rates without locking everything long term.
Types of CDs
- Traditional CD
- Fixed rate for a fixed term; jumbo CDs ($100,000+) often pay more.
- Bump-up CD
- One rate increase if market rates rise; usually starts lower than traditional CDs.
- Liquid CD
- Penalty-free withdrawals with minimum balance rules; lower yields.
- Zero-coupon CD
- Purchased at a discount; interest reinvested until maturity.
- Callable CD
- Issuer may redeem early after a call-protection period; higher starting rates compensate call risk.
- Brokered CD
- Sold through brokerage accounts with access to multiple issuers.
Alternatives to CDs
- Paying high-interest debt — guaranteed return equal to the loan rate.
- Money market accounts — FDIC-insured liquidity with competitive yields; try the MMA Calculator.
- High-yield savings — flexible access; model growth with the Savings Calculator.
- Bonds — government or corporate fixed income with different risk profiles.
- Compound growth modeling — broader deposit schedules via the Compound Interest Calculator.
Related tools
APY Calculator · Money Market Account Calculator · Savings Calculator · Compound Interest Calculator · CD Calculator Guide (blog)